Printed in u.S.A. 440 04 4321 04 july 2012 service and technical support manual two−stage, ecm blower motor 35” tall, high efficiency condensing gas furnace (f/g)9mxt save this manual for future reference. Safety labeling and signal words danger, warning, caution, and note the signal words danger, w...
440 04 4321 04 specifications are subject to change without notice. 2 safety considerations improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult...
Service and technical manual gas furnace: (f/g)9mxt 440 04 4321 04 3 specifications subject to change without notice. Start−up check sheet for psc models (f/g)9mxt (this sheet is optional. Keep for future reference.) date of start−up: dealer name: address: city, state(province), zip or postal code: ...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 4 440 04 4321 04 start−up, adjustment, and safety check general 1. Furnace must have a 115-v power supply properly connected and grounded. Note: proper polarity must be maintained for 115-v w...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 5 ! Warning fire or explosion hazard failure to follow this warning could result in personal injury, death, and/or property damage. Never purge a gas line into a combustion cha...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 6 440 04 4321 04 2. Obtain average yearly gas specific gravity from local gas supplier. 3. Find installation altitude in table 3. 4. Find closest natural gas heat value and specific gravity i...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 7 k. Leave manometer or similar device connected and proceed to step 2. 2. Adjust manifold pressure to obtain high fire input rate. (see figure 3) a. Jumper r to w/w1 and w2 th...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 8 440 04 4321 04 figure 4 example of two−stage furnace control board test / twin hum plt pl1 w2 y1 dhum g com w/w1 y/y2 r 24v fuse 3−amp eac−2 eac−1 l1 bl−1 xfmr l2 com hi ht cool lo h t spar...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 9 table 3 orifice size and manifold pressure (in. W.C.) for gas input rate a11252a s a g l a r u t a n f o y t i v a r g c i f i c e p s s a g . G v a heat value 0.58 0.60 0.62...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 10 440 04 4321 04 table 3 (cont.) orifice size and manifold pressure (in. W.C.) for gas input rate s a g l a r u t a n f o y t i v a r g c i f i c e p s s a g . G v a heat value 0.58 0.60 0.6...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 11 table 4 blower speed taps color speed factory attached to: gray 5 cool yellow 4 spare blue 3 hi ht orange 2 spare red 1 lo ht/cont fan for low−heat, the following connection...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 12 440 04 4321 04 table 6 air delivery - cfm (with filter 1 ) unit size return-air connection speed taps 2 external static pressure (in.W.C.) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0401410 s...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 13 service and maintenance procedures fire, injury or death hazard failure to follow this warning could result in personal injury, death and/or property damage. The ability to ...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 14 440 04 4321 04 figure 7 heating and cooling application wiring diagram with single−stage thermostat 115-volt field- supplied fused disconnect junction box control box 24-volt terminal bloc...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 15 8. Release blower door switch, reattach wire to “r” terminal on furnace control board and replace blower door. Care and maintenance fire or explosion hazard failure to follo...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 16 440 04 4321 04 4. If the vent and combustion air pipe passes through the blower compartment, it will be necessary to remove the pipes from the blower compartment. Disconnect the vent and c...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 17 electrical operation hazard failure to follow this warning could result in personal injury or death. Blower door switch opens 115−v power to control. No component operation ...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 18 440 04 4321 04 6. Attach the green/yellow wire and ground terminal to one of the manifold mounting screws. 7. Install the remaining manifold mounting screws. 8. Check the igniter alignment...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 19 5. Attach a funnel with a flexible tube to port on the collector box. 6. Flush inside of collector box with water until discharge water from condensate trap is clean and run...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 20 440 04 4321 04 figure 12 cleaning heat exchanger cell note: after cleaning, inspect the heat exchangers to ensure they are free of all foreign objects that may restrict flow of combustion ...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 21 figure 14 service label 338313−2f.
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 22 440 04 4321 04 figure 15 wiring diagram 338313−2f.
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 23 figure 16 troubleshooting guide − flow chart is le d s tat us lig ht on s oli d, alt ern atel y flashi ng bri ght -d im -b rig ht- dim lik e a hea rtb ea t, o r fl ashi ng o...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 24 440 04 4321 04 figure 16 (cont.) troubleshooting guide − flow chart 1 + 2 bl o w er on af t e r po w e r up – (11 5v or 24v ) – no rm al o pe rati on. Blower r u ns f or 9 0 se co n ds, if...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 25 sequence of operation note: furnace control must be grounded for proper operation or control will lockout. Control is grounded through green wire connected to gas valve and ...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 26 440 04 4321 04 15. Two−stage thermostat and two−stage heating (see figure 17 − figure 22 for thermostat connections) note: in this mode the tt switch (sw1−1) must be on to select the two−s...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 27 (same speed as lo heat), and begin a low−heat cycle. The blower motor blwm will remain on until the end of the prepurge period, then shut off for 24 seconds then come back o...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 28 440 04 4321 04 figure 20 two−stage furnace with two−stage heat pump (dual fuel) note 9 figure 21 ac with two−stage furnace, humidifier, and dehumidification figure 22 hp with two−stage fur...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 440 04 4321 04 29 parts replacement information guide casing group control door blower door top filler plate bottom filler plate door knob assembly electrical group control box junction box l...
Service and technical support manual gas furnace: (f/g)9mxt specifications subject to change without notice. 30 440 04 4321 04 product nomenclature digit position 1 2 3 4 5 6, 7, 8 9, 10 11, 12 13 14 g 9 m x t 060 17 14 a 1 g = mainline look 1 f = mainline look 2 n = entry 9 = 90% − 100% efficiency ...