American Standard YCZ036F1 Operating and safety instructions

All phases of this installation must comply with the NATIONAL, STATE & LOCAL CODES. In the absence of local codes, the
installation must conform with National Electric Code -- ANSI/NFPA 70 or "LATEST REVISION."
Since the manufacturer has a policy of continuous
product improvement, it reserves the right to change
specifications and design without notice.
© American Standard Inc. 1999
HAZARDOUS VOLTAGE - DISCONNECT POWER BEFORE SERVICING
WARNING:
INSTALLATION
OPERATION
MAINTENANCE
ALL phases of this installation must comply with
NATIONAL, STATE AND LOCAL CODES
IMPORTANT—ThisDocumentiscustomerpropertyandistoremainwiththisunit. Pleasereturntoserviceinformationpackuponcompletion ofwork.
Single PackageTwo Stage
Gas/Electric 16 SEER
Convertible 3 & 5Ton
Model: YCZ036F1/3M0B
YCZ060F1/3M0B
BAYLIFT002A
LIFTING LUG KIT
18-EB21D4-2
Library
Product Section
Product
Model
Literature Type
Sequence
Date
File No.
Supercedes
Service Literature
Unitary
Packaged Gas/Electric
YCZ
Installation, Operation, Maintenance
1A
July 1999
SV-UN-RT-YCZ-IOM-1A 7/99
YCZ-IOM-1
YCZ-IOM-1A

Page 2
INSPECTION
1. Checkfordamageaftertheunitisunloaded.Reportpromptly,to
the carrier, any damage found to the unit. Do not drop the unit.
IMPORTANT: Theuseof“spreaderbars”isrequiredwhen
hoisting the unit (to prevent damage to sides and top).
2. Check the unit’s nameplate to determine if the unit is correct for
theintendedapplication.Thepowersupplymustbeadequatefor
both the unit and all accessories.
3. Checktobesuretherefrigerantchargehasbeenretainedduring
shipment. Access to 1/4" flare pressure taps may be gained by
removing the furnace compartment access panel.
GENERAL INFORMATION
IMPORTANT: Read this entire manual before beginning
installation procedures.
▲ WARNING: BODILY INJURY CAN RESULT FROM
HIGH VOLTAGE ELECTRICAL COMPONENTS, FAST MOVING FANS,
AND COMBUSTIBLE GAS. FOR PROTECTION FROM THESE
INHERENT HAZARDS DURING INSTALLATION AND SERVICING,
THE ELECTRICAL SUPPLY MUST BE DISCONNECTED AND THE
MAIN GAS VALVE MUST BE TURNED OFF. IF OPERATING CHECKS
MUST BE PERFORMED WITH THE UNIT OPERATING, IT IS THE
TECHNICIANS RESPONSIBILTY TO RECOGNIZE THESE HAZARDS
AND PROCEED SAFELY.
IMPORTANT: DONOT CONNECT GAS PIPINGTO THE UNIT
UNTIL A LINE PRESSURE TEST HAS BEEN COMPLETED.
DAMAGE TO THE GAS VALVE MAY RESULT IN AN UNSAFE
CONDITION. THIS UNIT SHOULD NEVER BE EXPOSED TO
GAS LINE PRESSURE IN EXCESS OF 14 INCHES WATER
COLUMN. (1/2 PSIG)
IMPORTANT: RECONNECT ALL GROUNDING DEVICES.
ALLPARTSOFTHISPRODUCTCAPABLEOFCONDUCTING
ELECTRICAL CURRENT ARE GROUNDED. IF GROUNDING
WIRES, SCREWS, STRAPS, CLIPS NUTS OR WASHERS
USED TO COMPLETE A PATH TO GROUND ARE REMOVED
FORSERVICE,THEYMUSTBERETURNEDTOTHEIRORIGI-
NAL POSITION AND PROPERLY FASTENED.
IMPORTANT: ALLPOWERLEGSMAYNOTBE BROKENBY
CONTACTORS. SEE WIRING DIAGRAM ON UNIT CONTROL
BOX COVER.
THIS UNIT, AS SHIPPED FROM THE FACTORY, IS DE-
SIGNED FOR NATURAL GAS ONLY.
BEFORESTARTINGTHECOMPRESSOR,THECRANKCASE
HEATER SHOULD BE ENERGIZED FOR EIGHT HOURS
Read this manual carefully before attempting to install, operate, or
perform maintenance on this unit. Installation and maintenance
should be performed by qualified service technicians only.
NOTE: “Warnings” and “Cautions” appear at appropriate
places in this manual. Your personal safety and the proper
operationofthisairconditioningproduct requirethat youfollow
them carefully. The manufacturer assumes no liability for
installations or servicing performed by unqualified personnel.
Asshippedfromthe factory,thisunitisforusewithnaturalgasonly,
and is listed by Underwriters Laboratory.
Model YCZ heating/cooling units are designed for outdoor mount-
ing with a vertical condenser discharge. They can be located either
at ground level or on a roof, in accordance with local codes or
National Fuel Gas Code (ANSI-Z223.1A) Latest Revision. Since
these units are designed exclusively for outdoor operation, addi-
tional flue venting systems are not required. Each unit contains an
operating charge of Refrigerant-22 as shipped.
The following warning complies with State of California law, Proposition 65.
▲ WARNING: This product contains
fiberglass wool insulation! Fiberglass dust and ceramic
fibers are believed by the State of California to cause
cancer through inhalation. Glasswool fibers may also
cause respiratory, skin, or eye irritation.
PRECAUTIONARY MEASURES
● Avoid breathing fiberglass dust.
● Use a NIOSH approved dust/mist respirator.
● Avoid contact with the skin or eyes. Wear long-
sleeved, loose-fitting clothing, gloves, and eye
protection.
● Wash clothes separately from other clothing: rinse
washer thoroughly.
● Operations such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiring
additional respiratory protection. Use the appropriate
NIOSH approved respirator in these situations.
FIRST AID MEASURES
Eye Contact - Flush eyes with water to remove dust.
If symptoms persist, seek medical
attention.
Skin Contact - Wash affected areas gently with soap
and warm water after handling.
The following warning complies with State of California law, Proposition 65.
▲ WARNING: Hazardous Gasses!
Exposure to fuel substances or by-products of incomplete
fuel combustion is believed by the state of California to
cause cancer, birth defects, or other reproductive harm.
HAZARDOUS VOLTAGE - DISCONNECT POWER BEFORE SERVICING
WARNING:

Page 3
TYPICAL ROOFTOP INSTALLATION WITH BAYCURB030A,038A
(YCZ036,060F Models)
TYPICAL ROOFTOP INSTALLATION WITH FULL PERIMETER CURBS
(YCZ036,060F Models)
➀
ROOF INSULATION
ROOF DECK
FIELD SUPPLIED
RIGID INSULATION
SUPPLY AIR
DUCT RETURN AIR
DUCT
ROOF MOUNTING
CURB
FIELD SUPPLIED
CANT STRIP
FIELD SUPPLIED
SUPPORTS
AT EACH END
OF CURB
ROOFING
ROOF INSULATION
ROOF DECK
FIELD SUPPLIED
RIGID INSULATION
SUPPLY AIR
DUCT RETURN AIR
DUCT
ROOF MOUNTING
CURB
FIELD SUPPLIED
CANT STRIP
FIELD SUPPLIED
SUPPORTS
AT EACH END
OF CURB
ROOFING
SEE NOTE 1
SEE NOTE 2
NOTES:
1. The YCZ036F models extend out past this end of the
curb ONLY.
2. Only the YCZ060F models extend past both the end
and the side of the curb as illustrated.
➁

Page 4
YCZ036,060F OUTLINE – BACK
DIMENSIONAL DATA
➂
LEDOM
)SBL(THGIEWRENROC
TEN TINU THGIEW )SBL(
ABC D E F G H J K L MN P
1W2W3W4W
G630ZCY161601401751825466361/3-9261/9-8161/1-1161/9-68/1-11712/1-812/1-522/1-71013 4/3-8
G060ZCY5919212319916568/1-56548/3-3361/1-1261/1-5161/51-48/1-961/51-124/3-222/1-5202412/1-361/5-8
YCZ036F
YCZ060F

Page 5
YCZ036,060F OUTLINE – FRONT
➃
DIMENSIONAL DATA
OTECNARAELC LAIRETAMELBITSUBMOC MOTTOB"0.0
KCAB"0.1
EDISTFEL"0.6
EDISTHGIR"0.6
EDISTNORF"0.21
POT"0.63
ECNARAELCECIVRESDEDNEMMOCER
KCAB"0.6*
EDISTFEL"0.03
EDISTHGIR"0.42
EDISTNORF"0.24
YROSSECCARIAHSERFHTIW"81*
REZIMONOCEHTIW"03*
LEDOM
ABCD
M-G630ZCY466361/3-922/1-72
M-G060ZCY8/1-56548/3-3361/51-72

Page 6
REQUIRED CLEARANCE FOR UNIT INSTALLATION
AND ROOF PENETRATION HOLE SIZE REQUIRED
CONVERTING HORIZONTAL TO DOWNFLOW
➄
➅
EF
HOLE IN ROOF
WOOD NAILER
SIDE RAIL
SERVICE
CLEARANCE
LINES
SERVICE
CLEARANCE
LINES
A
B
C
D
SUPPLY AIR
RETURN AIR
SNOISNEMIDNOITARTENEP&ECNARAELCECIVRES
.ONLEDOMABCDEF
F630ZCY"03"03"21*"03"44"52
F060ZCY"24"03"21*"63"05"52
YROSSECCARIAHSERFHTIW"81* REZIMONOCEHTIW"03*
HEATER EXCHANGER
TUBES
HORIZONTAL SUPPLY
AIR COVER
HORIZONTAL RETURN
AIR COVER
SHEET METAL
SCREWS
NOTE
SUPPLY OPENING
1. REMOVE SCREW NEAREST TO THE
OPENINGANDPULLTHEPANELFIRMLY
TOWARDTHEOUTSIDEOFTHEUNITTO
DISENGAGE THE BACK ATTACHMENT.
RETURN OPENING
2. REMOVE RIGHT HAND SCREW AND
MOVE PANEL TO THE RIGHT OR RE-
MOVE BOTH SCREWS.

Page 7
LOCATIONS AND RECOMMENDATIONS
HORIZONTAL AIRFLOW APPLICATION
1. Theseunitsaredesigncertifiedforoutdoorinstallations. These
units may be installed directly on wood flooring or on Class A,
Class B, or Class C roof covering material. The discharge air
from the condenser fans must be unrestricted for a minimum of
3 feet above the unit.
NOTE: The unit is shipped for horizontal installation.
TheAir Inlet Hood in the combustion blower accesspanelmust
have adequate clearance around the air opening into the
combustion area. See Outline Drawing, Figure 3.
Examine all flue product-carrying areas of the furnace, its vent
system, and the main burner for safe operation. A periodic
inspectionof the furnace should be made by a qualified service
agency at the start of each heating season.
ReplacementpartslistforthisGas/ElectricAirConditioner,maybe
obtained by contacting your local manufacturer representative.
NOTE: If any internal accessories are to be added to the unit,
install them at the shop if at all practical.
2. Location of the unit must allow service clearance around it.
Clearance of the unit must be given careful consideration. See
Figures 2, 3, and 4.
IMPORTANT: Air outlet duct must have 1" clearance to
combustible material downstream from the unit.
3. Check the handling facilities to ensure the safety of personnel
and the unit(s).
4. CAUTION MUST BE TAKEN AT ALL TIMES TO AVOID
PERSONAL INJURIES AND/OR DAMAGE TO EQUIPMENT
5. The unit must be mounted level for proper drainage of water
through the holes in the base pan.
6. The unit must not be exposed to direct roof water runoff.
7. Flexible duct connectors must be of a flame retardant material.
All duct work outside of the structure must be insulated and
weatherproofed in accordance with local codes.
8. Holesthrough exteriorwalls mustbesealed inaccordance with
local codes.
9. All fabricated outdoor ducts should be as short as possible.
CLEARANCES
1. The recommended clearances for single-unit installations are
illustrated in Figure 4. These minimum requirements are not
only an important consideration when determining unit place-
ment, but they are also essential to ensure adequate service-
ability, maximum capacity, and peak operating efficiency.
2. Any reduction of the unit clearances indicated in these illustra-
tionsmay result in condenser coil starvationorthe recirculation
of warm condenser air. Actual clearances which appear to be
inadequate should be reviewed with a local engineer.
3. See the unit’s nameplate for the absolute minimum clearance
between the unit and any combustible surface(s).
IMPORTANT:
1. Removethe FlueandAirInletHoodwithgasket fromthereturn
air section of the unit.
Thescrewsthatattachtheflueandairinlethoodwillbeinstalled
in their proper location at the factory. Therefore, they must be
removedandthenusedtoattachtheflueandtheairinlethood.
2. Remove the packaging material from the components and
secure the Flue and Air Inlet Hood with the gasket to the unit
with sheet metal screws as illustrated in Figure 5. See “Firing
Rate Selection” section for additional information.
NOTE: Outdoor air or other requirements during heating
operation that result in supply air temperatures below 80
degrees F or return air temperatures below 50 degrees F may
cause flue gas condensate to form and is to be avoided.
DOWNFLOW APPLICATION -- CURB MOUNTING
1. The Roof Mounting Curb, (field assembled
BAYCURB030,038,033,034A), or a field fabricated curb must
be in place before the unit is hoisted to the roof top.
2. TheRoofMountingCurb(frame)mustbe installed onaflat,
level section of the roof (maximum of 1/4" per foot pitch)
and provide a level mounting surface for the unit. In
addition,besuretoprovidesufficientheightabovetheroof
to prevent water from entering the unit.
NOTE: This unit was shipped for horizontal installation. Con-
vert to downflow per instructions:
Remove covers from the downflow supply and return air open-
ings and place them over the horizontal supply return air
openings(paintedsideout)andsecurewithsheetmetalscrews.
See Figure 6.
3. Be sure the mounting curb spans structural members (trusses)
ofthe roof, thereby providing sufficient support for theweightof
the unit, the curb, the duct(s), and any factory or field installed
accessories. See Figures 1, 7, 8, 9, 10, and 11.
4. Be sure the hole in the structure for the ducts is large enough
to accommodate the fabricated ducts and the insulation sur-
rounding them. See Figure 4.
Note: If any internal accessories are to be added to the unit,
install them at the shop if at all practical.
5. These units are design certified for outdoor installation. These
units may be installed directly on wood flooring or on Class A,
Class B, or Class C roof covering material. The discharge air
from the condenser fans must be unrestricted for a minimum of
3 feet above the unit.
The air inlet hood in the combustion blower access panel must
haveadequateclearancearoundairopeningsintothecombus-
tion area. See Outline Drawing, Figure 3.
continued on next page

Page 8
LOCATIONS AND RECOMMENDATIONS
15. Access and service clearances for the unit must be given
careful consideration when locating the duct entrance open-
ings. Figure 4 provides unit dimensions.
16. All fabricated outdoor ducts should be as short as possible.
CLEARANCES
1. The recommended clearances for single-unit installations are
illustrated in Figure 4. These minimum requirements are not
only an important consideration when determining unit place-
ment, but they are also essential to ensure adequate service-
ability, maximum capacity, and peak operating efficiency.
2. Any reduction of the unit clearances indicated in these illustra-
tionsmay result in condenser coil starvationorthe recirculation
of warm condenser air. Actual clearances which appear to be
inadequate should be reviewed with a local sales engineer.
IMPORTANT:
1. Remove the Flue and Air Inlet Hood with the gasket from the
return air section of the unit.
Thescrewsthatattachtheflueandairinlethoodwillbeinstalled
in their proper location at the factory. Therefore, they must be
removed and then used to attach the flue and air inlet hood.
2. Remove the packaging material from the components and
secure the Flue and Air Inlet Hood with the gasket to the unit
with sheet metal screws as illustrated in Figure 16 on page 14.
NOTE: Outdoor air or other requirements during heating
operation that result in supply air temperatures below 80
degrees F or return air temperatures below 50 degrees F may
cause flue gas condensate to form and is to be avoided.
INSTALLATION
UNIT SUPPORT
If the unit is to be roof mounted, check the appropriate building
codes for weight distribution requirements. Refer to the applicable
roof curb mounting instruction. Check the unit’s nameplate for
supply voltage required. Determine if adequate electrical power is
available. The furnace may be installed on Class A, B, or C roofing
material.
LOCATION AND CLEARANCES
Installation of the unit should conform to local building codes or, in
the absence of local codes, to the National Fuel Gas Code,
ANSIZ223.1, Latest Revision, and the National Electrical Code.
Canadian installations must conform to CSA and local codes.
Select a location that will permit adequate combustion and ventila-
tion air in accordance with Section 5.3, Air For Combustion and
Ventilation, of the National Fuel Gas Code, ANSIZ223.1, Latest
Revision, or applicable provisions of the local building code.
PLACING AND RIGGING
1. Beforepreparingtheunitforlifting,checktheoutlinedrawingfor
center of gravity for lifting safety. Because of placement of
internalcomponents, the unit’sweightmay be unevenlydistrib-
uted. Approximate unit weights are given in Figure 2, page 3.
NOTE: AccessoryBAYLIFT002AA, a kit offour(4)lifting lugs, is
required for rigging the unit for hoisting. See Figure 7, insert B.
2. Insert the four lifting lugs in the openings provided in the drip lip
ontheperimeteroftheunit. SeeFigure7,insertB. Atapor jerk
to the lug will overcome the interference that arises due to the
nipple on the lug.
3. Before hoisting the unit, be sure that the proper method of
rigging is used, with straps or slings and spreader bars for
protectionduringlifting. Alwaystest-lifttheunittodeterminethe
exact unit balance and stability before hoisting it to the installa-
tion location.
continued from page 7
Examine all flue product-carrying areas of the furnace, its vent
system, and the main burner for safe operation. A periodic
inspection of the furnace should be made at the start of each
heating season.
Replacementpartslistfor thisGas/Electric AirConditioner may
be obtained by contacting your local manufacturer representa-
tive.
6. Location of the unit must allow for service clearance around it.
Clearance of the unit must be given careful consideration. See
Figure 4.
7. IMPORTANT: The air outlet duct must have one (1) inch
clearance to combustible material downstream from the
unit.
8. Exhaust vents or other sources of contaminated air should not
be near the unit’s air inlet, if outside air is to be introduced as
make-up air or a ventilation feature is to be used.
9. Check the handling facilities to ensure the safety of personnel
and the unit(s).
10. Caution must be taken at all times to avoid personal
injuries and/or damage to the equipment.
11. The unit must be mounted level for proper drainage of water
through the holes in the base pan.
12. The unit must not be exposed to direct roof water runoff.
13. Flexible duct connectors must be of a flame retardant material.
All duct work outside of the structure must be insulated and
weatherproofed in accordance with local codes.
14. Roof flashing must be installed to seal the roof curb cavity and
must conform to local building codes.

Page 9
INSTALLATION
IMPORTANT: Do not lift the unit without test lifting for
balanceandrigging. Donotlifttheunitinwindyconditions
or above personnel. Do not lift the unit by attaching a
clevis, hooks, pins, or bolts to the unit casing, casing
hardware, corner lugs, angles, tabs, or flanges. Failure to
observe these warnings may result in equipment damage.
4. When the curb and air ducts have been properly installed, the
unit is ready to be hoisted to the roof and set in position.
IMPORTANT: “Spreader Bars” must be used when hoist-
ing the unit.
5. IMPORTANT: The unit must be lowered into position. The
P.V.C. rubber tape on the curb flange permits the unit to be
repositioned if required without destroying the P.V.C. rub-
ber seals affixed to the mounting curb.
PLACING THE UNIT ON A MOUNTING CURB
1. The unit is designed with a perimeter drip lip that is lower that
the unit base bar, see Figure 7, inset A.
2. Position the unit drip lip down over and in contact with the
outside corner of the curb, as illustrated in Figure 8, insert A.
Continue to lower the unit on top of the curb, with the unit drip
lipastraddle and incontact with boththeend and siderail of the
curb. The unit should now rest on top of the curb.
3. Take the two (2) hold-down brackets shipped with the curb and
secure the unit to the curb with hold-down brackets as illus-
trated in Figure 8, insert A.
➆
➇
SPREADER BARS
OUTDOOR COIL
END OF UNIT
GASKET SEAL
BASE OF UNIT
REST ON TOP OF
CURB RAILS
DRIP LIP
DIMPLE BAYLIFT002A
LIFTING LUGS
SEE DETAIL “A”
“B”
“A”
DRIP LIP ON
PERIMETER OF UNIT
UNIT CORNER
CURB CORNER
EXISTING
SHEET METAL
SCREW
HOLD-DOWN
BRACKET WITH
CURB
FLANGE OF
CURB
“A”
NOTE:
THE INNER PERIMETER OF THE DRIP LIP ON ALL UNITS
SHOULD BE FLUSH WITH THE OUTER PERIMETER OF THE
CURBONTHETWOSIDESSHOWNHERE.SEE FIGURE 2FOR
THE LOCATION OF THE UNIT OVERHANG ON THE
YCZ036-060F MODELS.

Page 10
INSTALLATION
ROOFTOP -- UNITS
For roof top applications using a field fabricated frame and ducts,
use the following procedure:
1. The frame must be located and secured by bolting or welding
to the roof. Flashing is required.
2. The hole in the roof must be prepared in advance of installing
the unit.
3. Secure the ducts to the roof.
TYPICAL ROOFTOP APPLICATION WITH FRAME
(YCZ036,060F MODELS)
➉
TYPICAL ROOFTOP APPLICATION WITH FRAME
(YCZ036,060F)
➈
4. Place the unit on the frame or roof curb. Refer to Figures 9 or
10.
5. Secure the unit to the frame or roof curb.
6. Insulate any ductwork outside of the structure with at least two
(2) inches of insulation and then weatherproof. There must be
a weatherproof seal where the duct enters the structure.
7. Complete the installation according to the instructions in the
following sections of this manual.
ANGLE IRON
FRAME
SUPPLY AIR
ROOF FLASHING
WEATHER-PROOF
DUCT
RETURN AIR
ROOF FLASHING
FLUE
INLET HOOD
ROOF FLASHING
WEATHER-PROOF
DUCT
RETURN AIR SUPPLY AIR
ANGLE IRON
FRAME
FLUE
INLET HOOD

Page 11
INSTALLATION
GROUND LEVEL -- HORIZONTAL UNITS
Forgroundlevelinstallations,theunitshouldbepositionedonapad
thesize of the unitor larger. The unit mustbelevel on the pad. The
padmustnotcomeincontactwiththestructure(SeeFigure11.) Be
sure the outdoor portion of the supply and return air ducts are as
short as possible.
Proceed with the installation as follows:
1. Place the unit on the pad and the five (5) rubber isolators
provided.
CONDENSATE DRAIN PIPING
A3/4-inchfemaleNPT condensate drain connection is provided on
the evaporator access panel end of the unit. See Figure 4. Provide
a trap and fill it with water before starting the unit to avoid air from
being drawn through. Follow local codes and standard piping
practiceswhenrunningthedrainline.Pitchthelinedownwardaway
from the unit. Avoid long horizontal runs. See Figure 12.
NOTE: Do not use reducing fittings in the drain lines. The
condensate drain must be:
●Made of 3/4" pipe size.
●Pitched1/4"perfoottoprovidefreedrainagetoconvenientdrain
system.
●Trapped.
●Must not be connected to closed drain system.
2. Attach the supply and return air ducts to the unit.
3. Insulate any ductwork outside of the structure with at least 2
inchesofinsulationandweatherproof.Theremustbeaweather-
proof seal where the duct enters the structure.
4. Complete the installation according to the instructions in the
following sections of this manual.
3
/ 4 " PVC OR COPPER
TUBING AND FITTINGS
1-1/2" MIN.
TYPICAL GROUND LEVEL APPLICATION
(YCZ036,060F MODELS)
TYPICAL CONDENSATE DRAIN PIPING
SIDING
EXTERIOR
WALL
INSULATE
WEATHERPROOF
OR RAIN SHIELD FLEXIBLE DUCT
CONNECTORS
RETURN AIR
DUCT
SUPPLY AIR
DUCT
OUTDOOR AIR
DISCHARGE
OUTDOOR AIR
INTAKE
SUPPORT PAD
FOUNDATION
FLUE
INLET HOOD
ISOLATORS
(1 PER CORNER
AND 1 UNDER
UNIT CONTROL BOX)
11
12

Page 12
ATTACHING HORIZONTAL DUCTWORK TO UNIT
Allconditionedairductworkshouldbeinsulatedtominimizeheating
and cooling duct losses. Use a minimum of two (2) inches of
insulation with a vapor barrier. The outside ductwork must be
weatherproofed between the unit and the building.
When attaching ductwork to a horizontal unit, provide a flexible
watertightconnection to prevent noisetransmissionfrom the unit to
the ducts. The flexible connection must be indoors and made out
of heavy canvas.
NOTE: Donot draw the canvas taut between the solid ducts.
DUCTWORK
ATTACHING DOWNFLOW DUCTWORKTOROOFCURB
Supply and return air flanges are provided on the roof curb for easy
duct installation. All ductwork must be run and attached to the curb
before the unit is set into place.
Follow these guidelines for ductwork construction:
Connections to the unit should be made with three-inch canvas
connectors to minimize noise and vibration transmission.
Elbows with turning vanes or splitters are recommended to mini-
mize air noise and resistance.
The first elbow in the ductwork leaving the unit should be no closer
than two feet from the unit, to minimize noise and resistance.
DUCT ATTACHMENT METHODS
The following warning complies with State of California law, Proposition 65.
▲ WARNING: This product contains
fiberglass wool insulation! Fiberglass dust and ceramic
fibers are believed by the State of California to cause
cancer through inhalation. Glasswool fibers may also
cause respiratory, skin, or eye irritation.
FIELD DUCT
UNIT DUCT
FLANGE
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
FIELD DUCT
UNIT DUCT FLANGE
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
FIELD DUCT
UNIT DUCT
FLANGE
UNIT BASE
AIR PROOF
THIS SEAM
FIELD DUCT
UNIT DUCT
FLANGE UNIT BASE
AIR PROOF
THIS SEAM
FIELD
DUCT UNIT DUCT FLANGE
UNIT BASE
AIR PROOF
THIS SEAM
FIELD DUCT
UNIT DUCT
FLANGE
UNIT BASE
NOT RECOMMENDED
WATERPROOF SEAM
WITH BUTYL OR
SILICONE
FIELD DUCT
UNIT DUCT
FLANGE
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
HORIZONTAL
DOWNFLOW
13

Page 13
CAUTION:Before making the gas pipe connection give seri-
ous consideration to providing the required clearance neces-
sary to remove the access panels on the unit (e.g., economizer
and filter access panels).
NOTE:
In the absence of local codes, the installation must
conform with American National Standard--Z223.1--National
Fuel Gas Code, Latest Revision.
The available gas supply must agree with the required gas supply
marked on the unit nameplate. Minimum permissible gas supply
pressure for purpose of input adjustment must be at least 7.0 in.
w.c.(incheswatercolumn)fornaturalgasand11in.w.c.forLPgas.
PIPE DELIVERY SCHEDULE
NOTE: The following procedure and tables below apply to
Natural Gas only.
1. Obtain from the gas company the heating value and specific
gravity of the gas delivered.
2. Determine the exact length of pipe needed.
3. Read BTUH input nameplate on the furnace.
4. Use the multiplier opposite the specific gravity of the gas given
in Table 1 below and insert in the following formula:
CFH = Furnace Input in BTUH
Gas Heat Content in BTU/Cu. Ft. X Multiplier
TABLE 1
This will give the factor for columns 2 through 6 in Table 2.
GAS PIPING INSTALLATION
7. Read horizontally to the left of this column for the required pipe
size diameter.
5. Using Table 2, select the pipe length nearest to yours.
TABLE 2
6. Followthis lineverticallydown totheexact CFH foundin Step4
above or the next highest value.
YLNOSAGLARUTAN
SAGFORUOHREPTEEFCIBUCFOELBAT SHTGNELDNASEZISEPIPSUOIRAVROF
EPIP EZIS )hcni(
)teef(EPIPFOHTGNEL
01020304050607
2/1231293736650564
4/387209125103151150169
1025053582542512591081
4/1-10501037095025044004073
SAG.RG.PS6.0DNA.C.WHCNI3.0FOPORDERUSSERPNODESABSIELBATSIHT
NOTE: If this is an LPG application, consult your LPG supplier
for pipe sizes and deliveries.
GAS PRESSURE SET-UP PRECAUTIONS
IMPORTANT: The furnace and its individual shut-off valve
must be disconnected from the gas supply piping system
duringanypressuretesting of thatsystemattest pressures
exceeding 1/2 psig (3.48 kPa).
The furnace must be isolated from the gas supply piping system by
closing its individual manual shut-off valve during any pressure
testing of the gas supply piping system at test pressures less than
or equal to 1/2 psig (3.48 kPa).
GAS SUPPLY LINE PRESSURE
Before connecting the unit to the gas supply line, be sure to
determine the gas pressure in the line.
If the gas supply pressure is excessive (above 14 inches water
column or 1/2 psig), install a pressure regulator either at the supply
source or in the branch circuit serving the unit. Once the regulator
isinstalled,setittoprovideapressureof7incheswatercolumnwith
the unit operating and no greater than 14 inches water column with
the unit not firing.
NOTE: Gas pressure in excess of 14 inches water column
(1/2 psig) may damage the regulator, while improper regulation
may result at pressures lower than 5.5 inches water column at
the unit inlet.
If the supply line pressure is below the minimum supply pressure
indicated on the unit nameplate, contact the gas supply company.
Followthesestepstocompletetheinstallationoftheunitgaspiping.
See Figure 14.
1. Install a tapped, Style A (1/8-inch NPT tap) shut-off gas cock at
the end of the gas supply line near the unit. Be sure the tapped
gas cock is downstream of the pressure regulator, if used.
CIFICEPS YTIVARG REIPITLUM
DESUEBOTSREIPITLUM CIFICEPSEHTNEHW SISAGEHTFOYTIVARG 06.0NAHTREHTO
05.01.1
55.40.1
06.00.1
56.269.
DEALER INSTALLED
GROUND UNION
1/8" N.P.T.PLUGGED
ACCESS FOR TEST
GAUGE CONNECTION
FROM
GAS SUPPLY
DRIP LEG
FIELD SUPPLIED MAIN
GAS VALVE, MUST BE
INSTALLED BY DEALER
OUTSIDE UNIT.
UNIT
TO MAIN
CONTROL
VALVE
6"
MIN
SCHEMATIC DIAGRAM OF
GAS PIPING TO UNIT
▲ WARNING: NEVER USE AN OPEN FLAME
TO TEST FOR GAS LEAKS: AN EXPLOSION COULD
OCCUR, CAUSING INJURY OR DEATH.
14

Page 14
NOTE: The shut-off gas cock must be installed outside of the
unit and should meet the specifications of all applicable national
and local codes .
2. Install a ground union joint downstream of the shut-off cock.
This joint must also be installed outside of the unit.
3. Installa drip leg at least six (6) inches in depth next to the union
as shown in Figure 14. This drip leg is required to collect any
sediment that may be deposited in the line.
4. Before connecting the piping circuit to the unit, bleed the air
from the supply line. Then cap or plug the line and test the
pressure at the tapped shut-off cock. The pressure reading
should not exceed 14 inches water column.
5. Connectthe gas pipingtothe unit. Check thecompletedpiping
for leaks using a soap and water solution or the equivalent.
6. After installation of the gas pipe in the unit, the pipe chase
opening should be closed with the filler/barrier plug provided.
MANIFOLD PRESSURE
Check the manifold pressure at the unit gas valve. Do not exceed
the recommended pressure shown on the unit nameplate.
GAS PIPING INSTALLATION
BURNER & VALVE ILLUSTRATION
FLUE AND HOOD ILLUSTRATION
C664399
MANIFOLD
COVER
2ND STAGE
ADJUSTMENT
3/32" ALLEN
BRACKET-BURNER
HOLD DOWN
BURNER
ORFICE
SCREW
1ST STAGE
ADJUSTMENT
3/32" ALLEN
SCREW
BRACKET
BURNER
SUPPORT
C664400
GAS VALVE
ALTERNATE
MANUAL
"ON/OFF"
SWITCH
15
16

Page 15
INPUT CHECK AND ADJUSTMENT
1. Make sure all gas appliances are off except the furnace.
2. Clock the gas meter with the furnace operating (determine the
dial rating of the meter) for one revolution.
3. Match the “Sec” column in the gas flow (in cfh) Table 3 with the
time clocked.
4. Read the “Flow” column opposite the number of seconds
clocked.
5. Use the following factors if necessary.
For 1 Cu. Ft. Dial Gas Flow CFH =
Chart Flow Reading / 2
For 1/2 Cu Ft. Dial Gas Flow CFH =
Chart Flow Reading / 4
For 5 Cu. Ft. Dial Gas Flow CFH =
10X Chart Flow Reading / 4
6. Multiply the final figure by the heating value of the gas obtained
from the utility company and compare to the nameplate rating.
This must not exceed the nameplate rating.
7. Changes can be made by adjusting the manifold pressure.
a. Attach a manifold pressure gauge.
b. Remove the slot screw on top of the gas valve for 1st stage
manifold pressure adjustment. Remove slot screw on outlet
side for 2nd stage adjustment (See Figure 17).
c. Turn the adjustment nut in to increase the gas flow rate, and
out to decrease the gas flow rate using a 3/32" hex wrench.
Note:
If Model YCZ036F1,3M is installed in a region where NOX must be
below 40 nanograms per input to 72,000 BTUH.
GAS PIPING INSTALLATION
RUOHREPTEEFCIBUCNIWOLFSAG LAIDTOOFCIBUC2
.ceSwolF.ceSwolF.ceSwolF.ceSwolF
800992842054412888
900803042151414868
0102713232258316848
1155623522356318828
2100633812453310908
3155543212551312987
4141553602659214967
5108463002756216957
6105473591854218937
71424839819522100127
81004935810602140196
91973040812661180176
02063146714621121146
12343242716690161126
22723347618660102106
32313444610730142185
42003540612700182165
5288264751477923145
6277274351675963135
7276284051872904115
8275294741080944105
TABLE 3
1st Stage (Lo)
Manifold
Pressure
Adjustment
2nd Stage (Hi)
Manifold
Pressure
Adjustment
HIGH ALTITUDE INSTALLATION
Unitnameplateratingsarebasedonequipmentoperationfromsea
level to 2000 feet elevation above sea level. If the unit installation
is from 2000 - 4500 feet elevation, it will be necessary to change
theburnerorificestothenotedsizes,(ref.NationalFuelGasCode,
sec 8.1.2, Appendix F, Table F4).
SAG EPYT SSERP.NAM ).C.W.ni( EZISECIFIRO tf0002-0 EZISECIFIRO tf0054-0002
LARUTAN3.3
24
*
34
ENAPORP0.014555
* DEPPIHSYROTCAF
Switch Toggles
"ON" or "OFF"
17

Page 16
ELECTRICAL CONNECTIONS
Electricalwiringandgroundingmustbeinstalledinaccordancewith
local codes or, in the absence of local codes, with the National
Electrical Code ANSI/NFPA 70, Latest Revision.
ELECTRICAL POWER
It is important that proper electrical power be available for the unit.
Voltagevariationshouldremainwithinthelimitsstampedontheunit
nameplate.
DISCONNECT SWITCH
Provide an approved weatherproof disconnect either on the side of
the unit or within close proximity and within sight of the unit.
OVER CURRENT PROTECTION
The branch circuit feeding the unit must be protected as shown on
the unit rating plate.
POWER WIRING
The power supply lines must be run in weathertight conduit to the
disconnectandintothebottomoftheunitcontrolbox. Providestrain
relief for all conduit with suitable connectors.
Provide flexible conduit supports whenever vibration transmission
may cause a noise problem within the building structure.
Be sure all connections are made tight. See Figure 18.
NOTES: For branch circuit wiring (main power supply to unit
disconnect),wiresizeforthelengthofrunshouldbedetermined
using the circuit ampacity found on the unit nameplate and the
N.E.C.
For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor.
GROUNDING: THEUNITMUSTBEELECTRICALLYGROUNDED
IN ACCORDANCE WITH LOCAL CODES OR THE NATIONAL
ELECTRIC CODE.
ELECTRICAL WIRING
FILTER INSTALLATION
AIR FILTERS
Filters are to be used with the YCZ036,060F heating/cooling units.
The basic unit does not have filters in it. However, a filter frame
accessory is offered that will allow filters to be installed within the
unit.
Otherwise a filter rack must be installed by the installer in the duct
work.
Affix the filter label supplied with the unit adjacent to the filter area.
TABLE 4
THERMOSTAT HEAT ANTICIPATOR
Thethermostat heat anticipators should be set to .4 amps on single
or two stage thermostats.
IMPORTANT: Upon completion of wiring check all electrical
connections, including factory wiring within the unit, make
sureall connections are tight. Replaceand secure all electricalbox
covers and access doors before leaving the unit or turning on the
power to the unit.
NOTE: Unit must be grounded for ignitor to operate prop-
erly. Gas pipe to unit is not an adequate ground. Ground
the unit internally as provided. See wiring diagram for
location.
CONTROL WIRING (CLASS II)
Low voltage control wiring should not be run in conduit with power
wiring unless Class 1 wire of proper voltage rating is used. Route
the thermostat cable or equivalent single leads of No. 18 AWG
colored wire from the thermostat subbase terminals through the
rubber gromment on the unit. See Figures 3 and 4 for the control
entry location. Make connections as shown on the unit wiring
diagram and in Figure 18.
Do not short thermostat wires since this will damage the control
transformer.
Recommendedwiresizes andlengthsforinstallingthe unitthermo-
stat are provided in Table 5. The total resistance of these low
voltage wires must not exceed one (1) ohm. Any resistance in
excess of 1 ohm may cause the control to malfunction because of
the excessive voltage drop.
EZISERIW)tF(HGTNELMUMIXAM
8157
61521
41002
TABLE 5
THERMOSTAT WIRE SIZE AND MAXIMUM LENGTH
TINU LANIMON MFC *RETLIF EZIS-.tF.qS RETLIF ECNATSISER
F630ZCY00214 50.0
F060ZCY000276.650.0
*Filters must be installed in the return air system. The above square
footagesarebasedon300F.P.M.facevelocity. If permanent filters are
used,size permfg. recommendation with clear resistance of 0.05"WC.

Page 17
YCZ-F FIELD WIRING DIAGRAM
the Thermostat System Switch until power has been applied long
enough to evaporate any liquid R-22 in the compressor. It is
recommendedthatthesumpheaterbeenergizedforeight(8)hours
prior to starting.
After all electrical wiring is complete, set the thermostat system
switch in the OFF position so that the compressor will not run
and then apply power by closing the system main disconnect
switch.Thiswillactivatethecompressorsumpheat. Donotchange
ELECTRICAL WIRING
18

Page 18
START - UP
PRE-START QUICK CHECKLIST
●Is the unit properly located and level with the proper clearance?
See Figure 4.
●Is the duct work correctly sized, run, taped, insulated, and
weatherproofed with proper unit arrangement? See Ductwork
Installation section.
●Isthe gas piping correctly sized, run,trapped,and purged of air?
See Gas Piping section.
●Isthe condensate lineproperly sized, run,trapped,and pitched?
●Isthefilterofthecorrectsizeandnumber? Isitcleanandinplace?
●Is the wiring properly sized and run according to the unit wiring
diagram?
●Are all the wiring connections, including those in the unit, tight?
●Has the unit been properly grounded and fused with the recom-
mended fuse size? See Wiring Data.
●Is the thermostat level, correctly wired, well located, and set for
the proper heat anticipation?
●Have the air conditioning systems been checked at the service
ports for charge and leak tested if necessary?
●Does the condenser fan and indoor blower turn free without
rubbing, and are they tight on the shafts?
●Has the indoor blower speed been determined and the proper
speed been set? See the Unit Wiring Diagram.
●Has all work been done in accordance with applicable local and
national codes?
●Are all covers and access panels in place to prevent air loss and
safety hazards?
STARTING THE UNIT IN THE COOLING MODE
CAUTION: Before starting the system on the cooling cycle, turn the
thermostat switch to OFF and close the unit disconnect switch. This
procedure energizes the compressor crankcase heater, vaporizing
any liquid refrigerant in the crankcase. This is a precaution against
foaming at startup which could damage the compressor bearings.
Allow the heater to operate a minimum of eight (8) hours.
NOTE: See the section on “Sequence of Operation” for a
description of the cooling operating sequence.
To start the unit in the cooling mode, set the thermostat system
switch to COOL and move the thermostat COOL indicator to a
setting below room temperature. The condenser (outdoor) fan
motor compressor and evaporator (indoor) fan motor will operate
automatically.
OPERATING PRESSURES
After the unit has operated in the cooling mode for a short period of
time, install pressure gauges on the gauge ports of the discharge
andsuctionlinevalves. Checkthesuctionanddischargepressures
and compare them to the normal operating pressures provided in
the unit’s SERVICE FACTS.
NOTE: Donotusethepressuresfromtheunit'sSERVICEFACTS
to determine the unit refrigerant charge. The correct charge is
shown on the unit nameplate. To charge the system accurately,
weigh in the charge according to the unit nameplate.
VOLTAGE
With the compressor operating, check the line voltage at the unit.
The voltage should be within the range shown on the unit name-
plate. Iflowvoltageisencountered,checkthesizeandlengthofthe
supply line from the main disconnect to the unit. The line may be
undersized for the length of the run.
COOLING SHUT DOWN
Placethe systemselector intheOFF positionor reset thermostatat
a setting above room temperature.
Do not de-energize the main power disconnect except when unit is
to be serviced. Power is required to keep the heat pump compres-
sor warm and boil off refrigerant in the compressor.
HEATING CYCLE
NOTE: See Sequence of Heating Operation.
These units are equipped with a solid-state ignition control that
lights the burners each time the thermostat calls for heat. The
burners are extinguished during the OFF cycle.
Thegasheatingsectionoftheunitcanbestartedusingthefollowing
procedure:
1. Be sure the thermostat is at its lowest setting and the power to
the unit is off.
a. Turn the main shutoff valve on the gas supply line ON.
b. Turn or switch the manual valve on the combination gas
valve ON position.
2. Be sure the burner compartment access panel is in place.
a. Turn on the electrical power to the unit.
b. Turn the thermostat to the highest setting in the heating
cycle.
3. As the thermostat calls for heat, the system cycles as follows:
a. The combustion blower is energized.
b. The pressure switch is closed.
c. The gas valve opens and the ignitor lights the burner.
d. Cycle the thermostat on and off a few times to check out the
control system and burner operation characteristics.
4. With the burners operating, check the manifold pressure with a
manometer. Do not exceed recommended pressures.
5. Adjust the unit to obtain an air temperature rise with that
specified on the unit nameplate.
6.
NOTE: For manifold pressures and orifice sizes for gas with
other BTU ratings, contact the local gas utility. Manifold
pressureshouldbe3.3incheswatercolumn (+0.1). Inputmust
not exceed the value shown on the rating plate.
7. Settheheatanticipatorofthethermostattoequaltheamperage
draw of the gas valve, approximately 0.7.

Page 19
START - UP
8. Set the thermostat at the desired temperature setting and the
unit will function automatically.
STARTING THE UNIT IN THE GAS HEATING MODE
1. Checktomakesureallgrillesandregistersareopenandallunit
access doors are closed before start-up.
2. Purge the gas supply line of air by opening the union ahead of
the unit. When the odor of gas is detected, retighten the union
and wait five (5) minutes before proceeding.
3. Set the wall thermostat to its lowest position and place the fan
switch in the AUTO or ON position.
4. Open the main gas valve(s) and turn on the unit power supply.
5. Reset the heating temperature lever on the room thermostat at
the highest value above room temperature. The combustion
blower motor should energize. The main burners should light
within 20-25 seconds. Initial start may be delayed somewhat if
the unit has not been purged and air is trapped in the gas line.
NOTE: Bluesmokeproducedbytheheatexchangerduringthe
initial burner firing is caused by a thin film of oil on the surface
of the heat exchanger. This oil will burn off quickly.
6. Cycle the thermostat OFF and ON a few times at a rate of not
more than once every thirty (30) seconds. Check both the
control operation and the burner operating conditions.
MANIFOLD PRESSURE
1. Connect a manometer to the pressure tap at the outlet side of
the unit’s gas valve. Read the manifold pressure with the main
burners firing.
2. If the manifold pressure reading does not match the value
indicated on the unit nameplate, the unit pressure regulator
must be adjusted as follows:
a. Removethe cover screw on the gas regulator locatedonthe
front side of the unit’s gas valve.
b. Turn the adjusting screw clockwise to increase manifold
pressure or counterclockwise to decrease manifold pres-
sure.
3. Check the temperature rise during furnace operation to insure
that it falls within the range specified on the unit nameplate.
4. If the temperature rise noted is outside of the specified limits,
adjust the indoor air flow to cause the temperature rise of the
heat exchanger to fall within the required range.
Operation of the unit heating or cooling cycles is controlled by the
setting of the system switch on the room thermostat. Once the
system switch is placed either in the “HEAT” or “COOL” position,
unit operation is automatic. A fan switch on the thermostat also
provides for it continuous operation of the evaporator fan when
desired. The fan switch “ON” position provides continuous opera-
tion while the “AUTO” position provides operation during the heat-
ing or cooling cycles.
HEATING CYCLE
Thermostat call for heat ( 2-stage thermostat)
Call for 1st stage only:
(R) and (W1) thermostat contacts close signaling the control mod-
ule (IGN) to run its self-check routine. After the control has verified
that the pressure switch (PS) contacts are open, the limit switch
(TCO) contacts are closed, and the flame rollout (FL) switch is
closed, the induced draft blower (CBM) will be energized on high
speed for approximately 5 seconds.
After the induced draft blower (CBM) has come up to speed, the
control will verify that the pressure switch (PS) contacts are closed
and switch the induced draft blower to low speed for 10 second
prepurge. The gas valve (GV) is energized in the first stage to
permit gas flow and the spark ignitor (IP) is energized. The flame
detector (FD) confirms that ignition has been achieved within the 7
second trial period.
As the flame detector confirms that ignition has been achieved the
delay to indoor fan on period begins timing and after approximately
45 seconds, the indoor blower motor (IDM) will be energized at low
speed and will continue to run during the heating cycle.
Call for 2nd stage after 1st stage:
(R) and (W2) thermostat contacts close signaling a call for second
stage heat. The induced draft motor (CBM) is energized on high
speed and the gas valve on second stage. After approximately 30
seconds the control energizes the indoor blower on high speed.
2nd stage satisfied, 1st stage still called:
(R) and (W2) opens, the induced draft blower is reduced to low
speed the gas valve is reduced to first stage. After aprox. 30
seconds the indoor blower motor is reduced to low speed.
1st stage satisfied:
(R)and(W1)opens,thegasvalve(GV)willclose.Theinduceddraft
blower (CBM) will be de-energized after approximately 5 seconds
postpurge.Theindoorblowermotor(IDM)willcontinuetorunforthe
fanoffperiod(fieldselectable60or90seconds[bydipswitch]),then
will be de-energized by the control module.
Thermostat satisfied:
(R) and (W1/W2) (jumpered) contacts open signaling the control
module to close the gas valve and de-energize the induced draft
blower after approximately 5 second postpurge. The I.D. blower
motor will continue to operate at the current speed for 60 or 90
seconds after the flames are extinguished .
SAFETY SEQUENCES
This product is equipped with safety devices to protect against
abnormal conditions.
The temperature limit switch (TCO) is located in the gas com-
partment on the vestibule panel above the burner assembly. This
automatic reset device protects against excessive leaving air
temperature. If this device opens, the gas valve is immediately
closed and will not permit operation until the limit switch closes.
SEQUENCE OF OPERATION

Page 20
DIP SWITCHES (TYPICAL SETTINGS)
The rollout switch (FS) is located in the gas compartment near the
inlet of the burners. This is a single use device designed to protect
against any form of flame rollout. If this device is opened the gas
valveisimmediately de-energizedandthecontrol(IGN) willlockout
the system. The rollout switch (FS) must be replaced before
operation is allowed to continue.
Thepressureswitch(PS)islocatedintheupperrightsideofthegas
compartment. This automatic device assures adequate combus-
tion air pressure. If pressure against the induced draft blower outlet
becomes excessive, the pressure switch will react and shut off the
gas valve, until acceptable combustion pressure is again available.
If the control (IGN) does not sense flame within the first trial for
ignition period. The gas valve will be de-energized. The control
(IGN) will initiate a 60 second interpurge. Following the interpurge,
on the second trial the gas valve will be energized on second stage
(high heat input). If the flame is sensed within 10 seconds after the
second try and only a call for first stage exists, the gas valve will be
reducedto firststage. Ifthe secondtryisnotsuccessful, thecontrol
will start another 60 second interpurge. After the interpurge, a third
attempt will be tried. The gas valve will be energized on second
stage (high heat input). If the flame is sensed within 10 seconds
after the third try and only a call for first stage exists, the gas valve
will be reduced to first stage. If the third try is not successful. The
control will lock out.
If loss of flame occurs during a heating cycle, the control (IGN) will
close the gas valve. The control will than recycle the ignition
sequence,thenifignitionisnotachieved,itwillshutoffthegasvalve
and lock out the system.
If control lock out occurs, the control (IGN) will retry a complete
ignition sequence in 2 hours
The control (IGN) can be reset by removing power to the unit or by
turning the thermostat from “on” to “off" for approximately three
seconds, then back “on.”
COOLING CYCLE
Thermostat call for cool ( 2-stage thermostat)
Call for 1st stage only:
Withthe roomthermostat system switchin the “COOLING”position
and the fan switch in the “AUTO” position, the Y1 thermostat
contacts closes to the control board,
(the board will wait 3 seconds
tocheckiftheY2mayalsobecalling)
theboardwillenergize (CC1)
and the outdoor fan relay for low speed and the G thermostat
contact to G-IGN and to G1 on the ICMC is energized. (The status
light is flashing and the Y1 light is on.)
Theenergizedcompressorcontactor(CC1)completesthecircuitto
the compressor (CPR1), If the compressor safety controls are
closed, the compressor (CPR1) will operate with the outdoor fan
motor(ODM) on low speed. The (ICM)indoor fan motor will operate
onlow speed. The thermostat will continue to cyclethecompressor
and fans to maintain the desired temperature.
Withthethermostatfanswitchinthe“ON”position,theGthermostat
contact is closed to G1 on the ICMC board and the the (ICM)indoor
fan motor will continue to run on low speed regardless of compres-
sor and condenser fan operation.
Call for 2nd stage after 1st stage:
The Y2 thermostat contact closes to the control board. for 1 minute
both compressors are off, (all lights are flashing for 1 minute), than
the board will energize the (CC2) compressor contactor,and the
outdoor fan relay for high speed and the indoor fan high to the Y on
the ICMC board is energized for indoor high speed fan operation.
(The status light is flashing and the Y1 and Y2 lights are on.)
2nd stage satisfied, 1st stage still called:
The Y2 thermostat contact opens to the control board. for 1 minute
both compressors are off,
(the status and Y1 light are flashing for 1
minute),
than the board will energize (CC1) low compressor
contactor,andthe outdoor fanrelayfor low speedandindoor fan for
low speed. (The status light is flashing and the Y1 light is on.)
ICM FAN MOTOR ADJUSTMENTS
If the airflow needs to be increased or decreased, see the Indoor
Blower Performance Table below. Information on changing the dip
switch settings for speed control of the blower motor is in this table.
BlowerspeedchangesaremadeontheICMCFanControlmounted
in the control box. The ICMC Fan Control controls the variable
speed motor.
Thereisa bankof 8dipswitches,(SeeFigure below),located atthe
lowerrightsideoftheboard.Thedipswitchesworkinpairstoselect
the cooling/heat airflow (CFM/TON), and Fan off-delay options.
INDOOR BLOWER TIMING
The ICMC Fan Control controls the variable speed indoor blower.
The FAN-OFF period is set on the ICMC Fan Control board by dip
switches#5 and #6. Thedelaysettings of the blower areasfollows:
SEQUENCE OF OPERATION
JUMPER
BK
CFM SELECTION
LIGHT (GREEN)
DIP
SWITCHES
FOR HUMIDISTAT
ICM FAN CONTROL
19