Grandaire WFAR Series, Service And Technical Support Manual

Page 1: ...nual in the following manner CAUTION Signal Words on Product Labeling Signal words are used in combination with colors and or pictures or product labels The signal word WARNING is used throughout this...

Page 2: ...eath WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE...

Page 3: ...1 115vac terminal is energized whenever blower operates HUM 24vac terminal is only energized when the low pressure switch LPS is closed on a call for heat Prime Condensate Trap with Water CARBON MONO...

Page 4: ...ns to match the required orifice to the manifold pressure to the heat content and specific gravity of the gas To do this 1 Obtain average yearly gas heat value at installed altitude from local gas sup...

Page 5: ...ld be clear blue almost transparent See Fig 12 i Remove jumper R to W j Reinstall manifold pressure tap plug from gas valve 2 Verify natural gas input rate by clocking meter NOTE Contact your HVAC dis...

Page 6: ...e S Shortened furnace life S Component damage Temperature rise must be within limits specified on furnace rating plate Recommended operation is at midpoint of rise range or slightly above CAUTION Jump...

Page 7: ...thermostat per thermostat instructions and install on sub base or wall 5 Install blower access door Electronic thermostat Set cycle rate for 3 cycles per hr Check Safety Controls The flame sensor gas...

Page 8: ...0 2743 3048 18 20 0 81 Derate multiplier factors are based on midpoint altitude for altitude range ON OFF Switch Regulator Seal Cap Regulator Adjustment Regulator Seal Cap under Cap 1 2 NPT Outlet 1 8...

Page 9: ...290 22 164 327 818 64 56 112 281 23 157 313 783 66 54 109 273 24 150 300 750 68 53 106 265 25 144 288 720 70 51 103 257 26 138 277 692 72 50 100 250 27 133 267 667 74 48 97 243 28 129 257 643 76 47 9...

Page 10: ...10 440 04 7113 02 Specifications subject to change without notice 338309 201 Rev E A11602 Fig 5 Service Label Information...

Page 11: ...2 42 3 3 42 3 4 915 825 43 3 6 43 3 7 43 3 8 42 3 2 850 44 3 8 43 3 5 43 3 6 43 3 7 875 44 3 6 44 3 7 43 3 4 43 3 5 4000 900 44 3 4 44 3 5 44 3 7 44 3 8 1219 925 44 3 2 44 3 4 44 3 5 44 3 6 950 44 3...

Page 12: ...4 2134 700 43 3 5 43 3 7 43 3 8 42 3 2 725 44 3 8 43 3 4 43 3 5 43 3 6 750 44 3 5 44 3 7 44 3 8 43 3 4 8000 775 44 3 3 44 3 4 44 3 5 44 3 7 2438 800 44 3 1 44 3 2 44 3 3 44 3 4 825 44 2 9 44 3 0 44 3...

Page 13: ...0 1110 1100 1090 1065 1035 990 935 870 805 Red 3 2 0 433 940 920 910 890 865 830 790 745 690 625 100C048C SIDE BOTTOM Black 4 0 373 1715 1660 1610 1555 1490 1420 1340 1245 1150 1065 Yellow 3 3 5 379 1...

Page 14: ...ECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death There may be more than one electrical supply to the furnace Check accessories and cooling unit for additio...

Page 15: ...s shown If any of the original wire as supplied must be replaced use same type or equivalent wire W Y GND THERMOSTAT TERMINALS 1 2 3 A11387 Fig 7 Typical Single Stage Wiring Diagram Component Self Tes...

Page 16: ...ene cigarette lighter fluid dry cleaning fluids or other volatile fluids 3 Paint thinners and other painting compounds paper bags or other paper products Exposure to these materials could lead to corr...

Page 17: ...wer compartment Disconnect the vent and combustion air pipe by a Loosen the clamps on the vent couplings and combustion air pipe external to the furnace b Separate the pipes from the couplings and mov...

Page 18: ...hut off or gas meter 3 Remove control door and set aside 4 Turn electric switch on gas valve to OFF 5 Disconnect the gas pipe from gas valve and remove pipe from the furnace casing 6 Remove individual...

Page 19: ...ng could result in personal injury death and or property damage Turn off the gas and electrical supplies to the furnace and install lockout tag before performing any maintenance or service Follow the...

Page 20: ...a problem exists which needs to be corrected such as improper adjustment of manifold pressure insufficient or poor quality combustion air improper vent termination incorrect size or damaged manifold...

Page 21: ...may occur CAUTION 1 Obtain propylene glycol RV swimming pool antifreeze or equivalent 2 Turn off gas and electrical supplies to your furnace 3 Remove furnace control door 4 Remove the top unused rubbe...

Page 22: ...Fig 12 Burner Flame SET SCREW MOTOR WHEEL HUB MOTOR SHAFT FLAT SCREW MOTOR ARM GROMMET SCREW LOCATION BLO HSG ASSY BRACKET BRACKET ENGAGEMENT SEE DETAIL A CAPACITOR OR POWER CHOKE WHEN USED BRACKET SC...

Page 23: ...440 04 7113 02 23 Specifications subject to change without notice FLAME SENSOR BELOW BURNER FLAME ROLLOUT SWITCH BRACKET IGNITER IGNITER BURNER SUPT ASSY BURNER ASSY A11403 Fig 14 Burner Assembly...

Page 24: ...If the burner flame is proven the blower motor is energized on HEAT speed 25 sec after the gas valve GV is energized Simultaneously the electronic air cleaner terminal EAC 1 is energized and remains e...

Page 25: ...flash the status code of the previous fault or status code 11 1 short and 1 long flash if there was no previous fault After the control repeats the code 4 times the control will go through a brief co...

Page 26: ...control will repeat the ignition sequence 3 more times before lockout 14 occurs If flame signal is lost during the blower on delay period blower will come on for the selected blower off delay Check t...

Page 27: ...440 04 7113 02 27 Specifications subject to change without notice 339236 2 Rev A Fig 16 Wiring Diagram...

Page 28: ...on service or maintenance can cause personal injury property damage or death Consult a qualified installer service agency or your local gas supplier for information or assistance The qualified install...