Weil Mclain Boiler 550 141 850 0599 Users Manual 850/0699

GOLD DV WATER BOILER to the manual e1be36eb-17f8-48ef-86c8-8af5245d3b64

2015-02-02

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GOLD GV
Water boiler — Series 3

Boiler manual
• Installation
• Start-Up

• Maintenance
Parts

This manual must only be used by a qualified heating installer/
service technician. Failure to comply could result in severe personal
injury, death or substantial property damage.

Part No. 550-141-850/0699

GOLD GV Water boiler series 3 — manual

How it works . . .

①

Control module
The GCM control module responds to signals from the room thermostat, air pressure switch, inlet
water sensor and boiler limit circuit to operate the circulators, gas valve, igniter and blower. When
a room thermostat calls for heat, the GCM starts the system circulator and blower.
The GCM runs the blower long enough to purge the boiler flue passages, then turns on the igniter
and lets it warm up.
After a 15-second warmup, the GCM opens the gas valve, turns the igniter off, and checks for
flame. The flame must come on within 4 seconds or the GCM will shut down and try the full cycle
again.
When the room thermostat is satisfied, the GCM turns off the boiler components and waits for the
next heat call.
The GCM indicator lights show normal sequence when the lights are on steady. When a problem
occurs, the GCM flashes combinations of lights which indicate the most likely reason for the
problem.

②

Transformer

③

Blower

④

Air pressure switch

⑤

Water temperature limit switch

⑥

System circulator

⑦

Bypass circulator

The control transformer reduces line voltage to 24 volts for the gas valve and limit circuit.

The blower pulls in air and mixes it with gas from the gas valve. The blower forces this mixture into
the burner for combustion inside the boiler chamber.

The air pressure switch signals the control module, telling the control module whether air is
moving through the blower.

The water temperature limit switch turns off the gas valve if the temperature in the boiler goes
above its setting. (The circulators will continue to run as long as there is a call for heat.)

The system circulator circulates water through the external (system) piping. The flow rate of the
circulator is controlled by the GCM, depending on the temperature of the water entering the boiler
sections.

The GCM operates the bypass circulator to mix hot water from the boiler outlet with colder return
water from the system as needed to prevent condensation of flue gases in the boiler.
When the water returning to the boiler is below 130 °F, the GCM regulates the bypass circulator
and system circulator flow rates to raise the return water temperature up to 130 °F before it enters
the boiler sections. By balancing these flow rates, the GCM can protect against condensation even
if return water is as low as 60 °F.

⑧

Water temperature sensor
The water temperature sensor monitors the temperature of the water entering the boiler sections.
The sensor sends this information to the GCM. The GCM determines how much to adjust the
circulator flow rates to provide at least 130 °F entering water.

Part number 550-141-850/0699

Ž Installation • Start-Up • Parts • Maintenance

GOLD GV Water boiler — Series 3

a
b
c
d
e

supply to system
return from system
combustion air inlet fitting
flue outlet
gas valve (see warning, right)

f
g
h
i
j

Part number 550-141-850/0699

pressure/temperature gauge
flueway inspection port cover
sensor hose trap
manual air vent
relief valve

85001

This boiler uses a negative-pressureregulated gas valve, set for an outlet
pressure approximately –0.20" w.c.. DO
NOT set the outlet pressure higher than
factory setting.

GOLD GV Water boiler series 3 — manual

Please read before proceeding
Hazard definitions

The following defined terms are used throughout this manual to bring
attention to the presence of hazards of various risk levels or to important
information concerning the life of the product.

Indicates presence of hazards that will cause severe
personal injury, death or substantial property damage.
Indicates presence of hazards that can cause severe
personal injury, death or substantial property damage.
Indicates presence of hazards that will or can cause
minor personal injury or property damage.
Indicates special instructions on installation, operation
or maintenance that are important but not related to
personal injury or property damage.

Installer

Read all instructions before installing. Follow all

instructions in proper order to prevent personal injury
or death.

User

•

Also refer to GV Series 3 Venting supplements.

•

Consider piping and installation when determining boiler location.

•

Any claims for damage or shortage in shipment must be filed
immediately against the transportation company by the consignee.

•

This manual is for use only by your qualified heating installer/
service technician.

•

Please refer to the User’s information manual for your reference.

•

We recommend regular service by a qualifed service technician,
at least annually.

Table of contents
4

See pages 6 and 7 for Table of contents.
Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Please read before proceeding
Failure to adhere to the guidelines on this page can result in severe personal
injury, death or substantial property damage.

When servicing boiler —
•

To avoid electric shock, disconnect electrical supply before
performing maintenance.

•

To avoid severe burns, allow boiler to cool before performing
maintenance.

Boiler operation —
•

Do not block flow of combustion or ventilation air to boiler.

•

Should overheating occur or gas supply fail to shut off, do not
turn off or disconnect electrical supply to pump. Instead, shut off the
gas supply at a location external to the appliance.

•

Do not use this boiler if any part has been under water.

Immediately call a qualified service technician to inspect the boiler and to
replace any part of the control system and any gas control, which has
been under water.

Boiler water —
•

DO NOT use petroleum-based cleaning or sealing compounds in
boiler system. Water seal deterioration will occur, causing leakage between
sections. This can result in substantial property damage.

•

DO NOT use "homemade cures" or "boiler patent medicines".
Serious damage to boiler, personnel and/or property may result.

•

Continual fresh makeup water will reduce boiler life. Mineral
build-up in sections reduces heat transfer, overheats cast iron, and causes
section failure. Addition of oxygen and other gases can cause internal
corrosion. Leaks in boiler or piping must be repaired at once to prevent
makeup water.

•

Do not add cold water to hot boiler. Thermal shock can cause

sections to crack.

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Contents
Contents
I.

Prepare boiler location

II.

Prepare boiler

Pages

• Verify code compliance.
Check for high altitude requirements.
Provide required clearances and accessibility.
Plan vent and combustion air provisions.
Check existing common vents to be sure they will work when
old boiler is removed from system.

8 – 15

Leave boiler on its skid until preparation complete.
Install vent starter tee.
Inspect/replace if necessary the gas/air orifice.
Install high altitude kit (over 5,500 feet).
Place boiler in position.
Hydrostatically test boiler.

16 – 25

III. Water piping

Select system type from navigation table on page 26, covering baseboard systems, radiator systems, radiant heating
systems, heat pump systems, snow melt systems and water
chiller systems.
Review boiler connections pages 28 – 29, including installation of air separator and expansion tank.
Review general system information, page 30.
Obtain any system components needed but not on hand at
the job site.
Install relief valve and discharge piping.
Connect system piping.
Install low water cutoff and additional limit control, if
required.

26 – 36

IV. Venting and combustion air

Refer to Vent supplements included with boiler

Gas piping

VI. Field wiring

Summary

Connecting gas supply, including need for pipe supports.
Natural gas boilers — gas line sizing (for 0.3" w.c. drop).
Propane boilers — refer to gas supplier.

38 – 39

Code compliances.
Wiring must be N.E.C. Class 1.
Thermostat connections.
Junction box installation.
Field wiring diagram.

40 – 41

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Contents
Contents

Summary

VII. Start-up

• Determine water treatment needs, if any.
Obtain correct antifreeze if freeze protection required.
Check for gas leaks (have propane odorant verified by supplier).
Fill system and purge air.
Read Operating instructions, section IX, then start boiler.
Check all piping and verify leak-free.
Check gas valve outlet pressure (altitudes over 5,500 feet).

Pages
42 – 47

VIII.Check-out procedure

Complete checklist and fill out certificate.

48 – 49

IX. Operation

GCM (control module) indicator lights and sequence of operation.
Ladder wiring diagram (page 52).
Schematic wiring diagram (page 53).
Lighting instruction sheet — boiler with Robertshaw 7200DERN
gas valve (page 54).
Lighting instruction sheet — boiler with White-Rodgers 36E gas
valve (page 55).

50 – 55

Service/maintenance schedule table (page 57).
Detailed instructions for annual start-up and service.
Special procedures for condensate drain line check valve (page
63, if needed) and cleaning boiler heating surfaces (page 64).

56 – 65

XI. Troubleshooting

Troubleshooting procedures (page 67).
Checking air pressure switch (page 68).
Servicing tips and precautions — Igniter, gas valve and blower
housing (page 69).
Servicing tips and precautions plus indicator lights and lockout
modes of GCM (control module) (page 70).
Common problems and solutions (pages 72 and 73).
Troubleshooting based on GCM indicator lights (pages 74 – 81).

66 – 81

XII. Replacement parts

Accessory bag assembly shipped with boiler (page 83).
Section assembly parts (page 84).
Jacket assembly parts (page 86).
Blower assembly parts (page 88).
Trim assembly parts (page 90).
Interior panel parts (page 92).

82 – 93

XIII.Dimensions and ratings

Dimensional drawing and boiler rating table.

94 – 95

Service and maintenance

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Prepare boiler location — overview
Overview of this section
❏ Verify the boiler installation will meet all applicable codes.
❏ If the boiler installation is at high altitude (over 5,500 feet) make sure to
obtain and install the high altitude kit. Obtain the high altitude kit and
review the instructions included. Note the venting restrictions and input
reductions at altitudes over 5,500 feet.
❏ Check the boiler space to be sure minimum clearances and accessibility
are available.
❏ Obtain special venting materials and make sure vent will comply with
instructions.
❏ Direct vent installation (outside air piped to boiler) is optional in most
cases. But, if air contamination is likely, you will have to pipe air to the
boiler. Note list of contaminants on page 13.
❏ If the GV boiler is replacing a boiler being removed from a combined vent
system that will still serve other appliances, follow the procedure in this
manual to verify vent performance.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Prepare boiler location — codes & altitude

Installations must
follow these codes:

•

Local, state, provincial, and national codes, laws, regulations and ordinances.

•

National Fuel Gas Code, ANSI Z223.1- latest edition.

•

Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1,
when required.

•

National Electrical Code.

•

For Canada only: CAN/CGA B149.1 or B149.2 Installation Code and C.S.A. C22.1 Canadian
Electrical Code Part 1 and any local codes.

The GV boiler gas manifold and controls met safe lighting and other performance criteria when
boiler underwent tests specified in ANSI Z21.13 — latest edition.

High altitude
installations

GV boiler controls automatically reduce input with increasing altitude. See Table 1 for estimated
input at altitude as a percentage of sea level input. Multiply the boiler sea level input by this
percentage to obtain the estimated high altitude input. Note that the length of the venting system
will also have a minor impact on input. Refer to the vent supplement for further information.
No modifications to the boiler should be necessary for installations up to 5,500 feet above sea
level. For higher elevations, the air pressure switch must be changed to a special high altitude
switch. Refer to the high altitude kit instructions, manual Section IId. Note that the gas valve
outlet pressure must be checked (and adjusted if necessary) in accordance with manual Section
VIIf.
Table 1
Estimated GV input at altitude

Altitude
(feet)

% Sea level input

1,000
2,000
3,000
4,000
5,000
5,500
6,000
7,000
8,000
9,000
10,000

97
93
90
87
83
82
80
77
74
72
69

At altitudes above 5,500 feet, GV boilers can be sidewall vented only when
using direct vent (ducted combustion air). GV boilers can be vertically vented
in any of the configurations shown in the vent supplements. Refer to vent
supplements for more detail.
Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Prepare boiler location — clearances
Clearance options:

Figure 1

Large space

Large space — minimum clearances between
boiler and walls or obstructions as below; see
Section Ie for minimum combustion/ventilation
air opening sizing.

The boiler space must be at least as big as shown in
Figure 1 to qualify as a large space.
• Air openings to a large space can be per manual
Section Ie.
• The space will probably be large enough for most
service and maintenance to be done in place.

TOP VIEW
Wall

6"
min

36"

min

Wall

You can install the boiler in a space smaller than Figure 1,
but no smaller than shown in Figure 2 — this is called a
small space installation.
• Air openings to a small space must provide at least 1
square inch free area for every 1,000 Btuh of boiler
input (at least 75 sq. in. for GV-3, 105 sq. in. for GV4, 140 sq. in. for GV-5 or 175 sq. in. for GV-6). The air
opening free area must be at least this size even if the
boiler uses outside air.
• Air openings have to be within 6 inches of the floor
and 6 inches of the ceiling of the space to prevent
overheating of boiler internal components.
• Provide at least screwdriver clearance to jacket front
panel screws for removal of front panel for inspection
and minor service.
• The boiler cannot be serviced in place. Pipe the
boiler with unions and isolation valves so it can be
slid out of the space and serviced in an adjacent area.
The space has to be equipped with a door so boiler
can be accessed, unpiped and removed.
• No other appliance or air handler can be installed in
the same space or share its air supply.

Wall

Small space

Boiler
front

36"
min

Wall or obstruction

85006a

FRONT VIEW
Ceiling

36"

dripping or spraying water or
rain during operation. Allowing

these components to become wet
could cause a boiler failure, resulting
in severe personal injury, death or
substantial property damage.

Wall

Install the boiler so control system
components are protected from

Wall

min

36"

Boiler
front

min

6"
min

Floor

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 2

Flooring and foundation

Small space — installation with less clearance
than Figure 1 – BUT – no less than below; air
openings for combustion/ventilation must be
as shown below even for direct vent system.

Flooring
The GV boiler is approved for installation on combustible
flooring, but must never be installed on carpeting.

TOP VIEW
Do not install boiler on carpeting even
if foundation is used. Fire can result,
causing severe personal injury, death
or substantial property damage.

Wall

Access DOOR
with fresh air
openings

10"
min

4"
min

Boiler
top

Wall

Front

Foundation
min

1" min
Wall

Area adjacent to access door must be accessible
and must allow for removal of the GV boiler for service.
No other appliance or air mover (exhaust fan, etc.)
may be mounted in the same space.

Provide a solid brick or minimum 2-inch thick concrete
foundation pad if any of the following is true:
• floor can become flooded.
• the boiler mounting area is not level.
• high profile condensate pump is used.
(Foundation thickness will depend on height
of condensate pump inlet.) Refer to separate
Weil-McLain supplement for details.
The minimum foundation size is 16" wide by:
•
•

30¾" long for GV-3 or GV-4.
37¾" long for GV-5 or GV-6.

85006b

SIDE VIEW
Ceiling

6" max

Access door

Residential garage installation

Boiler
side

1"
min

6" max
Floor

(2) Fresh air openings —
Each with at least 1 sq. inch per 1,000 Btuh
of boiler input

Part number 550-141-850/0699

Wall

4"
min

Front

min

Precautions
Take the following special precautions when installing
the boiler in a residential garage. If the boiler is located in
a residential garage, per ANSI Z223.1, paragraph 5.1.9:
• Mount the boiler a minimum of 18 inches
above the floor of the garage to assure the
burner and ignition devices will be no less than
18 inches above the floor.
• Locate or protect the boiler so it cannot be
damaged by a moving vehicle.

GOLD GV Water boiler series 3 — manual

Prepare boiler location — vent system
Removing from existing vent
Failure to follow all instructions
following can result in flue gas
spillage and carbon monoxide
emissions, causing severe personal
injury or death.

Correct by resizing to approach the minimum size as
determined using the appropriate tables in Part 11 of
that code. Canadian installations must comply with CAN/
CGA B149.1 or B149.2 Installation Code.

GV special vent system
Vent system

When removing a boiler
from an existing common vent system:
At the time of removal of an existing boiler, the following
steps shall be followed with each appliance remaining
connected to the common venting system placed in
operation, while the other appliances remaining connected
to the common venting system are not in operation.
a. Seal any unused openings in the common
venting system.
b. Visually inspect the venting system for proper
size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
c. Test vent system — Insofar as is practical, close
all building doors and windows and all doors between
the space in which the appliances remaining
connected to the common venting system are located
and other spaces of the building. Turn on clothes
dryers and any appliance not connected to the
common venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, so they
will operate at maximum speed. Do not operate a
summer exhaust fan. Close fireplace dampers.
d. Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat
so appliance will operate continuously.
e. Test for spillage at draft hood relief opening after
5 minutes of main burner operation. Use the flame
of a match or candle, or smoke from a cigarette,
cigar, or pipe.
f. After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers, and
any other gas-burning appliance to their previous
conditions of use.
Any improper operation of common venting system
should be corrected so the installation conforms with
the National Fuel Gas Code, ANSI Z223.1 — latest edition.
12

The GV boiler requires a special vent system, designed
for pressurized venting with likelihood of condensation
in the vent. This is referred to as ANSI Z21 Class IV,
Condensing.
You may use any of the vent systems covered by the GV
venting supplements included in the instruction manual
envelope. The GV vent starter tee is a special item designed
only for the GV boiler, available from each vendor. Do
not attempt to connect the vent to the GV boiler with any
other means.
DO NOT mix components from
different systems. The vent system
could fail, causing leakage of flue
products into the living space, causing
severe personal injury or death.

Vent termination and
combustion air supply
The GV boiler may be vented through the roof or through
a side wall. Follow the appropriate vent supplement for
the vent system chosen. The maximum vent length
depends on boiler size. Refer to the vent supplement to
verify vent length will be acceptable.
Combustion air for the GV boiler may be from inside or
ducted directly to the boiler from outside. For outside air
(direct vent installation), two options are available for
the flue/air termination. The air supply must ALWAYS
terminate at the same location as the flue, using either:
1. Vertical direct vent installation. Obtain the Throughroof or through-unused chimney kit and
supplement. Find additional information in the vent
supplement for the venting material chosen.
2. Sidewall vent/air termination. This requires the WeilMcLain GV vent/air intake termination kit. Refer
to the instructions packed with the kit and the vent
supplement for the venting material chosen.
Installations above 5,500 feet altitude must be
direct vent if sidewall vented.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Prepare boiler location — contamination

Air contamination
Please review the following information on potential
combustion air contamination problems.

Refer to Table 2 for products and areas which may cause
contaminated combustion air.

If the boiler is installed in any area likely to cause contamination, or if products which
would contaminate the air cannot be removed, you must pipe combustion air to the boiler
air intake. Contaminated combustion air will damage the boiler, resulting in possible severe
personal injury, death or substantial property damage. Do not install GV boiler in a laundry
room or pool facility, for example, without using ducted outside air. These areas will always
contain contaminants.
Table 2

Corrosive contaminants

Products to avoid

Areas likely to have contaminants

Spray cans containing chloro/fluorocarbons

Dry cleaning/laundry areas and establishments

Permanent wave solutions

Swimming pools

Chlorinated waxes/cleaners

Metal fabrication plants

Chlorine-based swimming pool chemicals

Beauty shops

Calcium chloride used for thawing

Refrigeration repair shops

Sodium chloride used for water softening

Photo processing plants

Refrigerant leaks

Auto body shops

Paint or varnish removers

Plastic manufacturing plants

Hydrochloric acid/muriatic acid

Furniture refinishing areas and establishments

Cements and glues

New building construction

Antistatic fabric softeners used in clothes dryers

Remodeling areas

Chlorine-type bleaches, detergents, and cleaning
solvents found in household laundry rooms

Garages with workshops

Adhesives used to fasten building products and
other similar products

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Prepare boiler location — air openings
GV combustion air options

Single air opening option

Using inside air — non-direct vent
The GV boiler can use inside air if no contaminants are
present in the boiler space.

A single air opening within 12 inches of the ceiling may be
used where the GV boiler is installed in a large space
(clearances per Figure 1) with other appliances.
The other appliances must all be installed with at least 1
inch clearance from the sides and back, and 6 inches from
the front. The GV boiler must have minimum clearances
as shown in Figure 1.
The single air opening may be connected from outside to
the appliance space by any of the methods of Figure 3.
The free area of the opening must also be at least equal to
the combined area of all appliance vent connectors OR
sized per the following, whichever result is larger:

Using outside air — direct vent
Combustion air can be ducted directly from outside to
the GV boiler air intake fitting. The installation is defined
as direct vent (also referred to as sealed combustion).

Sizing air openings
Air openings to the GV boiler space are always required,
regardless whether combustion air is taken from inside or
outside. These air openings provide for ventilation (as
well as combustion air) to prevent overheating of the
boiler controls and boiler space. Air is also needed for
other appliances located in the same space.
Use Figure 3, cases a through d, depending on how the
air is supplied and whether the space contains only the
GV or other appliances as well. The air opening sizing of
Figure 3 is based on ANSI Z223.1, National Fuel Gas
Code, intended for natural draft appliances. The GV boiler
is not natural draft, so its requirements differ.
Air openings must be sized to handle
all appliances and air movers
(exhaust fans, etc.) using the air
supply.

Louver allowance
The free area of openings means the area after reduction
for any installed louvers or grilles. Be sure to consider
this reduction when sizing the air openings.

GV with other appliances
If the GV boiler is installed in a large space (clearances per
Figure 1) providing air for a water heater or other gas
appliance, size the air openings as follows:

GV direct vent — large shared space
Provide two openings per Figure 3, based only on the size
of the other appliances and air movers. No additional air
opening area is required for the GV boiler.
GV inside air — large shared space
If the GV combustion air comes from the inside space,
size two air openings for the total of all appliances and air
movers, including the GV boiler. Use the formula from
the appropriate case in Figure 3.
14

GV direct vent — large shared space —
single air opening
Size the single air opening for 1 square inch of free opening
for each 3,000 Btuh of all appliances other than the GV.
No additional air opening is needed for the GV.
GV inside air — large shared space —
single air opening
Size the air opening for 1 square inch of free opening for
each 3,000 Btuh of all appliances, including the GV.

GV without other appliances
If the GV boiler is installed in a space by itself, with no
other appliance or air mover using air from the space,
and with clearances around the boiler no less than those
shown in Figure 1 for large space installations:

GV direct vent — large space — alone
Air is needed only for ventilation. Size the air openings
for any of the cases of Figure 3 for a free area of at least:
1 square inch per 8,000 Btuh of GV input
for each of the two openings. (If a single opening within
12 inches of the ceiling is used, size the opening for 1
square inch of free area for each 3,000 Btuh of GV input.)
GV inside air — large space — alone
Size the air openings for any of the cases of Figure 3 for a
free area of at least:
1 square inch per 4,000 Btuh of GV input
for each of the two openings. (If a single opening within
12 inches of the ceiling is used, size the opening for 1
square inch of free area for each 3,000 Btuh of GV input.)
Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

0 to 12"

Each opening free area =
1 sq. inch per 1,000 Btuh

Add air openings
to outside if
building is tight
construction.

Other
appliances

a—

Air
opening

Air openings:
GV in space
with other
appliances

Flue

Air from inside
building

Air (direct vent)
(optional)

0 to 12"

Each opening free area =
1 sq. inch per 4,000 Btuh

Other
appliances

Air

b—

Flue

Air (direct vent)
(optional)

Air
opening

Figure 3

Motorized air dampers
If the air openings are fitted with motorized dampers,
electrically interlock the damper to:
• Prevent the boiler from firing if the damper is not
fully open.
• Shut the boiler down should the damper close during
boiler operation.
To accomplish this interlock, wire an isolated contact
(proving the damper open) in series with the thermostat
input to the boiler. The boiler will not start if this contact
is open, and will shut down should it open during
operation.

Air
opening

Tight construction
ANSI Z223.1 defines unusually tight construction where:
a. Walls and ceilings exposed to the outside atmosphere have a continuous
water vapor retarder with a rating of 1 perm or less with openings gasketed,
and . . .
b. Weatherstripping has been added on openable windows and doors, and
...
c. Caulking or sealants are applied to areas such as joints around windows
and door frames, between sole plates and floors, between wall-ceiling
joints, between wall panels, at penetrations for plumbing, electrical, and
gas lines, and in other openings.
For buildings with such construction, provide air openings into the building
from outside, sized per the appropriate case in Figure 3 if appliances are to

Exhaust fans and air movers
The appliance space must never be under a negative
pressure, even if the appliance(s) are installed as direct
vent. Always provide air openings sized not only to the
dimensions required for the firing rate of all appliances,
but also to handle the air movement rate of the exhaust
fans or air movers using air from the building or space.

Outside

Special considerations

use inside air for combustion and ventilation.

Air
opening

GV in small space (less than Fig. 1) — alone
For all vent/air situations, whether air is taken from inside or outside, provide
two openings, each with minimum free area of:
1 square inch per 1,000 Btuh of GV input.
The openings must be within 6 inches of the ceiling and 6 inches of the floor
as shown in Figure 2 for small space installations.

Air

0 to 12"

Air directly
from outside
Outside or ventilated attic

Each opening free area =
1 sq. inch per 4,000 Btuh

Other
appliances

d—
Air through
horizontal
ducts

Flue

0 to 12"

Each opening free area =
1 sq. inch per 2,000 Btuh

Air (direct vent)
(optional)

Other
appliances

Flue

Air
12"

— or —

Air (direct vent)
(optional)

GV
Air

Ventilated
crawl space

Part number 550-141-850/0699

Air
opening

Outside

Air through
vertical ducts
(or inlet air
from ventilated
crawl space)

Air
opening

85005

c—

0 to 12"

GOLD GV Water boiler series 3 — manual

IIa

Prepare boiler — overview

Overview of this ❏ Leave the boiler on its skid until installation site is ready and boiler prep is
complete per this section.
section
❏ Install vent starter tee and condensate drain line.
❏ Inspect gas/air orifice plate to verify model size and gas markings agree
with boiler and application. Install propane gas/air orifice for propane
installations.
❏ Install high altitude kit for altitudes more than 5500 feet above sea level.
❏ Place boiler in position and install jacket rear panel.
❏ Plug openings and hydrostatically test boiler. Remove plugs.

IIb

Prepare boiler — vent starter tee & drain

Install vent starter
tee and condensate
drain hose

Use only the vent starter tee of the same manufacturer as the
vent components to be used. Do not mix components from different
systems. The vent system could fail, causing flue gas spillage, resulting in
severe personal injury or death.

Install vent starter tee as shown in Figure 4.
1. Remove jacket access panel (item 1). You can rotate the plate out of the way, leaving the air
hose connected to the air intake fitting, or loosen the hose clamp (item 2) and pull the air hose
off of the fitting as shown in Figure 4.
2. Remove the hex nuts (item 5) from the vent starter tee studs at the boiler vent connection.
3. Remove the vent starter tee gasket (item 4) from the studs.
4. Clean the surface of the boiler flue connection to assure a good seal. Use emery cloth if
necessary to remove any accumulated rust.
5. Place the vent starter tee gasket (item 4) over the studs.
6. Slide the holes in the vent starter tee flange (item 3) over the studs.
7. Apply the (4) hex nuts (item 5), align the vent starter tee (item 3) and tighten the nuts
uniformly.
Install condensate trap hose as shown in Figure 4.
1. Loosen and slide a spring hose clamp (item 8) over each end of the condensate drain hose
(item 6).
2. Loosen the clamp and slide one end of the hose over the CPVC drain elbow (item 7). Slide
clamp into position and release.
3. Attach and clamp the other end of the hose to the drain connection on the bottom of the vent
starter tee (item 3).
Replace jacket access panel (item 1), reconnecting the air hose to the air intake fitting if necessary.
16

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

IIb
Figure 4

Prepare boiler — vent starter tee & drain (cont.)
Install vent starter tee and
condensate drain hose before
placing boiler.

Screw hole
and notch, located
in base rail under
vent outlet

Base rail

Insert CPVC elbow
into bracket. Then
attach bracket to
base rail with screw
as shown at left.
10-32 x 3/8"

Vent starter tee — not included
with boiler. See information
below.

The vent starter tee is NOT supplied with the boiler. Obtain this
part as a separate purchase from your Weil-McLain wholesaler.

85002

Part number 550-141-850/0699

The vent starter tee shown is for Saf-T Vent®. Use only the vent tee
made for the vent system you are using. DO NOT mix different
brands of vent system components. The vent system could fail to
operate properly, causing leakage of flue products into the living
space, resulting in severe personal injury or death.

GOLD GV Water boiler series 3 — manual

IIc

Prepare boiler — orifice plate

The correct orifice plate must be used. Failure to do so will result in severe
Check for correct
personal injury, death or substantial property damage.
orifice plate and
replace if necessary Natural gas:
For natural gas installations, inspect the silver gas/air orifice plate marking. It must be
the same as the boiler size. If the orifice plate is stamped with another size, obtain the correct plate
from your wholesaler. The boiler size is stamped where the “X” is shown in the plate stamping,
Figure 5b.

Propane:
For propane installations, replace the silver gas/air orifice plate with the red/white
plate, per following instructions. Ensure the red/white plate boiler size is correct for the GV
boiler being installed. The boiler size is stamped where the “X” is shown in the plate stamping,
Figure 5b.
Also fill out the propane label in the conversion kit and attach to the left side of the jacket, above
the gas inlet opening, as shown in Figure 5a.

Plate installation
Access the bottom of the blower housing as shown in Figure 5a.
To inspect the plate only, read the marking on the plate edge. It must read the same as the
boiler size and fuel.
To replace the plate, using a manual screwdriver or nut driver, see Figure 5b:
1. Loosen screws 1 and 2 two full turns.
2. Remove screws 3 and 4.
3. Pull the gas/air orifice plate forward to remove it.
4. Slide in the new plate as shown in Figure 5b. The red side of a propane plate must go
next to the blower housing as shown.
5. Replace screws 3 and 4. Tighten all four screws securely and uniformly. DO NOT overtighten.
DO NOT exceed 40 inch-pounds torque.
6. Bend down plate label tab at score mark as shown in lower right corner of Figure 5b.
Remove jacket front panel to access the bottom
side of the blower housing.

Figure 5a
Check for correct orifice plate
and replace if necessary.

Complete the propane conversion label included
with the conversion kit. Install label on jacket left
side, as shown.

Leave boiler on its back, on
the skid, until inspection/
replacement is completed.

85004a

Leave the boiler on its back, on the skid as
shown, until you have checked the gas/air orifice
plate and replace it if necessary.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 5b

Checking and replacing gas/air orifice plate. For propane
installations, replace silver plate with red/white propane plate.
DO NOT use electric or
pneumatic screwdrivers to

remove or tighten the gas/air boss
screws. Hand-tighten only, using
manual screwdriver. Should the
torque exceed 40 inch-pounds, the

threaded holes could strip out, causing
an inadequate seal of the orifice plate.
Failure to properly seal the plate to
the housing could result in a gas leak,
causing severe personal injury, death
or substantial property damage.

White side (propane plate)
Warning label side (natural gas)
(Install with this side
toward air inlet hose)

Gas/air manifold

Bottom side of boiler front section
GVX PROP
GV
XP
RO
P

Propane — red side

Natural — plain side

Install plate with red side (propane) or plain side
(natural) against the blower housing.

Part number 550-141-850/0699

Orifice plate after bending along
score mark. This makes the plate
identification readable after
installation.
85004b

GOLD GV Water boiler series 3 — manual

IId

Prepare boiler — high altitude kit
Obtain high altitude When required
kit For installations at altitude more

than 5,500 feet
above sea level, a special high altitude air pressure

switch is required. In addition, the gas valve outlet
pressure setting must be checked, and adjusted if
necessary, per the instructions in manual Section VIIf,
altitude over 5,500 feet.
Obtain the GV high altitude kit from your local WeilMcLain distributor. This kit includes the high altitude air
pressure switch and a special tool needed for accessing
the adjusting screw on some gas valves. The kit also
includes tubing fittings as described in manual.

Install high altitude
air pressure switch

1. See Figure 5c (switch shown with wires removed).
2. Remove the two (RED) control wires from the air
pressure switch spade terminals.
3. Remove the factory-installed air pressure switch
(loosen top screw and remove bottom screw holding
switch to jacket interior panel).
4. Install the high altitude air pressure switch in the same
location.
5. Carefully replace the hoses on the new switch, with
the red hose on the hose barb closest to the interior
panel, as shown in Figure 5c. The white hose goes
on the outer hose barb.
6. Replace the two (RED) control wires on the new
pressure switch spade terminals.

Check gas valve
outlet pressure

After following the start-up procedures of manual Section
VII, follow the procedures of Section VIIf to measure gas
valve outlet pressure and adjust if necessary.
Failure to check gas valve
outlet pressure and adjust, if

necessary, could result in severe
personal injury, death or substantial
property damage. Carefully follow
the guidelines given in this manual.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

— altitudes above 5,500 feet ONLY
Figure 5c

Air pressure switch mounting and sensor hoses

Jacket left
side panel

White
hose

Red
hose

Interior panel
(2) 10-32 x 3/8"
Phillips/hex screws

Boiler top

85052

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

IIe

Prepare boiler — place in position
Position boiler

After installing vent starter tee, inspecting (replacing if
necessary) the gas/air orifice and installing the high
altitude kit (if required), move the boiler near its position.
Figure 6 shows the boiler with the front and top panels
replaced. These panels may be left off if desired until the
installation has been completed.
Refer to Figure 6 for placement sequence:

➀

Wearing heavy gloves, carefully rotate the boiler

over onto its base rail legs.

➁

Clip the shipping strap securing the skid to the

boiler block assembly. Remove the skid and strap.

➂

Attach the jacket rear panel as shown using (4)
#10 x ¾" screws provided in the accessory bag.

Boiler is heavy and contains some
sheet metal parts which may have
sharp edges. Wear gloves when
handling and take proper precautions
when moving. Failure to do so will
result in severe personal injury, death
or substantial property damage.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 6

Rotating boiler into position, removing skid and installing jacket rear panel

Carefully rotate
boiler onto base
rail legs as shown

ROTATE

Install jacket
rear panel
with (4) screws,
#10 x 3/8"

Clip shipping
strap
Part number 550-141-850/0699

85003

GOLD GV Water boiler series 3 — manual

IIf

Prepare boiler — pressure test
Perform hydrostatic pressure
test

5. Slowly reopen drain valve (item 2) until test pressure
of not more than 45 psi is reached on the pressure
gauge.

Pressure test boiler before attaching water or gas piping
(except as noted below) or electrical supply.

6. Test at no more than 45 psi for no more than 10
minutes.

Prepare boiler for test (Fig. 7)

Do not leave boiler unattended.

➀

Connect a hose from water supply to fill and drain
boiler for hydrostatic test. Hose is not included with
boiler.

➁

A cold water fill could expand and
cause excessive pressure, resulting in
severe personal injury, death or
substantial property damage.

Connect hose to boiler drain valve. Make sure hose
can also be used to drain boiler after test.

➂

Remove 1" nipple, 1" tee, bushing and pressure/
temperature gauge from accessory bag. Pipe to boiler
supply connection as shown. Use pipe dope sparingly.

➃

Connect a nipple and shutoff valve to system supply
connection on the 1" tee. This valve will be used to
bleed air during the fill. Valve and nipple are not
included with boiler.

➄

Connect a nipple and shutoff valve to system return
connection at circulator flange. This valve will be used
to bleed air during the fill. Valve and nipple are not
included with boiler.

➅

Install a ¾" pipe plug in the relief valve opening, top
of the rear boiler section, as shown. Plug is not
included with boiler.

7. Make sure constant gauge pressure has been
maintained throughout test. Check for leaks. Repair
if found.
Leaks must be repaired at once.

Failure to do so can damage boiler,
resulting in substantial property
damage.
Do not use petroleum-based
cleaning or sealing compounds in
boiler system. Severe damage to
boiler will occur, resulting in
substantial property damage.

Drain and remove fittings

Fill and pressure test

1. Disconnect fill water hose from water source.

1. Connect fill water supply through drain valve (item
2).

2. Drain boiler at drain valve or out hose, whichever
provides best access to drain. Close drain valve and
remove hose after draining.

2. Fill boiler with water (be sure bleed valves at 4 and 5
are open).
3. When water flows from bleed valves, shut off water
at drain valve.

3. Remove nipples and valves at 4 and 5 unless they
will remain for use in the system piping.
4. Remove plug (item 6) from relief valve tapping.

4. Close bleed valves.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 7

Piping connections for hydrostatic test

To fill/drain
85007

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

IIIa

Water piping — overview

Overview of this ❏ Select suggested piping from the following table, based on the type of
system in which you are installing the GV boiler.
section
❏ Review boiler connections, pages 28 – 29 — information on supply and
return connections at boiler and key system components (air separator
and expansion tank).
❏ Review page 30, information applying to all systems.
❏ Obtain any system components needed but not on hand or available at
jobsite.
❏ Install boiler relief valve and pipe discharge to a safe location per guidelines
in this section.
❏ Install system piping and boiler connections.
❏ Install additional limit control (if required for code compliance) and low
water cutoff if required.

For heating system with . . .

See pages 27 – 30 and . . .

Baseboard, finned tube or cast iron

Radiators, cast iron

Radiant floor, wall or ceiling — single zone (note 1)

Radiant floor, wall or ceiling — multiple zones

Heat pump (note 1)

Snow melt plus space heating

Control valve (note 2)

Water chiller

Note 1: Install a temperature limit control in the supply piping to protect the system.
Note 2: Apply these piping designs for outdoor reset or any system requiring automatic
supply temperature regulation.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

IIIb
Install relief valve

Water piping — relief valve
Refer to Figure 8 for location of the relief valve on the boiler.
Install the relief with the spindle vertical in the ¾" tapping on top left of the back section, as
shown.
To avoid water damage or scalding due to valve operation, a metal discharge
line must be connected to relief valve outlet and run to a safe place of
disposal. Terminate the discharge line to eliminate possibility of severe burns
should the valve discharge.
Discharge line must be as short as possible and be the same size as the
valve discharge connection throughout its entire length.
Discharge line must pitch downward from the valve and terminate at least
6" above the floor drain where any discharge will be clearly visible.
The discharge line shall terminate plain, not threaded, and must be
rigid metallic pipe of material suitable for temperatures of 375 °F or greater.
Do not pipe the discharge to any place where freezing could occur.
No shutoff valve shall be installed between the relief valve and boiler, or in

the discharge line. Do not plug or place any obstruction in the discharge line.
Failure to comply with the above guidelines could result in failure of the

relief valve to operate, resulting in possibility of severe personal injury, death
or substantial property damage.
Test the operation of the valve after filling and pressurizing system by
lifting the lever. Make sure the valve discharges freely. If the valve fails to
operate correctly, replace it with a new relief valve.

Figure 8

Jacket plug for unused relief valve jacket
opening.

Jackets are provided with two relief valve
openings because each jacket size is used
for two boiler sizes. Cover the unused
opening with the plug provided.

Boiler relief valve (from accessory bag)

¾" x 3" nipple, provided in accessory bag

¾" relief valve tapping in back section

Connect minimum ¾" discharge piping
to relief valve.
See WARNING above.

Install and pipe relief valve

85008

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

IIIc

Water piping — boiler connections
Supply & return connections
Always connect supply and return connections to the
boiler as shown in Figure 9. (Note in the following and in
the suggested piping drawings in this manual that the
expansion tank and air separator location will depend on
the system piping.)

Operating pressure of system, after
temperature expansion above cold fill
pressure, should not exceed 24 PSIG
to avoid weeping of relief valve.
Install an automatic air vent on top of the air separator,
per separator manufacturer’s instructions.
Closed-type expansion tank:

Air separator
Install an air separator in the piping as shown. For
single-zone systems, install the air separator in the return
piping as shown in Figure 9. This allows mounting the
automatic air vent and expansion tank off of the separator.

Expansion tank
Figures 9 and 10 show typical installation of the
expansion tank when the boiler is connected to a zonevalve zoned baseboard system (see Figure 10). Always
locate the air separator and expansion tank as shown in
the suggested piping drawings, Figures 10 through 16.
Ensure that the expansion tank size will handle boiler and
system water volume and temperature. See tank
manufacturer’s instructions and ratings for details.
Additional tanks may be added to the system if needed to
handle the expansion. These tanks may be installed by
connecting to tees in the system piping.
Undersized expansion tanks

cause system water to be lost from
the relief valve and makeup water to
be added through the fill valve.
Eventual section failure can result.
Always locate the cold water fill
connection at the expansion tank.
Never locate this elsewhere in the
system.
Diaphragm- or bladder-type tank:

Refer to Figure 9 for suggested piping when using a
diaphragm- or bladder-type expansion tank.

Figure 10 shows suggested piping when using a closedtype expansion tank, in which the air is directly in contact
with tank water.
Connect piping (½" or ¾") from the air separator top
outlet to the tank fitting. Slope any horizontal piping a
minimum of 1 inch per 5 feet of horizontal pipe.
Always use a tank fitting, such as the B&G Tanktrol or
Taco Taco-Trol (shown). The fitting reduces gravity flow
of water in the piping to the tank, avoids air bubbling
through the tank water, and provides the proper fill height
in the tank.
Correct all leaks in the system or

tank piping. Leaks allow air to escape
from the system and will cause waterlogging of the tank. This will result in
water loss through the boiler relief
valve due to over-pressurization.
NEVER use an automatic air vent in

a system equipped with a closed-type
expansion tank. The air removed
from the system will cause waterlogging of the expansion tank.
Closed-type expansion tank —

Follow tank manufacturer’s
instructions for filling the tank.
Typical tank sizing provides for
approximately 12 PSIG when the
tank is filled to the normal level and
system water is cold. Note that boiler
relief valve is set for 30 PSIG.
Operating pressure of system, after
temperature expansion above cold fill
pressure, should not exceed 24 PSIG
to avoid weeping of relief valve.

Diaphragm- or bladder-type
expansion tank — Control fill
pressure with the tank air charge

Backflow preventer

pressure. Always check pressure and
charge tank with tank removed from
system to be sure reading is accurate.
Boiler relief valve is set for 30 PSIG.

Where required by codes, install a backflow preventer
in the cold water fill line, as shown in suggested piping
diagrams on following pages. Install a check valve if a
backflow preventer is not installed.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 9

Piping to single-zone system using diaphragm- or bladder-type
expansion tank. Boiler connections are 1" NPT (supply from 1" tee,
return to 1" system circulator flange).

Relief valve discharge piping — see page 27
Boiler isolation valves
3 Fill valve
4 Air separator
5 Automatic air vent

Figure 10

Piping closedtype expansion
tank

Backflow preventer or check valve
System supply piping
8 System return piping
9 Diaphragm-type expansion tank —
always locate as shown in the suggested
piping drawings, Figures 10 through 16

To cold fill

85011

10 Pressure reducing valve
11 Quick-fill bypass valve
12 Closed-type expansion tank —

85010

Locate the air separator as shown in the suggested piping
diagram, Figures 11 through 16 on the following pages.
Pipe diaphragm- or bladder-type expansion tanks to the
bottom of the separator.
Part number 550-141-850/0699

always locate as shown in the
suggested piping drawings,
Figures 10 through 16
13 Tank fitting

Pipe closed-type (air in contact with water) tanks to the
top of the air separator. Always connect the fill line to the
expansion tank location, as shown above and in the
suggested piping.
29

GOLD GV Water boiler series 3 — manual

IIId
Zoning with
circulators

Water piping — all systems
The GV internal system circulator cannot be removed
from the boiler for use as one of the zone circulators. It
must remain as shipped from the factory to allow proper
flow control inside the boiler. You will need a circulator
for each zone.
Size the common (primary) pipe for the combined flow
of all circulators, or with a pipe cross-sectional area at
least equal to the total areas of all zone supply pipes. You
may also use the alternative sizing chart at right, based
on maximum flow of 10 gmp per circulator.
Install and wire a separate relay for each zone circulator.

Zoning with
zone valves

Alternate primary
manifold sizing
(max 10 gpm per circulator)

Number of
circulators

Suggested
pipe size

2–3

1½"

4–5

6–8

2½"

9 – 12

Each zone in the piping diagrams in this section is shown with an isolation valve on each side.
Substitute a memory-stop valve for one of these in each zone in order to use the memory-stop
valve for balancing flow as well as isolation.
Provide a separate 24-volt transformer to power the zone valves. Size the transformer to handle
the total rated load of all connected zone valves.

Additional
components

If installation is to comply with ASME or Canadian requirements, an additional high
temperature limit is needed.
• Purchase and install in system supply piping between boiler and isolation valve.
• Wire the second limit control in series with the boiler limit control.
• Set the second limit control at least 20 °F above the boiler limit control setting (maximum
setting 240 °F).
A low water cutoff device is required when boiler is installed above radiation level or by
certain state or local codes or insurance companies. Use low water cutoff designed for water
installations. Electrode probe-type is recommended. Purchase and install in tee in supply piping
above boiler.

If boiler is connected to heating coils located in air handling units where they
can be exposed to refrigerated air, use flow control valves or other automatic
means to prevent gravity circulation during cooling cycle. Circulation of cold
water through the boiler could result in damage to the heat exchanger, causing
possible severe personal injury, death or substantial property damage.
Do not remove either of the GV internal pumps for use elsewhere in the
system. Both pumps are required for proper operation. Removing a pump
will cause the boiler to malfunction. Substantial property damage could result.
Never install another pump in series with the GV boiler. Forced
flow can cause improper operation of the boiler controls. Substantial property
damage could result.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

IIIe

Water piping — baseboard system
Figure 11a

Baseboard system (finned tube or
cast iron) — zone valve zoning

Baseboard system piping
Apply Figure 11a (zone-valve zoning) or 11b (circulator
zoning) to systems using baseboard heaters. The heaters
can be any baseboard style, including finned tube or cast
iron.

Zone 2

Zone 1

The boiler internal “System circulator” can be used to
circulate most zone-valve zoned systems as shown in
Figure 11a. For systems requiring higher flow, apply the
suggested piping of Figure 12a.
The boiler internal circulators must be left in the boiler.
They cannot be removed for use a a zoning circulator.
Provide a circulator for each zone when circulator zoning,
and pipe the system as in Figure 11b.

Cold water fill

GV Boiler

85013a

Figure 11b Baseboard system (finned tube or
cast iron) — circulator zoning

Legend
1 Boiler isolation valves

Zone 2

2 Automatic air vent (with diaphragm-type
expansion tank), or connect to tank fitting
(closed-type expansion tank).

Zone 1

3 Diaphragm- or bladder-type expansion tank, if
used. (For closed-type expansion tank, pipe
from top of air separator to tank fitting as in
Figure 10.)

12"
max
Cold
water
fill

4 Zone valve
5 Zone circulator
6 Flow/check valve
GV Boiler

7 Hose bibb purge valve
85017

Part number 550-141-850/0699

8 Boiler pressure/temperature gauge
31

GOLD GV Water boiler series 3 — manual

IIIf

Water piping — radiator system
Figure 12a

Radiator system — zone-valve
zoning

Radiator system piping
Apply Figure 12a (zone-valve zoning) or 12b (circulator
zoning) to systems using standing cast iron radiators.
This applies to gravity water systems and converted steam
systems using columnar, tubular or recessed cast iron
radiators.

Zone 2

Zone 1

The suggested piping for zone-valve zoning radiator
systems differs from baseboard systems because of the
high water content of cast iron radiators. The GV internal
circulators automatically regulate supply and internal
bypass flow based on the temperature of the water
returning to the boiler. At the start of many heating cycles
in a radiator system, the water in the radiators is cool. So
the boiler would slow down system flow rate while
sending out relatively hot water. This could cause heat
distribution problems. Install a separate system circulator
as shown in Figure 12a when zoning with zone valves.
The separate circulator assures a relatively constant
temperature drop through the system.

12"
max
Cold
water
fill

GV Boiler

85013b

Figure 12b Radiator system — circulator
zoning

The boiler internal circulators must be left in the boiler.
They cannot be removed for use a a zoning circulator.
Provide a circulator for each zone when circulator zoning,
and pipe the system as in Figure 12b.

Legend
1 Boiler isolation valves

Zone 2

2 Automatic air vent (with diaphragm-type
expansion tank), or connect to tank fitting
(closed-type expansion tank).

Zone 1

3 Diaphragm- or bladder-type expansion tank, if
used. (For closed-type expansion tank, pipe
from top of air separator to tank fitting as in
Figure 10.)

12"
max
Cold
water
fill

4 Zone valve
5 System or zone circulator
6 Flow/check valve
GV Boiler

7 Hose bibb purge valve
85017

8 Boiler pressure/temperature gauge
Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

IIIg

Water piping — single-zone radiant or heat pump system
Single-zone radiant heating or heat pump
piping

You may also apply the suggested piping of either Figure
14a or 14b if you want automatic supply temperature
regulation or outdoor reset temperature control.

Radiant heating systems and heat pump systems usually
require system supply water temperatures below 130 °F.
But the boiler outlet water temperature will be at least
150 °F during most operating conditions. So the piping
must include a method of reducing the supply water
temperature to the system.

For additional information and alternatives in piping
for radiant heating systems, refer to Weil-McLain
AlumiPex Controls • Pumps • Wiring Design
Guide.

Figure 13 uses two balancing valves to manually adjust
the supply water temperature. Follow the instructions
below to adjust these valves. Install the supply
temperature limit control (item 14) as shown to protect
the system from overtemperature conditions. Note also
that this piping requires a separate system circulator, as
shown, because of the higher flow rates of radiant and
heat pump systems.

Adjust balancing valves

Manual adjustment of the supply temperature is limited
to single-zone systems because multi-zone systems will
cause varying loads, making it unlikely an acceptable valve
setting could be found. See Figure 14a or 14b for multizone systems.

Figure 13

Single-zone radiant heating or
heat pump system

Use valves 15 and 16 to mix boiler supply water with
system return water, reducing supply water temperature
to the system.
1. Subtract the design system supply temperature from
150 °F. Call this number the temperature
difference.
2. Open valve 16 and close valve 15.
3. Start the boiler and system.
4. Let the system warm up for about 15 minutes.
5. Note the temperature at gauge 9 (system supply)
and gauge 8 (boiler supply).
6. Slowly close valve 16 while opening valve 15 until
gauge 9 reads lower than gauge 8 by at least the
temperature difference found in step 1.
7. Example: For a design supply temperature of 100 °F,
the temperature difference would be 150 °F
minus 100 °F, or 50 °F. Set the valves until gauge 9
reads at least 50 °F lower than gauge 8.

Load

Legend

12"
max
Cold
water
fill

GV Boiler

85015a

Part number 550-141-850/0699

1 Boiler isolation valves
2 Automatic air vent (with diaphragm-type
expansion tank), or connect to tank fitting
(closed-type expansion tank).
3 Diaphragm- or bladder-type expansion tank, if
used (For closed-type expansion tank, pipe
from top of air separator to tank fitting as in
Figure 10.)
5 System circulator
7 Hose bibb purge valve
8 Boiler pressure/temperature gauge
9 System supply temperature gauge
10 Return temperature gauge
14 Supply temperature limit control — Set at a
temperature below the maximum allowed for
the system or as directed by the system
designer.
15 Balancing valve
16 Balancing valve
33

GOLD GV Water boiler series 3 — manual

IIIh

Water piping — multi-zone radiant system
Figure 14a

Manual bypass; fixed temp
operation only
Zone 2

Multi-zone radiant heating
system piping
Multi-zone systems require automatic regulation of the
system supply temperature because of widely varying
load conditions. Figure 14a (zone-valve zoning) and
Figure 14b (circulator zoning) show suggested piping
for these systems.

Zone 1

Select an automatic temperature control valve or motoroperated valve which can be adjusted for the desired
supply water temperature.
Zone-valve zoning — The suggested piping uses a separate
circulator for system circulation to provide the higher
flow typical of radiant heating systems and to assure
good temperature distribution in the system when the
return water temperature is low.

Cold
water
fill
12"
max

Circulator zoning — The GV internal circulators must
not be removed. Provide a separate circulator for each
zone.
GV Boiler

Outdoor reset control
85015b

Figure 14b Auto return temp regulation;
outdoor reset or fixed temp
Zone 2

Apply Figure 14a or 14b for any system intended for
outdoor reset of the supply water temperature. Use a
motor-operated three-way valve and an outdoor reset
temperature control system.

Legend
1 Boiler isolation valves

Zone 1

2 Automatic air vent (with diaphragm-type
expansion tank), or connect to tank fitting
(closed-type expansion tank).
3 Diaphragm- or bladder-type expansion tank, if
used (For closed-type expansion tank, pipe
from top of air separator to tank fitting as in
Figure 10.)

Cold
water
fill

4 Zone valve

12"
max

5 System or zone circulator
6 Flow/check valve
7 Hose bibb purge valve
8 Boiler pressure/temperature gauge
9 System supply temperature gauge

GV Boiler

10 Boiler return temperature gauge
85018b

13 Supply temperature automatic mixing valve
Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

IIIi

Water piping — snow melt system
Figure 15a

Manual bypass valves; for fixed
temp operation only
Snow melt
heat exchanger

Piping snow melt systems or
combination snow melt/
space heating systems
Combination snow melt/space heating systems will have
widely varying system return temperatures. So these
systems require automatic return water temperature as
shown in Figure 15a (zone-valve zoning) or Figure 15b
(circulator zoning).

Heating zone(s)

Select an automatic temperature control valve or motoroperated valve which can be adjusted to provide a return
water temperature of at least 60 °F. Any setting higher
than 60 °F will also be acceptable.

12"
max

Cold
water
fill

Zone-valve zoning — The suggested piping uses a separate
circulator for system circulation to assure good
temperature distribution in the system when the return
water temperature is low.
Circulator zoning — The GV internal circulators must
not be removed. Provide a separate circulator for each
zone.
GV Boiler

The return water temperature to the
boiler must be at least 60 °F. Provide
and apply means to regulate the
return temperature. Failure to do so
can result in boiler control operation
problems, causing possible
significant property damage.

85014b

Figure 15b Auto return temp regulation; for
outdoor reset or fixed temp
Snow melt
heat exchanger

Legend
Heating zone(s)

1 Boiler isolation valves
2 Automatic air vent (with diaphragm-type
expansion tank), or connect to tank fitting
(closed-type expansion tank).

12"
max

3 Diaphragm- or bladder-type expansion tank, if
used (For closed-type expansion tank, pipe
from top of air separator to tank fitting as in
Figure 10.)

Cold
water
fill

4 Zone valve
5 System or zone circulator
6 Flow/check valve
7 Hose bibb purge valve
8 Boiler pressure/temperature gauge

GV Boiler

9 System supply temperature gauge
85016

Part number 550-141-850/0699

12 Return temperature automatic mixing valve
35

GOLD GV Water boiler series 3 — manual

IIIj

Water piping — water chiller systems
Water chiller systems

Figure 16

Installing GV boiler in system with
water chiller

Pipe the boiler and water chiller as shown in Figure
16.

Expansion tank
12"
max

Balancing
valve

Install boiler, as shown, so chilled medium is piped
in parallel with heating boiler. Use appropriate valves
to prevent chilled medium from entering boiler. See
Figure 16 for typical installation of balancing valve
and check valve.

Fill

Pump

System
supply
shutoff
valve

Flow/check
valve

Install the flow/check valve in the boiler supply piping,
as shown in Figure 16, to prevent gravity circulation
during the cooling cycle.

Water
chiller

shutoff
valves

Strainer

Boiler

Check
valve
shutoff
valve

System
return

85012

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Venting and combustion air
GV boiler must be vented and supplied with combustion and
ventilation air as described in GV Series 3 Venting supplements packed
in envelope assembly with boiler. Failure to do so will cause severe personal
injury or death.
Install vent piping and air piping (if used) per appropriate Vent supplement included in boiler
envelope assembly.
Refer to Vent supplement and to manual Section I regarding requirements for:
•

vent system

•

combustion air openings

•

combustion air quality

Use direct vent (sealed combustion) if combustion air quality cannot
be assured to be free of contaminants. Refer to page 13 for a list of
potential contaminants and locations likely to contain them. Operating the
boiler with contaminated air will damage the boiler sections and vent, resulting
in possible boiler failure or leakage of flue products, causing severe personal
injury, death or substantial property damage.

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Gas piping
Connecting gas supply piping to boiler
Do not connect gas supply to boiler
or attempt to operate boiler unless
the correct orifice plate has been
verified or installed in accordance
with manual Section IIc.
Except where otherwise
instructed in this manual, do
not attempt to measure or
adjust the outlet pressure
setting of the gas valve. The gas

valve is factory set to a slight negative
pressure, and is operated as a
negative-pressure regulated valve.
Failure to comply will result in
malfunction of the boiler, causing
severe personal injury, death or
substantial property damage.

Failure to apply pipe dope as

detailed above can result in severe
personal injury, death or substantial
property damage.

Natural Gas:
1. Refer to Table 3 for pipe length and diameter. Size gas
supply piping for total flow to all connected
appliances. For each GV boiler, provide for the
following gas flow (cfh = cubic feet per hour):
GV-3

70 cfh

GV-5

140 cfh

GV-4

105 cfh

GV-6

175 cfh

1. Refer to Figure 17 to connect gas supply to ½" npt
boiler gas connection. Use wrench to hold factoryinstalled gas piping nipple.

Table 3 is only for gas of specific gravity 0.60 at

2. Support piping with hangers, not by boiler or its
accessories.

refer to ANSI Z223.1 (or CAN/CGA B149.1 orB149.2
for Canadian installations).

3. Purge all air from gas supply piping.
4. Before placing boiler in operation, check boiler and
its gas connection for leaks.
Do not check for gas leaks with
an open flame — use bubble test.

Failure to use bubble test or check
for gas leaks can cause severe
personal injury, death or substantial
property damage.

5. Use pipe dope compatible with propane
gases. Apply sparingly only to male threads of pipe
joints so that pipe dope does not block gas flow.

a pressure drop through the line of
0.3" w.c..For additional gas pipe sizing information,

2. Inlet pressure required at gas valve inlet:
maximum 13" w.c. minimum 4" w.c.
3. Install 100% lockup gas pressure regulator in supply
line if inlet pressure exceeds 13" w.c. Adjust
for 13" w.c. maximum.

Propane Gas:
1. Contact gas supplier to size pipes, tanks and 100%
lockup gas pressure regulator.

a. Close manual main shutoff valve during
any pressure testing at less than 13" w.c.

2. Adjust propane supply regulator provided by gas
supplier for 13" w.c. maximum pressure.

b. Disconnect boiler and gas valve from
gas supply piping during any pressure
testing greater than 13" w.c.

3. Inlet pressure required at gas valve inlet:
maximum 13" w.c.

minimum 4" w.c.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Always use a wrench on the manifold to
prevent it from twisting when installing or
removing external gas piping. Failure to do
so could damage the blower housing
assembly, resulting in a leakage of

Service
valve
(by others)

Figure 17

Gas supply connection to GV
boiler gas manifold

Table 3

Pipe capacity for 0.60 specific
gravity natural gas

Ground joint
union
(by others)

½" NPT
Blower housing
cover

Manifold

Gas valve
Drip leg
(by others)

Nipple length must provide
at least 3 inches between
the cap and tee, per ANSI
Z223.1.
Outlet hex
fitting

Gas valve outlet hex fitting is a LEFTHAND thread.

85031

Capacity of pipe for pipe size of:
(Capacity in cubic feet gas per hour)

Gas pipe
length
(feet)

½"

¾"

1¼"

1½"

10
20
30
40
50
75
100
150

132
92
73
63
56
45
38
31

278
190
152
130
115
93
79
64

520
350
285
245
215
175
150
120

1050
730
590
500
440
360
305
250

1600
1100
860
760
670
545
460
380

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Field wiring
Electrical installation must
comply with:
National Electrical Code and any other national, state,
provincial or local codes or regulations.
In Canada, C.S.A. C22.1 Canadian Electrical Code Part
1, and any local codes.
Wiring must be N.E.C. Class 1.
If original wiring as supplied with boiler must be replaced,
use only type 90 °C wire or equivalent.
Boiler must be electrically grounded as required by
National Electrical Code ANSI/NFPA 70-latest edition.

Wiring connections
Thermostat(s)
Install on inside wall away from influences of drafts, hot
or cold water pipes, lighting fixtures, television, sunrays,
or fireplaces.
Follow instructions with thermostat. If it has a heat
anticipator, set heat anticipator in thermostat to match
power requirements of equipment connected to it (ignition
control and gas valve, zone valve contacts, etc.). Wiring
diagram on boiler gives setting for standard equipment
(ignition control and gas valve).
Thermostat wires are labeled "T-T" on boiler. Remove
label before connecting as shown in Figure 18. Route this
wiring through the hole in the upper left side jacket.
For zoned systems, substitute the zone valve end switches
or circulator relay contacts for the thermostat contact
shown in Figure 18.

When using three-wire zone valves,
take care to avoid miswiring.
This can impose an additional 24
volts across the boiler control
circuitry. The boiler control module
will sense this problem and lockout.
It will flash the POWER and TSTAT
CIRC lights to indicate the problem.
See label on control module for
explanation of lockout conditions. To
verify before connecting to boiler,
disconnect field thermostat wires at
boiler. Place a voltmeter across the
leads. Then watch the voltmeter as
each zone is activated (by activating
zone thermostat). There should never
be a voltage reading across the two
leads coming to the boiler. If you see
a voltage reading, one or more zone
valves is miswired.

Junction Box (furnished)
Mount the 2 x 4 junction box on the left side of the boiler
as shown on page 3 of this manual and in other
illustrations.
Fused disconnect or service switch (15 amp.
recommended) may be mounted on this box. For those
installations with local codes which prohibit installation
of fused disconnect or service switch on boiler, install a
2 x 4 cover plate on the boiler junction box and mount
the service switch remotely as required by the code.
Connect 120 VAC power wiring as shown in Figure 18.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 18

Field wiring connections — service switch and thermostat (or end switch) provided by installer

Field wiring

120 VAC
Hot

Service
switch
Neutral

Ground

(not provided)

Thermostat
or end switch
(not provided)

Service
switch
(not provided)

Thermostat
or end switch

Factory wiring

Ground screw

Black

White

Green

Wire nuts

Black

(not provided)

Black

Thermostat
leads, through
jacket left side

Junction box,
boiler left side
85028

For your safety, turn off electrical power supply at

Wiring must be N.E.C. Class 1.

service entrance panel before making any
electrical connections to avoid possible electric shock

hazard. Failure to do so can cause severe personal injury
or death.
Watch polarity of the circuit when connecting the 120
VAC power wiring. If the polarity is switched, the boiler
control module will lockout. The control module will
flash the POWER light to indicate this problem. See
Troubleshooting, manual Section XI.

Part number 550-141-850/0699

If original wiring as supplied with
boiler must be replaced, use only type
105 °C wire or equivalent.
Boiler must be electrically
grounded as required by National
Electrical Code ANSI/NFPA 70-latest
edition.

GOLD GV Water boiler series 3 — manual

VIIa

Start-up — overview
❏ Determine if water treatment will be needed to compensate for water hardness or pH.
❏ Obtain propylene/glycol antifreeze if freeze protection is required. Glycol must be propylene
glycol only, and special requirements may apply when using glycol.
❏ Check for gas leaks (and verify propane odorant level).
❏ Fill system with water and purge air. Verify water piping is leak-free.
❏ Study boiler operating instructions, Section IX. Then start boiler.
❏ Verify water piping, gas piping and vent system are leak-free. Verify igniter operation.
❏ For installations at altitudes over 5,500 feet above sea level, measure gas valve outlet
pressure and adjust if required (see also Section IId).

VIIb

Start-up — preparation
Do not use petroleum-based
cleaning or sealing compounds

in boiler system. Severe damage to
boiler will occur, resulting in
substantial property damage.

Verify water chemistry
Consult local water treatment companies for unusually
hard water areas (above 7 grains hardness) or low pH
water conditions (below 7.0).

Eliminate all system leaks. Continual
fresh makeup water will reduce boiler
life. Minerals can build up in sections,
reducing heat transfer, overheating
cast iron, and causing section failure.

1. Determine antifreeze quantity according to system
water content. Boiler water content is listed in Table
12 on page 95. Remember to include expansion tank
water content.
2. Follow antifreeze manufacturer's instructions.

Freeze protection (when
used)
Use antifreeze made especially for hydronic systems.
Inhibited propylene glycol is recommended.
Do not use ethylene glycol,
automotive or undiluted
antifreeze. Severe personal injury

or death can result.

3. A 50% solution of propylene glycol/water provides
maximum protection to about -30 °F.
4. Local codes may require back flow preventer or
actual disconnect from city water supply.
5. When using antifreeze in a system with automatic
fill, install a water meter to monitor water makeup.
Glycol will leak first at any leak spot. Added water
will dilute the antifreeze, reducing the freeze protection
level.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

VIIb

Start-up — preparation
Verify gas/air orifice plate
The proper orifice plate must be
used. Failure to do so will cause
severe personal injury, death or
substantial property damage.
1. Remove the jacket front panel.
2. Read the boiler size written on the gas/air orifice label
tab, verifying the correct size. See Figure 5b for details.
3. The orifice plate must be plain aluminum for natural
gas. For propane gas, the exposed tab of the plate
should be red.
4. Replace the orifice plate if necessary, following the
guidelines of Section IIc in this manual.

Check for gas leaks
Before starting the boiler, and during
initial operation, smell near the floor
and around the boiler for gas
odorant or any unusual odor. Do
not proceed with start-up if there is
any indication of a gas leak. Repair
any leak at once. Failure to comply
could result in severe personal injury,
death or substantial property
damage.
Propane boilers only — Your
propane supplier mixes an odorant
with the propane to make its presence
detectable. In some instances, the
odorant can fade, and the gas may
no longer have an odor. Before startup (and periodically thereafter), have
the propane supplier verify the
correct odorant level in the gas.
Failure to comply could result in
severe personal injury, death or
substantial property damage.

(cont.)

3. Purge air from system:
a. Connect a hose to the purge valve (shown in
suggested piping illustrations in this
manual). Route hose to an area where water
can drain and be seen.
b. Close the boiler or system isolation valve
between the purge valve and fill connection to
the system.
c. Close zone isolation valves.
d. Open quick-fill valve on cold water makeup
line.
e. Open purge valve.
f. One zone at a time, open the isolation valves.
Allow water to run through the zone,
pushing out the air. Run until no noticeable
air flow is present. Close the zone isolation
valves and proceed with the next zone.
Follow this procedure until all zones are
purged.
g. Close the quick-fill water valve and purge
valve and remove the hose. Open all isolation
valves. Watch that system pressure rises to
correct cold-fill pressure.
h. After the system has operated for a while,
eliminate any residual air by using the
manual air vents located throughout the
system.
i. Relieve any residual air in the boiler piping
using the manual air vent (page 3, item i)
installed on the boiler supply piping.
j. If purge valve is not installed, open manual
air vents in system one at a time, beginning
with lowest floor. Close vent when water
squirts out. Repeat with remaining vents.
4. Open automatic air vent (diaphragm- or bladdertype expansion tank systems only) one turn.

Inspect system water piping
After filling the boiler and system with water, inspect
all piping throughout the system for leaks. If found,
repair immediately. Repeat this inspection after the boiler
has been started and the system has heated up.
Leaks must be repaired at
once. Failure to do so can damage

Fill the system with water

the boiler, resulting in substantial
property damage.

1. Close manual and automatic air vents and boiler
drain cock.

Do not use petroleum-based

2. Fill to correct system pressure . Correct
pressure will vary with each application. Typical cold
water fill pressure for a residential system is 12 psi.

Severe damage to boiler will occur,
resulting in substantial property
damage.

Part number 550-141-850/0699

cleaning
or
sealing
compounds in boiler system.

GOLD GV Water boiler series 3 — manual

VIIc

Start-up — read Section IX
Boiler sequence of operation

Lighting instructions

Manual Section IX contains information about the
operation of the boiler and controls. Read this
information, including the Sequence of operation
diagram, to familiarize yourself with the normal operation
of the control system. Note also the lockout conditions
of the boiler control module, found on the control cover
label.

Section IX also includes a Lighting instruction
procedure for each gas valve used on the GV boiler
(Figure 25 or 26).
Select the correct lighting instruction by reading the model
number on the gas valve (can be viewed with the boiler
front jacket panel removed). Use only the Lighting
instruction procedure for this model gas valve.

Component operating information
Manual Section XI , Troubleshooting includes
additional information about the operation of specific
boiler components.

VIId

Start-up — to operate boiler
Perform final checks before
starting boiler
Read manual Section IX. Select the correct Lighting
instruction procedure (Figure 25 or 26) based on the
gas valve installed in the boiler.

Start the boiler
Follow the correct Lighting instruction from Section
IX to start the boiler.
See Section VIIe if boiler fails to start.

Verify the boiler and system are full of water.
Verify the start-up preparation procedures of Section
VIIb have been completed.
Do not use petroleum-based
cleaning or sealing compounds

in boiler system. Severe damage to
boiler will occur, resulting in
substantial property damage.
Verify that the gas/air orifice
plate has been checked (and
replaced if necessary) per manual
Section IIc. Complete this procedure
before starting boiler. Using an
incorrect gas/air orifice plate will
result in severe personal injury, death
or substantial property damage.

Check system and boiler
Eliminate all system leaks .

Continual fresh makeup water will
reduce boiler life. Minerals can build
up in sections, reducing heat transfer,
overheating cast iron, and causing
section failure.
Venting system must be sealed
gas-tight to prevent flue gas spillage

and carbon monoxide emissions
which could result in severe personal
injury or death. Inspect vent system
per following.
1. Check system piping for leaks. If found, shut
down boiler and repair immediately.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

VIId
Figure 19

Start-up — operate boiler

Check for igniter glow by looking into observation
port on front of blower housing.

(cont.)

2. Vent air from system using manual vents. Air in
the system will interfere with circulation and cause
heat distribution problems and noise.
3. Inspect vent system thoroughly. Check for gastight seal at every connection and seam.
4. Check around the boiler for gas odor following the
procedure of Section VIIb of this manual.
If you discover evidence of any
gas leak, shut down the boiler at
once. Find the leak source with bubble
test and repair immediately. Do not
start boiler again until corrected.
Failure to comply could result in
severe personal injury, death or
substantial property damage.
5. Verify igniter operation — Look through blower
observation port (see Figure 19). Access the blower
by removing the boiler jacket front panel.

Observation port

You should see the igniter glow, particularly during
the igniter warm-up period of the control cycle.

85034

6. After successful operation of boiler and verification
of system (water, vent and gas piping), proceed to
the Check-out procedure, Section VIII of this
manual.

VIIe

Start-up — if boiler doesn’t start . . .
Check for:

1. Loose connections, blown fuse or service switch off?
2. High limit switch set below boiler water temperature?
3. Thermostat set below room temperature?
4. Gas not turned on at meter or boiler?
5. Incoming gas pressure less than 4" w.c.?
If none of the above corrects the problem, refer to
Troubleshooting, manual Section XI.

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

VIIf

Start-up — altitude over 5,500 feet ONLY
Apply the following only when:
• Altitude is over 5,500 feet above sea level.
• You have obtained a high altitude kit (with
tools needed) and installed high altitude air
pressure switch per the instructions of manual
Section IId.
• Boiler has started correctly, following
procedures on previous pages.

Figure 20

Tools required for gas valve outlet
pressure measurement

You will need the tools shown in Figure 20. Adjust the gas
valve outlet pressure only if required as described in the
following instructions.

Connect and adjust manometer
1. Remove boiler jacket top and front.
2. Close manual gas supply valve and turn off electrical
power to boiler.
3. Using 3/16" allen wrench, remove outlet pressure tap
plug from gas control and save plug (Figure 21).
4. Install 1/8" NPT-to-hose barb fitting in gas control
outlet pressure tap as shown (Figure 21).
5. Position and zero manometer per manufacturer’s
instructions.
• Manometer must have at least 6" of tubing
above the fluid level or fluid may be drawn
into the gas control.
If manometer fluid is drawn into gas
control body, gas control must be
replaced. Fluid in valve will cause it
to malfunction, possibly resulting in
severe personal injury, death or
substantial property damage.
6. Disconnect tube from hose barb on gas control vent
tap. Connect tube end to tee hose fitting as shown in
Figure 21. Then add length of hose from tee hose
fitting to gas control vent tap.
7. Connect positive side manometer hose to top of the
tee hose fitting (Figure 21).
8. Connect negative side manometer hose to hose barb
fitting installed in gas control outlet pressure tap
(Figure 21).

85025

1
2
3
4
5
6
7
8

5.
6.
7.

Check Gas Control Set Point
1. Open manual gas valve and turn on electrical power
to boiler.
2. Start boiler and allow boiler to run for 5 minutes.
3. Read manometer. This is the gas control outlet
pressure set point. If set point is between – 0.1" w.c.
and – 0.3" w.c. go to step 7.
4. If gas control set point is not between – 0.1" w.c. and
– 0.3" w.c. remove cap on adjustment tower of gas
control.
• For White-Rodgers Model 36C valves, use

8.
9.
10.
11.
12.
13.

U-tube manometer with tubing - Manometer provides a fine
scale by slanting the manometer (Dwyer Model 1227
recommended).
Tee hose fitting (provided in high altitude kit).
³⁄₁₆" allen wrench.
¹⁄₈" N.P.T.-to-hose barb fitting and wrench for same. (Fitting
is provided in high altitude kit.)
Phillips screwdriver.
¹⁄₄" flat head screwdriver.
Special tool for gas control adjustment cap removal for
White-Rodgers 36C valves (provided in high altitude kit).
Pliers.

pliers and special tool provided (Figure 20,
items 7 and 8).
Turn gas control adjustment screw counter clockwise
to lower gas control set point to – 0.2" w.c.
Reinstall cap to gas control adjustment tower (with
special tool for 36C valves).
Cycle boiler off and on several times to verify gas
control set point. If set point does not remain between
- 0.1" w.c. and – 0.3" w.c., readjust as necessary.
Close manual gas supply valve and turn off electrical
power to boiler.
Remove 1/8" NPT-to-hose barb fitting in outlet
pressure tap of gas control.
Apply pipe sealant to outlet pressure tap plug and
reinstall using 3/16" allen wrench.
Remove tee hose fitting and added tube.
Reinstall hose on gas control vent tap hose barb.
Open manual gas supply valve and turn on electrical
power to boiler.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 21

Carefully connect manometer to gas valve as shown, following instructions on opposite page.

Cap on adjustment tower

Gas control outlet
pressure tap —
Remove allen screw from
gas control outlet pressure
tap and install hose barb
as shown.

At Least
6 Inches
Manifold

+ Robertshaw
Model
7200DERN-680

Gas control
vent tap

Add tee
hose
fitting as
shown

Gas outlet
piping
Add hose from gas
control vent tap to
tee hose fitting

White-Rodgers
Model 36E66-302

Gas control outlet
pressure tap —
Remove allen screw from
gas control outlet pressure
tap and install hose barb
as shown.

Gas control
vent tap

Part number 550-141-850/0699

Existing hose
to gas control vent
tap hose barb —
Remove from
gas control vent
tap and connect
to end of tee
as shown

85026

GOLD GV Water boiler series 3 — manual

VIIIa

Check-out procedure — overview

Overview of this ❏ Perform the checklist following to ensure boiler is operating correctly.
section ❏ Fill in the Installation and service certificate at the end of the checklist.

VIIIb

Check-out procedure — checklist

Check off steps as ! Boiler and heat distribution units filled with water?
completed ! Automatic air vent, if used, open one full turn?
! Air purged from system?
! Air purged from gas piping? Piping checked for leaks?
! Is proper orifice plate installed? Refer to manual Section IIc to check size
and fuel type.
Proper orifice plate must be used. Failure to do so will
cause severe personal injury, death or substantial property
damage.

! Followed operating instructions on boiler or in manual Section VII for
proper start-up?

! Is igniter glow visible? Refer to Verify igniter operation, manual Section
VIId, step 5.

! Inspect vent system for leaks. Verify vent (and air) piping are functional
and unobstructed.

! Test limit control — While burner is operating, move indicator on limit
control below actual boiler water temperature. Blower and burner should
go off while circulator continues to operate. Raise setting on limit control
above boiler water temperature and burner should reignite.

! Test additional field-installed controls — If boiler has a low water cutoff,
additional high limit or other controls, test for operation as outlined by
manufacturer. Burner should be operating and should go off when controls
are tested. When controls are restored, boiler should restart.

! Test ignition system (control module):
a.
b.
c.
d.

Connect voltmeter to gas valve terminals.
Turn off manual gas valve.
Set thermostat to call for heat.
Control module will begin purge cycle, then activate igniter. Igniter
will glow for approximately 20 seconds. Near end of 20 seconds,
24 VAC will show at gas valve for approximately 6 seconds and then
Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

VIIIb

Check-out procedure — checklist

(cont.)

return to 0 VAC. Control will attempt ignition two more times, increasing igniter
time to 30 seconds for these attempts. The control will then lockout, flashing the
POWER and FLAME lights.
To restart system, follow Lighting instructions on boiler or in manual Section IX.
(Control will reset after power has been off for at least 45 seconds.)

! Set limit control(s) to system temperature requirements. Adjust balancing valves and
controls to provide design temperature to system.

! For multiple zones, adjust flow so it is about the same in each zone.
! Verify thermostat heat anticipator (if available) set properly? Refer to Field wiring, manual
Section

VI, Thermostat(s).

! Cycle boiler with thermostat — Raise to highest setting and verify boiler goes through
normal start-up cycle. Lower to lowest setting and verify boiler goes off.

! Measure natural gas input:
a.
b.
c.
d.

Operate boiler 10 minutes.
Turn off other appliances.
At natural gas meter, measure time (in seconds) required to use one cubic foot of
gas.
3600 x 1000
Calculate gas input:
= Btuh
number of seconds from step c

!
!
!
!

e. Btuh calculated should approximate input rating on boiler rating label.
Observe several operating cycles for proper operation.
Set room thermostat to desired room temperature.
Fill in Installation and service certificate below?
Review all instructions shipped with this boiler with owner or maintenance person. Return
instructions to envelope and give to owner or place in pocket inside front panel in boiler.

Installation and service certificate
Boiler model __________________
Measured Btuh input ____________

Installer ________________________
(company)

Series __________
!
!
!
!

CP number ___________

Date installed _______________

Installation instructions have been followed.
Check-out sequence has been performed.
Above information is certified to be correct.
Information received and left with owner/maintenance person.
________________________________
(address)

______________________________
(phone)

_____________________________________
(installer’s signature)
Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

IXa

Operation — overview

Overview of this ❏ The GCM (control module) is equipped with five indicator lights, used to
show normal and problem situations. See Figure 22 for the normal sequence
section
of operation of the boiler and control, and the status of the lights at each
stage. For explanation of the lockout conditions of the GCM lights, see
manual Section X, Troubleshooting.

❏ Figure 23 shows the ladder wiring diagram for the GV series 3 boiler.
❏ Figure 24 is the schematic wiring diagram, showing the destination of each
of the wire harnesses attached to the control module.
❏ Figure 25 is the Lighting instruction sheet for boilers equipped with
Robertshaw model 7200DERN valves.
❏ Figure 26 is the Lighting instruction sheet for boilers equipped with WhiteRodgers model 36E valves.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

IXb Operation — sequence
Figure 22

Ignition control module sequence of operation — status light indications
POWER

Steps

TSTAT
CIRC

Call for
heat?

LIMIT

PRESS
SWITCH

FLAME

Timing

(Following step 8, cycle goes back to step 1.)

1. Standby

Waiting for call for heat

—

YES

—

YES

—

YES

35 sec

YES

6 sec

YES

—

YES

—

30 sec

2. Call for heat

·
·

Circulator on
Blower on

3. Limit circuit

·
·

Limit controls closed
Block switch contacts closed

4. Pressure circuit

·
·

Pressure switch contacts closed
Igniter heating

5. Flame proven

·
·
·

Gas valve open
Ignitor remains on
Boiler producing heat

6. Limit cycle

·
·

Limit circuit open
Gas valve closed

7. Flame outage *

·
·

Flame out
Boiler recycles

8. Thermostat satisfied

·
·

Circulator off
Blower postpurge

= "ON"

= "OFF"

* If flame is not proven in 4 seconds, boiler recycles 2 times to retry for ignition before going into lockout. Recycle igniter timing is 30 seconds.
Postpurge and prepurge are performed on every cycle. In event of lockout, ignition control will automatically restore sequence of operation
after either:
1 hour waiting period.
Opening and closing of thermostat circuit.
Removal of 120 VAC power for at least 45 seconds.
85050

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

IXb Operation — wiring diagrams
Figure 23

Ladder wiring diagram
120 VAC

Gnd

Service switch (not provided)

Igniter

Electrical shock hazard — can cause severe
injury or death. Disconnect power before
installing or servicing.

Blower
motor

All contacts are shown without power applied.

System
circulator

Ladder diagram legend
Control module
120 VAC
section

120 VAC hot field wiring
120 VAC neutral field wiring

Bypass
circulator

24 VAC field wiring
120 VAC hot factory wiring
120 VAC

120 VAC neutral factory wiring
Low voltage factory wiring
24 VAC

Ground connectors

Notes
1.

Power

All wiring must be installed in accordance with:
a.

U.S.A. — N.E.C. and any other national, state, or local
code requirements.

Canada — C.S.A. C22.1 C.E.C. Part 1 and any other
national, provincial, or local code requirements.

U.S.A. — N.E.C. Class 1.

Canada — C.S.A. C22.1 C.E.C. Part 1.

If any of the original wire as supplied with the appliance must
be replaced, use type 90 °C or its equivalent.

Thermostat anticipator setting (single zone):
0.1 AMP + Gas valve current

For multiple zoning, use either zone valves or circulators. Refer
to the component manufacturer's instructions and this manual
for application and wiring suggestions.

Refer to control component instructions packed with the
boiler for application information.

Gas valve

Tstat–Circ
Block temp
limit switch

Water temp
limit switch

Limit

All wiring must be:

Thermostat (not provided)

Air pressure
switch

Press switch

Flame

Flame
sensor
Water temp sensor

Control module
low voltage
section
85030

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Schematic wiring diagram

120 VAC
Hot

Field wiring

Figure 24

Service
switch

Ground

Neutral

(not provided)

Thermostat
or end switch
(not provided)

Service
switch
(not
provided)

Thermostat
or end switch

Plug-in connectors

White

Red

Factory wiring

Ground screw

120 VAC hot/neutral
Low voltage (colors vary)

Black

White

Green

(not provided)

Wire nuts

Black

Thermostat
leads, through
jacket left side
Junction box,
boiler left side

Ground connectors

R
R

Red
hose

White
hose

Air pressure
switch

Transformer

System circulator

Bypass circulator

R BL
W

G
B

BL
Y

Y
B

GCM

FLAME

PRES SWITCH

LIMIT

POWER

TSTAT CIRC

Block
temperature
limit switch

BR R

Water
temperature
sensor

B
BL BL

Blower
motor
Gas
valve
Y

85029

Water
temperature
limit switch

Part number 550-141-850/0699

Hot surface
igniter

GOLD GV Water boiler series 3 — manual

IXc
Figure 25

Operation — lighting instructions

Lighting instructions for boiler equipped with Robertshaw model 7200DERN gas valve

FOR YOUR SAFETY READ BEFORE OPERATING
If you do not follow these instructions exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
A. This appliance does not have a pilot. It is equipped
with an ignition device which automatically lights
the burner. Do not try to light the burner by
hand.

C. Use only your hand to depress and move Selector arm on gas
valve. Never use tools. If the arm will not depress or move by
hand, don't try to repair it, call a qualified service technician.
Force or attempted repair may result in a fire or explosion.

B. Before OPERATING, smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor. See below.

D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and any
gas control, which has been under water.

WHAT TO DO IF YOU SMELL GAS

•

Do not try to light any appliance.

•

Do not touch any electric switch; do not use any
phone in your building.

Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.

•

If you cannot reach your gas supplier, call the fire department.

OPERATING INSTRUCTIONS
1.
2.
3.
4.
5.
6.
7.

8.
9.
10.
11.
12.

STOP! Read the safety information above on this label.

Set the thermostat to lowest setting.
Turn off all electrical power to the appliance.
Remove jacket top panel.
This appliance is equipped with an ignition device which automatically lights the burner. Do
not try to light the burner by hand.
Depress Selector arm slightly and move left
to OFF.
Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you
smell gas, STOP! Follow "B" in the safety information above. If you don't smell gas, go to
the next step.
Depress Selector arm slightly and move right
to ON.
Turn on all electric power to the appliance.
Set thermostat to desired setting.
If the appliance will not operate, follow the instructions "TO TURN OFF GAS TO
APPLIANCE" below and call your service technician or gas supplier.
Replace jacket top panel.

Robertshaw gas valve
model 7200DERN
Selector arm

85020

NOTE: Selector arm cannot be
moved to OFF unless arm is
pushed in slightly. DO NOT force.

TO TURN OFF GAS TO THE APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Remove jacket top panel.
4. Depress Selector arm slightly and move left

to OFF. Do not force.

5. Replace jacket top panel.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 26

Lighting instructions for boiler equipped with White-Rodgers model 36E gas valve

C. Use only your hand to turn the Control knob on gas valve.
Never use tools. If the knob will not turn by hand, don't try to
repair it. Call a qualified service technician. Force or attempted
repair may result in a fire or explosion.

B. Before OPERATING, smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor. See below.

WHAT TO DO IF YOU SMELL GAS

•

Do not try to light any appliance.

•

Do not touch any electric switch; do not use any
phone in your building.

Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.

•

If you cannot reach your gas supplier, call the fire department.

OPERATING INSTRUCTIONS
1.
2.
3.
4.
5.
6.
7.

8.
9.
10.
11.
12.

STOP! Read the safety information above on this label.

Set the thermostat to lowest setting.
Turn off all electrical power to the appliance.
Remove jacket top panel.
This appliance is equipped with an ignition device which automatically lights the burner. Do
not try to light the burner by hand.
Turn Gas control knob to OFF.
Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you
smell gas, STOP! Follow "B" in the safety information above. If you don't smell gas, go to
the next step.
Turn Gas control knob to ON.
Turn on all electric power to the appliance.
Set thermostat to desired setting.
If the appliance will not operate, follow the instructions "TO TURN OFF GAS TO
APPLIANCE" below and call your service technician or gas supplier.
Replace jacket top panel.

White-Rodgers gas valve
model 36E
Gas control knob

85022

Position
indicator

TO TURN OFF GAS TO THE APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Remove jacket top panel.
4. Turn Gas control knob to OFF.
5. Replace jacket top panel.

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Service and maintenance — overview

Overview of this section ❏ Review Table 4 with the owner to advise of the need for
annual start-up and service by a qualified technician.

❏ Review Table 4 with the owner, explaining the
maintenance required and procedures to follow.
❏ The following pages of this section provide detailed
instructions for each of the service and maintenance items
given in Table 4.
❏ Do not attempt the service and maintenance items listed
without reviewing the detailed information on the
following pages.
Follow the Service and maintenance
procedures given throughout this manual and
in component literature shipped with the
boiler. Failure to perform the service and
maintenance could result in damage to the
boiler or system. Failure to follow the
directions in this manual and component
literature could result in severe personal
injury, death or substantial property damage.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Service and maintenance — schedule
Table 4

Service and maintenance schedules

Service technician

Owner maintenance

(see following pages for instructions)

ANNNUAL

START-UP

Inspect:
•
•
•
•
•
•
•

Any problems reported by owner
Boiler area
Air openings
Flue gas vent
Boiler heating surfaces
Water piping
Condensate drain system

Service:

• Check boiler area
Daily

• Check air openings
• Check pressure gauge

• Check boiler interior piping
• Check venting system
Monthly

• Check air vents
• Check condensate drain system

• Lubricate blower motor
• Lubricate any circulators requiring oil

• Check relief valve

Start-up:
• Perform start-up per manual

Check/test:
•
•
•
•

Check gas piping for leaks
Check cold fill & operating pressures
Check temperature mixing system
Check/maintain components - vents,
limits, expansion tank, gauges, igniter
• Inspect & operate relief valve

• Test low water cutoff (if used)
Periodically

• Clean vent termination/air intake
screens

• Oil blower motor
Every 6 months
• Operate relief valve

Review:
• Review maintenance procedures with
owner

Part number 550-141-850/0699

End of season

• Shut down procedure

GOLD GV Water boiler series 3 — manual

Service & maintenance — annual start-up

Annual start-up only
by qualified service
technician

The boiler should be inspected and started annually, at the beginning
of the heating season, only by a qualified service technician. In addition, the
maintenance and care of the boiler designated in Table 4 and explained on the
following pages must be performed to assure maximum boiler efficiency and
reliability. Failure to service and maintain the boiler and system could result
in equipment failure.

Annual start-up — Reported problems
inspect Inspect any problems reported by owner and correct before proceeding.
Boiler area
1. Verify that boiler area is free of any combustible materials, gasoline and other flammable
vapors and liquids.
2. Verify that boiler area (and air intake) is free of any of the contaminants listed on page 13
of this manual. If any of these are present in the boiler intake air vicinity, they must be
removed. If they cannot be removed, install combustion air piping to the boiler in accordance
with the appropriate venting supplement.

Air openings
1. Verify that combustion and ventilation air openings to the boiler room and/or building are
open and unobstructed. Check operation and wiring of automatic combustion air dampers,
if used.
2. Verify that boiler vent discharge and air intake are clean and free of obstructions.

Flue gas vent system (and air inlet piping)
1. Visually inspect entire flue gas venting system (and air piping, if installed) for
blockage, deterioration or leakage. Repair any joints that show signs of leakage in accordance
with vent manufacturer’s instructions. When air is ducted to boiler, verify that air inlet hose is
connected and properly sealed.
Failure to inspect for the above conditions and have them repaired can
result in severe personal injury or death.

Boiler heating surfaces
1. Obtain a GV gasket replacement kit. This kit contains four gaskets — igniter gasket, vent
starter tee gasket, inspection port gasket, and burner gasket.
Electrical shock hazard — Turn off power to the boiler before any
service operation on the boiler except as noted otherwise in this instruction
manual. Failure to turn off electrical power could result in electrical shock,
causing severe personal injury or death.
2. Remove the jacket top panel and jacket front panel after turning off power to the boiler.
3. Remove the two nuts retaining the flueway inspection port cover (page 3, item g).
Remove the flueway inspection port cover.
4. Inspect the boiler vent outlet area and heating surfaces by looking through the opening.
5. If the boiler flueways show accumulation of soot, follow Cleaning boiler heating surfaces
in this manual section to remove the blower housing and clean the boiler. If there is evidence
of a large accumulation of rusty scale deposits, check the temperature mixing system.
6. Replace the flueway inspection port cover.
58

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Annual start-up — Water piping
inspect 1. Check the boiler interior piping and all system piping for signs of leaks.
2. Repair any leaks before proceeding.
Eliminate all system leaks. Continual fresh makeup water will reduce

boiler life. Minerals can build up in sections, reducing heat transfer, overheating
cast iron, and causing section failure.
Do not use petroleum-based cleaning or sealing compounds in boiler
system. Severe damage to boiler will occur, resulting in substantial property
damage.

Condensate drain system
1. Inspect the condensate trap hose for deterioration.
2. Check for any obstructions in the trap hose by squeezing the tubing.
3. If there is any doubt the condensate drain system is flowing freely, remove the clamp and hose
from the bottom of the vent starter tee. Slide a funnel outlet into the trap hose and pour water
through. It should exit at the termination of the condensate drain line.
4. If the owner’s monthly inspection of the condensate drain system has indicated a tendency for
the trap to run dry, install a condensate drain line check valve kit, available through
your Weil-McLain distributor. See installation instructions for check valve kit in this manual
section.

Annual start-up — Blower motor (Figure 27)
service 1. With boiler power OFF, place a few drops of S.A.E.

Figure 27

Blower motor

20 motor oil in each of the two oil cups.

Use only S.A.E. 20 motor oil to
lubricate the blower motor. Do not
use universal household oils. Motor
could be damaged, resulting in
possible severe property damage.

Oiled-bearing circulators

Oil
cup

1. Both of the circulators installed in the boiler are waterlubricated. No oiling is required.
2. Check other circulators in the system. Oil any
circulators requiring oil, following circulator
manufacturer’s instructions. Over-oiling will damage
the circulator.

Oil cup
85037

Annual start-up — Start-up procedure
start-up 1. Follow the instructions in manual Section VII.
2. Verify cold fill pressure is correct and that fill system is working properly.
3. Verify antifreeze level (if used) is at the right concentration and that inhibitor level is
correct.
4. Check gas piping, per manual Sections V and VIb, verifying no indications of leakage and
all piping and connections are in good condition.
5. Read the Lighting instructions (Figure 25 or 26 of this manual or on boiler label) applying
to the boiler (ensuring the instruction applies to the gas valve installed in the boiler).
6. Start the boiler following the Lighting instructions and manual Section VIId.
Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

Service & maint. — annual start-up

(cont.)

Annual start-up — Gas piping
check/test 1. Sniff near floor and around boiler area for any indication of a gas leak.
2. Test gas piping using bubble test, per Section V of this manual, if there is any indication
of a leak.

Cold fill and operating pressures
1. While the system is cold, note the pressure reading on the boiler pressure/temperaure
gauge. Verify that cold fill pressure is correct.
2. Watch the pressure as the boiler and system heat up to ensure pressure rise is normal. Too
high a rise would indicate a waterlogged or undersized expansion tank.

Temperature mixing system
1. Carefully check the temperature of the system return piping as it passes through the
boiler jacket and on the return pipe inside the boiler jacket just before it enters the
boiler sections. You may do this with a surface pyrometer or by lightly touching the piping
with your fingers.
To avoid potential of severe burn — Do not rest hands on or grasp
pipes. Use a light touch only. Return piping may heat up quickly.
2. The temperature of the water entering the boiler sections should quickly heat up to about
130 °F, being considerably hotter than the return water from the system.
3. This is accomplished with the two internal boiler circulators. The Bypass circulator
(page 2, item 7) takes hot water from the boiler supply outlet and blends it with return water.
The System circulator (page 2, item 6) slows down to aid in raising the return temperature
entering the sections.
4. If the temperature mixing system does not work correctly, check the two circulators to be
sure they are flowing water. If the circulators are operating normally but the temperature
mixing system does not maintain water at the enterance to the boiler sections at 130 °F, you
may need to replace the boiler control module or water temperature sensor (page 2, item 8).

Air vents and air elimination

Figure 28

1. Inspect automatic air vents (if used). Also inspect air
separators to ensure they are operational.

2. The cap must be unscrewed one turn to allow air to
escape.

Automatic air vent

3. See Figure 28. If the air vent is leaking, remove cap A
and briefly push valve B and then release to clean the
valve seat.
4. Replace cap A by twisting all the way onto valve B
and then unscrewing one turn.

Limit controls and cutoffs
1. Inspect and test the boiler limit control. Verify
operation by turning control set point below boiler
temperature. Boiler should cycle off. Return dial to
original setting.
2. Inspect and test additional limit controls or low water
cutoffs installed on system.
60

85036

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Annual start-up — Expansion tank
check/test 1. Expansion tanks provide space for water to move in and out as the heating system water
expands due to temperature increase or contracts as the water cools. Tanks may be open-,
closed- or diaphragm- or bladder-type. See Section III of this manual for suggested best
location of expansion tanks and air eliminators.
Open-type — Located above highest radiator or baseboard unit, usually in the attic or

closet. Has a gauge glass and overflow pipe to a drain.
Closed-type — Welded gas tight and located above boiler. Tank is partially filled with water,

leaving an air cushion for expansion.
• Make sure this type of tank is fitted with a tank fitting, such as the B & G Tank-Trol
or Taco Taco-Trol. This fitting reduces gravity circulation of air-saturated tank water
back to the system and prevents the air from bubbling up through the water as it
returns from the system.
• Do not use automatic air vents in systems with closed-type tanks. The air
will escape from the system instead of returning to the tank. Eventually, the tank will
waterlog and no longer control pressurization. The boiler relief valve will weep
frequently.
Diaphragm- or bladder- type — Welded gas tight with a rubber membrane to separate

the tank pressurizing air and the water. May be located at any point in the system, but most
often found near the boiler.
• Systems with this type of expansion tank require at least one automatic air vent,
preferably located on top of an air eliminator, as shown in examples in manual
Section III.
2. If relief valve has tended to weep frequently, the expansion tank may be waterlogged or
undersized.
Closed-type tank — Tank is most likely waterlogged. Install a tank fitting if not already

installed. Then check fill level per fitting manufacturer’s instructions. If fill level is correct,
check tank size against manufacturer’s instructions. Replace with a larger tank if necessary.
Diaphragm- or bladder type — First, check tank size to be sure it is large enough for the

system. If size is too small, add additional tank(s) as necessary to provide sufficient expansion.
If tank size is large enough, remove tank from system and check charge pressure (usually 12
psig for residential applications). If tank won’t hold pressure, membrane has been damaged.
Replace tank.

Gauges

Figure 29

Igniter observation port in blower

1. Boiler pressure/temperature
gauge — Inspect gauge and check
whether readings are reasonable.
Replace if any signs of leakage
from case or improper readings.
2. System gauges (if installed) —
Inspect and check readings of
other gauges in system.

Igniter
1. Verify igniter operation — Look
through blower observation port
(see Figure 29). Access the blower
by removing the boiler jacket
front panel if not already
removed.
Part number 550-141-850/0699

Observation port

85034

GOLD GV Water boiler series 3 — manual

Service & maint. — annual start-up

Annual start-up — Boiler relief valve
check/test 1. Inspect the relief valve and lift the lever to verify flow

Figure 30

(cont.)

Relief valve

as in the following warnings, excerpted from a relief
valve manufacturer’s warning label. Before operating
any relief valve, ensure that it is piped with its discharge
in a safe area to avoid severe scald potential. Read
manual Section IIIb before proceeding further.
Safety relief valves should be
reinspected AT LEAST ONCE
EVERY THREE YEARS , by a

licensed plumbing contractor or
authorized inspection agency, to
ensure that the product has not been
affected by corrosive water
conditions and to ensure that the
valve and discharge line have not
been altered or tampered with
illegally. Certain naturally occurring
conditions may corrode the valve or
its components over time, rendering
the valve inoperative. Such
conditions are not detectable unless
the valve and its components are
physically removed and inspected. This inspection must only be conducted
by a plumbing contractor or authorized inspection agency — not by the
owner. Failure to reinspect the boiler relief valve as directed could result in
unsafe pressure build-up, which can result in severe personal injury, death or
substantial property damage.
85035

Following installation, the valve lever must be operated AT LEAST
ONCE A YEAR to ensure that waterways are clear. Certain naturally occurring
mineral deposits may adhere to the valve, rendering it inoperative. When
manually operating the lever, water will discharge and precautions must be
taken to avoid contact with hot water and to avoid water damage. Before
operating lever, check to see that a discharge line is connected to this valve
directing the flow of hot water from the valve to a proper place of disposal
otherwise severe personal injury may result.
If no water flows, valve is inoperative. Shut down boiler until a new

relief valve has been installed.
2. After following the above warning directions, if the relief valve weeps or will not seat properly,
replace the relief valve. Ensure that the reason for relief valve weeping is the valve and not
over-pressurization of the system due to expansion tank waterlogging or undersizing.

Annual start-up — Review with owner
owner review 1. Review the User’s information manual with the owner.
2. Emphasize the need to perform the maintenance schedule specified in the User’s information
manual.
3. Remind the owner of the need to call in a licensed contractor should the boiler or system
exhibit any abnormal behavior.
4. Remind the owner to follow the proper shutdown procedure and to schedule an anuual
start-up at the beginning of the next heating season.
62

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Service & maint. — special procedures
Condensate drain line check valve kit
The service procedures listed in
Section IXc of this manual must only
be performed by a qualified boiler
service technician. Failure to comply
could result in severe personal injury,
death or substantial property
damage.

Figure 31

Condensate drain line check valve
kit, installed — Refer to kit for
detailed instructions.

1. If the owner finds that flue gases frequently leak from
the condensate trap hose, install the condensate drain
line check valve kit.
Under some circumstances a GV vent
system may not produce enough
condensate to keep the condensate
trap full of liquid. If the trap is not
full, small amounts of flue products
can be emitted into the boiler room
through the condensate drain line.
Contact a qualified service technician
to install a condensate drain line
check valve kit.
2. Obtain the kit from your Weil-McLain distributor
and follow the instructions included with the kit.
3. See Figure 31 for a typical installation of the check
valve on the condensate drain line.

Part number 550-141-850/0699

Condensate drain line
check valve assembly

85032

GOLD GV Water boiler series 3 — manual

Service & maint. — special proced.

(cont.)

Cleaning boiler heating surfaces
The service procedures listed in Section IXc of this manual must only be performed by a qualified
boiler service technician. Failure to comply could result in severe personal injury, death or substantial
property damage.
1. If inspection of the boiler flueways indicates the
presence of soot, clean the boiler heating surfaces
using the following procedure. The process requires
removing the blower housing to allow spraying water
through the boiler combustion chamber.
Before proceeding, obtain a GV gasket replacement
kit, consisting of igniter, vent starter tee, flueway
inspection port and blower gaskets.

To clean heating surfaces
1. Replace flueway inspection port cover (page 3, item g).
2. Remove the corrugated drain tubing from the bottom
of the vent starter tee by releasing the tube clamp.

To remove the blower assembly

3. Place a catch pan under the tee to catch the cleaning
water.

1. Turn off boiler by turning down the thermostat. Then
turn off power at the boiler service switch. Close
manual gas valve on incoming gas line to boiler.

4. Spray water into the boiler combustion chamber
opening.

Turn off power and gas to the boiler.
Failure to do so can cause severe
personal injury, death or substantial
property damage.
Wait several minutes after boiler has
stopped to allow the igniter to cool
to avoid severe personal injury or
death.
2. See Figure 32.
3. Disconnect:
• gas tubing from gas valve outlet (NOTE that
this is a left-hand thread) by rotating the
hex fitting clockwise looking at the valve outlet.
• pressure switch hoses.
• air inlet hose.
• blower motor wiring harness from control
module.
• igniter harness connected to igniter plug.
• blower support bracket (remove screw
securing blower housing to bracket — on left
side of blower housing).
• ground wire.
4. Remove the two igniter screws and washers. Carefully
remove the igniter. Use care when handling — igniter
is very brittle. DO NOT touch igniter surface with
hands or expose to any greasy substances.
5. Remove nuts from studs securing blower housing to
front section.
6. Grasp blower housing and pull free from studs. Turn
clockwise slightly, until blower assembly can be
removed safely from inside of boiler jacket.
64

7. Remove burner cone and gasket for inspection.

5. Catch the runoff water in the pan below the vent
starter tee.
6. Continue process until flueways are clean.

Replace blower assembly
1. Place a new blower housing gasket over the studs at
combustion chamber opening.
2. Reinstall burner cone into chamber opening.
3. Position blower assembly over studs. Install nuts and
tighten.
4. Install igniter and new igniter gasket. Fasten with
screws and washers. Tighten only with hand-held
screwdriver. DO NOT use electric or pneumatic
driver. Excessive torque will damage igniter. Do not
exceed 20 inch-pounds torque.
5. Connect:
a. gas tubing to gas valve outlet (turning lefthand thread hex fitting counterclockwise to
tighten).
b. pressure switch hoses.
c. hose from gas valve to gas/air manifold.
d. air inlet hose.
e. blower motor wiring harness to control
module.
f. igniter harness to igniter plug.
g. blower support bracket (with screw).
h. ground wire.
6. Be sure all wiring and hose connections are correct
per Figure 32 and are secure on the hose barb fittings.
Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 32

Blower housing removal procedure

Air pressure
switch
Blower motor
wiring harness

Blower
support
bracket

Burner gasket (replace)
Burner cone
and ring assembly
Igniter gasket (replace)
NT
VE
MOD
EL
24V 36C9
MAX60 HZ8
NE PR
C RE ESSU 8 AM
G - RE PS TYPE
1“ ½
303
WC PS
IG
E2
0
9647

S
ES
PR
OT
PIL

Igniter

Gas/air orifice plate

P
TA

Gas tubing

Red pressure switch hose
White pressure switch hose

Inlet air hose and clamps
85040

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIa

Troubleshooting — overview

Overview of this ❏ Section XIb — troubleshooting procedures.
section
❏ Section XIc — procedure for checking air pressure switch.
❏ Section XId — special servicing tips (for igniter, gas valve and blower
housing).
❏ Section XIe — control module.
❏ Section XIf — common problems and possible solutions.
❏ Section XIg — troubleshooting GCM indicator light conditions.
Chart 1 — POWER light conditions
Chart 2 — POWER and TSTAT CIRC lights flashing
Chart 3 — POWER and LIMIT lights flashing
Chart 4 — POWER and PRES SWITCH lights flashing
Chart 5 — POWER and FLAME lights flashing
Chart 6 — TSTAT CIRC light flashing by itself
Chart 7 — LIMIT light flashing by itself
Chart 8 — Insufficient or no heat condition

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

XIb

Troubleshooting — procedures
Label all wires prior to disconnection when servicing controls. Wiring

errors can cause improper and dangerous operation.
Never jumper (bypass) any device except for momentary testing as
outlined in Troubleshooting charts. Severe personal injury, death or

substantial property damage can result.
The control module and boiler controls can malfunction if they get wet.
Never try to use a control that has been flooded or wet. Replace it. Failure to
comply can result in severe personal injury, death or substantial property
damage.

Before troubleshooting:
1. Have a voltmeter that can check 120 VAC and 24 VAC and a continuity
checker.
2. Check for 120 VAC (min. 102-max.132) to boiler.
3. Make sure thermostat is calling for heat and contacts (including
appropriate zone controls) are closed. Check for 24 VAC between
thermostat wire nuts and ground.
4. Have an inclined manometer with 0 – 2" w.c. range.

Check the following:
1. Wire connectors to control module are securely plugged in at module
and originating control.
2. Hoses are properly and securely plugged in and are not damaged.

VERIFY PROPER OPERA
TION AFTER SER
VICING.
OPERATION
SERVICING.

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIc

Troubleshooting — air pressure switch
Checking the air pressure switch
Do not use manometer as shown in Figure 33 to test gas valve outlet pressure. Where instructed
in this manual to check gas valve outlet pressure, follow instructions carefully, particularly regarding
connection of manometer. Manometer fluid will cause permanent damage to gas valve. Severe
personal injury, death or substantial property damage can result.

Check switch pressure setting
1. See Figure 33.
2. Remove both air pressure switch hoses from air
pressure switch.

Figure 33

Connecting a manometer to
check air pressure switch. DO
NOT use this arrangement to
check gas valve.

3. Install tees and tubing as shown in Figure 33 to
inclined manometer.
4. Turn off gas valve and set thermostat to call for heat.
Blower will run but burner will not ignite.

Suction

Pressure

5. Check for 24 VAC between both air pressure switch
terminals and ground.
6. If manometer reading is at least 1.4" w.c., but there is
not 24 VAC between both air pressure switch
terminals and ground, replace air pressure switch.

Inclined tube
manometer

Troubleshooting air pressure reading
1. If manometer reading is lower than 1.4" w.c. check
for possible causes:
•

blockage in hoses.

•

loose blower wheel on motor shaft.

•

blower motor not at proper rpm.

•

blockage in air inlet or hose.

•

blockage in flue pipe or termination.

•

condensate trap filled w/condensate.

Red

White

Return to normal operation
1. When pressure reading is proper and air pressure
switch is operating properly, remove tees and reinstall
hoses to air pressure switch.

Shown with Robertshaw 7200DERN gas control

85027

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

XId

Troubleshooting — servicing tips
Igniter
Wait several minutes until igniter
cools down before attempting
replacement. Failure to do so will
cause severe personal injury.
1. Disconnect igniter from igniter wiring harness and
remove igniter before removing blower assembly.
2. Replace igniter gasket if original gasket is frayed or
damaged.
3. Igniter is fragile - handle with care. Do not touch
igniter surface with bare hands. Body oils can cause
failure of the carbide.
85060

Gas Valve
Gas valve operates with a negative
pressure at the outlet —
approximately -0.2" w.c. — do not
set gas pressure higher than this.
Follow instructions in this manual
carefully if testing gas valve outlet
pressure. Failure to comply can result
in severe personal injury or death.

The gas valve outlet tapping is a lefthand thread. Rotate counterclockwise to tighten, clockwise to
loosen. When replacing valve, replace
only with valve listed in this manual
for use with the GV boiler. Failure to
comply could result in severe
personal injury, death or substantial
property damage.

Robertshaw
Model 7200DERN-680
White-Rodgers
Model 36E66-302

85061

Blower Housing
Do not disassemble blower housing.
A fire or explosion causing severe
personal injury, death or substantial
property damage can result. If you
suspect a problem, replace blower
housing. Follow instructions in
manual Section IX, Cleaning boiler
heating surfaces for blower
housing removal and replacement.
85062

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIe

Troubleshooting — control module
Control Module
Make sure ground wiring is installed per wiring diagram.
Good grounding is extremely important for proper
operation.
Solder or water splatter between
plugs and circuit board can cause
improper operation of control
module. Place a shield over the boiler
internal controls and components
during installation. Failure to comply
could result in severe personal injury,
death or substantial property
damage.

Control indicator lights —
lockout modes
See Charts 1 through 8 in this section for detailed troubleshooting procedures.
To reset control after a lockout, turn off power at the 120
VAC service switch or turn down all thermostats. Wait 45
seconds. Then restore power or call for heat.
After an over-temperature lockout (POWER and LIMIT
lights flashing), the control will only reset after
interruption of 120 VAC for 45 seconds. (And temperature
at return water temperature sensor must be below 240 °F.)

POWER light flashing alone
Usually indicates reversed polarity of 120 VAC power
wires.
85063

POWER and TSTAT CIRC lights flashing
Usually indicates stray voltage on external thermostat
circuit wires or return water temperature entering boiler
sections has not reached 130 °F within 20 minutes.

Non-lockout light conditions

POWER and LIMIT light flashing alternately

TSTAT CIRC light flashing alone

Usually indicates that limit circuit failed to cut off boiler
at high temperaure — return water temperature sensor
has sensed water over 235 °F.

Usually indicates return water temperature sensor detects
water at boiler return pipe less than 40 °F. Both internal
circulators will run continuously, even with no call for
heat, until temperature rises.

POWER and PRES SWITCH lights flashing
Usually indicates pressure switch is closed when it should
not be, or pressure switch failed to close within 5 minutes
of blower starting.

POWER and FLAME lights flashing
Usually indicates control has had three unsuccessful
ignition attempts or sensed flame when it shouldn’t be
there.
70

LIMIT light flashing alone
Usually indicates an open or shorted return water
temperature sensor.

Troubleshooting the GCM
See Figure 34 for location of harness plug receptacles and
plugs on the control module.
Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 34

GCM (control module) harness plug receptacle and indicator light locations.

White

Green

White

Green

Black

120 VAC N

120 VAC N
White
Ground

120 VAC N

Black

Green
120 VAC H

Ground

120 VAC N
Ground

120 VAC H

Black

120 VAC H

to System
circulator
(long harness)

120 VAC H
120 VAC IN

to Bypass
circulator
(short harness)
120 VAC
to circulators

120 VAC to
blower motor

Red wires to
pressure switch

White
120 VAC N

Blue wires to
gas valve

Black
120 VAC H

Yellow wires
to limit control
and block temp
switch

120 VAC to
transformer

Black wires to
thermostat circuit
24 VAC control
circuits

Black leads
to water
temperature
sensor

120 VAC IN
120 VAC to transformer
120 VAC to blower motor

24 VAC

Brown

Indicator lights

water temp
sensor

120 VAC to circulators

Red

POWER
TSTAT CIRC
LIMIT
PRES SWITCH
FLAME

24 VAC control circuits
water temp sensor

85051

Part number 550-141-850/0699

120 VAC H
Black

White

120 VAC to igniter

120 VAC N

24 VAC from transformer
24 VAC from transformer

120 VAC to igniter

GOLD GV Water boiler series 3 — manual

XIf

Troubleshooting — common problems

Symptom

Common Causes

Possible Corrections

Rapid cycling — boiler
turns on and off frequently

Thermostat installed where drafts
or heat affect reading

Locate thermostat on inner wall away from
heat sources or cool drafts.

Heat anticipator in thermostat
adjusted incorrectly

Adjust thermostat per manufacturer’s
instructions.

Incorrect limit setting

Set limit according to system needs.
Maximum setting is 220˚F. Increase limit
setting to decrease cycling.

Insufficient water flow through
boiler

Check all valves to and from boiler. Return
to proper setting.

Confirm circulator size.

Expansion tank sized too small

Call qualified service technician to check
expansion tank operation and size.

Flooded expansion tank

Call qualified service technician to check
expansion tank operation.

Inoperative limit control

Call qualified service technician to replace
limit control.

Need to frequently add
makeup water

Leaks in boiler or piping

Have qualified service technician repair
leaks at once to avoid constant use of
makeup water. Makeup water can cause
mineral deposits which, in turn, can cause
boiler section failure. Do not use petroleumbase stop-leak compounds.

Black water condition

Oxygen corrosion due to leaks in
boiler and piping

Have qualified service technician repair at
once. Keep pH of water between 7.0 to 8.5.

Frequent release of water
through relief valve

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Symptom

Common Causes

Possible Corrections

Popping or percolating
noise heard in boiler

Mineral deposits in sections due to
constant use of makeup water

Call qualified service technician to de-lime
boiler, if necessary. In some cases,
deposits will be too heavy to remove with
de-liming procedures.
Have qualified service technician repair
leaks to eliminate need for constant
makeup water.

Incorrect pH of boiler water

Call qualified service technician to check
pH level and correct. pH should be
maintained between 7.0 to 8.5.

Insufficient water flow through
boiler

Check all valves to and from boiler. Return
to proper setting.
Confirm circulator size.

Metal flakes found in vent
outlet or vent starter tee —
flueway corrosion

Contaminated combustion air
supply — See manual page 13.

Remove any contaminating products, see
manual page 13.
Provide outside air for combustion. Kit
available through Weil-McLain distributor.
Have qualified service technician pipe-up
kit.

Some radiators or
baseboard units do not
heat or are noisy

Condensation of combustion
gases in boiler sections

Have qualified service technician check
operation of mixing system. Repair/replace
if necessary.

Air in system

Bleed air from system through air vents in
radiators or baseboard units.

Low system pressure

Fill to correct pressure.
Check for leaks in boiler or piping. Have
qualified service technician repair at once.

High limit set too low

Part number 550-141-850/0699

Adjust high limit to higher setting.

GOLD GV Water boiler series 3 — manual

XIg

Troubleshooting — GCM lights
CHART 1 — Troubleshooting POWER light status

Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.

Is POWER light off?
No

• Make sure service switch or circuit breaker is on or fuses
are good.
• Remove 120 VAC IN plug (Figure 34, Item 1) on control
module.
• Using voltmeter, check across top and bottom pins of
120 VAC IN receptacle.

Yes

Is POWER light...
Flashing
alone

Flashing with
another light

On steady
(not flashing)

TSTAT CIRC
light flashing

Chart 2

Chart 6

LIMIT
light flashing

Chart 3

Chart 7

PRES SWITCH
light flashing

Chart 4

FLAME
light flashing

Chart 5

Yes

Problem is with incoming
electricity. Have licensed
electrician repair circuit.

• Reconnect 120 VAC IN plug.
• Remove 120 VAC transformer PRIMARY plug (Figure
34, Item 2) on control module.
• Using voltmeter, check across top and bottom pins of
PRIMARY receptacle.

For insufficient heat or no heat problem, go to
Chart 8 if POWER light is on steady, with no other
light flashing.

• Usually indicates polarity on incoming 120 VAC power
line is wrong.
• ▲TURN OFF POWER▲ at service switch or breaker,
then reverse the HOT and NEUTRAL wires entering the
boiler in the J-box.
• Restore POWER at service switch or breaker.

Is POWER light flashing now?
No

Does voltmeter indicate 120 VAC?

Yes

Does voltmeter indicate 120 VAC?
No

Yes

Replace control module.
Retest.

• Reinstall 120 VAC transformer PRIMARY plug.
• Remove 24 VAC transformer plug (Figure 34, Item 7) on
control module.
• Using voltmeter, check across pins of receptacle.

Does voltmeter indicate 24 VAC?
No

Boiler should now
operate normally.

Have system checked by a
licensed electrician.
If problem persists, call your
local Weil-McLain sales
representative.

Replace transformer.
Retest.

Yes

Replace control module.
Retest.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

CHART 2 — TSTAT CIRC & POWER lights flashing
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.

Is return water temperature sensor clamped
securely to the return pipe in the boiler?
Yes

• Attach sensor to pipe with clamp provided.
• If problem persists, replace return water temperature
sensor.
• Retest.

• Check for stray voltage on the incoming thermostat wires.
does occur under any condition, check and correct the
Disconnect the two external wires connected to the boiler
external wiring. (This is a common problem when using 3-wire
thermostat wires.
zone valves.)
• Connect a voltmeter across the two incoming wires. Close • Once the external thermostat circuit wiring is checked and
each thermostat, zone valve and relay in the external circuit
corrected if necessary, reconnect the external thermostat
one at a time and check the voltmeter reading across the
circuit wires to the boiler thermostat wires and allow the boiler
wires. There should NEVER be a voltage reading. If a voltage
to cycle.
Did you find and correct a voltage across the two external thermostat circuit wires?
Yes

• Boiler should now operate per the normal sequence of
operation shown in Figure 22 if wiring was corrected.

Is boiler internal Bypass circulator operating?
No

• Remove CIRCULATORS plug (Figure 34, Item 4) from
plug receptacle of control module.
• Place voltmeter leads across the right-side 120 VAC N
and 120 VAC H pins of the CIRCULATORS receptacle.

Does the voltmeter indicate 120 VAC?
No

Yes

• Replace GCM (control
module).

• Test wire continuity of
circulator wire harness.

• Retest.

Yes

• Replace circulator
harness.
• Retest.

• Reconnect circulator harness to GCM.
• Attempt to get the circulator started by giving it a sharp
rap on the end of the circulator motor (to release a
possibly locked impeller).
• If the circulator begins to operate, allow it to operate for a
few minutes to see if the problem clears.
• If problem persists, replace the Bypass circulator.

Part number 550-141-850/0699

• Check the boiler internal return pipe where it enters the
boiler sections. The TSTAT CIRC and POWER lights will
flash as long as the return water temperature is less than
130 ˚F.
• Wait up to 20 minutes to give the boiler and system a
chance to respond.
Does problem persist?

Is harness ok?
No

• Retest.

Yes

• Boiler may now be operating
normally. Verify against
Figure 22, sequence of
operation.

• If boiler appears not to be heating, troubleshoot boiler per
CHART 8 (no heat problems). If problem cannot be
resolved, replace water temperature sensor and retest.
Then replace GCM (control module) if sensor does not
correct the problem.
• If boiler is heating, but the temperature at the return pipe
does not increase above 130 ˚F, there may be an
incorrectly-piped external circulator forcing water through
the boiler. Check external piping and correct.

GOLD GV Water boiler series 3 — manual

XIg

Troubleshooting — GCM lights (continued)
CHART 3 — LIMIT & POWER lights flashing

Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.

• This is a lockout condition. The return water temperature
sensor has signaled a temperature higher than 240 ˚F, but
the boiler limit circuit is closed (indicating that the limit

•
•
•
•

control circuit did not catch the over-temperature condition).
This is probably an indication of a failure of the boiler limit
control and possibly the block temperature switch as well.

▲TURN OFF POWER▲ to boiler at 120 VAC service switch.
Remove CONTROL CIRCUIT plug from control module receptacle (Figure 34, Item 5).
Remove a wire from one of the limit control spade connectors.
Connect an ohmmeter across the left and right pins on the center row of the limit circuit harness.

Does the ohmmeter indicate a shorted wire harness (zero ohms)?
Yes

• Replace control wiring harness.
• Retest.

• Reconnect CONTROL CIRCUIT plug to control module.
• Remove WATER TEMP SENSOR plug from control
module receptacle (Figure 34, Item 6).
• Connector an ohmmeter across the plug pins to check
the sensor resistance.

Does the ohmmeter indicate a shorted sensor (zero ohms)?
• Replace water temp sensor.
• Retest.

Yes

Is boiler hot?
Yes

• Close the external manual gas valve.
• Remove one wire from the limit control
space connector.
• Set a thermostat to call for heat. Then
turn on power to the boiler at the 120
VAC service switch.
• The boiler system circulator should come
on and the control module should try to
cycle the boiler.
• Allow the boiler circulator to run to cool
off boiler and system water.
• After the boiler and system water have
cooled, turn off power at the 120 VAC
service switch and open the external
manual gas valve.

• Set limit control knob to its minimum setting. Replace wire
to limit control spade connector.
• Set a thermostat to call for heat.
• Turn on power at 120 VAC service switch.
• Control module should cycle boiler on and begin heating.
• The limit control should shut off the gas valve when the
temperature at the boiler pressure/temperature gauge
has reached no more than about 20 ˚F higher than the
limit switch setting.

Does limit control shut off gas correctly?
Yes

• Replace control
module.
• Retest.

• Replace limit control
and block temperature switch.
• Retest.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

CHART 4 — PRES SWITCH & POWER lights flashing
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.

• Reset boiler control by turning off power at service switch or turning down thermostat for at least 45 seconds.
• Thermostat should call for heat and appropriate zone valves open.

Does blower motor operate?
No

Yes

Does blower motor operate?
No
Yes

Is blower wheel turning at speed of blower motor?

Wait 45 seconds.

No
• Remove BLOWER plug (Figure 34, Item 3) from plug
receptacle of control module.
• Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the BLOWER receptacle.

Does the voltmeter indicate 120 VAC?
No
Yes
▲TURN OFF POWER▲ at service switch.

Does blower wheel turn freely by hand?
No
Yes

Properly position
blower wheel on
blower motor shaft
and tighten set screw.
(Or replace blower
housing assembly.)
Retest.

Replace blower
motor. (Also check
blower housing
assembly. Replace if
necessary.)
Retest.

• Remove one of the red wires connected to the pressure
switch.
• Check continuity across the switch terminals.

Does the ohmmeter indicate the switch is closed?
No
Yes

Replace control module.
Retest.

▲TURN OFF POWER▲ at
service switch.
• Properly position blower
wheel on blower motor
Wait 5 minutes.
shaft and tighten set
screw. (Or replace blower
Is purge light flashing?
housing assembly.)
No
Yes
• Retest.

Boiler should be in normal operating
sequence.
Observe operation until thermostat is
satisfied and blower has completed its postpurge cycle.

Check condensate trap. Is there condensate present?
No

Yes

Are vent or combustion air
passages blocked?
No

Check air pressure switch per manual Section XI.
Replace if necessary. Retest.

Part number 550-141-850/0699

Yes

Drain condensate.
Retest.

Yes

Clear passages and recycle boiler.
Recheck boiler operation.

GOLD GV Water boiler series 3 — manual

XIg

Troubleshooting — GCM lights (continued)
CHART 5 — FLAME & POWER lights flashing

Are manual main shutoff valve and gas valve turned on?
No

• Open manual gas valve.
• Restart boiler, following Lighting instructions for gas
valve installed on boiler (Figure 25 or 26).
• Check for proper operation (per Sequence of operation,
Figure 22).

Yes

• Check gas valve harness wires and check for tight wiring
connections on gas valve and control module. Repair/
replace as necessary.
• Recycle boiler by thermostat or service switch (holding
power off for at least 45 seconds).
• Thermostat should call for heat and appropriate zone
valves close.

During step 5 of sequence of operation (Figure 22),
is there 24 VAC across gas valve terminals?
Replace control module.
Retest.

Yes

• Check and/or replace igniter.
• Recycle boiler by thermostat or service switch.
Thermostat should call for heat and appropriate zone
valves close.
• Wait 5 minutes.
• Boiler should now operate normally.
• Original flashing FLAME light caused by igniter not
operating properly.
• See normal sequence of operation, Figure 22.

Are FLAME & POWER lights flashing?
No
Yes

• Check and/or replace gas valve.
• Recycle boiler by thermostat or service switch.
Thermostat should call for heat and appropriate zone
valves close.
• Wait 5 minutes.

Are FLAME & POWER lights flashing?
No
Yes
• Boiler should now operate normally.
• Original flashing FLAME light caused by gas valve not
operating properly.
• See normal sequence of operation, Figure 22.

Call your local Weil-McLain
sales representative.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

CHART 6 — TSTAT CIRC light flashing and POWER light on steady
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.
• This is not a lockout mode. The control module is signaling that the return water temperature sensor is detecting a temperature
less than 40 ˚F.
• While the temperature at the boiler return water temperaure sensor is less than 40 ˚F, both of the internal boiler circulators will
run continuously, even if there is no call for heat (though the boiler will not fire until the thermostat calls for heat). This operation
is intended to reduce chances of freezing during system down times by keeping water flowing.

Is return water temperature sensor clamped
securely to the return pipe in the boiler?

• Attach sensor to pipe
with clamp provided.

Yes

• If problem persists,
replace return water
temperature sensor.
• Retest.

Are both boiler internal circulators operating?
No

• Remove CIRCULATORS plug (Figure 34, Item 4) from
plug receptacle of control module.
• Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the CIRCULATORS receptacle on the
side corresponding to the circulator not operating.

Does the voltmeter indicate 120 VAC?
No

Yes

• Replace GCM (control
module).

• Test wire continuity of
circulator wire harness.

• Retest.

Is harness ok?
No

Yes

• Replace circulator
harness.
• Retest.

Yes

Is there a call for heat?
(Verify by removing thermostat wirings at boiler and
checking continuity across external wires)
No
Yes

• This is normal
operation for water less
than 40 ˚F at boiler
internal return pipe.

• Wait 10 minutes to
allow heat from the
boiler to raise the water
temperature.

• Condition should
change after a call for
heat, when the boiler
will heat up the water.

Does LIMIT light quit
flashing (and pipes begin
to heat up)?
No

• Reconnect circulator harness to GCM.

• Boiler is not heating.

• Attempt to get the circulator started by giving it a sharp
rap on the end of the circulator motor (to release a
possibly locked impeller).

• Troubleshoot boiler
using CHART 8.

Yes

• If the circulator begins to operate, allow it to operate for a
few minutes to see if the problem clears.
• If problem persists, replace the bypass circulator.

• Boiler should now operate normally.

• Retest.

• Verify correct sequence of operation using Figure 22.

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIg

Troubleshooting — GCM lights (continued)
CHART 7 — LIMIT light flashing and POWER light on steady

Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.

• This is not a lockout mode. The control module should only be signaling that the water temperature sensor is either shorted or
there is an open circuit across the sensor terminals..
• This situation is usually corrected by replacing the sensor, as described below.

• Remove SENSOR plug from receptacle on GCM (Figure 34, Item
6). Then re-insert.

Does LIMIT light still flash?
No

Yes

• Replace sensor and harness.

Does LIMIT light still flash?
No

Yes

• Boiler may now be operating correctly. Verify per normal
sequnce of operation in Figure 22.

• Replace GCM (control module).
• Retest.

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

CHART 8 — Insufficient heat or no heat to system (POWER light on steady)
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.
• Has it been at least 5 minutes since setting thermostat to
call for heat? If not, wait 5 minutes. Is system heating?
• Is thermostat set to call for heat? Remove thermostat
wires at boiler and check continuity across the two wires.
If circuit isn't closed, check external thermostat (zone
valve, relay, etc.) wiring. Correct problems and retry.
• Reconnect external thermostat wiring at boiler.

Is thermostat circuit closed (continuity across wires)?
No

Yes

Are all red lights off?
No

Yes

Wait 30 seconds.
Are all red lights off?
No

• Boiler is in standby.
• Set thermostat to call for heat
and recheck operation.
• Verify Sequence of operation,
Figure 22.

Yes

• Remove CIRCULATORS harness plug from
CIRCULATORS plug receptacle (Figure 34, Item
4). Check with voltmeter across left-side 120 VAC
N and 120 VAC H pins of receptacle.
Does voltmeter show 120 VAC across pins?
No

Yes

• Replace control
module.
• Retest.

• Repair/replace
circulator. Retest.
• Repair/replace
wiring. Retest.

• Wait 5 minutes.

Yes

Is FLAME light on?
No

Replace control module.
Retest.
• Check block switch on top of boiler with continuity
checker.

Are block switch contacts closed?
No
Yes

• Wait for cast iron block to
cool to room temperature.

• Check limit switch
contacts with continuity
checker.

Are block switch
contacts closed?
No

Is boiler System circulator operating?

Yes

Are limit switch
contacts closed?
Yes
No

Yes

• If you have sufficient heat — boiler should be in normal
operating sequence. (See normal sequence of operation,
Figure 22.)
• If you have less than sufficient heat —

Is vent or combustion air piping free of blockage?
No
Yes
• Correct conditions and
recheck operation.
• See Figure 22 for
normal sequence of
operation.

Contact your Weil-McLain
sales representative.

• Wait for boiler water to cool to temperature 20 to 30 ˚F
lower than temperature set on limit switch.
Replace block
switch. Retest.

Replace control
module. Retest.

Replace limit
switch. Retest.

• Excessive block temperature has been reduced to safe
operating level. Check for low water level or mineral
deposits in sections. Correct before proceeding.
• Restart boiler and check normal sequence of operation.
(See normal sequence of operation, Figure 22.)

Part number 550-141-850/0699

Are limit switch contacts closed?
No
Yes
• Boiler water temperature exceeded setting on limit switch
with thermostat calling for heat. Boiler is OK. (See normal
sequence of operation, Figure 22.)
• Also check operation of setting on limit switch (should be
above 140˚F.).

GOLD GV Water boiler series 3 — manual

XIIa

Replacement parts — overview
❏ Accessory bag assembly (shipped with boiler)
❏ Section assembly (boiler sections, tie rods, base rail legs, blower support bracket, block
temperature switch)
❏ Jacket assembly (jacket parts)
❏ Blower assembly (blower, motor, air inlet hose and fittings, condensate trap parts, igniter,
gas valve, gas/air orifice and manifold, burner and gasket)
❏ Trim assembly (circulators, piping components, limit control, P/T gauge, relief valve, drain
valve)
❏ Interior panel (jacket interior panel, transformer, GCM control module, air pressure switch)

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

XIIb

Replacement parts — accessory bag
Table 5

The parts below are shipped with the boiler in the accessory bag.

Item
Description
number
1

Water trim bag assembly #2

Weil-McLain
part number

Quantity Remarks

542-200-309

Nipple, BK 1 x 3.00

561-326-405
561-326-515

1
1

Relief valve thru jacket
Tee to tee — Series 2
Tee to cross — Series 3

Tee, BK 1 x 1 x ½

561-541-216

To mount pressure/temp gauge

Water trim bag assembly #1

542-200-308

Bushing, BK C1 ½ x ¼

560-807-366
Screw, sheet metal type A pan
562-138-550
head phil— 10 x .50 BK Phosphate

Tee to gauge

Jacket back panel

Bag, plastic 4.00 x 6.00 x .004

540-202-749

Contains items 6 & 7
Contains items 1, 2, 3, 4 & 5

Nipple, BK ¾ x 3.00

Bag, plastic 4.00 x 6.00 x .004

540-202-749

Gauge, pressure/temperature 2 ½" short
shank
U.S. Gauge/Ametek 199994 (unipak) or
U.S. Gauge/Ametek 199996 (bulk) or
ENFN. 4104-2-2-½-¼-CBN

510-218-099

Valve, relief ¾ 30 PSI
Watts ¾ W330-HI 030

511-546-920

Water trim bag assembly #3
Exhaust, tube spacer

542-200-310

560-907-642

13
14

Screw, sheet metal type A pan head
phil — 10 x .50 BK Phosphate

562-138-550

Washer, lock #10 external tooth type A 562-248-680
Screw, sheet metal type A pan head
562-150-248
slotted — 10 x 1.25 ZP

For intake/exhaust plates

Plastic anchors

563-210-627

For #10 screws

Bag, plastic 4.00 x 6.00 x .004

540-202-749

Contains items 13, 14, 15, 16 & 17

Cap to cap mounting plate

Intake/exhaust air, cap plastic

560-907-641

Intake/exhaust air, mounting plate

452-100-160

Intake/exhaust air, backing plate

452-100-163

Hole template

550-108-065

Vent instruction sheet (Vent/Air Intake
Termination)

550-141-778

Drain bracket assembly

542-200-300

Label, Accessory bag

550-225-031

Insert so text is visible from outside
of bag (0299)

Bag, plastic 16.00 x 18.00 x .006

540-202-752

Contains items 1, 10, 11, 12, 19,
20, 21, 22, 23, 24 & 25

Part number 550-141-850/0699

(1196)

GOLD GV Water boiler series 3 — manual

XIIc
Table 6

Replacement parts — section assembly

Section assembly

Item
Description
number
1

Weil-McLain
part number

Block assembly, includes:
Front section, intermediate section, back section, square cut seals — 2",
silicone sealant, tie rods, tie rod nuts, tie rod washers, water tubing male
adapters — 1" NPT, water tubing, pump to return, blower flange gasket,
igniter, igniter gasket, screws, lock washers, studs, nuts

322-200-280

322-200-281

322-200-282

322-200-283

Front section
Also requires repair parts kit consisting of: Square cut seals — 2", silicone sealant, tie rod nuts, tie rod washers, water tubing, male adapters
— 1" NPT, water tubing, pump to return, blower flange gasket, igniter,
igniter gasket, screws, studs, nuts, lock washers

All

312-200-150
382-200-300

Intermediate section
Also requires repair parts kit consisting of: Square cut seals — 2", silicone sealant, tie rod nuts, tie rod washers

All

312-200-110
382-200-305

Back section
Also requires repair parts kit consisting of: Square cut seals — 2", silicone sealant, tie rod nuts, tie rod washers

All

312-200-130
382-200-305

Tie rods

560-234-499

560-234-525

560-234-503

560-234-504

3&4

452-100-170

5&6

452-100-172

Model

Base rail legs

Base rail brace

All

452-100-080

Blower housing support

All

452-100-111

Block temperature limit switch

All

510-350-068

Inspection port cover

All

560-907-629

Inspection port gasket

All

590-317-628

Starter tee gasket

All

590-317-629

Stud, ⁵⁄₁₆" - 18 x 1.25

All

560-340-581

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 35

Section assembly

85041

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIId
Table 7

Item
number

Replacement parts — jacket assembly

Jacket assembly

Description

Jacket panel, top

Jacket panel, front

Jacket panel , left side

Jacket access panel

Jacket panel, right side

Model

Weil-McLain
part number

3&4

422-200-146

5&6

422-200-150

All

422-200-140

3&4

422-200-220

5&6

422-200-222

All

422-200-230

3&4

422-200-224

5&6

422-200-226

Jacket panel, rear

All

422-200-135

Top rail brace

All

422-200-232

Top rail cross tie

All

422-200-137

Jacket panel, interior

All

422-200-228

Base rail assembly (see Section assembly on page 84 for details)

---

--------------

Screw, sheet metal type AB, serated hex washer head Phillips #10 x ³⁄₈"
steel black phospate

All

562-150-273

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 36

Jacket assembly

85042

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIIe
Table 8

Replacement parts — Blower assembly

Blower assembly

Item
number

Description

Burner replacement kit, includes:
Burner cone and ring assembly, blower flange gasket, igniter, igniter screws,
igniter washers, igniter gasket

2
3
4

Blower flange gasket
Air pressure switch (0 to 5,500 feet elevation)
Blower motor replacement kit, includes:
Blower motor, motor mount grommets, screws, lock nuts, 9" Allen wrench
Blower housing assembly replacement kit, includes:
Blower housing, observation port window, blower housing cover plate, blower
motor mounting brackets, washer hold down bracket, lock nuts, motor mount
grommets, blower motor, blower wheel, magnetic washer, silicone sealant,
screws, blower flange gasket, igniter, igniter screws, igniter washers, igniter
gasket
Conversion kit, natural to propane, includes . . . . . . . . . . . . . . . . . . . . . .
Propane orifice plate, label

Conversion kit, propane to natural, includes . . . . . . . . . . . . . . . . . . . . . .
Propane orifice plate, label

7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

Gas/air manifold assembly, includes:
Gas/air manifold, gas tubing, washers, screws
Condensate trap kit, includes:
Condensate trap, hoses
Gas valve tubing to gas/air manifold, red
Gas valve assembly replacement kit, includes:
Gas valve, gas supply manifold and bracket
Gas manifold assembly, includes:
Gas supply manifold, bracket
Igniter replacement kit (includes gasket)
Igniter gasket (included in item 12, above)
Inlet air fitting
Hose clamp, 3"
Inlet air hose
Inspection port cover
Inspection port gasket
Starter tee gasket
Drain hose clamp, 5/8”
Condensate trap hose
Drain bracket
Drain ell

Model

Weil-McLain
part number

3
4
5
6
All
All
All

382-200-320
382-200-325
382-200-330
382-200-335
590-317-610
511-624-520
382-200-345

All

382-200-340

3
4
5
6
3
4
5
6
All

510-811-600
510-811-605
510-811-610
510-811-615
510-811-620
510-811-625
510-811-630
510-811-635
382-200-355

All

382-200-409

All
All

590-317-647
382-200-410

All

591-126-800

All
—
All
All
All
All
All
All
All
All
All
All

511-330-148
—
560-907-635
591-850-068
562-302-547
560-907-629
590-317-628
590-317-629
591-850-071
562-302-548
452-100-112
560-907-650

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 37

Blower assembly

Vent starter
tee — not
included

85043

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIIf
Table 9

Replacement parts — trim assembly

Trim assembly

Item
Description
number

Weil-McLain
part number

Circulator flange, 1" NPT

563-910-026

Circulator gasket, Taco 110-339

System circulator, Taco 007F

590-317-543
511-405-113

Bypass circulator, Taco 007F

511-405-113

Wiring harness, dual circulators to control module

591-391-824

Nipple, NPT — 1" x close

561-326-500

Ell, 1"

563-115-300

Nipple, NPT — 1" x 4 ½"

561-326-528

Tee, 1"

561-541-212

Nipple, NPT — 1" x close

561-326-500

Nipple, NPT — 1" x close

561-326-500

561-550-000

Cross, 1"
Bushing, 1" x ¹⁄₈"

Vent coin, ¹⁄₈" NPT

510-148-565

Nipple, NPT — 1" x 4"

561-326-527

Reducing tee, 1" x 1" x ½"

561-541-216

Bushing, ½" x ¼"

560-807-366

Combination pressure-temperature gauge, 2 ½" short shank

510-218-099

Nipple, NPT — 1" x 4"

561-326-527

ASME Pressure relief valve, ¾" male inlet, 30 PSIG

511-546-920

Nipple, NPT — ¾" x 3"

561-326-405

Block temperature limit switch

510-350-068

Limit control

510-312-244

Limit control well, ½"

Included with limit

Return pipe section

560-742-938

Drain valve, ¾"

511-246-392

Inspection port cover

560-907-629

Starter tee gasket

590-317-629

Water temperature sensor and clamp

511-330-089

Inspection port cover gasket

590-317-628

560-807-378

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Trim assembly
SYST
EM

Figure 38

85048

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIIg
Table 10

Replacement parts — interior panel

Interior panel

Item
Description
number

Weil-McLain
part number

Interior panel with controls

542-200-302

Control module assembly, includes control module and screws

542-200-235

Transformer

511-842-370

Air pressure switch

511-624-520

Wiring harness, control module to junction box (not shown)

591-391-821

Wiring harness, control module to hot surface ignitor (not shown)

591-391-819

Wiring harness, control module to system and bypass circulators (not shown)

591-391-824

Wiring harness, control module to controls (not shown)

591-391-892

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Figure 39

Interior panel

85046

Part number 550-141-850/0699

GOLD GV Water boiler series 3 — manual

XIII
Figure 40

Dimensions and ratings

Dimension drawing (see dimension table on opposite page)

85049

Item
number
1
2
3
4
5
6
7
8
9
10
11
12
13

Description
1" NPT Supply
1" NPT Return
Combination pressure-temperature gauge, 2 ½" short shank
¾" NPT Relief valve outlet
Plug dome, 2" black
Junction box
Inlet air fitting
3" Diameter flue outlet
½" Condensate drain
½" NPT Gas supply connection (provided by others)
Drip leg (provided by others)
Union (provided by others)
Manual main shutoff gas valve (provided by others)

Part number 550-141-850/0699

• Installation • Start-Up • Parts • Maintenance

Table 11
Boiler
model

Boiler dimensional data (see Figure 40)
Supply

Return

Length

Gas
connection
size (Note 1)

Crate dimensions
(outside measurement, inches)

Approx.
shipping
weight

(in. NPT)

(inches)

(in. NPT)

Length

Width

Height

(pounds)

GV–3

30¾

33½

270

GV–4

30¾

33½

320

GV–5

37¾

33½

355

GV–6

37¾

33½

410

Note 1 Gas piping from meter to boiler to be sized per local utility requirements.

Table 12

Boiler
model
number

Boiler ratings

AGA Input
Btuh

DOE Heating Net I=B=R
capacity Btuh ratings Btuh
(Note 1)
(Note 2)

DOE
Vent/combustion Boiler water
Seasonal
air diameter
content
efficiency (%) (inches)
(gallons)

GV-3

70,000

61,000

53,000

87.5

3.3

GV-4

105,000

92,000

80,000

87.3

4.2

GV-5

140,000

122,000

106,000

87.2

5.1

GV-6

175,000

153,000

133,000

87.0

6.0

Notes:
1. Based on standard test procedures prescribed by the United States Department of Energy. Ratings also referred to as AGA/
CGA Output.
2. Net I=B=R ratings are based on net installed radiation of sufficient quantity for the requirements of the building and nothing
need be added for normal piping and pickup. Ratings are based on a piping and pickup allowance of 1.15. An additional
allowance should be made for unusual piping and pickup loads.
Boilers are tested for 50 lbs working pressure. GV boilers are not available for millivolt systems.

Part number 550-141-850/0699

GOLD GV W
ater boiler — Series 3
Water

Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
96

Part number 550-141-850/0699

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Title                           : 550-141-850/0699
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Subject                         : GOLD GV Series 3 Boiler Manual
Modify Date                     : 1999:07:28 10:11:37-05:00
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