Magic-Pak HWC8-12 User manual

Page 1 of 18507388-01 Issue 1504
Improper installation, adjustment, alteration, service or maintenance can cause property damage,
personal injury or loss of life. Installation and service must be performed by a licensed professional
installer (or equivalent), service agency or the gas supplier.
WARNING
If these instructions are not followed exactly, a fire or
explosion may result causing property damage, personal
injury, or loss of life.
CAUTION
These units are not approved for mobile home applicaons.
Such use could result in property damage, personal injury,
or death.
WARNING
Do not store combusble materials near the furnace or
warm air ducts. The material may ignite by spontaneous
combuson creang a re hazard.
WARNING
For your safety, do not store or use gasoline or other
ammable vapors and liquids in the vicinity of this or any
other appliance. Such actions could result in property
damage, personal injury, or death.
WARNING
Installaon shall be made in accordance with the requirements of the local ulity and other authories having jurisdicon, or with
the Naonal Fuel Gas Code, ANSI Z223.1 (latest edion) and the Naonal Electrical Code in the United States or CAN/CGA-B149.1 &
.2 and the Canadian Electrical Code CSA C22.1 Part 1 (latest edion) in Canada. Any alteraon of internal wiring will void cercaon
and warranes.
CAUTION
Save these instrucons for future reference
HWC8 V-SeriesTM Models
INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
INSTALLATION.................................................................2
START-UP ........................................................................9
OPERATION...................................................................10
MAINTENANCE .............................................................10
WIRING DIAGRAMS ......................................................16
Manufactured By
Allied Air Enterprises LLC
A Lennox International Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
*P507388-01*
*P507388-01*

Page 2 of 18 507388-01Issue 1504
clearances to combusble material held to 0” sides, 2” top, and
1” front and plenum. Adequate clearance must be provided to
install the union and manual shuto valve as well as providing
accessibility for eld wiring. Do not install directly on carpeng,
le, or other combusble material other than wood ooring.
The grille side of the unit may be ush with, or extend beyond, the
face of the exterior wall, but should not be recessed more than
2” from the face of the building and should not be obstructed
with trees, landscape materials, or building structure.
There is no minimum clearance required on locang the unit to
an interior corner of a building.
If the unit is to be enclosed, provisions should be made allowing
access to the indoor side of the unit for changing lters and for
inspecon. At least 29” of unobstructed space should be provided
in front of the indoor side, whether enclosed or not, to permit
removal of the cooling chassis should repairs or inspecon be
required.
If the unit is installed in a residenal garage, it must be located
or protected to avoid physical damage by vehicles. Unit must be
installed so the burners and ignion source are not less than 18”
(457 mm) above the oor. This unit must be installed so that no
electrical components are exposed to water.
This appliance should be installed in a locaon such that the vent
outlet is located in the following manner:
1. Distances to windows that open, building openings, or public
walkways should be consistent with the Naonal Fuel Gas
Code Z223.1 or CAN/CGA-B149.1 & .2.
2. For U.S. installaons, the vent system shall terminate a
minimum horizontal clearance of 4’ from electric meters,
regulators, and relief equipment. For installaons in Canada,
refer to the current CAN/CGA-B149.1 & .2 or with the
authories having local jurisdicon.
3. Flue products will not cause degradation to building
materials.
This furnace design is not listed for installation in mobile
homes, recreational vehicles, or outdoors.
Use of Furnace as a Construction Heater
Allied Air does not recommended the use of these units as a
construction heater during any phase of construction. Very
low return air temperature, harmful vapors and operation of
the unit with clogged or misplaced lters will damage the unit.
Units may be used for heating of buildings or structures
under construction, if the following conditions are met:
•The Unit must be permanently installed per these
installation instructions.
•A room thermostat must control the furnace. The use
of xed jumpers that will provide continuous heating is
not allowed.
INSTALLATION
General
These instrucons must be hung on or near the furnace in a
conspicuous place.
The HWC8 V-Series™ units are self-contained, gas-red heang
with electric cooling models. The unit design has been cered by
Intertek Tesng Services for compliance with the latest edion of
the American Naonal Standard – ANSI Z21.47/Naonal Standard
of Canada – CAN/CGA-2.3 for direct vent central furnaces. The
HWC8 models are cered to be in compliance with the latest
edion of A.H.R.I. Standard 390. All models are design cered
for heang operaon when red with natural or propane gas.
These installaon instrucons are intended as a general guide
only, for use by an experienced, qualied contractor.
Inspection
The unit is shipped in one package, completely assembled and
wired. The Evaporator drain tubing is in the cooling compartment
behind the lter access panel.
If any damage is found, proper notaon should be made on the
carrier’s freight bill. Damage claims should be led with the
carrier as quickly as possible.
Check the rang plate to conrm heang and cooling capacies.
The unit should be operated only with the type of gas and
electrical supply noted on the rang plate.
IMPORTANT: Remove the chassis hold down shipping bracket
before installaon. These brackets are located on the outdoor
side of the unit below the louver panels.
Location
The design is cered for indoor installaon only. The interior
portions of the unit may be surrounded by a closet with
In the State of Massachuses:
This product must be installed by a licensed Plumber or Gas
Fier. When exible connectors are used, the maximum
length shall not exceed 36”. When lever-type gas shutos
are used, they shall be T-handle type.
WARNING
Install operate and maintain unit in accordance with
manufacturer’s instrucons. The State of California has
determined that this product may contain or produce
chemicals, in very low doses, which may cause serious
illness or death. it may also cause cancer, birth defects or
reproducve harm.
WARNING

Page 3 of 18507388-01 Issue 1504
The sleeve is not intended as the sole support for the unit.
An addional support must be provided near the return
opening on the unit for adequate support. The use of
vibraon isolaon material between the unit and the support
is recommended.
CAUTION
•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.
• Air lters must be installed in the system and must be
maintained during construction.
•Air filters must be replaced upon construction
completion.
•The input rate and temperature rise must be set per the
furnace rating plate.
•One hundred percent (100%) outdoor air must be
provided for combustion air requirements during
construction.
• The furnace heat exchanger, components, duct system,
air lters and evaporator coils must be thoroughly
cleaned following nal construction clean-up.
•All furnace operating conditions (including ignition, input
rate, temperature rise and venting) must be veried
according to these installation instructions.
Installing With a Wall Sleeve
Refer to the installaon instrucons packed with the wall sleeve
and Figure 1 for guidance in assembly and mounng using a
wall sleeve.
Make sure the gaskets aached to the sleeve are not damaged.

Page 4 of 18 507388-01Issue 1504
Figure 1
HWC Installaon
Plywood
28" Min.
Wall Sleeve
Vibration Isolating Material
FLO
O
R
6 x 22 Minimum Opening
to Align with Return Air
Opening in Unit.
""
Figure 2
HWC Evaporator Condensate Drain Installaon
Drain Pan
Open Drain Trap
Return
Air Duct
To Open
Drain Trap
Alternative
Method
5/8
" I . D.
Plastic Tube
(Supplied)
Top of Drain Tube
Must be Below
Bottom of Drain Pan
Drain Tube - Pitch 1"
for every 10 ft.
(Field Supplied)
Evaporator Condensate Drain
Install the plasc drain tube (furnished) over the 5/8” O.D. ng
in the center of the Evaporator condensate pan. Connect other
end of the drain tube to the open trap (see Figure 2). The plasc
drain connecon is provided so that it may be disconnected from
the permanent drain tubing in the building in the event it becomes
necessary to remove the cooling chassis assembly.
The drain line should pitch gradually downward at least 1” per
10’ of horizontal run to the open drain trap.
Be certain that the plasc drain tube has free drainage and is not
crimped or aened at any bend.
Seal the space between the wall sleeve and the building opening
with non-hardening caulking compound. The seal must be
weatherght to prevent entrance of moisture and water into
the building.
Assure that the unit is completely seated against the gaskets on
the wall sleeve.
Installing Without a Wall Sleeve
Refer to the following direcons and Figure 1 for guidance in
installing the unit without a wall sleeve:
1. Measure the size of the unit and provide an opening in an
outside wall that will accept the unit. Local ordinances may
require a steel lintel to support the wall above the opening.
The opening must be square in all four corners.
2. Posion the unit so that the grilles on the outside face of the
unit are ush or extend beyond the face of the exterior wall,
but not recessed more than 2” from the face of the building.
Provide a support under the unit, inside the building. Make
sure that the inside support does not block the return air.
The unit should be installed level or pitched slightly to the
outside of the building so that rain water will drain away.
3. Seal the space between the unit and building opening using
a non-hardening caulking compound. The seal must be
weatherght to prevent entrance of moisture and water into
the building. Make sure the drain holes in the base are not
plugged with caulking.
COMBUSTION AIR
This unit is a direct - vent furnace which obtains all air needed
for combuson from outdoors.

Page 5 of 18507388-01 Issue 1504
Turn on exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not
operate a summer exhaust fan. Close replace dampers.
4. Following the lighng instrucons, place the unit being
inspected in operation. Adjust the thermostat so the
appliance will operate connuously.
5. Test for spillage at the dra control relief opening aer 5
minutes of main burner operaon. Use the ame of a match
or candle.
6. Follow the preceding steps for each appliance connected to
the common venng system.
7. Aer it has been determined that each appliance remaining
connected to the common venng system properly vents
when tested as outlined above, return doors, windows,
exhaust fans, replace dampers, and any other fuel burning
appliance to their previous condion of use.
8. If improper venng is observed during any of the above tests,
the common venng system must be corrected. See Naonal
Fuel Gas Code, ANSI Z223.1 (latest edion) or CAN/CGA
B149.1 & .2 Canadian Installaon Codes to correct improper
operaon of common venng system.
Gas Connecons
The gas line to the unit should be adequately sized to prevent
undue pressure drop and should never be smaller than the
manual valve used. Consult the local ulity or Naonal Fuel Gas
Code for complete details on special requirements in sizing gas
piping.
The units supplied for operaon with natural gas contain a
gas regulator which must be operated with inlet gas pressures
specied on the rang plate. If gas line pressure exceeds this
gure, an addional high pressure regulator must be installed
to reduce this pressure.
Units for operation with propane must be converted with a
kit supplied by the manufacturer and require for operaon an
inlet pressure of 11” W.C. minimum and 13” W.C. maximum. A
regulator is also required on the propane tank.
If local codes allow use of a exible gas connector, a new listed
connector must be used. Do not use a connector which has
previously serviced another gas appliance.
Venting
The venng system is an integral part of the appliance. The
venng system must not be modied or added on to.
The unit contains a combuson inducer. The inducer draws
the combuson products out of the heat exchanger together
with diluon air and forces the mixture from the unit to the
outside. No special provisions are required for supplying air for
combuson, nor is a chimney required.
The vent outlet must not be altered or extended.
The venng system is designed for proper operaon under all
weather condions and for winds up to 31 m.p.h.
Removal of Unit from Common Venng System
When an exisng furnace is removed from a common venng
system serving other appliances, the venng system is likely to be
too large to properly vent the remaining aached appliances. The
following test should be conducted with each appliance while
the other appliances connected to the common venng system
are not in operaon.
1. Seal any unused openings in the common venng system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restricon, leakage, corrosion, or other deciencies which
could cause an unsafe condion.
3. Insofar as is praccal, close all building doors and windows
between the space in which the appliances remaining
connected to the common venng system are located and
other spaces in the building. Turn on clothes dryers and any
appliance not connected to the common venng system.
Insufficient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rusting
and premature heat exchanger failure. Excessive
exposure to contaminated combustion air will result
in safety and performance related problems. Avoid
exposure to the following substances in the combustion
air supply:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine base swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon tetrachloride
Halogen type refrigerants
Cleaning solvents (such as perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric acid
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
WARNING
If a exible gas connector is required or allowed by the
authority that has jurisdiction, black iron pipe shall be
installed at the gas valve and extend outside the furnace
cabinet. The exible connector can then be added
between the black iron pipe and the gas supply line.
CAUTION

Page 6 of 18 507388-01Issue 1504
A manual shuto valve must be located outside the unit. The use
of a union located upstream of the controls is recommended,
between the controls, and the manual shuto valve. This will
facilitate removal of controls and manifold. See Figure 3 for
recommended placement of the union.
Provide a drip leg in the supply piping located exterior to the
unit. Piping must be ght and non-hardening. Pipe compound
resistant to propane must be used.
Electrical Connecons
All wiring must be done in accordance with the National
Electrical Code, ANSI/NFPA No. 70 (latest edion); Canadian
Electrical Code Part 1, CSA C22.1 (latest edion); or local codes,
where they prevail. Any alteraon of internal wiring will void
cercaon and warranty.
The rang plate indicates the operang voltage, phase, minimum
circuit ampacity, maximum fuse size, and minimum voltage. Units
must never be installed where voltage exceeds 10% over the
voltage indicated on the rang plate.
Units are factory wired for a 230 volt power supply. If power
supply is 208 volts, it will be necessary to change a wire
connecon on unit transformer from 240 volt terminal to 208
volt terminal as shown on the wiring diagram.
Failure of the compressor as a result of operaon on improper
voltage voids the compressor replacement warranty.
A separate electric line with wire having a temperature rang of
60°C should be run directly from the main supply panel to the
leads in the unit. Refer to the rang plate located on the unit
for proper fuse or breaker size. Make sure the unit is electrically
grounded in accordance with local codes or, in the absence of local
codes, with the Naonal Electrical Code, ANSI/NFPA No. 70 (latest
The furnace must be isolated from the gas supply piping
system by closing the individual manual shutoff valve
during any pressure tesng of gas supply piping system at
test pressures equal to or less than 1/2 psig or 14” W.C. If
the piping system is to be tested at pressures in excess of
1/2 psig, the furnace and its individual shuto valve must
be disconnected from the gas supply piping system. The
gas valve supplied with this furnace is rated at 1/2 psig.
Any higher pressure may rupture the pressure regulator
diaphragm which will cause overring of the burners and
improper burner operaon. This acon may produce a
high concentraon of carbon monoxide which can result
in asphyxiaon.
WARNING
Figure 3
Gas Supply Piping
Leak Check
After gas piping is completed, carefully check all piping
connecons (factory and eld installed) for gas leaks. Use a leak
detecng soluon or other preferred means.
NOTE: If emergency shutoff is necessary, shut off the main
manual gas valve and disconnect the main power to the
furnace. The installer should properly label these devices.
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly after
leak test has been completed. Do not use matches,
candles, ame or other sources of ignition to check for
gas leaks.
CAUTION
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and service
to protect the furnace’s electronic controls. Precautions
will help to avoid control exposure to electrostatic
discharge by putting the furnace, the control and
the technician at the same electrostatic potential.
Neutralize electrostatic charge by touching hand and
all tools on an unpainted unit surface, such as the gas
valve or blower deck, before performing any service
procedure.
CAUTION
Compounds used on threaded joints of gas piping must
be resistant to the actions of liquied petroleum gases.
IMPORTANT
Never use a ame to check for gas leaks. Explosion causing
injury or death may occur.
CAUTION

Page 7 of 18507388-01 Issue 1504
edion) for installaons in the U.S. or the Canadian Electrical
Code Part 1, CSA C22.1 (latest edion) for installaons in Canada.
See rang plate for correct wire ampacity for the cooling chassis
required, and size wire accordingly.
Thermostat
Install the thermostat according to the direcons furnished with
it. The thermostat must be located on an inside wall where it will
not be aected by dras, sunlight, or any other heat producing
appliances. Connect the thermostat wires to the low voltage
leads on top of the unit following the wiring diagram aached
to the unit. The heat ancipator seng is 0.50 amp.
Air Filter
All indoor return air must be ltered. A permanent-type lter is
furnished with the unit, located directly behind the access panel.
Removing the panel permits access to the lter. See Figure 3.
If an installaon is made in which it is more desirable to mount the
lter exterior to the unit, in the return duct work or elsewhere, the
permanent lter can be used or replaced with a disposable lter.
If a disposable lter is used, refer to the informaon provided in
Table 1 when sizing the disposable lter.
Supply and Return Duct(s)
Provide duct(s) sized suciently to handle the larger of the air
volumes for heang or cooling provided by this model.
Connect the supply duct to the top of the unit using canvas
connections or other flexible connections to prevent noise
transmission into the duct system.
To connect the return duct to the system, use a straight piece
of duct 22” wide by 6” deep. Insert the duct into the return
opening in the boom of the unit and ange the duct over the
exisng anges around the opening inside the unit. Make sure
that all sides of the duct are anged over to permit removal of
the cooling chassis if required. Use a exible connecon to aach
the remainder of the return duct. The return duct should be
sealed to the unit casing and must terminate outside the space
containing the furnace.
x3600 x
=Cubic Feet Per RevoluonBTU/HR
INPUT # Seconds Per Revoluon
Heang
Value
Adjustments – Heang Secon
Temperature Rise
At me of installaon, the temperature rise must be adjusted to
be within the range specied on the unit rang plate. See table 2.
Pressure Regulator
he gas input must not exceed the gures shown on the rang plate.
The unit is equipped for rated inputs with manifold pressures of:
3.5” W.C. for natural gas and 10.5” W.C. for propane.
The manifold pressure can be measured by removing the pipe
plug in the automac gas valve. Connect a water manometer and
measure the pressure.
Only small variaons in gas input may be made by adjusng the
regulator. In no case should the nal manifold pressure vary
more than 0.3” W.C. for natural gas or 0.7” W.C. for propane.
To adjust the regulator, turn the adjusng screw on the regulator
clockwise to increase pressure and input or counterclockwise to
decrease pressure and input.
For natural gas installaons, check the burner rate by observing
the gas meter (making sure that all other gas appliances are
turned o). The test hand on the meter should be med for
at least one revoluon. Note the number of seconds for one
revoluon.
Adjustments – Cooling Secon (HWC models)
No adjustments are required or should be aempted regarding
any of the components of the cooling chassis. The chassis should
be checked to see that none of the wiring is loose or missing.
Cooling chassis is charged with R410A refrigerant.
Pressure Regulator
Model
Number
Filter Area
(sq. in.)
HWC8-12 300
HWC8-18 480
HWC8-24 480
HWC8-30 480
Minimum Required Surface Area
for Disposable Filters
Table 1

Page 8 of 18 507388-01Issue 1504
SCFM
Temp
Rise
(F°)
SCFM
Temp
Rise
(F°)
SCFM
Temp
Rise
(F°)
SCFM
Temp
Rise
(F°)
208 365 49 340 53 315 N/A 285 N/A
230 425 42 405 44 380 47 350 51
208 445 40 415 43 390 46 365 49
230 515 35 485 37 455 39 430 42
208 620 29 585 31 555 32 520 34
230 685 26 650 28 610 29 570 31
208 365 N/A 340 N/A 315 N/A 285 N/A
230 425 63 405 N/A 380 N/A 350 N/A
208 445 60 415 65 390 N/A 365 N/A
230 515 52 485 55 455 59 430 62
208 620 43 585 46 555 48 520 52
230 685 39 650 41 610 44 570 47
208 480 N/A 465 N/A 450 N/A 435 N/A
230 610 44 590 45 565 47 535 50
208 750 36 715 38 685 39 655 41
230 810 33 770 35 735 37 700 38
208 860 31 815 33 770 35 735 37
230 880 30 835 32 790 34 750 36
208 480 N/A 465 N/A 450 N/A 435 N/A
230 610 59 590 61 565 63 535 N/A
208 750 48 715 50 685 52 655 55
230 810 44 770 46 735 49 700 51
208 860 42 815 44 770 46 735 49
230 880 41 835 43 790 45 750 48
208 480 N/A 465 N/A 450 N/A 435 N/A
230 610 73 590 N/A 565 N/A 535 N/A
208 750 60 715 63 685 65 655 68
230 810 55 770 58 735 61 700 64
208 860 52 815 55 770 58 735 61
230 880 51 835 54 790 57 750 60
TAP 1 (HEAT) 208 or 230 735 49 700 51 670 53 640 56
TAP 2 (HEAT) * 208 or 230 825 43 795 45 770 46 745 48
TAP 3 (HEAT) 208 or 230 895 40 865 41 840 43 810 44
TAP 4 (COOL) 208 or 230 800 765 735 715
TAP 5 (COOL) 208 or 230 880 845 820 795
TAP 1 (HEAT) 208 or 230 735 61 700 64 670 67 640 70
TAP 2 (HEAT) * 208 or 230 825 54 795 56 770 58 745 60
TAP 3 (HEAT) 208 or 230 895 50 865 52 840 53 810 55
TAP 4 (COOL) 208 or 230 800 765 735 715
TAP 5 (COOL) 208 or 230 880 845 820 795
55 40
LOW
0.1 " w.c. 0.2 " w.c. 0.3 " w.c. 0.4 " w.c.
Model
Rise
Range
(F°)
Mid
Rise
(F°)
Indoor Blower
Speed
HWC8(R/N)360912A 35
Unit
Voltage
(V)
-
LOW
MED
HWC8(R/N)240912A 25
-
MED *
HIGH
-
65 50
HIGH *
HWC8(R/N)360918A
HWC8(R/N)360924A
25
LOW
55 40
LOW
MED *
HIGH
LOW
HWC8(R/N)480918A
HWC8(R/N)480924A
35 - 65 50
75 60
MED *
HIGH
HIGH *
60
HWC8(R/N)600918A
HWC8(R/N)600924A
45 -
HWC8(R/N)480930A 30 -
HWC8(R/N)600930A -
AIRFLOWS AND HEATING TEMPERATURE RISES
AS A FUNCTION OF EXTERNAL STATIC PRESSURE
N/A: Do not operate unit in heating mode using this blower speed at this external static pressure. Outside of temperature rise range.
* : As shipped speed for heating operation
Table 2
75 60
45
45
MED
Table 2

Page 9 of 18507388-01 Issue 1504
Blower
The unit contains a direct-drive, mulspeed blower. The proper
speeds have been preset at the factory for heang and cooling.
Refer to the wiring diagram for recommended
heang/cooling speeds for specic models. Direct-drive blower
motors are permanently lubricated and do not require oiling.
Limit Control
A xed temperature limit control is provided which will shut
o the gas to the main burners if the unit is overheated for any
reason. The control must not be adjusted or relocated.
High Altude Adjustments (U.S. Installaons)
Rangs shown on the rang plate are for elevaons up to 2000
feet. For elevaons above 2000 feet, rangs should be reduced at
a rate of 4% for each 1000’ above sea level. Refer to the Naonal
Fuel Gas Code Z223.1 (latest edion) for further explanaon.
High Altude Adjustments (Canadian Installaons)
High altude conversions may be made by the manufacturer’s
authorized representave, in accordance with the requirement
of the manufacturer, provincial, or territorial authories having
jurisdicon, and in accordance with the requirements of CAN/CGA
B149.1 or B149.2 Installaon Code. A high altude conversion kit,
available from the manufacturer and approved for this purpose,
must be used.
Installaon and Operaon in Extremely Cold Weather Areas
In areas where extremely cold (below – 20°F) outdoor temperatures
can be expected, some additional installation and operating
precauons should be taken. The following precauons are taken
to prevent possible vent system ice blockage that could result in
safety shutdown of the burners:
1. Adjust to the highest achievable temperature rise within
the rise and stac pressure ranges specied on the rang
plate. Depending on specic model, it may be possible to
change to a lower heang blower speed tap to get a higher
temperature rise. This also increases comfort.
2. Make sure there are no leaks of outside air into the return
air system.
3. Keep the outside louver grille as free as possible of any ice
that may form and obstruct the ue outlet.
START-UP
For Your Safety Read Before Lighng
If you do not follow these instrucons exactly, a re or
explosion may result causing property damage, personal
injury, or loss of life.
WARNING
This furnace is equipped with a direct ignion control. Do
not aempt to manually light the burners.
CAUTION
To Shut Down Main Burners
1. Turn o electrical power to unit.
2. Move the ON/OFF switch to the “OFF” posion
(see Figure 4).
To Light Main Burners
1. Turn o electrical power to unit.
2. Turn the thermostat to lowest seng.
3. Move the gas valve ON/OFF switch to the “ON” posion (see
Figure 4).
4. Turn on electrical power to the unit.
5. Set the room thermostat to the desired temperature.
(If the thermostat “set” temperature is above room
temperature aer the pre-purge me expires, main burners
will light.)
Gas Valve
Figure 4
Gas Inlet
ON/OFF
SWITCH
Gas Inlet
Pressure
test tap
Regulator
adjustment
Screw
(Under Cap)
Gas manifold
Pressure test
tap

Page 10 of 18 507388-01Issue 1504
OPERATION
Operaon of the unit is automac and will provide heang and
cooling depending on the seng of the thermostat.
Heang
1. Turn on main power supply.
2. Open manual gas shuto valve.
3. Set thermostat system to “HEAT”.
4. Set thermostat to temperature desired.
Cooling
1. Turn on main power supply.
2. Set thermostat system switch to “COOL”.
3. Set thermostat to temperature desired.
Heang Sequence of Operaon
1. Thermostat calls for heat.
2. Combuson blower starts and proper air ow is proven by
the pressure switch closing.
3. Blower connues to operate for 30 seconds prior to the
burners lighng.
4. Ignion control begins spark and opens gas valve. The
burners are lit. Ignion is proved through the ame sensor.
5. Circulang air blower starts 30 seconds aer the burners
light.
6. When the thermostat is sased, the burners and combuson
blower shut o.
7. Circulang air blower will shut o 120 seconds later.
If the burners should fail to ignite, the ignion control will try to
ignite the burners a total of three mes. Should the burners fail
to ignite within the three trials for ignion, the ignion control
will lock out for 1 hour before beginning another ignion cycle.
To reset the control, turn the thermostat down or o for 10
seconds and then set to desired seng. At this me, the ignion
sequence will try again.
Blower Control
The blower will start approximately 30 seconds after the
burners ignite and will stop approximately 120 seconds aer the
thermostat is sased. The me delay is preset at the factory
and ming can not be adjusted.
Cooling Sequence of operaon
When the thermostat system switch is set for “COOL”, the blower
will start 5 seconds aer the thermostat calls for cooling and will
stop 90 seconds aer the thermostat is sased.
Connuous Fan Operaon
Connuous operaon of the air handling blower will be obtained
if the thermostat fan switch is set to “ON”. With the thermostat
fan switch set to “AUTO”, the air handling blower will cycle
corresponding with the thermostat cycling.
To Shut Down Unit
For temporary or short periods of shutdown, set the thermostat
system switch to “OFF”. For a prolonged period of shutdown, set
the thermostat system switch to “OFF” and turn o the electrical
power supply and the gas supply to the unit.
The HWC8 burner & manifold assembly, combuson inducer
assembly, and ignition control board mounting are newly
designed for improved service access over previous models. Refer
to Figure 5 for heang cabinet component layout.
It is recommended that the furnace be inspected annually by a
qualied service person.
MAINTENANCE
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, Serious injury, death or property
damage.
Improper servicing could result in dangereous operaon,
Serious injury, death or property damage
•Before servicing. disconnect all electrical power to
furnace
•When servicing controls, label all wires prior to
disconnecting reconnect wires correctly.
• Any disassembly of components containing ue
or vent gases shall be done by a qualied service
agency.
•Verify proper operation after servicing.
WARNING