LENNOX Package Units(both Units Combined) Manual L0806697

User Manual: LENNOX LENNOX Package Units(both units combined) Manual LENNOX Package Units(both units combined) Owner's Manual, LENNOX Package Units(both units combined) installation guides

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INSTALLATION
INSTRUCTIONS

iwvox-)
®
,t_ 2005

Lennox
Dallas,

Industries

Inc.

Texas,

USA

15GCSX SERIES UNITS
GAS PACKAGED UNITS (2-5 TONS)
Armstrong # 38152A081
505,039M
01/08
Supersedes 08/05

_pu

Technical
blications
Litho

U.S.A.

Unit Dimensions ...............................
Parts Arrangement .............................
Shipping & Packing List .........................
General .......................................
Safety Information ..............................
Location Selection ..............................
Rigging & Setting Unit ..........................
Clearances ....................................
Installing Vent Hood ............................
Existing Common Vent Systems .................
Condensate Drain ..............................
Filters .........................................
Supply & Return Connections ....................
Compressors ..................................
Gas Supply and Piping ..........................
Electrical .....................................
Blower Control Board ..........................
Cooling Start-Up ..............................
Heating Start-up ..............................
Unit Controls .................................
Condenser Fan Clearances .....................
Maintenance ..................................
Repair Parts & Accessories .....................

RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

-&WARNING

c( )us

2
3
3
3
3
4
5
5
6
6
7
7
7
8
8
10
12
14
15
16
18
20
20

GAS-FIRED

o us
LISTED

Do not store or use gasoline or other
flammable
vapors and liquids in the
vicinity
of this or any other appliance.
Installation
and service
must be
performed
by a qualified installer,
service agency or the gas supplier.

WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Leave the building immediately.
• 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.

505,039M

01/08

IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIlllllll

Page 1

IIIlllllllllllllllllllllllllll

(

2-1/2 (64)
DOWN-FLOW

(70)
2-314
DOWN-FLOW
RETURN AIR
OPENING

-r

15GCSXAV-24

125

15.5

28.5

15GCSXAV-30

125

15.5

28.5

15GCSXAV-36

101

126

105

29.5

15GCSXAV-42

108

136

176

140

15GCSXAV-48

112

137

177

144

33.5

15GCSXAV-60

117

143

184

151

33.5

Model
Number

in.

E
i
u

Center Of
Gravity
FF

Corner Weights

TOP VIEW
,iI

HORIZONTAL
SUPPLY AIR

OPENING

2-3/4
(70)

K _I-

2-314

(70)
J -_

BACK VIEW

.91- 4-1/4 (108)
_'X'_

7HORIZONTAL
RETURN
AIR
OPENINGS
(2)

D : E---_ H

FRONT VIEW

GAS PIPING INLET

__I
3-1/4 (83)

FLUE
OUTLET

ELECTRICAL INLET

"I-

_L---P
2-1/2 (64) _i
_
END VIEW

CONDENSATE

END

A
Model No.

DRAIN

VIEW

in.

15GCSXAV-24
15GCSXAV-30
15GCSXAV-36

34-1/4

870

65-3/8

1661

36-1/2

927

11-1/4

286

17-1/4

438

508

15GCSXAV-42
15GCSXAV-48
15GCSXAV-60

38-1/4

972

1905

1168

11-1/4

286

19-1/4

489

559

F
Model No.

in.

15GCSXAV-24
15GCSXAV-30
15GCSXAV-36

508

8-1/2

216

20-1/4

514

4-1/2

114

483

15GCSXAV-42
15GCSXAV-48
15GCSXAV-60

559

9-1/4

241

3-1/4

22-1/4

572

102

16-1/4

413

Page 2

PureAir_
Air Purification System
(Optional)
\\

Gas Valve

Ignition Control
Board

Condenser
Coil

Evaporator
Coil
Control Box

Compressor
\

Variable
Speed
Blower Motor

Burner Box

Gas

Manifold

Pressure
Switch

Combustion
Air Inducer

1 - Assembled gas package unit
1 - Vent hood assembly with screen and screws
As soon as the unit is received, it should be inspected for
possible damage during transit. If you find any damage, immediately contact the last carrier.

These installation instructions are intended as a general
guide only, for use by an experienced, qualified contractor.
The 15GCSX units are single-package air conditioners
with two-stage gas heat designed for outdoor installation
on a rooftop or a slab.
The unit must be sized based on heat loss and heat gain
calculations made according to the methods of the Air
Conditioning Contractors of America (ACCA).
The units are shipped assembled. All piping, refrigerant
charge, and electrical wiring are factory-installed and
tested. The units require electric power, gas piping,
condensate drain and duct connections at the point of
installation. In addition, the heating vent hood must be
installed before the unit is placed into operation

Page 3

Ak WARNING

,CAUTION

&IMPORTANT

Lennox does not recommend the use of 15GCSX units as a

,&, WARNING

construction heater during any phase of construction, Very
low return air temperatures, harmful vapors and operation
of the unit with clogged or misplaced filters will damage the
unit,
15GCSX units may be used for heating of buildings or
structures under construction, if the following conditions
are met:
• The vent hood must be installed per these installation instructions.
• A room thermostat must control the furnace, The use of
fixed jumpers that will provide continuous heating is not
allowed.
• The return air duct must be provided and sealed to the
furnace.
• Return air temperature range between 60°F (16°C) and
80°F (27°C) must be maintained.

These units must be installed

in accordance

• Air filters must be installed in the system and must be
maintained during construction.

with all

applicable national and local safety codes,

• Air filters must be replaced upon construction completion.

These instructions are intended as a general guide and do
not supersede local codes in any way, Consult authorities
having jurisdiction before installation.

• The input rate and temperature rise must be set per the
unit rating plate.

If components are to be added to a unit to meet local codes,
they are to be installed at the dealer's and/or customer's

• One hundred percent (100%) outdoor air must be provided for combustion air requirements during construction. Installation of this unit in its intended outdoor location will accomplish this.

expense.
These units are design listed by UL in both the United
States and Canada as follows:

• The heat exchanger, components, duct system, air filters and evaporator coil must be thoroughly cleaned following final construction clean-up.

• - For use as a forced air furnace with cooling,
• - For outdoor installation only,

• The unit operating conditions (including ignition, input
rate, temperature rise and venting) must be verified according to these installation instructions.

• - For installation on combustible material,
• - For use with natural gas or L.P,/propane gas only. Use
of L.P./propane gas requires installation of an L,P,
conversion kit, which must be ordered separately.
These units are not suitable for use with conventional

NOTE - The Commonwealth
of Massachusetts
lates these additional requirements:

stipu-

• Gas furnaces shall be installed by a licensed plumber or gas fitter only.

venting systems.

• The gas cock must be "T handle"

The following safety requirements must also be met when
the 15GCSX units are installed:

type.

• When flexible connectors are used, the maximum
length shall not exceed 36".

1 - Use only with the type of fuel approved for use with this
appliance, Refer to the unit rating plate,
2 - Position, locate and install the 15GCSX unit only as
outlined in these instructions.

Use the following guidelines to select a suitable location for
these units,

3 - Provide adequate clearance around the vent hood as
specified in these instructions.

1 - Unit is designed for outdoor installation only. Unit must
be installed so all electrical components are protected
from water.

4 - Do not use an open flame to check for gas leaks. Use a
commercially available soap solution, which has been
designed specifically to check for gas leaks, Refer to
the Gas Supply and Piping section,
5 - Check the unit operation after start-up to make sure
that the 15GCSX is operating within the intended temperature rise range. The duct system must be designed to provide an external static pressure within the
allowable range, Refer to the unit rating plate,

2 - Condenser coils must have an unlimited supply of air.
3 - For ground level installation, use a level pre-fabricated
pad or use a level concrete slab with a minimum thickness of 4 inches. The length and width should be at
least 6 inches greater than the unit base, Do not tie the
slab to the building foundation.
4 - Maintain level within a tolerance of 1/4 inch maximum
across the entire length or width of the unit,

Page 4

5 - Donotlocatetheunitwherethecombustion
airsupply
willbeexposedtoanycorrosivesubstance,
including
thefollowing:
Permanent
wavesolutions,
Chlorinated
waxesor cleaners,
Chlorine-based
swimmingpoolchemicals,
Water-softening
chemicals,
De-icingsaltsorchemicals,
Carbontetrachloride,
Halogen-type
refrigerants,
Cleaningsolvents(e.g.,perchloroethylene),
Printinginks,paintremovers,
varnishes,etc.,
Cementsandglues,
Anti-staticfabricsoftenersusedinclothesdryers,
Masonryacid-washing
materials,
Chlorinated
laundryproducts,
Hydrochloric
acid.

Exercisecarewhenmovingtheunit.Donotremoveany
packaging
untiltheunitisneartheplaceofinstallation.
An
optionallifting lug kit (92M51)may be purchased
separatelyfor use in riggingthe unit for lifting.The
spreader lengths must exceed the width across the top
of the unit. Recommended spreader lengths: for use with
2, 2-1/2 and 3-ton units -- 44"; for use with 3-1/2, 4 and 5-ton
units -- 54",

CAUTION

All units require certain clearances for proper operation
and service. Refer to figure 2 for the clearances required
for combustible construction, servicing, and proper unit
operation.
NOTE - Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet or vent outleL
Service

Clearances

36 (914)

48 (1219)

NOTE - Top Clearance - 36 in. (914 mm)
NOTE - Entire perimeter of unit base requires
support when elevated above mounting surface.

Figure 2
In the U.S. units may be installed on combustible flooring
made from wood or class A, B, or C roof covering material.
In Canada, units may be installed on combustible flooring.
The products of combustion are discharged
screened vent outlet in the front mullion.

through a

Install the unit so that the products of combustion will not
damage the outer building structure.
Accessory

Lift Kit

The vent outlet must be at least 4 feet below, 4 feet
horizontally from and 1 foot above any door, window or
gravity air inlet into the building. In addition, install the unit
so that the vent outlet is at least 3 feet above any forced air
inlet located within 10 feet.
Clearances to the vent outlet must also be consistent with
the requirements of the current National Fuel Gas Code
(Z223.1) and/or the standards of the current CSA B149
codes.
Figure 3 shows the minimum clearances to combustibles
required above and below the vent hood. The minimum
clearance in front of the vent hood is 24 inches.
Install the unit so that snow accumulation will not restric the

Figure

flow of the flue products. Allow a required minimum
horizontal clearance of 4 feet from electric meters, gas
meters, regulators and relief equipment. In addtion to the
above requirements, ensure that unwanted ice caused by
condensate is not allowed to accumulate around the unit.

Units may also be moved or lifted with a forklift while still in
the factory supplied packaging.
NOTE - Length of forks must be a minimum of 42 inches.
Page

Do not locate the unit on the side of the building where the
prevailing winter winds could trap moisture, causing it to
freeze on the walls or on overhangs (under eaves). The

vent outlet shouldnot dischargeflue productson a
sidewalk,patioor otherwalkwaywherethe condensate
couldcausethesurfacetobecomeslippery,
Do not install the unit so that the products of
combustionwill be allowedto accumulatewithin a
confinedspaceandrecirculate.
Minimum Clearances to Combustible Materials
Above and Below Vent Hood
Minimum Clearance
Above Vent Hood:
Distance from Top
of Vent
Hood
to Top of Unit

through the sides of the screen in order to hold the
screen in place.
The vent hood must be installed

prior to unit start-up.

If the 15GCSX unit is replacing an existing furnace which is
being removed from a venting system commonly run with
separate gas appliances, the venting system is likely to be
too large to properly vent the remaining attached appliances.
Conduct the following test while each appliance is operating and the other appliances (which are not operating) remain connected to the common venting system. If the venting system has been installed improperly, you must
correct the system as indicated in the general venting requirements section.

Minimum Clearance
Below Vent Hood:
Distance from Bottom
of Vent Hood to Base
of Unit

1 - Seal any unused openings in the common venting system.
2 - Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which
could cause an unsafe condition.

The vent hood, screen and screws are shipped inside the
unit in the plastic bag which contains the installation
instructions,

3 - 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 appliances 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.

1 - Insert the vent screen into the vent tube Once inserted, the screen should be flush with the end of the
tube as shown in figure 4.

4 - Follow the lighting instructions. Turn on the appliance
that is being inspected. Adjust the thermostat so that
the appliance operates continuously.

Figure

Vent Hood
Front

View

Top

View

_Vent

Vent
Screen

5 - After the main burner has operated for 5 minutes, test
for leaks of flue gases at the draft hood relief opening.
Use the flame of a match or candle, or smoke from a
cigarette, cigar, or pipe.

Installation

Tube

6 - After determining that each appliance connected to the
common venting system is venting properly, (step 3)
return all doors, widows, exhaust fans, fireplace dampers, and any other gas-burning appliances to their previous mode of operation.

NOTE Screws
should pass

Tube

is pre-formed

Vent Hood

Slotted

through

sides of
screen to
hold screen

7 - If a venting problem is found during any of the preceding tests, the common venting system must be modified to correct the problem.

side of

vent hood faces
condenser coil.

Resize the common venting system to the minimum
vent pipe size determined by using the appropriate
tables in Appendix G. (These are in the current standards
of
the
National
Fuel
Gas
Code

in place.

Figure 4
2 - Position the vent hood over the vent tube so that the
slotted side of the hood faces the condenser coil. Use
the four sheet metal screws (provided) to secure the
vent hood to the vent tube. The screws should pass
Page 6

ANSl-Z223.1/NFPA 54 in the USA, and the appropriate Category 1 Natural Gas and Propane appliances
venting sizing tables in the current standards of the
CSA B149 Natural Gas and Propane
Codes in Canada.)

Installation

The15GCSX
unitisequipped
witha 3/4inchFPTcoupling
forcondensate
lineconnection.
Plumbing
mustconformto
local codes.Use a sealingcompoundon malepipe
threads.
Thedrainlinemustbe properlytrappedandroutedtoa
suitabledrain.Seefigure5 forproperdrainarrangement.
Thedrain line mustpitchto an opendrainor pumpa
minimumof 1 inchper10feetto preventcloggingofthe
line.Thedrainlinemustbesupportedso thatweightof
drainline is not carriedby drainline connection.Seal
arounddrainconnection
withsuitablematerialto prevent
airleakageintoreturnairsystem.
Drainpipingshouldnotbesmallerthandrainconnection
at
coil.Anopenventindrainlinewillsometimesberequired
dueto line length,frictionand staticpressure.Drains
shouldbeconstructed
ina mannertofacilitate
futurecleaning.
NOTE - The condensate
provide proper drainage.

drain line MUST be trapped to

Minimum

Condensate

Unit Model
Filter Size
Filter Quantity
-24, -30, -36
20 in. X 25 in.
1
-42, -48, -60
16 in. X 25 in.
2
The Healthy Climate ® PureAir ¢ air purification system
(PCO20-28) may be used with 15GCSX units installed in
horizontal air discharge applications only. Installation
hardware kit (Y0629)is required to install the PCO20-28
(X8787) in the packaged unit. The PCO20-28 is designed
for universal voltage, and is ready to operate at 208/230V.
When used, the PCO should be installed before the unit is
set in place and before the duct connections are made.

The duct system should be designed and sized according
to the methods in Manual Q of the Air Conditioning
Contractors of America (ACCA).
A closed return duct system shall be used. This shall not
preclude use of economizers or outdoor fresh air intake. It
is recommended that supply and return duct connections
at the unit be made with flexible joints.
The supply and return air duct systems should be designed
for the CFM and static requirements of the job. They
should NOT be sized by simply matching the
dimensions of the duct connections on the unit.

CAUTION

Typical

Table 1
Unit Filter Size

Drain

CAUTION

Pitch

1 in. (25 ram) per
10' (3 m) of line

unit
open
vent
The 15GCSX unit is shipped ready for horizontal air
discharge (side duct connections). If bottom air discharge
is desired, the covers must be removed from the supply
and return air openings on the bottom of the unit and
re-installed to cover the side openings.

Trap must be deep enough to offset maximum
static difference (Generally, 3 inches minimum).

Figure

The upper return air opening cover must be removed when
the PureAir ¢ air purification system (PCO20-28) is being
used. In PCO applications, both upper and lower return air
openings must be covered by the return air plenum to
ensure proper PCO operation. The upper return air
opening is not required in horizontal applications when the
PCO is not used.

mounting
frame

Filters are not factory-supplied with the unit; however,
optional internally installed filter kits are available. Filter kit
92M54 is used with 2, 2-1/2 and 3-ton units. Filter kit 92M55
is used with 3-1/2, 4 and 5-ton units. The filter kits
accommodate the use of 1", 2" or 4" filters. If the optional
filter kit is not used, a filter must be field-installed.
Filters must always be installed ahead of evaporator coil
and must be kept clean or replaced. Dirty filters will reduce
the airflow of the unit. Filter sizes are shown in table 1.
Page 7

Removing Supply and Return
Air Opening Covers

1. Remove screw and lift.
2. Slide cover to free back pin.
Figure

Base----_

Units are shippedwith the compressormountings
factory-adjusted
andreadyforoperation.

CAUTION

ply pressure at the unit gas connection must be a minimum
of 5 inches w.c. and a maximum of 10.5 w.c. For LP/propane gas units, supply pressure at the unit gas connection
must be a minimum of 11 inches w.c. and a maximum of
13.0 inches w.c.
Table 3
Gas Pipe Capacity-FT
Nominal
Lengthin

Check the unit rating plate to confirm whether unit is
equipped for use with natural gas or LP/propane. If
conversion is required use the approved conversion kit.
NQ TE - Units are shipped equipped for natural gas, but can
be converted to LP/propane with a conversion kit. Conversion must be performed by an approved licensed pipe
fitter or technician.
All LP/propane gas equipment must conform to the safety
standards of the National Fire Protection Association.

Feet

1/2 in.

3 / HR

Iron Pipe Size (inches)
3/4in.

1 in.

1-1/4 in.

132

278

520

1050

190

350

730

152

285

590

130

245

5OO

115

215

440

105

195

400

180

370

Complete
information
regarding
tank
sizing
for
vaporization, recommended regulator settings, and pipe

170

350

160

320

sizing is available from most regulator manufacturers and
LP/propane gas suppliers.

100

150

305

Proper sizing of gas piping depends on the cubic feet per
hour of gas flow required, specific gravity of the gas and
length of run. In the United States, the current National Fuel
Gas Code Z223.1 should be followed in all cases unless

The gas supply piping should be routed through the grommet on the side of the unit. Refer to figure 7.
Gas Piping and Electrical

Conduit

Access

superseded by local codes or gas company requirements.
Refer to tables 2 and 3. In Canada, refer to the current CSA
B.149 installation codes.
Table 2
Gas Heat Application

Gas

Data

Unit
Heating Size

Input Rating
(Btu)

Output Rating
(Btu)

67,500

54,000

82,500

66,000

90,000

72,000

110

110,000

88,000

102

138

137,500

110,000

128

Thermostat/_'(_/_(_)
Entry

Gas Capacity*
(FT3/HR)

J
/
Line Voltage
Entry

Figure 7
When making piping connections, a drip leg should be
installed on vertical runs to serve as a trap for sediment or

*Based on 1075 Btu per cubic foot of natural gas.
Before connecting piping, check with gas company or authorities having jurisdiction for local codes or requirements,
When installing gas supply piping, length of run from gas
meter must be considered in determining pipe size for 0.5
inch w.c, maximum pressure drop, Do not use supply pipe
smaller than unit gas connection, For natural gas unit, sup-

condensate. A 1/8 inch N.P.T. tap accessible for test gauge
connection must be provided in field piping upstream from
gas supply connection to unit. Install a ground joint union
between gas control manifold and the manual main shutoff valve. See figure 8.
Compounds used on threaded joints of gas piping shall be
resistant to the action of propane/LP gases.

Page 8

The heating value of the gas may differ with locality, The
value should be checked with the local gas utility.

Drip Leg Installation
field provided
1/8 in. !

NOTE - There may be a local gas utility requirement specifying a minimum diameter for gas piping. All units require a
1/2 inch pipe connection at the gas valve.

ground joint
union
manual main
shut-off

unit

Gas piping recommendations:

-&CAUTION

leg
gas piping

1 - A drip leg and a ground joint union must be installed in
the gas piping,

support

Figure 8
Pressure

A ground joint union is recommended by the manifold/
valve.

Test Gas Piping

When pressure testing gas lines, the gas valve must be disconnected and isolated. Gas valve can be damaged if subjected to more than 0,5 psig (14 inch w,c,), See figure 9.
If test pressure is equal to or less than 0,5 psig (14 inch
w,c,) shutoff the manual main shut-off valve before pressure testing to isolate unit from gas supply system,
Isolate

Gas Valve To Pressure

Test

Manual Main Shut-off Valve Will Not Hold Test
Pressures in Excess of 0.5 PSIG (14 in. w.c.)

2 - When required by local codes, a manual shut-off valve
may have to be installed outside of the unit,
3 - Use pipe thread sealing compound resistant to propane gas sparingly on male threads,
4 - The gas supply should be a separate line and installed
in accordance with all safety codes. After the gas connections have been completed, open the main shut-off
valve admitting normal gas pressure to the mains,
Check all joints for leaks with soap solution or other
material suitable for the purpose.

Ak CAUTION

unit

gas valve

cap

5 - The unit and its individual manual shut-off valve must
be disconnected from the gas supply piping system
during any pressure testing d that system at test pressures in excess of 1/2 PSlG (3.48kPa).

Figure 9
NOTE - Codes may require that manual main shut off valve
and union (furnished by installer) be installed in gas line external to unit. Union must be of the ground joint type.

A IMPORTANT

, WARNING

After gas piping is complete, carefully check all piping connections (factory and field) for gas leaks, Use soap solution
or other preferred means.
NOTE - In case of emergency shutdown, shut off main
manual gas valve and disconnect main power to unit,
These devices should be properly labeled by installer,

Page 9

6 - A 1/8 inch N.P.T. plugged tapping, accessible for test
gage connections, must be installed immediately upstream of the gas supply connection to the furnace,

All wiring should be done in accordance with the
current National Electric Code ANSI/NFPA No. 70 in

See figure 10 for field connection of line voltage wiring, See
figure 11 for typical wiring diagram.
208/230

the United States. In Canada, wiring must be done in
accordance with the current CSA C22.2 Part 1. Local

Line Voltage

Wiring

contactor

codes may take precedence.
Use wiring with a temperature limitation of 75_C min.; run
the 208 or 230 volt, 60 hertz electric power supply through a
fused disconnect switch to control box of unit and connect
as shown in the wiring diagram located on the inside of the
control access panel,
Unit must be electrically grounded in accordance with local
codes or in the absence of local codes with the National
Electric Code, ANSI/NFPA No, 70 (latest edition) or CSA
C22.2 Part 1 (latest edition).
Power supply to the unit must be N.E,C, Class 1, and must
comply with all applicable codes. A fused disconnect
switch should be field provided for the unit, The switch must
be separate from all other circuits, If any of the wire
supplied with the unit must be replaced, replacement wire
must be of the type shown on the wiring diagram.
Electrical wiring must be sized to carry minimum circuit
ampacity
marked
on the
unit.
USE COPPER
CONDUCTORS ONLY, Each unit must be wired with a
separate branch circuit and be properly fused.

CAUTION

(furnished
CE_D

fused

by installer)

disconnect

switch

ground
lug

NOTE - ff 208 voltage is suppfied, transformer
connections must be made.

Figure

Thermostat
The room thermostat should be located on an inside wall
where it will not be subject to drafts, sun exposure or heat
from
electrical
fixtures
or
appliances.
Follow
manufacturer's instructions enclosed with thermostat for
general installation procedure, Color coded insulated wires
(# 18 AWG) should be used to connect thermostat to unit,
Four wires are required for cooling,
Heat Anticipator

Setting

It is important that the anticipator setpoint be correct. Too
high of a setting will result in longer heat cycles and a
greater temperature swing in the conditioned space,
Reducing the value below the correct setpoint will give
shorter "ON" cycles and may result in the lowering of the
temperature within the conditioned space.
Heat Anticipator Setting: 0.70 AMP

Page 10

15GCSX

Series Gas Packaged

Typical Wiring

(£:I

Diagram

Units

BLOWER

ICMP/N

CONTROL

HUM

CI (RC0m)

BOARD

(A54)
ADJUST
SELECTOR PINS
(Setting affects both
heating and cooling
modes)

AH4103

HEATING SPEED
SELECTOR PINS

DIAGNOSTIC
LED

COOLING SPEED
SELECTOR PINS

Figure

12
To change jumper positions, gently pull the jumper off the
pins and place it on the desired set of pins, The following
section outlines the different jumper selections available
and conditions associated with each one, Refer to figure
12,

WARNING

After the CFM for each application has been determined,
the jumper settings must be adjusted to reflect those given
in tables 4, 5 and 6, From the tables, determine which row
15GCSX units are equipped with a variable speed motor
that is capable of maintaining a specified CFM throughout
the external static range, A particular CFM can be obtained
by positioning jumpers (COOL, HEAT, and ADJUST) on
the blower control board. The HEAT and COOL jumpers
are labeled A, B, C and D. Each of the numbers corresponds with an air volume (CFM) setting. The ADJUST
jumper is labeled Test, -, +, and Norm. The + and - pin settings are used to add or subtract a percentage of the CFM
selected, The Test jumper is used to operate the motor in
the test mode. See figure 12,

most closely matches the desired CFM Once a specific
row has been chosen (% NORMAL, or-), CFM volumes
from other rows cannot be used, Below are descriptions of
the jumper selections,

Factory settings for the blower speed jumpers are given in
the wiring diagram in figure 11. Figure 12 shows the blower
control board. Use tables 4, 5 and 6 to determine the correct air volume for operation in heat and cool mode,

The ADJUST pins allow the motor to run at normal speed,
approximately 15 percent higher, or approximately 15 percent lower than normal speed, Tables 4, 5 and 6 give three
rows (% NORMAL, and -) with their respective CFM volumes. Notice that the normal adjustment setting for heat
speed position C in table 4 is 900 CFM The + adjustment
setting for that position is 1035 CFM and for the - adjustment setting is 765 CFM After the adjustment setting has
been determined, choose the remaining speed settings
from those offered in the table in that row.

The CFM LED located on the blower control board flashes
one time per 100 cfm to indicate selected blower speed,
For example, if the unit is operating at 1000 CFM, CFM
LED will flash 10 times, If the CFM is 1150, CFM LED will
flash 11 full times plus one fast or half flash.
At times the light may appear to flicker or glow. This takes
place when the control is communicating with the motor between cycles, This is normal operation,
Read through the jumper settings section before adjusting
the jumper to obtain the appropriate blower speed,

The variable speed motor slowly ramps up to and down
from the selected air flow during both cooling and heating
demand, This minimizes noise and eliminates the initial
blast of air when the blower is initially energized.
ADJUST

The TEST pin
run the motor
that the motor
shooting, The
to run,

Page 12

is available to bypass the blower control and
at approximately 70 percent to make sure
is operational. This is used mainly in troubleG terminal must be energized for the motor

COOL
TheCOOLjumperis usedto determinetheCFMduring
coolingoperation.Thisjumperselectionis activatedfor
coolingwhenY1is energized,
Theblowermotorrunsat80percent
oftheselected
airflow
forthefirst7-1/2minutes
ofeachcoolingdemand,
Thisfeatureallowsforgreaterhumidityremovalandsavesenergy,
In the coolingmode,the blowercontrolboarddelays
bloweroperation
for5secondsafterthecompressor
starts.
Theblowercontinues
tooperatefor90secondsafterthe
compressor
is de-energized,
HEAT
TheHEATjumperis usedto determineCFMduringgas
heatoperation
only.Thesejumperselections
areactivated
onlywhenW1isenergized,
In the heatingmode,the blowercontrolboarddelays
bloweroperationfor 30 secondsafter the flame is
established,The blowercontinuesto operatefor 90

secondsafterthegasvalveis de-energized,
CONTINUOUSFAN
Whenthethermostat
issetfor"Continuous
Fan"operation
andthereis nodemandforheatingor cooling,theblower
controlwillprovide50percentoftheCOOLCFMselected,
NQ TE - With the proper thermostat and subbase, continuous blower operation is possible by closing the R to G circuit, Cooling blower delay is also functional in this mode.
DEHUMIDIFICATION
The blower control board includes an HUM terminal which
provides for connection of a humidistat. The JV1 resistor
on the blower control board must be cut to activate the
HUM terminal, The humidistat must be wired to open on
humidity rise, When the dehumidification circuit is used,
the variable speed motor will reduce the selected air flow
rate by 25 percent when humidity levels are high. An LED
(D1) lights when the blower is operating in the dehumidification mode,

Table

15GCSXAV-24,
15GCSXAV-30
Blower Performance
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
Jumper Speed Positions
"COOL" Speed
"HEAT" Speed
ADJUST
A
B
C
D
A
B
C
Jumper
Setting cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+

NORM

"CONTINOUS
A

FAN" S )eed

B
L/s cfm

L/s

cfm

1150 545 920 435 690 325 1035 490 1265 595 1150 545 1035 490 920

435

575 270 460 215 345 165 520 245

1000 470 800 380 600 285 900 425 1100 520 1000 470 900 425 800

380

500 235 400 190 300 140 450 210

850 400 680 320 510 240 765 360 935 440 850 400 765 360 680

320

425 200 340 160 300 140 385 180

15GCSXAV-36

L/s cfm

cfm

L/s cfm

L/s

Table 5
Blower Performance

0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
Jumper Speed Positions
"COOL"
B

ADJUST
A
Jumper
cfm
L/s cfm
Setting
+

NORM

Speed
D

L/s cfm

L/s

cfm

"HEAT"
B

A
L/s

cfm

L/s cfm

NORM

L/s cfm

L/s

cfm

"CONTINOUS
B

FAN" Speed
C
D

L/s ufm L/s cfm

L/s

cfm

L/s

435 1265 575 1555 735 1265 595 1150 545 1035 490

690 325 575 270 460 215 635 300

1200 565 1000 470 800

380 1100 520 1350 635 1100 520 1000 470 900

425

600 285 500 235 400 190 550 260

1020 480 850 400 680

320

935 440 1150 540 935 440 850 400 765

360

510 240 425 200 350 165 470 220

Table

1380 650 1150 545 920

15GCSXAV-42,
15GCSXAV-48,
0 through 0.80 in. w.g. (0 through

"ADJUST"
Jumper
Setting

Speed
C

Jumper
"COOL"
A

Speed

B
cfm

2070

975

1840 870

1610 760

1800 850

1600 755

720 1360 640

1530

L/s

cfm

L/s

cfm

A
L/s

Speed

B
cfm

Blower Performance
Static Pressure Range

Speed Positions

"HEAT"

cfm

15GCSXAV-60,
200 Pa) External

"CONTINOUS

C
L/s

L/s

1380 650

2015

950 1900 895 1555 735

1400 660

1200 565

1750

1190 560

1020 480

1490

cfm

A
L/s

cfm

L/s

cfm

L/s

cfm

L/s

cfm

L/s

1325 625

1035

490

920 435

805

380

690

325

825 1650 780 1350 635

1150 545

900

425

800 380

700

330

600

285

700 1405 660 1150 540

980

765

360

680 320

595

280

510

240

Page 13

cfm

FAN" S 3eed

460

Blower Delay - Cooling

Thecoolingsectionis a complete
factorypackageutilizing
anair-cooledcondenser.
Thesystemis factory-charged
withR-410Arefrigerant.
Thecompressor
is hermetically
sealed, internally sprung and base-mountedwith
rubber-insolated
hold-down
bolts.
Pre-Start

Check List:

1 - Make sure refrigerant lines do not rub against the cabinet or each other.
2-

In the cooling mode, the circulating air blower operation is
delayed for 5 seconds after the compressor starts. The
blower continues to operate for 90 seconds after the
compressor is de-energized.
NOTE - With the proper thermostat and subbase, continuous blower operation is possible by closing the R to G circuit. Cooling blower delay is also functional in this mode.
System

Inspect all electrical wiring, both factory- and fieldinstalled, for loose connections.

3 - Check voltage at the disconnect switch. Voltage must
be within the range listed on the unit nameplate. If not,
consult power company and have voltage condition
corrected before starting unit.

Performance

For maximum performance of this cooling system, the
operating temperatures and pressure should be checked
and superheat determined at Standard ARI test conditions
of 82 '_ F outdoor temperature with minus (-)80 '_ F indoor
dry bulb / 67 _ F indoor wet bulb. If superheat measured
deviates from values in table 7, refrigerant charge should
be adjusted accordingly for maximum performance.

4 - Recheck voltage with unit running. If power is not within the range listed on the unit nameplate, stop the unit
and consult the power company. Check unit amperage. Refer to unit nameplate for correct running amps.

Table
Suction

Superheat

6 - Before placing the unit into full operation, energize the
unit for three false starts. Energize the compressor
just long enough for it to make a few revolutions, wait
five to seven minutes before repeating a second and
third time.
Cooling Sequence of Operation
When the thermostat calls for cooling, "R" is closed to "G"
and "Y" (figure 11 ). This completes the low voltage control
circuit, energizing the compressor, condenser fan motor
and blower motor.
NOTE - At the start of the each cooling demand, the
combustion air blower (draft motor) will operate for 10
seconds.
Unit compressors have internal protection. If there is an
abnormal rise in the compressor
temperature,
the
protector will open and the compressor will stop.

Values

Suction Superheat
82°F OD minus 80"F IDDB
/ 67"F IDWB

Unit Model No.

5 - Make sure filter is in place before unit start-up.

15GCSX-24
15GCSX-30

15 o

15GCSX-36
15GCSX-42

12°

15GCSX-48
15GCSX-60

10 °

Verify system performance using table 8 as a general
guide. Table 8 should not be used for charging unit. Minor
variations in these pressures may be expected due to differences in installations. Significant differences could
mean that the system is not properly charged or that a problem exists with some component in the system.
Used carefully, this table could serve as a useful service
guide. Data is based on 80°F dry bulb / 67°F wet bulb return
air. Allow unit operation to stabilize before taking pressure
readings.

Table 8
Normal Operating
80°F db / 67°F wb RETURN AIR
UNIT
PRESSURE
15GCSX-24
15GCSX-30
15GCSX-36
Suction
15GCSX-42
15GCSX-48
15GCSX-60
15GCSX-24
15GCSX-30
15GCSX-36
15GCSX-42
Liquid
15GCSX-48
15GCSX-60

65
142
134
143
140
140
143
219
232
244
225

70
143
136
144
140
141
144
242
255
268
247

75
144
138
146
140
142
145
264
277
292
269

243
257

264
280

285
303

Pressures

Air Temperature Entering Outdoor Coil (°F)
80
82
85
90
95
100
146
146
147
148
149
150
140
141
142
144
146
148
147
148
149
151
152
155
141
141
141
142
142
143
144
144
145
146
147
148
146
146
147
147
148
149
287
296
310
333
355
379
300
309
323
345
368
390
316
326
340
363
369
410
291
300
314
337
357
383
307
326

Page 14

315
335

328
349

349
372

370
395

391
418

105
151
149
155
144
149
150
398
408
429
402

110
152
151
157
145
150
151
430
440
461
434

115
153
152
157
147
151
152
457
470
493
457

408
436

440
468

470
497

Pre-Start

Check

List:

1 - Check the type of gas being supplied, Be sure it is the
same as listed on the unit nameplate,

5 - Set room thermostat to desired temperature, (If thermostat setpoint temperature is above room temperature after the pre-purge time expires, main burners will
light),
Honeywell

2 - Make sure the vent hood has been properly installed,
FOR YOUR SAFETY

READ BEFORE

VR8205

Series Gas Valve

HIGH FIRE
ADJUSTING SCREW
(under cap)

LIGHTING

BEFORE LIGHTING smell all around the appliance area
for gas, Be sure to smell around the base of the unit because some gas is heavier than air and will settle down low,

OUTLET
(MANIFOLD)
TAP

,WARNING

LOW FIRE
(under cap)
INLET

._URE
TAP

GAS VALVE SHOWN

Figure

IN OFF POSITION

To Shut Down:
1 - Turn off electric power to unit.
2 - Turn the gas valve knob to the OFF position.

,WARNING

Post Start-up

Check

List (Gas)

After the control circuit has been energized and the heating
section is operating, make the following checks:
1 - Use soap solution to check for gas leaks in the unit piping as well as the supply piping,

WARN ING

2 - Check for correct manifold gas pressures, See "Manifold Gas Pressure Adjustment."
3 - Check the supply gas pressure. It must be within the
limits shown on rating nameplate. Supply pressure
should be checked with all gas appliances in the building at full fire, At no time should the supply gas pressure exceed 10.5 inches w,c,, nor drop below 5.0 inches w,c. for natural gas units, For propane gas, supply
gas pressure should not drop below 11 inches w.c. If
gas pressure is outside these limits, contact your gas
supplier for corrective action.
4 - Adjust temperature rise to the range specified on the
rating plate,
Checking

Use only your hand to turn the gas valve knob, Never use
tools. If the knob will not move by hand, do not try to repair
the gas valve. Call a qualified service technician, Force or
attempted repair may result in a fire or explosion,
This furnace is equipped with a direct ignition control, Do
not attempt to manually light the burners,
1 - Turn off electrical power to unit.
2 - Set thermostat to lowest setting.
3 - Turn the gas valve knob to the ON position, Refer to
figure 13,
4 - Turn on electrical power to unit,

and Adjusting

Gas Input

NQ TE - Units must be converted for use with LP/propane
gas. Conversion kit is ordered separately. Conversion
must be performed by an approved licensed pipe fitter
or technician.
The minimum permissible gas supply pressure is 5,0
inches W.C. for natural gas or 11,0 inches W,C. for
LP/propane gas, The maximum inlet gas supply pressure
is 10.5 inches W,C, for natural gas and 13,0 inches W.C. for
LP/propane gas, Gas input must never exceed the input
capacity shown on the rating plate,
Units fueled by natural gas are rated for manifold pressures
of 2,0 inches W,C, for first stage and 3,5 inches W,C. for
second stage,

Page 15

Unitsfueledby LP/propane
gasare ratedfor manifold
pressures
of5.6inchesW.C.forfirststageand10.0inches
W.C.forsecondstage.
Measuremanifoldpressure:Shutoffgassupplyto the
unit. Removeplug from pressuretap. See figure 13.
Connectmanometer
orgaugetotheproperpressuretap,
thenturnonthegassupply.
TheHoneywell
VR8205gasvalvehasseparateadjusting
screwsfor firststage(LO)andsecondstage(HI).The
adjustingscrewsare positionedon eitherside of the
barbedfitting.Turn the adjustingscrewsclockwiseto
increasepressureand input;turn counterclockwise
to
decreasepressureand input. The pressureregulator
adjustment
is sensitive.Oneturnof theadjustingscrew
resultsina largechangeinmanifoldpressure.
Finalfirst-stageand second-stage
manifoldpressures
mustbe withinthe allowablerangersfor the gas being
used.
ForNaturalGas:Checkthefurnaceratebyobserving
gas
meter,makingsureallothergasappliances
areturnedoff.
Thetesthandonthemetershouldbetimedforatleastone
revolution,
Notethenumberofsecondsforonerevolution,
BTU/HR =
INPUT

Cubic Feet Per Revolution

X 3600 X Heating Value

No. Seconds Per Revolution

The heating value of your gas can be obtained from your
local utility.
For LP/Propane Gas: If a gas meter is available, check the
input rate as described in the section above. Heating value
of propane gas is available from propane supplier. Otherwise, the only check for the output rate is to properly adjust
the manifold pressure using a manometer. Typical manifold setpoint for installations at altitudes from 0 to 4500 feet
above sea level is 10.0 inches W.C.
High Altitude

Information

Ratings shown on the rating plate for elevations up to 4,500
feet. For elevations above 4,500 feet, ratings should be
reduced at a rate of four percent for each 1,000 feet above
sea level. See National Fuel Gas Code Z223.1 (latest
edition) or the requirements of the CSA B149 installation
codes.
Heating

Sequence

of Operation

When the thermostat calls for heating, Wl is energized.
NOTE - The ignition control ignores a carl for second-stage
heat until first-stage heat has been established.
The ignition control checks high temperature limit and
rollout switches to make sure they are closed. The control
then verifies that the pressure switch is open. If the
pressure switch is closed, the control will flash code 3 on
the LED and will wait indefinitely for the pressure switch to
open. If the pressure switch is open, the control proceeds
to the 15-second pre-purge.
The ignition control energizes the combustion air inducer
on high speed, flashes a code 3 on the LED, and waits for
the pressure switch to close.
When the pressure switch has closed, the LED code 3 flash
stops and the control begins the 15-second pre-purge

period. When the pre-purge time has expired, the control
begins the ignition trial.
The ignition control energizes the gas valve and spark. The
control ignores the flame sense signal for the first two
seconds of the ignition trial. If the flame is established
within 10 seconds, the control de-energizes the spark. If
flame is not established within 10 seconds, the gas valve
and spark are de-energized and the ignition control
initiates a 30-second inter-purge sequence.
Approximately 30 seconds after the flame has been
established, the circulating air blower starts and the
combustion air inducer is switched to low speed. The
ignition control inputs are continuously monitored to
ensure that limit switch(es), rollout switch and pressure
switch are all closed, and that the flame remains
established and heating demand is present. First-stage
gas valve, low-speed combustion
air inducer and
circulating blower remain energized. If the thermostat
signals a requirement for second-stage heat (W2), the
ignition control initiates high heat operation.
When a signal for second stage heat is received by the
ignition control, the control energizes the second-stage
gas valve and high-speed combustion air inducer until the
demand is satisfied.
If a first-stage
heat demand continues after the
second-stage heat demand has been satisfied, the ignition
control immediately de-energizes the second-stage gas
valve. The combustion air inducer is held in high speed
operation for an additional 1 second after the second-stage
gas valve is de-energized. First-stage heat operation
(first-stage gas valve and low-speed combustion air
inducer) continues until heating demand is satisfied.
When the heating demand is satisfied, the control
immediately de-energizes the gas valve. The combustion
air inducer remains energized for a 30-second post-purge
period. The circulating air blower operates for 90 seconds
after the gas valve is de-energized.
Blower

Delay

- Heating

In the heating mode, the circulating air blower operation is
delayed for 30 seconds after the flame is established. The
blower continues to operate for 90 seconds after the gas
valve is de-energized.
NOTE - With the proper thermostat and subbase, continuous blower operation is possible by closing the R to G circuit.

Blower Control

Board (A54)

15GCSX units are equipped with a variable speed motor
which is controlled by a blower control board. Blower control board settings and operation are given on page 12.
Ignition

Control

Board (A3)

The 15GCSX unit includes an ignition control board which
controls the combustion air inducer, gas valve and spark
electrode. It receives signals from the main and auxiliary
limit switches, the rollout switch, the pressure switch and
the flame sensor. LED codes and flash rates are given on
page 17. The ignition control board is shown in figure 14.

Page 16

Ignition

Control

Board
CONNECTOR

i( hill
t

P!N
P}N
P}N
P}N
P}N
P}N
PiN
P}N
P}N

-I;,,°°

PI
I
2
5
4
5
6
7
8
9

CONNECTOR
'R"
'W"
'W2"
"G"
'Y"
QUICK

LIMIT
SW}TCB
(OUTPUT,
COMMON
WITH
"W"
TERMINAL1
GAS
VALV _ Z4
VAC
COMMON
(CHASSIS
GROUND}
_OW
GAS
VALVE
OUTPUF
_IMil
SW}FCN
}NPUF
PRESSURE
SWITCH
OUIPU]
_OW
PRESSURE
SWI]CH
INPUT
HIGH
GAS
VALVF
OUFPU]
HIGH
PRESSURE
SW}ICH
INPUF
(OPFIONAL)
FLAME
SENSF
INPU]

P2
24VAC TO THERMOSTAT
FHERMOS]Aq CALL FOR HEAT
rHERMOSTAq
2ND SIAGE CALL FOR
THERMOSTAT
CALL FOR CONTINUOUS
FHEI:_MOSTAI CALL FOR COOLING

CONNECT
"INDUCER
"INDUCER
"11"
(2}
"L2"
(4)
"C"
(2}
"24VAC"
"CIR _'

HEA]
FAN

TERMINALS
LOW ¸'
DRAFT
}NDUCER
MOTOR
OUTPUT
NIGH"
2ND
STAGE
DRAFT
INDUCER
MOTOR
230
VAC LINE
}NPUT
230
VAC LINE
}NPUT
24
VAC
SYSTEM
COMMON
(GROUND}
CONTINUOUS
24VAC
PROM
IRANSFORMER
CIRCULATING
AIR
BLOWER
MOTOR

OUTPUT

T}M!NGS:
PREPURGE:
JGN}T}ON
TR}AI
INTERPURGE:
HEAT
SLOWER
ON
DELAY
HEAT
SLOWER
OFF ¸ DELAY
POST
PURGE
COOL
RAN
OFF
DELAY

Figure

}5
I0
30
30
90
30
90

SECONDS
SECONDS
SECONDS
SECONDS
SECONDS
SECONDS
SECONDS

Ignition Control Board LED Codes
The ignition control board LED flashes codes which indicate normal or abnormal operations:

supply airflow, occurs. The main gas valve is closed. The
circulating air blower will continue to operate until the
blower off delay period has elapsed.

Slow Flash -- Normal operation, no carl for heat.
One flash per second.
Fast Flash -- Normal operation, call for heat.
Two flashes per second.
Steady Off -- Internal failure or no power.
(Micro-controller failure; self-check.)
Steady On -- Internal control failure.
(Micro-controller failure; self-check).
Code 2 -- System lockout - Failed to detect or sustain
flame.
Two flashes in 1 second with a 1-second pause.
Code 3 -- Pressure switch open with inducer on or
closed with inducer off.
Three flashes in 1-1/2 seconds with a 1-second pause.
Code 4 -- High limit/or rollout switch open.
Four flashes in 2 seconds with a 1-second pause.
Code 5 -- Flame sensed while gas valvede-energized.
Five flashes in 2-1/2 seconds with a 1-second pause.
Code 6 -- Rollout switch is open.
Six flashes in three seconds with a one-second pause.
Limit Control

Pressure

This control is located inside the heating compartment and
is designed to open at abnormally high air temperatures. It
resets automatically. The limit switch operates when a high
temperature condition, caused by inadequate blower

This control is located in the side of the circulating air
blower housing. If the circulating air blower fails to operate,
the temperature rises and opens the auxiliary limit. The
main gas valve closes. This control resets automatically.

Switch

If the combustion air inducer motor should fail or if the vent
system is blocked, the pressure switch prevents the gas
valve from being energized.
Spark Electrode

and Flame Sensor

Rod

The spark electrode and flame sensor rod are part of the
burner assembly. The spark electrode is typically located
on the far-left burner. The flame sensor rod is typically
located on the far-right burner. If the ignition control does
not receive a signal from the flame sensor indicating that
the burners have established flame, the main gas valve will
close after the 10-second ignition trial period built into the
ignition control.
Rollout

Switch

The switch is located above the main burners. In the event
of a sustained main burner rollout the main gas valve is
closed. To reset, push the button on top of the switch.
Auxiliary

Page 17

Limit (-42, -48 & -60 units only)

System

Operation

Monitor

LSOM LED Functions

(LSOM)

The system operation monitor (A132) detects the most
common fault conditions in the air conditioning system.
When an abnormal condition is detected, the module communicates the specific condition through its ALERT and
TRIP lights. The module is capable of detecting both mechanical and electrical system problems, See figure 15 for
the system operation monitor,
System

Operation

POWER

Monitor

(A132)

LED

DATA OUTPUT

--DATA
OUTPUT
CONNECTOR
_'.25"SPADE

Power LED (green) -- Voltage within the range of
19-28VAC is present at the system monitor power connection,
Alert LED (yellow) -- Communicates an abnormal system
condition through a unique flash code. The alert LED
flashes a number of times consecutively; then pauses;
then repeats the process, This consecutive flashing corresponds with a particular abnormal condition.
Trip LED (red) -- Indicates a demand signal from the thermostat; but detects no current to the compressor.
Flash code number -- Corresponds to a number of LED
flashes, followed by a pause, and then repeated,
Trip & Alert LEDs flashing simultaneously -- Indicates that
the control circuit voltage is too low for operation,

CONNECTOR(5)

R
ALERT

Reset ALERT flash code by removing 24VAC power from
monitor. Last ALERT flash code will display for 1 minute after monitor is powered on.

LED

TRIP LED

Figure

LSOM codes are given in table 9,

IMPORTANT
The top of the condenser fan should be 1-1/2 inchs from the
bottom of the top grille, This dimension should be checked
and the fan should be adjusted accordingly any time servicing of the outdoor fan system is required,

Page 18

Table 9
System
Status

LED Condition

Green "Power"

LED ON

Green "Power" LED
OFF
Red "Trip" LED ON

Red "Trip" & Yellow
"Alert" LEDs Flashing
Yellow "Alert" Flash
Code 1"

Status

Operation

Monitor

LED Description

LED Troubleshooting

Status

24VAC control power is present at the module terminal.

Module not powering up

Determine/verify that both R and C module terminals are connected
and voltage is present at both terminals.

System and compressor
check out OK

1.
2.
3.
demand

Verify
Verify
Verify
signal

Thermostat demand signal
Y1 is present, but compressor not running

1.
2.
3.
4.
5.
6.

Compressor protector is open.
Outdoor unit power disconnect is open.
Compressor circuit breaker or fuse(s) is open.
Broken wire or connector is not making contact.
Low pressure switch open if present in the system.
Compressor contactor has failed to close.

Simultaneous

Indicates

flashing.

Long Run Time Compressor is running
extremely long run cycles

6.
7.

System Pressure Trip Discharge or suction
pressure out of limits or
compressor overloaded

Short Cycling - Compressor is running only briefly

1.
2.
3.
4.

Yellow "Alert"
Code 4*

Flash

Locked Rotor

2.
3.
4.

Yellow "Alert"
Code 5*

Flash

Open Circuit

circuit

voltage

is too low for operation.

aged).
3.
5.

Flash

that the control

High head pressure.
Condenser coil poor air circulation (dirty, blocked, dam-

Yellow "Alert"
Code 3*

Y terminal is connected to 24VAC at contactor coil.
voltage at contactor coil falls below 0.5VAC when off.
24VAC is present across Y and C when thermostat
is present; if not present, R and C wires are reversed.

Low refrigerant charge.
Evaporator blower is not running.
Evaporator coil is frozen.
Faulty metering device.
Condenser coil is dirtyLiquid line restriction (filter drier blocked if present)Thermostat is malfunctioning,

2.
3.
5.

Flash

Information

Module has power

Yellow "Alert"
Code 2*

LED Troubleshooting

Codes

2.
3.
4.
5.
6.

Condenser fan is not running.
Return air duct has substantial leakage.
If low pressure switch is present, see Flash Code 1 info.
Thermostat demand signal is intermittent.
Time delay relay or control board is defective.
If high pressure switch is present, see Flash Code 2 info.
If low pressure switch is present, see Flash Code 1 info.
Run capacitor has failed.
Low line voltage (contact utility).
Excessive liquid refrigerant in the compressor.
Compressor bearings are seized.
Outdoor unit power disconnect is open.
Unit circuit breaker or fuse(s) is open.
Unit contactor has failed to close.
High pressure switch is open and requires manual reset.
Open circuit in compressor supply wiring or connections.
Unusually long compressor protector reset time due to
extreme ambient temperature.
Compressor windings are damaged.

Yellow "Alert"
Code 6*

Flash

Open Start Circuit Current only in run circuit

1.
2.
3.

Run capacitor has failed.
Open circuit in compressor start wiring or connections.
Compressor start winding is damaged.

Yellow "Alert"
Code 7*

Flash

Open Run Circuit
only in start circuit

1.
2.

Open circuit in compressor start wiring or connections.
Compressor start winding is damaged.

Yellow "Alert"
Code 8*

Flash

Welded Contactor Compressor always runs

1.
2.

Compressor contactor failed to open.
Thermostat demand signal not connected to module.

Yellow "Alert"
Code 9*

Flash

Low Voltage - Control
circuit <17VAC

1.
2.

Control circuit transformer is overloaded.
Low line voltage (contact utility).

- Current

*Flash code number corresponds to a number of LED flashes, followed by a pause, and then repeated. Reset ALERT flash code
by removing 24VAC power from monitor; last code will display for 1 minute after monitor is powered on.

Page 19

The GCSX15unit shouldbe inspectedannuallyby a
qualifiedservicetechnician
toensureproperoperation,
Filters
Not supplied. Inspect once a month. Replace disposable,
or clean permanent-type, as necessary. DO NOT replace
permanent type with disposable.
Motors
Indoor, outdoor fan and vent motors are permanently
lubricated and require no further lubrication. Motors should
be cleaned yearly to prevent the accumulation of dust and
dirt on the windings or motor exterior.

to establish normal burning conditions. Observe the burner
flames. Compare this observation to figure 16 to determine
if flame is properly adjusted. Flame should be predominantly blue in color and strong in appearance. Verify that all
burnres are lit and that the flame does not impinge on the
sides of the heat exchanger.
Distorted flame or yellow tipping of the natural gas flame (or
long yellow tips on LP/propane flame) may be caused by
one or more of the following: lint or dirt inside the burner or
burner ports; lint or dirt at the air inlet between the burner
and manifold pipe; or an obstruction over the burner orifice.
Use a soft brush or vacuum to clean the affected areas.
Burner

Flame

Heat

Coil
Burner

Dirt and debris should not be allowed to accumulate on the
coil surfaces or other parts in the air conditioning circuit.
Cleaning should be performed as often as necessary. Use
a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean the coil, be sure the power
to unit is shut off prior to cleaning.

Gas
Manifold

NOTE - Care should be used when cleaning the coil so that
the coil fins are not damaged.
Do not permit the hot condenser air discharge to be obstructed by overhanging structures or shrubs.
To Clean

Burners

Light the burners and allow unit to operate for a few minutes

_,/

Exchanger

Burner Flame
(Blue Only)
Figure

Vent Outlet
Visually inspect vent outlet periodically to make sure that
the there is no buildup of soot and dirt. If necessary, clean
to maintain adequate opening to discharge flue products.

The following repair parts are available from your local dealer. When ordering parts, include the complete model number
and serial number which are printed on the unit rating plate.
Controls

Blower Components

Rollout Switch
Transformer
Limit Control
Gas Valve
Ignition Control
Electrode
Flame Sensor

Blower Housing Assembly
Blower Wheel
Blower Motor
Blower Motor Mount
Blower Motor Capacitor (if used)
Combustion Air Inducer
Fan Blade
Fan Motor

Auxiliary Limit
Pressure Switch
Blower Control

Fan Motor Capacitor

System Operations Monitor

Heating Components
Gas Manifold
Main Burner Orifices
Main Burners
Heat Exchanger
Cooling Components
Compressor
Evaporator Coil
Drier
Expansion Valve
Contactor
Capacitor
Condenser Coil

Accessories
Description
LP/Propane Gas Conversion Kit (heat sizes 68 and 90)
LP/Propane Gas Conversion Kit (heat sizes 83, 110 and 138)
Filter Kit (2-ton to 3-ton capacity units)
Filter Kit (3-1/2-ton to 5-ton capacity units)
PCO20-28
Installation Hardware Kit for PCO20-28
Page 20

LENNOX Cat.
Number
92M52
92M56
92M54
92M55
X8787
Y0629

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LENNOX Package Units(both Units Combined) Manual L0806697

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