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# 45466K003

Page 2

SAFETY

The following is a list of safety rules and precautions that

must be followed when installing this furnace.

1. Use only with the type of gas approved for this

furnace. Refer to the furnace rating plate.

2. Install this furnace only in a location and position as

specified in the 

Location

 section on page 3 of these

instructions.

3. Provide adequate combustion and ventilation air to the

furnace space as specified in the 

Combustion and

Ventilation Air 

section on page 4 of these instructions.

4. Adequate clearance must be provided around the

vent-air intake terminals as specified in the 

Venting

section beginning on page 5 of these instructions.

5. Combustion products must be discharged outdoors.

Connect this furnace to an approved vent system only,

as specified in the 

Venting

 section beginning on page 5

of these instructions.

6. Never test for gas leaks with an open flame. Use a

commercially available soap solution made specifi-

cally for the detection of leaks to check all connec-

tions, as specified in 

Gas Supply and Piping

beginning on page 15 of these instructions.

7. Always install furnace to operate within the furnace

s

intended temperature-rise range with a duct system

which has an external static pressure within the

allowable range, as specified in 

Temperature Rise

on page 21 of these instructions. See furnace rating

plate.

8. When a furnace is installed so that the supply ducts

carry air circulated by the furnace to areas outside the

space containing the furnace, the return air shall also

be handled by duct(s) sealed to the furnace casing

and terminating outside the space containing the

furnace. See 

Circulating Air Supply

 on page 15 of

these instructions.

9. A gas-fired furnace for installation in a residential

garage must be installed as specified in the 

Location

section on page 3 of these instructions.

10. The furnace is not to be used for temporary heating of

buildings or structures under construction as specified

in the 

Location

 section on page 3 of these instructions.

In the State of Massachusetts:
This product must be installed by a licensed

Plumber or Gas Fitter. When flexible connec-

tors are used, the maximum length shall not

exceed 36". When lever-type gas shutoffs are

used, they shall be T-handle type.

  WARNING

Summary of Contents for CG90CB

Page 1: ...regulations or requirements take precedence over the general instructions in this manual IMPORTANT Do not store combustible materials including gasoline and other flammable vapors and liquids near the...

Page 2: ...Supply and Piping beginning on page 15 of these instructions 7 Always install furnace to operate within the furnace s intended temperature rise range with a duct system which has an external static p...

Page 3: ...in respect to the heat distribution system as much as practicable When installed in a utility room the door should be wide enough to allow the largest part of the furnace to enter or permit the repla...

Page 4: ...nated Combustion Air Excessive exposure to contaminated combustion air will result in safety and performance related problems The recommended source of combustion air is outdoor air However the use of...

Page 5: ...tside combustion air An inlet air restrictor plate see Figure 1 is supplied with this furnace and can be found in the plastic bag containing these Installation Instructions and the User s Information...

Page 6: ...on that cannot be removed by stirring Refer to Table 2 for approved piping and fitting materials cement is recommended Metal or plastic strapping may be used for vent pipe hangers When making ABS join...

Page 7: ...NR Not Recommended Minimum Pipe Diameter 112 000 125 000 BTU HR Models Minimum Pipe Diameter 90 000 100 000 BTU HR Models e p i P t n e V h t g n e L t f s w o b l E 0 9 f o r e b m u N 0 1 2 3 4 5 6...

Page 8: ...r a e l C D e h t e v o b a d e t a c o l t i f f o s d e t a l i t n e v o t e c n a r a e l c l a c i t r e V e h t m o r f m c 1 6 t e e f 2 f o e c n a t s i d l a t n o z i r o h a n i h t i w l...

Page 9: ...C D e h t e v o b a d e t a c o l t i f f o s d e t a l i t n e v o t e c n a r a e l c l a c i t r e V e h t m o r f m c 1 6 t e e f 2 f o e c n a t s i d l a t n o z i r o h a n i h t i w l a n i m...

Page 10: ...n the same pressure zone There fore in horizontal venting applications they must be on the same side of the house within the parameters shown in Figure 6 On initial start up of the unit some of the wa...

Page 11: ...8 For vertical venting refer to Figure 9 The vent pipe on horizontal runs must slope upward away from the furnace at a minimum pitch of 1 4 per foot of run to prevent accumulation of condensate Figur...

Page 12: ...er to Figure 12 for detail of this inlet air assembly On initial start up of the unit some of the water used to prime the trap system may run down into the combustion blower and cause noise Do not cem...

Page 13: ...Prime the trap system by slowly pouring 1 cup of water down the vent pipe For horizontal venting refer to Figure 13 For vertical venting refer to Figure 14 The vent pipe on horizontal runs must slope...

Page 14: ...sed openings in the common venting system 2 Visually inspect the venting system for proper size and horizontal pitch as required in the National Fuel Gas Code ANSI Z223 1 NFPA 54 latest edition or the...

Page 15: ...rnace A return air duct system is recommended If the unit is installed in a confined space or closet a return connection must be run full size to a location outside the closet The air duct in the clos...

Page 16: ...ividual manual shutoff valve during any pressure testing of the gas supply piping system at test pressure equal to or less than 1 2 psig 3 5 kPa or 14 W C If the piping system is to be tested at press...

Page 17: ...2 filter are supplied with the furnace Models designed for more than 1600 CFM nominal air delivery include two of each The filter rack is to be installed between the return air duct and the side of th...

Page 18: ...onic Air Cleaner Terminals are provided on the blower control board for connection of a 120 volt electronic air cleaner The EAC terminal is energized whenever the thermostat is calling for heat coolin...

Page 19: ...because some gas is heavier than air and will settle on the floor What to do if you smell gas Do not try to light any appliances Extinguish any open flame Do not touch any electric switch do not use a...

Page 20: ...ay The call for cooling has priority over continuous fan operation while a call for heating has priority over both a call for cooling or continuous fan Ignition lockouts for any reason do not affect c...

Page 21: ...t the regulator turn the adjusting screw s on the regulator clockwise to increase pressure and input coun terclockwise to decrease pressure and input Replace the barbed fitting and reconnect the hose...

Page 22: ...a e H e u l a V t f U T B 3 d l o f i n a M e r u s s e r P C W n i g n i t a e H e u l a V t f U T B 3 d l o f i n a M e r u s s e r P C W n i 0 0 0 2 8 4 9 0 5 3 8 7 2 2 0 0 0 1 6 6 6 9 0 0 0 0 3 4...

Page 23: ...cked or plugged the furnace will not operate properly MAINTENANCE Failure to follow the safety warnings exactly could result in dangerous operation serious injury death or property damage Improper ser...

Page 24: ...ower housing assembly Blower wheel Blower motor Blower motor mount Blower motor capacitor Burner Group Gas manifold Main burner orifices Main burners Accessories ALPKT572 Natural Gas to Propane Conver...

Page 25: ...emory A pushbutton switch is located on the control see Figure 22 on page 26 When the pushbutton switch is pressed and released the control flashes the stored fault codes The most recent fault code is...

Page 26: ...45466K003 Page 26 Figure 22 Connection Diagram P N 45198 005...

Page 27: ...45466K003 Page 27 Figure 23 Schematic Diagram P N 45198 005...

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