Weil Mclain Egh 105 Users Manual 110 677.p65

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EGH

Gas-Fired Boiler

Control Supplement
EGH-105 to EGH-125 Series 4
Natural gas‡
CSD-1 control system

‡ For propane boilers, install EGH propane conversion kit in addition to following the
instructions in this Control Supplement.
Part No. 550-110-677/0299

EGH-105 to EGH-125

Control Supplement

Please read this page first
Hazard definitions

The following terms are used throughout this Control Supplement 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.

To the installer:

This Control Supplement must only be used by a qualified installer/service
technician. Read these instructions completely before beginning the
installation. Failure to follow these instructions can cause severe personal
injury, death or substantial property damage.
This Control Supplement is for CSD-1 controls on EGH-105 to EGH-125
boilers only, specifically for:
•

Water boilers without tankless heater. (CSD-1 is not available for
water boilers with tankless heater.)

•

Steam boilers with or without tankless heater.

This document is only intended as a supplement to the EG, PEG and EGH
(Series 4) Boiler Manual (referred to in this Supplement as the EGH Manual).
Follow all instructions in the EGH Manual in addition to the instructions in
this Control Supplement.
The installation must conform to the requirements of the authority having
jurisdiction, or, in the absence of such requirements, to the National Fuel Gas
Code, ANSI Z-223.1/NFPA-54 (latest edition). Where required by the authority
having jurisdiction the installation must conform to the American Society of
Mechanical Engineers (ASME) Safety Code for Controls and Safety Devices
for Automatically-Fired Boilers, Number CSD-1.

Contents

I. .................

Installation .......................................................................... 4

II. ................

Piping connections ............................................................. 6

III. ...............

Install boiler controls ......................................................... 6

IV. ...............

Optional heaters ................................................................ 7

V. ................

Gas piping ........................................................................... 8

VI. ..............

Wiring .................................................................................. 8

VII. .............

Final adjustments ............................................................. 22

VIII. ............

Check-out procedure ....................................................... 24

IX. ..............

Service and maintenance ................................................ 31

X. ...............

Replacement parts ........................................................... 32
Part Number 550-110-677/0299

CSD-1 control system — Natural gas

Carton guide
Table 1 Boiler cartons
Verify that the correct cartons are available before beginning assembly. Note that the Base assembly and Trim &
controls cartons for CSD-1 are special. The CSD-1 ignition control panel (in Base assembly carton) consists of ignition
control module, impulse relay and lighted push-button switch mounted and wired on a panel base.

Carton

Comments

EGH-105

EGH-115

EGH-125

With tankless opening

321-711-120

321-711-130

321-711-140

Without tankless opening

321-711-125

321-711-135

321-711-145

CSD-1

381-700-400

381-700-402

381-700-404

Base panels

381-700-250

381-700-255

381-700-260

Jacket

411-800-280

411-800-290

411-800-300

Collector hood

450-014-752

450-014-753

450-014-754

Draft hood

450-206-242

450-206-243

450-206-244

Gravity return (M&M #67W-1)

381-700-341

Pumped return (M&M #42-A)

511-114-531

381-800-446

381-800-447

Steam boilers only

386-700-350

Water, CSD-1 — or —

381-700-406

Steam, CSD-1, gravity return — or —

381-700-408

Steam, CSD-1, pumped return

381-700-410

Section assembly (a)
Base assembly (b)

Float low water cutoff (steam)
Vent damper (optional) (c)
Tankless heater (optional)

Trim & controls (see below)

Note a — CSD-1 water boilers cannot be equipped with a tankless heater.
Note b — Base assembly includes burner tubes, gas train components, pilot assembly and control panel (with ignition control).
Note c — EGH vent dampers meet ASME CSD-1 requirements (paragraph CF-210(c)) because they comply with ANSI Z21.13.

Steam trim and control carton
Gravity return

Steam trim and control carton
Pumped return

Water trim carton

Pressure limit control, automatic reset

Aquastat, automatic reset

Pressure limit control, manual reset

Aquastat, manual reset

Probe low water cutoff, manual reset

Transformer/relay

Wire harness, steam gravity return

Wire harness, steam pumped return

Wire harness, water

Crimp spade wire terminations

ASME Relief valve

Pressure gauge

Gauge glass and valves

Brass cross, brass nipple, bushings (3) and
siphons (3) for mounting pressure controls
and gauge

Brass cross, brass nipple, bushings (3)
and siphons (3) for mounting pressure
controls and gauge

Part Number 550-110-677/0299

Pressure/temperature gauge

EGH-105 to EGH-125

Control Supplement

Installation

Place the boiler

Refer to the EGH Manual. Read Section I and follow all of its guidelines. Complete the
following steps of Section I of the EGH Manual:
• Placing the boiler
• Installation of optional water heaters, steam boilers only (including pages 13–14)
• Hydrostatic pressure test
• Installation of flue collector hood
• Installation of (burner) drawer assembly and front access panel and back base channel
• Jacket installation
• Draft hood installation

Install gas train

Connect gas train assembly to burner manifold:
• Apply pipe dope to 1" nipple for insertion into burner manifold coupling (Figure 1,
item 1). Insert and tighten nipple.
• Pipe lower half of ground joint union to the 1” nipple (Figure 1, item 2).
• Knock out the jacket gas valve opening on the desired side of the boiler (may be routed
through either right or left side).
• Place gas train in position (either routed to the left, as shown, or to the right) and tighten
the ground joint union loosely. Position the gas train assembly and tighten the union.
• Connect vent lines (routed to outside per code requirements) to ¼" tubing vent
connections on main gas valve and pilot gas pressure regulator (Figure 3, item 3).
• Connect pilot gas tubing (1/8" aluminum) to adapter in pilot gas valve outlet
(Figure 1, item 4).
• Crimp connect two ¼" spade terminals (provided) to ends of pilot gas valve wires
(Figure 1, item 5).

Install vent/breeching

Install vent system and breeching per EGH Manual Section I. If optional vent damper is used,
install vent damper (using Section I of this Supplement) before installing breeching.

Figure 1
Gas train assembly

1
4
3
677-09

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

Install optional vent damper (if supplied)
If not installing a vent damper, proceed to next section
(Piping connections).

and actuator wiring openings. Insert wires and secure
strain relief clamps. See Figure 6, 8, or 10 as applies.

Once a vent damper has been
operated on an EGH boiler, the boiler
will no longer operate without a
damper installed.

Keep wiring harnesses clear of all hot
surfaces.

WARNING

Only dampers listed in the
Replacement parts list in this
Supplement are certified for use with
EGH Series 4 boilers. Any other
damper installed could cause severe
personal injury or death.

LINE UP KEYWAY WHEN
CONNECTING PLUGS.
FORCING A MISMATCH
CAN CAUSE A
HAZARDOUS CONDITION.

Minimum clearances — Provide a minimum of 6" between
the damper and any combustible material. (Provide a
minimum of 46" between EGH jacket top and a
combustible ceiling.)
Damper must be installed directly on
top of draft hood so that it serves
only that boiler. DO NOT modify
draft hood or damper, or make
another connection between draft
hood and damper or boiler. This will
void AGA/CGA certification and will
not be covered by Weil-McLain
warranty. Any changes will cause
severe personal injury, death or
substantial property damage.

Read and apply the harness plug warning label (above)
so that it is visible after installation.

Install damper directly on top of draft hood, with arrow
pointing straight up. Install so the damper blade indicator
is visible to the user. See Figure 2.

By-passing (jumpering) damper will
cause flue products such as carbon
monoxide to escape into the house.
This will cause severe personal injury
or death.

Keyway

After boiler has operated once, if
either end of harness is disconnected,
the system will shut down. The boiler
will not operate until the harness is
reconnected.

Install damper harness between damper actuator and
knockout in right top of boiler jacket. Knock out opening
in jacket top and install strain relief bushings in jacket

Vent damper assemblies

Effikal damper

Johnson Controls damper
Damper
blade
indicator

Hold-open switch (Effikal only) —
Install damper so that switch is
visible and accessible to user.

Part Number 550-110-677/0299

677-10

Remove dummy plug from damper connector in boiler
wiring harness. Plug damper harness receptacle into
damper harness plug. See Figure 6, 8, or 10 as applies.

Screws or rivets used to secure the damper to the vent
pipe and the draft hood must not interfere with rotation
of the damper blade.

Figure 2

Key

677-05

EGH-105 to EGH-125

Control Supplement

Piping connections
Connect steam (water) piping to the boiler per EGH Manual Section II.
Water boilers — make provision for mounting probe low water cutoff in the supply or return
piping, above the top of the boiler. The low water cutoff must be between the boiler and any
isolation valve(s).

III

Install boiler controls — water

boilers

The controls may be mounted on either end of the boiler. Mount all controls
on the same end. The junction box (electrical entrance) must also be mounted
on the same end as the controls.
Install the probe low water cutoff in the supply or return piping, above the
top of the boiler. The low water cutoff must be mounted between the boiler
and any isolation valve(s) installed in the piping.
Install water trim components as required by ASME CSD-1, latest edition. See Figure 3 and
Table 2 for controls required and tapping usage. See Figure 6 for finished assembly.
Plug all unused tappings.
All piping and control connections must also comply with the EGH Manual.

Figure 3

Table 2

Water boiler connections
11¾"

Water boiler connections
27 /8"
5

Tapping

Application

W-M Part No.

163/16"

Supply

L
S
32¾"

Not
used

H
V

165/8"

13½"

211/16"

Boiler drain connection

—

ASME relief valve (per EGH manual)

—

Pipe to air vent or compression tank

—

Honeywell L4006E-1000 M/R limit

510-312-041

Pressure/temperature gauge

510-218-097

Temperature limit control, auto reset

510-312-209

Gas supply connection (right or left)

—

McDonnell & Miller PS852M-24 M/R
Not shown probe LWCO (Mount in supply or
return piping, above top of boiler)

Return

24"

511-114-530

Plug all tappings not used.
677-08

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

III

Install boiler controls — steam

boilers

All water level controls must mount on the left end of the boiler. Failure to do
so could result in nuisance shutdowns and possible lockout on the manual
reset control due to water level variations from end to end. Substantial
property damage could result from freezing due to loss of heat.
All controls must mount on left end of the boiler. The correct tappings are
available only on the left end section.
Install steam trim components as required by CSD-1, latest edition. See Figure 4 and Table 3.
See also Figure 8 or Figure 10 for finished assembly.
•
•

CSD-1 requires two low water cutoffs (one manual reset) and two limit controls (one
manual reset) as shown in the illustration.
For float type (automatic reset only) low water cutoffs other than those shown in this
Supplement, refer to EGH Manual for mounting and piping instructions.
Install a blowdown valve on any float type low water cutoff as described in
the EGH Manual, Section III.

Plug all unused tappings.
All piping and control connections must also comply with the EGH Manual.

Optional heaters —

steam boilers only

Install optional tankless heater, if used, (steam boiler only) per EGH Manual Section IV.

Figure 4

Table 3

Steam boiler connections
11¾"

Steam boiler connections
27 /8"
5

Tapping

163/16"

T
E

Supply
risers

C
D
E
G

L
S
32¾"

C
2313/16 "
(Water line)

165/8"

H
D

13½"
Return

S
V

211/16"
24"

Part Number 550-110-677/0299

677-07

Application
McDonnell & Miller PS852M-24 M/R
probe LWCO
Not used — plug tapping
Drain connection (per EGH manual)
ASME relief valve (per EGH manual)
Not used - plug tapping
Float LWCO, automatic reset —
Gravity return — McD-M 67W-1
Pumped return — McD-M 42-A
Pressure gauge
Pressure limit, automatic reset
Honeywell L404C-1147 M/R limit
Skim tapping (per EGH manual)
Gas supply connection (right or left)
Plug all tappings not used.

W-M Part No.
511-114-530
—
—
—
—
—
511-114-494
511-114-531
510-218-045
510-312-135
510-312-060
510-312-209
—

EGH-105 to EGH-125

Gas piping
Size and connect gas supply piping per EGH Manual,
Section V.
The gas supply can enter from either the right or left
side of the jacket. Be sure the gas train is directed to the
correct side.

Support gas line securely. Do not
support weight of gas line off of boiler
gas train.
Purge air from gas piping and perform gas line and gas
connection leak test per Section V of the EGH Manual.

Wiring
For your safety, turn off electrical
power supply before making any
electrical connections to avoid
possible shock hazard.

Use 105 °C thermoplastic wire, or equivalent, if any
original wire must be replaced (except for pilot spark
and sense wires).

A strain relief bushing and adapter
must be used at each point where
wiring passes through the boiler
jacket or control cases to protect
wiring insulation.

Wiring procedure

Assembly illustrations and wiring
diagrams
This Supplement contains three wiring diagrams and
associated assembly illustrations. Refer to the
following, as applicable:
• Water boilers —Figures 5 and 6
• Steam boilers, gravity return — Figures 7 and 8
• Steam boilers, pumped return — Figures 9 and 10

General
Refer to EGH Manual, Section VI for further
information.
All wiring must be installed in accordance with the
requirements of the National Electrical Code and any
additional national, state or local code requirements
having jurisdiction. All line voltage wiring external to
boiler jacket must be N.E.C. class 1.
Provide a separate electrical circuit with a fused
disconnect switch (15 amp recommended) to supply
the boiler. Wiring to the boiler must be No. 14 gauge or
heavier, installed in conduit.
The boiler must be electrically grounded in accordance
with the National Electrical Code, ANSI/NFPA No. 70,
latest edition.

Control Supplement

1. Mount all controls as directed in Section III of this
Supplement. Refer to the assembly illustration for
the type of boiler installed (Figure 6, 8 or 10).
2. Mount the junction box supplied with the boiler on
the inside left (or right) side of the jacket as shown
in the assembly illustration (using screws and nuts
provided). Mount the junction box on the same
end of the boiler as the controls will be
mounted.

3. Attach the transformer/relay to the junction box.
4. Mount the CSD-1 control panel on the jacket
interior panel as shown in the appropriate
assembly illustration (Figure 6, 8 or 10), using
screws and nuts provided.
5. Crimp connect ¹⁄₄" spade terminals (provided) to
the pilot gas valve wires if not already done in
Section I of this Supplement.
6. If optional vent damper is installed, make sure
damper harness has been routed through a strain
relief bushing in the jacket and damper actuator as
directed in Section I of this Supplement. Secure
damper harness conduit to top of jacket with
clamps provided.
7. The main gas valve wires are pre-attached to the
CSD-1 control panel. The spark and sense wires
from the pilot are factory installed to the pilot.
Connect these wires as shown in the wiring
diagram.
8. Use the wiring harness provided with the boiler to
complete wiring of the remaining components
according to the appropriate wiring diagram and
assembly illustration.

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

Wiring — sequence of operation
General
The following sequence of operation applies to all wiring diagrams in this Supplement — both
water and steam.

Call for heat
On a call for heat (from thermostat or operating control):
1. Limit control and water level control contacts are assumed closed.
2. Vent damper (if provided) will open.
3. Ignition control checks for signal at pilot. (No signal should be present.)

If no signal is sensed (normal condition):
a.
b.
c.
d.

Pilot solenoid opens.
Pilot ignition spark begins.
Pilot ignites.
Pilot proves.

If a signal is sensed (abnormal condition) by the ignition control, the control will lockout.
On failure to establish pilot flame signal within 15 seconds, the ignition control
will turn off the pilot gas valve. It will wait 5 minutes, then retry for ignition.
If the second ignition attempt fails, the ignition control will lockout and
illuminate the red lockout light.
This will activate the alarm contact of the impulse relay, providing an isolated
contact closure across terminals A1 and A2 of the CSD-1 control panel
terminal strip. The contact rating is 15 amps at 250VAC.
To reset the boiler, push the red reset button on the CSD-1 control panel.
4. Once pilot is proved the ignition control activates main gas valve. Main burners will ignite
and boiler will continue to fire until terminated by limit action or no call for heat.

Lockout modes
In addition to lockout on flame-sense failure, the boiler may also experience lockout due to
shutdown of a manual reset control.
The boiler is equipped with a manual reset limit control and a manual reset
low water cutoff. Should the limit control lockout, it can only be reset by
pressing the reset button on the control. The manual reset probe low water
cutoff can be reset after lockout by pressing the reset button on the control or
by interrupting power momentarily.
Steam boilers — Do not substitute another manual reset low water cutoff for
the one specified and supplied with the boiler. Other controls may not operate
as intended and could cause serious operating problems or failures.

Troubleshooting
Refer to Section VIII, Check-out procedure — troubleshooting, of this Supplement and to
component manufacturer’s literature supplied in the boiler manual envelope for further
information on operating conditions.

Part Number 550-110-677/0299

LADDER WIRING DIAGRAM

Wiring — water boilers

EQUIPMENT

120 V.A.C.
SERVICE
SWITCH

GROUND
(NOTE 7)
CIRCULATOR

1K2

Figure 5
C

R
TRANSFORMER

Water boiler wiring —
ladder and schematic diagrams

RELAY COIL
1K

THERMOSTAT
G

MANUAL
RESET
HIGH LIMIT

1K1

MANUAL
RESET
PROBE LWCO

HIGH
LIMIT

CABLE
TO
DAMPER

FUSE
3

ELECTRICAL SHOCK HAZARD, CAN CAUSE SEVERE
INJURY OR DEATH. DISCONNECT POWER
BEFORE INSTALLING AND/OR SERVICING.
NOTES:

1. ALL WIRING MUST BE INSTALLED IN ACCORDANCE WITH:
A. U.S.A. - NATIONAL ELECTRICAL CODE AND ANY OTHER NATIONAL, STATE OR LOCAL
CODE REQUIREMENTS.
B. CANADA - C.S.A. C22.1 CANADIAN ELECTRICAL CODE PART 1 AND ANY OTHER
NATIONAL, PROVINCIAL OR LOCAL CODE REQUIREMENTS.

SEE NOTE 10
2K4
A2
N/A

2K3
2K2
1

2. ALL CONTACTS SHOWN WITHOUT POWER APPLIED-OFF SHELF CONDITION.
3. IF ORIGINALWIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED,
o
TYPE 105 C OR IT’S EQUIVALENT MUST BE USED.

2K1

4. REFER TO CONTROL COMPONENT INSTRUCTIONS PACKED WITH BOILER FOR APPLICATION
INFORMATION.

Part Number 550-110-677/0299

5. THERMOSTAT - FOR SINGLE ZONE SYSTEMS, THERMOSTAT ANTICIPATOR SETTING IS 0.40 AMPS.
FOR MULTIPLE ZONE SYSTEMS USING ZONE VALVES OR CIRCULATORS, REFER
TO COMPONENT MANUFACTURER’S INSTRUCTIONS FOR APPLICATION WIRING AND
THERMOSTAT ANTICIPATOR SETTING.
EMCS - FOR EMCS CONNECTION IN PLACE OF THERMOSTAT, REFER TO EMCS
INSTALLATION/OPERATING MANUAL.

PILOT
SOLENOID
VALVE

LOW VOLTAGE FIELD
HIGH VOLTAGE FIELD
LOW VOLTAGE FACTORY

HIGH VOLTAGE FACTORY

MV/PV

IGNITION CABLE

D+
ALARM

6. L.W.C.O., HIGH LIMITS, WIRED IN SERIES.

D
ALARM

IGNITION CONTROL MODULE TERMINAL.

DENOTES FIELD INSTALLED CHASSIS GROUND.

IGNITION CONTROL PANEL TERMINAL

8. PILOT LEADWIRES ARE NOT FIELD REPLACEABLE. REPLACE
PILOT ASSEMBLY IF NECESSARY.

24V
24V (G)

SENSE

TRANSFORMER TERMINAL.

9. CIRCULATOR NOT USED WITH GRAVITY HOT WATER.
10. ALARM CONTACT RATINGS: 15 AMP @ 250 VAC.

ROBERTSHAW
GAS VALVE

550-225-026/0199

IGNITION CONTROL PANEL LAMP

SPARK

SENSOR
IGNITOR

Part Number 550-110-677/0299

SCHEMATIC WIRING DIAGRAM

R
W
MOMENTARY
SWITCH
R
R

D+

BK
PILOT
SOLENOID
VALVE

D
TH

ROBERTSHAW
GAS VALVE

IMPULSE
RELAY

W
R

UNIVERSAL SPARK
IGNITION CONTROL

R
MV

(NOTE 6)

MV/PV
EQUIPMENT

HIGH
LIMIT

GROUND
(NOTE 7)

MANUAL
MANUAL
RESET
RESET
HIGH LIMIT PROBE LWCO
BK
BK
BK

R
R

ALARM
Y

BK
BK

THERMOSTAT
OR EMCS
(NOTE 5)
BK

ALARM

Y
R

24V

G
G

SERVICE
SWITCH
(BY OTHERS)

Y
G

C
BK

G
R
TRANSFORMER
120/24 V.A.C.

SENSE

TERMINAL
BLOCK

SPARK

PRE-WIRED PANEL

CIRCULATOR
(NOTE 9)

JUNCTION BOX
WIRE NUTS (3)

Y
DAMPER
CONNECTOR

PLUG-IN
DPST
RELAY

Y
W

24V (GND)

NOTE 10
PILOT
(NOTE 8)

CABLE
TO
DAMPER

EGH-105 to EGH-125

Control Supplement

CSD-1 control system — Natural gas

Wiring — water boilers
10
7

Figure 6
Control assembly — water boiler
(CSD-1 is not availabe for water
boilers with tankless heaters.)

MV V
/P
MV
PV
M
AR
AL M
AR
AL
V
4
2
)
ND
V (G
24 E
NS
SE
RK
A
SP

19
3
18

8
21

24
6

15
12

Part Number 550-110-677/0299

11
22
17

13
16
13a

Install strain relief bushings
wherever electrical wiring
passes through jacket.

677-02

Vent connections — Connect
with ¼" tubing and run vent
line outside building per code
requirements.

Part Number 550-110-677/0299

CSD-1 control panel

14 Pilot shutoff valve

Ignition control

15 Leak test valves with plugs

Impulse relay and lighted push-button alarm
silencing switch

16 Gas supply connection
17 Burner manifold
5

Transformer/relay

18 Limit control, auto reset

Junction box

19 Limit control, manual reset

Damper (optional)

20 Pressure/temperature gauge

Damper connector

21 Wire harness

Dummy plug

22 Pilot spark & sense wires

10 Damper harness

23 Pilot gas tubing

11 Main gas valve

24 Circulator, by others

12 Manual gas valve
13 Pilot gas valve

Probe LWCO, Manual reset (Mount in sup25 ply or return piping above top of boiler
between boiler and any isolation valve(s).)

13a Pilot gas pressure regulator

EGH-105 to EGH-125

Control Supplement

CSD-1 control system — Natural gas

LADDER WIRING DIAGRAM

Wiring — steam

EQUIPMENT

120 V.A.C.

GROUND
(NOTE 7)

SERVICE
SWITCH

gravity return

R
TRANSFORMER

Figure 7

RELAY COIL
1K

THERMOSTAT
G

Water boiler wiring —
ladder and schematic diagrams

OPERATING CONTROL

1K1

PRESSURETROL

MANUAL RESET
PRESSURETROL FLOAT LWCO

MANUAL RESET
PROBE LWCO

CABLE
TO
DAMPER

FUSE
3

ELECTRICAL SHOCK HAZARD, CAN CAUSE SEVERE
INJURY OR DEATH. DISCONNECT POWER
BEFORE INSTALLING AND/OR SERVICING.

SEE NOTE 10
2K4
A2
N/A

NOTES:

2K3

2K2
1

2K1

2. ALL CONTACTS SHOWN WITHOUT POWER APPLIED-OFF SHELF CONDITION.

PILOT
SOLENOID
VALVE

3. IF ORIGINAL WIRE AS SUPPLIED WITH THE APLIANCE MUST BE REPLACED,
o
TYPE 105 C OR IT’S EQUIVALENT MUST BE USED.

Part Number 550-110-677/0299

4. REFER TO CONTROL COMPONENT INSTRUCTIONS PACKED WITH BOILER FOR APPLICATION
INFORMATION.

LOW VOLTAGE FIELD

MV/PV

HIGH VOLTAGE FIELD
LOW VOLTAGE FACTORY
HIGH VOLTAGE FACTORY

IGNITION CABLE

6. L.W.C.O., PRESSURE CONTROLS, WIRED IN SERIES.

D
ALARM
ALARM
24V

IGNITION CONTROL MODULE TERMINAL.

DENOTES FIELD INSTALLED CHASSIS GROUND.

24V (G)
IGNITION CONTROL PANEL TERMINAL.

8. PILOT LEADWIRES ARE NOT FIELD REPLACEABLE. REPLACE
PILOT ASSEMBLY IF NECESSARY.

TRANSFORMER TERMINAL.

ROBERTSHAW
GAS VALVE
2

SENSE
SPARK

SENSOR

9. OPERATING CONTROL REQUIRED WITH TANKLESS HEATER.
10. ALARM CONTACT RATINGS: 15 AMP @ 250 VAC.

550-225-027/0199

IGNITION CONTROL PANEL LAMP

IGNITOR

Part Number 550-110-677/0299

SCHEMATIC WIRING DIAGRAM

R
W

MOMENTARY
SWITCH
R
R
D

BK
PILOT
SOLENOID
VALVE

D
R

(NOTE 6)

PRESSURETROL
BK

IMPULSE
RELAY

MANUAL RESET
PROBE LWCO

MANUAL RESET
PRESSURETROL

FLOAT LWCO
BK
BK

ROBERTSHAW
GAS VALVE

UNIVERSAL SPARK
IGNITION CONTROL

R
BK

MV/PV
OPERATING
CONTROL
(NOTE 9)
Y
Y

EQUIPMENT
GROUND
(NOTE 7)

R
ALARM
Y

THERMOSTAT
OR EMCS
(NOTE 5)
BK

BK
BK

ALARM

24V

G
R

G
SERVICE
SWITCH
(BY OTHERS)

24V (GND)

W
G

SENSE

TERMINAL
BLOCK

SPARK

G
G

C
BK

TRANSFORMER
120/24 V.A.C.

PRE-WIRED PANEL

W
PLUG-IN
DPST
RELAY

JUNCTION BOX

DAMPER
CONNECTOR

WIRE NUTS (2)

NOTE 10
PILOT
(NOTE 8)

CABLE
TO
DAMPER

EGH-105 to EGH-125

Control Supplement

CSD-1 control system — Natural gas

Wiring — steam
gravity return
10
7

Figure 8
Control assembly — steam, gravity return

19
MV V
/P
MV
PV
M
AR
AL M
AR
AL
V
24

)
ND
V (G
24 E
NS
SE
K
AR
SP

22
25

When using a tankless heater,
knockout the opening in the
inner panel. Locate the controls
to allow room for the tankless
heater piping. The tankless
heater temperature control (not
shown) installs in the heater
tapping.

23
24
6

15
12

Part Number 550-110-677/0299

11
26
17

13
16

27
13a

Install strain relief bushings
wherever electrical wiring
passes through jacket.

677-01

Vent connections — Connect
with ¼" tubing and run vent
line outside building per code
requirements.

Part Number 550-110-677/0299

CSD-1 control panel

14 Pilot shutoff valve

Ignition control

15 Leak test valves with plugs

Impulse relay and lighted push-button alarm
silencing switch

16 Gas supply connection

Terminal strip

17 Burner manifold

Transformer/relay

18 Limit control, automatic reset

Junction box

19 Limit control, manual reset

Damper (optional)

20 Pressure gauge

Damper connector

21 Siphons

Dummy plug

22 Gauge glass & valves

10 Damper harness

23 Probe LWCO, manual reset

11 Main gas valve

24 Float LWCO control, automatic reset

12 Manual gas valve

25 Wire harness

13 Pilot gas valve

26 Pilot spark & sense wires

13a Pilot gas pressure regulator

27 Pilot gas tubing

EGH-105 to EGH-125

Control Supplement

CSD-1 control system — Natural gas

LADDER WIRING DIAGRAM

Wiring — steam

EQUIPMENT

120 V.A.C.

GROUND
(NOTE 7)

SERVICE
SWITCH

pumped return

Figure 9

TRANSFORMER
RELAY COIL
1K

THERMOSTAT

Water boiler wiring —
ladder and schematic diagrams

G
OPERATING CONTROL
FLOAT LWCO
& PUMP
MANUAL RESET
PRESSURETROL PRESSURETROL CONTROL

1K1

N H CWB
MANUAL RESET
PROBE LWCO
(NOTE 11)

CABLE
TO
DAMPER

FUSE
3

ELECTRICAL SHOCK HAZARD, CAN CAUSE SEVERE
INJURY OR DEATH. DISCONNECT POWER
BEFORE INSTALLING AND/OR SERVICING.

SEE NOTE 10
2K4
A2

NOTES:

N/A

2K3
2K2
1

2. ALL CONTACTS SHOWN WITHOUT POWER APPLIED-OFF SHELF CONDITION.
2K1

3. IF ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED,
o
TYPE 150 C OR IT’S EQUIVALENT MUST BE USED.

PILOT
SOLENOID
VALVE

4. REFER TO CONTROL COMPONENT INSTRUCTIONS PACKED WITH BOILER FOR APPLICATION
INFORMATION.

Part Number 550-110-677/0299

LOW VOLTAGE FIELD

6. L.W.C.O., PRESSURE CONTROLS, WIRED IN SERIES.

IGNITION CABLE

MV/PV

HIGH VOLTAGE FIELD
LOW VOLTAGE FACTORY
HIGH VOLTAGE FACTORY

D
ALARM
D
ALARM

DENOTES FIELD INSTALLED CHASSIS GROUND.

24V

IGNITION CONTROL MODULE TERMINAL.
24V (G)

8. PILOT LEADWIRES ARE NOT FIELD REPLACEABLE. REPLACE
PILOT ASSEMBLY IF NECESSARY.

IGNITION CONTROL PANEL TERMINAL.

9. OPERATING CONTROL REQUIRED WITH TANKLESS HEATER.

TRANSFORMER TERMINAL.

ROBERTSHAW
GAS VALVE
2

SENSE
SPARK

SENSOR

10. ALARM CONTACT RATINGS: 15 AMP @ 250 VAC.

11. REMOVE JUMPER BAR BETWEEN TERMINAL "H" AND TERMINAL "C".

550-225-028/0399

IGNITION CONTROL PANEL LAMP

IGNITOR

Part Number 550-110-677/0299

SCHEMATIC WIRING DIAGRAM

R
MOMENTARY
SWITCH
R
R

W
D
BK

D
TH

(NOTE 6)

FLOAT LWCO
& PUMP
CONTROL
BK

PRESSURETROL
BK

IMPULSE
RELAY

MANUAL RESET
PROBE LWCO

MANUAL RESET
PRESSURETROL

PILOT
SOLENOID
VALVE

W
R

ROBERTSHAW
GAS VALVE
UNIVERSAL SPARK
IGNITION CONTROL

R
BK

MV/PV
EQUIPMENT

OPERATING
CONTROL
(NOTE 9)
Y
Y

GROUND
(NOTE 7)

BK
BK

R
R

ALARM
Y

THERMOSTAT
OR EMCS
(NOTE 5)
BK

ALARM

24V

Y
G

R
G

SERVICE
SWITCH
(BY OTHERS)

Y
G

C
BK

SENSE

TERMINAL
BLOCK

SPARK

24V (GND)

TRANSFORMER
120/24 V.A.C.

PRE-WIRED PANEL

W
PLUG-IN
DPST
RELAY

JUNCTION BOX

Y
DAMPER
CONNECTOR

WIRE NUTS (2)

NOTE 10
PILOT
(NOTE 8)

CABLE
TO
DAMPER

EGH-105 to EGH-125

Control Supplement

CSD-1 control system — Natural gas

Wiring — steam
pumped return
10
7

Figure 10
Control assembly — steam, pumped return

19
MV V
/P
MV
PV
M
AR
AL M
AR
AL
V
24

)

22
25

V (G
24 E
NS
SE
RK
A
SP

15
12

Part Number 550-110-677/0299

11
26
17

13
16

27
13a

Install strain relief bushings
wherever electrical wiring
passes through jacket.

677-01-p

Vent connections — Connect
with ¼" tubing and run vent
line outside building per code
requirements.

Part Number 550-110-677/0299

CSD-1 control panel

14 Pilot shutoff valve

Ignition control

15 Leak test valves with plugs

Impulse relay and lighted push-button alarm
silencing switch

16 Gas supply connection

Terminal strip

17 Burner manifold

Transformer/relay

18 Limit control, auto reset

Junction box

19 Limit control, manual reset

Damper (optional)

20 Pressure gauge

Damper connector

21 Siphons

Dummy plug

22 Gauge glass & valves

10 Damper harness

23 Probe LWCO, manual reset

11 Main gas valve

24 Float LWCO/pump control, auto reset

12 Manual gas valve

25 Wire harness

13 Pilot gas valve

26 Pilot spark & sense wires

13a Pilot gas pressure regulator

27 Pilot gas tubing

EGH-105 to EGH-125

Control Supplement

CSD-1 control system — Natural gas

EGH-105 to EGH-125

VII
Before proceeding:

Control Supplement

Final adjustments
1. Follow EGH Manual instructions for Final Adjustments, Section VII,
including filling the boiler and skimming steam boilers.
Skimming the boiler as described in Section VII of the
EGH Manual requires firing the boiler. Always follow
boiler Operating instructions, Figure 11, when starting
the boiler. Failure to do so could result in severe personal
injury, death or substantial property damage.
2. Inspect base insulation as instructed in Section VII of the EGH Manual.

To place boiler in operation:

1. Follow Operating instructions, Figure 11, to start boiler.
2. If boiler starts correctly, proceed with Check-out procedure, Section
VIII of this Supplement.
3. If boiler fails to start, check:
❏ Loose connection or blown fuse?
❏ Limit setting below boiler water temperature or steam pressure?
❏ Thermostat below room temperature?
❏ Manual reset device needs to be reset?
❏ Gas not turned on at meter and boiler?
❏ Incoming natural gas pressure less than 5" W. C.?
4. If above fails to eliminate the trouble, refer to Check-out procedure
— troubleshooting in this Supplement, Section VIII.

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

VII

Final adjustments — operating instructions
Figure 11 Operating instructions

Part Number 550-110-677/0299

EGH-105 to EGH-125

VIII

Control Supplement

Check-out procedure — operation
Always follow boiler Operating instructions, Figure 11, when starting the
boiler. Failure to do so could result in severe personal injury, death or substantial
property damage.
1. Increase setting of room thermostat (or operating control) to call for heat.
2. Vent damper (if provided) will slowly open. When damper is fully open, the ignition
control will open pilot gas valve and start spark.
Vent damper must be in open position when appliance main burners are
operating. If damper is not in open position, flue products will spill into the
building, causing severe personal injury or death.
3. If pilot lights and proves within 15 seconds, the ignition control turns off the spark and
opens the main gas valve (dual valves in single body). Main burners ignite.
If pilot does not light and prove within 15 seconds, the ignition control shuts
off pilot gas and spark and waits 5 minutes. It then will retry. If the second
ignition attempt fails, the ignition control will lockout and close the alarm
contact of the impulse relay.
4. During main burner operation:
•

The ignition control monitors pilot flame current. If signal is lost, main valve is closed,
spark is activated, and the operating sequence returns to step 3.

•

If power is interrupted, the control system shuts off pilot and main gas valves and
restarts at Step 1 when power is restored.

5. Stop the call for heat (lower thermostat or operating control).
•

Pilot and main gas valves will close.

•

Damper (if provided) will close.

6. Boiler is now in the off cycle.
7. Repeat steps 1 through 6 several times to verify operation.
8. Return thermostat or operating control to normal setting.

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

VIII

Check-out procedure — leak test
For your safety, turn off electrical
power supply before making any
electrical connections to avoid
possible shock hazard.

1. Turn off power to the boiler and remove the (RED)
wire from terminal TH of the main gas valve
(Figure 12, item 1). Tape off terminal end of
removed wire and restore power to the boiler.
2. Close manual gas valve (Figure 12, item 2).
3. Check that both leak test valves (Figure 12, items 3
and 4) are closed. Then remove plugs and insert
1/8" NPT hose barb fittings as shown in Figure 12.

9. Open second leak test valve (Figure 12, item 4) and
check for pressure. See NOTICE below.
10. Close second leak test valve and remove
manometer.
11. Remove call for heat to boiler. Turn off power to
the boiler.
12. Remove hose barbs from leak test valves and
replace plugs.
13. Replace (RED) wire to terminal TH of gas valve.
14. Open manual gas valve (Figure 12, item 2) and
restore power to boiler.

4. Attach a U-tube manometer to first leak test valve
(Figure 12, item 3).

When checking for pressure at the
leak test valves, it is normal to find a
small pressure reading. If the
pressure continues to rise after
opening the leak test valve, the main
valve seat is leaking and should be
replaced.

5. Open first leak test valve (Figure 12, item 3) and
check for pressure. See NOTICE at right.
6. Close first leak test valve (Figure 12, item 3) and
remove manometer.
7. Attach manometer to second leak test valve (Figure
12, item 4 ).
8. Apply call for heat to boiler and check that
electronic pilot proves.
l
ne
pa
l
o
ntr
co
To

4
3
Figure 12
Leak test procedure

2
1
677-11

Part Number 550-110-677/0299

EGH-105 to EGH-125

VIII

Control Supplement

Check-out procedure — troubleshooting

Verify proper operation after servicing
Never jumper (bypass) any device except for momentary
testing as outlined in Troubleshooting Charts. Substantial
property damage and/or severe personal injury could
occur.
Burner access panel must be in position during boiler
operation to prevent momentary flame rollout on
ignition of main flame. Severe personal injury or
substantial property damage will result.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.

2. If Step 1 does not open damper, manually rotate
damper blade to open position using wrench or
pliers on flat shaft between damper and actuator
(Figure 13). Boiler will fire.
Verify that damper service switch is in "HOLD
DAMPER OPEN" position.
3. Do not leave damper permanently in this position.
Replace actuator immediately. If damper is left in
open position, boiler will not operate at published
efficiencies.
See damper manufacturer's instructions packed
with damper for additional information.

Johnson damper:
If troubleshooting chart recommends replacing
actuator and actuator is not immediately available,
damper blade can be fixed in an open position to allow
boiler operation. Follow these instructions only in case
of no heat or damper actuator malfunction.
See Figure 13.
1. Turn off power to boiler.

Before troubleshooting:
a. Have a voltmeter that can check 120VAC, 24VAC, a microammeter
with minimum scale range of 0–25, and continuity tester.
b. Check for 120VAC (minimum 102 – maximum 132) to boiler.
c. Check for 24VAC at secondary side of transformer.
d. Make sure thermostat is calling for heat and contacts (including
appropriate zone controls) are closed. Check for 24VAC between
thermostat wire nuts and ground.

In event of actuator failure:
3.
4.

Effikal damper:
If troubleshooting chart recommends replacing actuator and actuator is
not immediately available, damper blade can be fixed in an open position
to allow boiler operation. Manually turning blade can cause actuator
damage. Follow these instructions only in case of no heat or damper
actuator malfunction. See Figure 13.
1. Move damper service switch to "HOLD DAMPER OPEN" position.
Apply call for heat to boiler. Damper blade should then rotate to open
position and boiler will fire.

Open

Failure to turn off power to boiler
can result in severe personal injury,
death or substantial property
damage.
Refer to damper manufacturer’s instructions for
procedure to fix damper in open position.
Turn on power to boiler.
Using wrench or pliers on flat shaft section,
manually rotate damper blade until green light
turns on. Boiler will fire.
Do not leave damper permanently in this position.
Replace actuator immediately. If damper is left in
open position, boiler will not operate at published
efficiencies.

See damper manufacturer's instructions packed
with damper for additional information.

677-14

Closed

Damper blade
indicator

Figure 13
Temporary manual opening of vent damper —
refer also to vent damper manufacturer’s
instructions.

Wrench or pliers

Effikal damper

Johnson Controls damper

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

VIII

Check-out procedure — troubleshooting

TS-1: No Spark — System (boiler without vent damper) does not work

VISUALLY CHECK — Is ground wire connected from
GND (Burner) to ignition control mounting screw, and
ground wire connected from transformer terminal C to case
ground?
Correct by making connections.

Check for open thermostat, circulator relay, operating
control, limit control or LWCO. Check the CSD-1
control panel, impulse relay and push-button switch.
If limit controls or water level controls
lockout on manual reset, determine
cause and correct condition. Failure to
do so could result in severe personal
injury, death or substantial property
damage.

Replace ignition control. Retest.

Yes

Is 24VAC present across terminals 24V and 24V(GND)?
No

Yes

Open thermostat (or operating control) contacts for 15
seconds. Close thermostat contacts. Is 24VAC across
terminals PV & MV/PV?
No

Yes

Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off
power before proceeding could cause
severe personal injury or death.

Securely connect spark wire. Then turn ON supply
voltage. Retest.

Check spark wire. Is it securely connected to spark
transformer?
No

Yes

Is condition of spark wire good (not cut, brittle, burned or
cracked)?
Replace pilot assembly. Retest.

Is spark gap 0.125" and isolated in pilot gas stream?
No
Yes

Replace pilot assembly,
turn ON supply voltage.
Operate system several
complete heat cycles.

Part Number 550-110-677/0299

Replace ignition
control. Retest.

Yes

Is spark electrode ceramic cracked?
No

Yes

Replace pilot assembly, turn ON supply voltage, operate
system several complete heat cycles.

EGH-105 to EGH-125

VIII

Control Supplement

Check-out procedure — troubleshooting

TS-2: No Spark — System (boiler with vent damper) does not work
Secure connections.

Is damper harness securely plugged in at both ends?
No

Check for loose wire connections or bad relay on
transformer.

Yes

Is 24VAC present across transformer terminals C & Y?
No

Check for open thermostat, circulator relay, operating
control, limit control or LWCO. Check the CSD-1 control
panel, impulse relay and push-button switch.

Yes

Is 24VAC present across terminal C and yellow wire on
damper connector?

If limit controls or water level controls
lockout on manual reset, determine cause
and correct condition. Failure to do so could
result in severe personal injury, death or
substantial property damage.

Yes
Is damper rotated open?
Yes

No
Check for out of round stack section. Does motor rotate
open?
No

Is 24VAC present across terminals PV and MV/PV?

Yes

Replace actuator.
Retest.

Yes
Is spark present now?

No
Open thermostat contacts for 30 seconds. Damper will
rotate to closed position. Close thermostat contacts.
Damper will rotate to open position. Is 24VAC present
across terminals PV and MV/PV?

Check continuity of each wire in wiring harness to
damper. Does continuity exist for each wire?
Yes

No
Replace damper
wiring harness.
Retest.
Replace ignition
control. Retest.

Remove damper harness from
boiler wiring harness.
TEMPORARILY install jumper
between terminal 2 and
terminal 5 on damper plug in
boiler wiring harness. See
figure below. Does boiler fire?
No

Retest.
Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off
power before proceeding could cause
severe personal injury or death.

Yes

Replace damper
actuator. Retest.

Check spark wire. Is it securely
connected to ignition control?

Securely connect
and turn ON supply
voltage. Retest.

Is spark gap 0.125" and
located in pilot gas stream?
No

Yes

Is condition of spark wire good
(not brittle, burned or cracked)?

Replace pilot
assembly. Retest.

Yes

Replace pilot
assembly.
Temporary
jumper

Yes

Yes
Is spark electrode
ceramic cracked?
No

Replace ignition
control. Retest.

Yes
Replace
pilot
assembly.

Turn ON supply voltage and operate
system several complete cycles.

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

VIII

Check-out procedure — troubleshooting

TS-3: Pilot lights — Main valve will not come on (boiler with or without damper)
Does spark stay on for more than a few seconds after pilot is established?
No

Yes
Turn OFF supply voltage.

Is 24VAC between terminals MV and MV/PV on ignition
control?
No

Yes

Replace ignition control.
Retest.

Make sure sense wire is not wrapped around any pipe or
accessories.

Is inlet gas pressure at least 5.0" W.C. and not over 14"
W.C.?
No

Electrical shock hazard. Failure to turn off
power before proceeding could cause
severe personal injury or death.

Yes

Is sense wire securely attached to sense terminal and pilot
assembly?
No

Yes

Correct and retest.

Contact gas supplier to
correct.

Is sensing probe ceramic cracked?
No

Is main valve wiring secure at terminals?
No

Yes

Correct wiring. Retest.

Replace valve. Retest.

Replace pilot assembly.
Retest.

Check for continuity of sense wire and condition of
insulation.
NOT OK

Is sense wire or sensing probe shorted out to metal
surface?
No

Yes

Correct and retest.

Replace pilot assembly.
Retest.

Replace ignition control.
Retest.

Yes

Does system have proper flame signal?
Set up microammeter to measure output current in flame sensor circuit as follows.
a. Detach sense lead from ignition control. Attach negative lead from microammeter to sense
terminal on ignition control.
b. Attach positive lead to sense wire from pilot assembly.
c. Disconnect main valve lead from terminal MV on ignition control.
d. Energize the system. Spark should ignite the pilot. As soon as pilot is burning,
microammeter should read at least 0.5 microamp for U.T. # 1003-615.
e. Is flame current signal less than the minimum specified in d above?
No

Yes

Check for proper gas pressure, clean pilot assembly, tight mechanical and electrical
connections. Also check for proper system grounding per following page.

Part Number 550-110-677/0299

EGH-105 to EGH-125

VIII

Control Supplement

Check-out procedure — troubleshooting

TS-3: Pilot lights — Main valve will not come on - continued from previous page
Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off
power before proceeding could cause
severe personal injury or death.
To check ignition system grounding (instruction for continuation of TS-3)
Pilot assembly and ignition control must share common
ground with main burner. Nuisance shutdowns are often
caused by poor or erratic ground.
❏ Check for good metal-to-metal contact between pilot
burner bracket and main burner and between main
burner and burner rest.

❏ Check ground lead from GND (Burner) terminal on
ignition control to ignition control mounting screw and
from C on transformer to transformer case ground.
Make sure connections are clean and tight. If wire is
damaged or deteriorated, replace with No. 18 gauge
moisture-resistant, thermoplastic insulated wire with
105 °C minimum rating.

TS-4: Spark is present - pilot will not light (boiler with or without damper)

Are pilot valve wiring connections CORRECT and securely fastened?
No

Connect securely to terminal PV on ignition control and
terminal TR on main gas valve.

Yes

Is inlet gas pressure at least 5.0" W.C. and not over 14"
W.C.?
No

Yes

Is pilot shutoff valve open?
No

Yes

Open pilot shutoff valve.

Contact gas supplier to
correct gas pressure.

Is gas present at pilot burner assembly?
Remove MV wire from ignition control. Use a
match taped to a long screwdriver or pilot
lighter rod and manually light pilot.
No

Make sure pilot shutoff valve is open, 24VAC is present to
pilot valve and pilot line is not kinked or obstructed. Check
for clean pilot orifice. If OK, replace pilot gas valve.

Replace pilot assembly.

Yes

Is spark gap 0.125" and located in pilot gas stream?
No

Yes

Block any draft around
boiler. Check for clean
pilot orifice.

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

Service and maintenance
Complete Installation and Service Certificate in EGH Manual, Section IX.
Follow EGH Manual, Section IX, for service and maintenance of boiler.

Part Number 550-110-677/0299

EGH-105 to EGH-125

Control Supplement

Replacement parts — water boilers
Figure 14 Water boiler assembly

MV V
/P
MV
PV
M
AR
AL M
AR
AL
V
24

13
14
15

21
20

)
ND
V (G
24 E
NS
SE
K
AR
SP

12
23

16
16
7

24
6
1

5
8
10

677-12

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

Table 5 Water boiler replacement parts
Before replacing any parts on the boiler — Turn off power to boiler and shut off gas supply.
Failure to comply could result in severe personal injury, death or substantial property damage.
Item Part description
1
2
3

Boiler models

Vendor

Vendor part number

Weil-McLain
part number

Main burner
Main burner with pilot bracket
Pilot burner bracket (not shown)

EGH-105 – 125 Weil-McLain
— See EGH Manual —
EGH-105 – 125 Weil-McLain
— See EGH Manual —
EGH-105 – 125 Weil-McLain
— See EGH Manual —
Beckett Gas
E48A-1
4 Pilot burner (not shown)
EGH-105 – 125
511-330-166
Johnson Controls
Q90GE-1
5 Main gas valve
EGH-105 – 125 Robertshaw
7000DERHC-S7C 511-044-287
6 Manual gas valve, 1" NPT
EGH-105 – 125 Watts
FBV3-06
511-246-290
7 Leak test valve
EGH-105 – 125 Key Gas
511-246-339
Honeywell
V8046C-1014
8 Pilot gas valve
EGH-105 – 125
511-044-039
Johnson Controls
H91ABG
8a Pilot gas pressure regulator
EGH-105 – 125 Maxitrol
RV20VL
510-933-195
9 Pilot shutoff valve
EGH-105 – 125 Conbraco
53-300-01
511-246-345
10 Pilot tubing, alum. 1/8" O.D. x 34" long
EGH-105 – 125 Available at local supply house
11 Ignition control
EGH-105 – 125 United Technologies
1003-615
511-330-086
12 Impulse relay
EGH-105 – 125 Potter-Brumfield
S89R-11ABD1-24 510-350-226
Honeywell
AML21CBA2AA
13 Push-button switch
EGH-105 – 125
511-624-580
Eaton Controls
221K11810
Honeywell
AML51-C10R
14 Lens cover
EGH-105 – 125
511-624-581
Eaton Controls
220PM02A
15 Light bulb
EGH-105 – 125 TI-¾ (available at local supply house)
16 Wiring harness, water boilers
EGH-105 – 125 Weil-McLain
591-391-886
Effikal
RVGP-KS-10BF
EGH-105
381-800-446
Johnson Controls
Q35GP-2 (note 1)
Vent damper assembly — optional
17
(not for use in Canada)
Effikal
RVGP-KS-12BF
EGH-115 – 125
381-800-447
Johnson Controls
Q35GR-2 (note 1)
Effikal only
RVGP
510-512-337
18 Vent damper actuator
EGH-105 – 125
Johnson only
M35BE-1C
510-312-255
19 Vent damper harness
EGH-105 – 125 Weil-McLain
10C321
591-391-795
Honeywell
L4080B-1311
20 Limit control, automatic reset
EGH-105 – 125
510-312-209
White-Rodgers
11B83-16
21 Limit control, manual reset
EGH-105 – 125 Honeywell
L4006E-1000
510-312-041
22 Probe LWCO, manual reset
EGH-105 – 125 McDonnell & Miller
PS852M-24
511-114-530
Ametek
19998
23 Pressure/temperature gauge
EGH-105 – 125
510-218-097
ENFM-USA
4104-2-1/2-1/4CBM
24 Transformer/relay
EGH-105 – 125 Honeywell
R8285D-5001
510-312-169
Note 1 — Johnson damper assembly consists of M35BC actuator and Y15 vent pipe.
Replacement parts must be purchased through a local Weil-McLain distributor. When ordering, specify boiler model and series and
include description and number of replacement part. Results from using modified or other manufactured parts will not be covered
by warranty and may damage boiler or impair operation.
Refer to boiler manual for parts not listed above.

Part Number 550-110-677/0299

EGH-105 to EGH-125

Control Supplement

Replacement parts — steam boilers
Figure 15 Steam boiler assembly

MV V
/P
MV
PV

M
AR
AL M
AR
AL
V
24

13
14
15

)
ND
V (G
24 E
NS
SE
K
AR
SP

16
23a
7

25
6
23b

5
8
10

8a
9

677-13

Part Number 550-110-677/0299

CSD-1 control system — Natural gas

Table 6 Steam boiler replacement parts
Before replacing any parts on the boiler — Turn off power to boiler and shut off gas supply. Failure to comply could
result in severe personal injury, death or substantial property damage.
Item Part description
1
2
3

Boiler models

Vendor

Vendor part number

Weil-McLain
part number

Main burner
Main burner with pilot bracket
Pilot burner bracket (not shown)

EGH-105 – 125 Weil-McLain
— See EGH Manual —
EGH-105 – 125 Weil-McLain
— See EGH Manual —
EGH-105 – 125 Weil-McLain
— See EGH Manual —
Beckett Gas
E48A-1
4
Pilot burner (not shown)
EGH-105 – 125
511-330-166
Johnson Controls
Q90GE-1
5
Main gas valve
EGH-105 – 125 Robertshaw
7000DERHC-S7C 511-044-287
6
Manual gas valve, 1" NPT
EGH-105 – 125 Watts
FBV3-06
511-246-290
7
Leak test valve
EGH-105 – 125 Key Gas
511-246-339
Honeywell
V8046C-1014
8
Pilot gas valve
EGH-105 – 125
511-044-039
Johnson Controls
H91ABG
8a Pilot gas pressure regulator
EGH-105 – 125 Maxitrol
RV20VL
510-933-195
9
Pilot shutoff valve
EGH-105 – 125 Conbraco
53-300-01
511-246-345
10 Pilot tubing, alum. 1/8" O.D. x 34" long
EGH-105 – 125 Available at local supply house
11 Ignition control
EGH-105 – 125 United Technologies
1003-615
511-330-086
12 Impulse relay
EGH-105 – 125 Potter-Brumfield
S89R-11ABD1-24 510-350-226
Honeywell
AML21CBA2AA
13 Push-button switch
EGH-105 – 125
511-624-580
Eaton Controls
221K11810
Honeywell
AML51-C10R
14 Lens cover
EGH-105 – 125
511-624-581
Eaton Controls
220PM02A
15 Light bulb
EGH-105 – 125 TI-¾ (available at local supply house)
Wiring harness, pumped return steam
EGH-105 – 125 Weil-McLain
591-391-888
16
Wiring harness, gravity return steam
EGH-105 – 125 Weil-McLain
591-391-887
Effikal
RVGP-KS-10BF
EGH-105
381-800-446
Johnson Controls
Q35GP-2 (note 1)
Vent damper assembly — optional
17
(not for use in Canada)
Effikal
RVGP-KS-12BF
EGH-115 – 125
381-800-447
Johnson Controls
Q35GR-2 (note 1)
Effikal only
RVGP
510-512-337
18 Vent damper actuator
EGH-105 – 125
Johnson only
M35BE-1C
510-312-255
19 Vent damper harness
EGH-105 – 125 Weil-McLain
10C321
591-391-795
Honeywell
PA-404-A
510-312-135
20 Limit control, automatic reset
EGH-105 – 125
White-Rodgers
P47EA-3
510-311-023
21 Limit control, manual reset
EGH-105 – 125 Honeywell
L404C-1147
510-312-060
22 Probe LWCO, manual reset
EGH-105 – 125 McDonnell & Miller
PS852M-24
511-114-530
23a Float LWCO, automatic reset
EGH-105 – 125 McDonnell & Miller
67W-1
511-114-494
23b Float LWCO/pump control, auto reset
EGH-105 – 125 McDonnell & Miller
42-A
511-114-531
Ametek
P505K
24 Pressure gauge
EGH-105 – 125
510-218-045
Winter
E1437
25 Transformer/relay
EGH-105 – 125 Honeywell
R8285D-5001
510-312-169
Note 1 — Johnson damper assembly consists of M35BC actuator and Y15 vent pipe.
Replacement parts must be purchased through a local Weil-McLain distributor. When ordering, specify boiler model and series and
include description and number of replacement part. Results from using modified or other manufactured parts will not be covered
by warranty and may damage boiler or impair operation.
Refer to boiler manual for parts not listed above.

Part Number 550-110-677/0299

EGH-105 to EGH-125

Control Supplement

Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
36

Part Number 550-110-677/0299

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