Page 2 - REGISTERED QUALITY SYSTEM; er; at; IST; Fig. 2—Multipoise Orientation
SAFETY CONSIDERATIONS Recognize safety information. This is the safety-alert symbol . When you see this symbol on the furnace and in instructions ormanuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, CAUTION,and NOTE. These words are used with the saf...
Page 3 - Fig. 3—Bottom Filter Arrangement; WASHABLE; Fig. 4—Filter Installed for Side Inlet
Turn off the gas and electrical supplies to the unit beforeperforming any maintenance or service. Follow the operatinginstructions on the label attached to the furnace. Failure tofollow this warning could result in personal injury or death. The minimum maintenance that should be performed on thisequ...
Page 4 - Step 3—Cleaning Burners; Table 1—Speed Selection
Clean blower motor and wheel as follows: 1. Turn off electrical supply to furnace. 2. Remove main furnace door and blower access panel. 3. Disconnect blower motor wires from furnace control. Field thermostat connections may need to be disconnecteddepending on their length and routing. 4. Remove cont...
Page 5 - Step 4—Cleaning Heat Exchangers; Fig. 5—Burner Box Assembly; MANIFOLD
6. Remove burner box pressure tube from gas valve regulator fitting. 7. Remove screws that secure manifold to burner box. (See Fig. 5.) NOTE: Do not remove burner box from cell panel. 8. Remove manifold, orifices, and gas valve as 1 assembly. 9. Remove screws attaching burner assembly in burner box....
Page 6 - Step 5—Flushing Collector Box and Drainage System; Fig. 6—Cleaning Inlet Openings of Primary Heat; PAM
The ground wire from the gas valve MUST be attached to theburner box attachment screw. Failure to attach this groundwire to an adequate casing ground will cause the furnacecontrol to lock out. NOTE: Be sure burner box gasket is installed between burner box and cell panel. (See Fig. 5.) If gasket is ...
Page 7 - Step 6—Servicing Hot Surface Igniter; Fig. 8—Furnace Pressure and Drain Tubing Diagram; TUBE ROUTING
12. Reconnect pressure tubes to pressure switch. See diagram on main furnace door for proper location of tubes. Be sure tubesare not kinked. (See Fig. 8.) 13. Turn on gas and electrical supplies to furnace. 14. Check furnace operation through 2 complete heat operating cycles. Check area below induce...
Page 8 - Step 7—Electrical Controls and Wiring; BURNER FLAME; Fig. 10—Gasket on Collector Box; RTV
1. Turn off gas and electrical supplies to furnace. 2. Remove main furnace door. 3. Disconnect igniter wire connection. 4. Check igniter resistance. a. Using an ohm meter, check resistance across both igniter leads in connector. b. Cold reading should be between 45 ohms and 90 ohms. c. If ohm readin...
Page 9 - Fig. 12—Control Center
Fig. 11—Field Wiring A99440 115-V FIELD- SUPPLIED DISCONNECT AUXILIARYJ-BOX 24-V TERMINAL BLOCK THREE-WIRE HEATING-ONLY FIVE WIRE NOTE 1 NOTE 2 FIELD-SUPPLIEDDISCONNECT CONDENSINGUNIT TWOWIRE FURNACE C O N T R O L R G COM W C R G Y GND GND FIELD 24-V WIRINGFIELD 115-, 208/230-, 460-V WIRINGFACTORY 2...
Page 10 - Fig. 13—Winterizing the Furnace
Step 8—Checking Heat Tape Operation (If Applicable) If this furnace is to be operated in an unconditioned spacewhere the ambient temperatures may be 32°F or lower, freezeprotection measures must be taken. (See Fig. 13.) SeeCONDENSATE DRAIN PROTECTION section of Installa-tion, Start-Up, and Operating...
Page 12 - Fig. 16—Wiring Diagram; PCB
Fig. 16—Wiring Diagram A02157 PCB TR A N FRS NOTE #11 LS PRS (WHEN USED) LGPS FUSED OR CIRCUIT BREAKER DISCONNECT SWITCH (WHEN REQ’D) NOTE #2 JB L1 L1 BLWR HI/LO TO 115VAC FIELD DISCONNECT NOTE #2 EQUIPMENT GROUND SPARE-1 HEAT FAN COOL HSIR EAC-1 START OL HI MED HI MED LO LO BLWM SCHEMATIC DIAGRAM (...
Page 13 - Fig. 17—Service Label; SERVICE; refer to twinning kit instructions.; LED CODE; 2 BLOWER ON AFTER POWER UP (115 VAC or 24 VAC) -Blower runs for 90; - Low inlet gas pressure; COMPONENT TEST
→ Fig. 17—Service Label A02270 SERVICE To initiate the component test sequence, shut OFF the room thermostat or disconnectthe "R" thermostat lead. Briefly short the TEST/TWIN terminal to the "Com 24V" ter-minal. Status LED will flash code and then turn ON the inducer motor. The induc...
Page 14 - OUBLESHOO
A02204a Is LED status light on? Is LED status light b linking r apidly without a pause? Is LED status light b linking ON/OFF slo wly with a combination of shor t and long flashes? Deter mine status code . The status code is a 2 digit n umber with the first digit deter mined b y the n umber of shor t...