FlueAnd Chimney
1 - Checkfluepipe,chimneyandallconnectionsfortight- nessandtomakesurethereisnoblockage,
2 - Checkunitforproperdraft,
3 - Ispressureswitchclosed?Obstructedfluewillcause unittoshutoffatpressureswitch,Checkflueandoutlet forblockages.
4- Resetmanualflamerolloutswitcheson burnerbox cover.
FailureToOperate Iftheunitfailstooperate,checkthefollowing:
1 - Isthethermostatcallingforheat?
2 - Areaccesspanelssecurelyinplace?
3 - Isthemaindisconnectswitchclosed?
4 - Istherea blownfuse?
5 - Isthefilterdirtyorplugged?Dirtyorpluggedfilterswill causethelimitcontroltoshuttheunitoff.
6 - Isgasturnedon atthemeter?
7 -
8 -
9 - Istheunitignitionsysteminlockout?Iftheunitlocksout again,calltheservicetechniciantoinspecttheunitfor blockages.
,AWARNING
A,CAUTION
At the beginning of each heating season, a qualified techni- cian should check the system as follows:
Blower
Check the blower wheel for debris and clean if necessary. The blower motors are prelubricated for extended bearing life. No further lubrication is needed.
Filters
All G50UH(X) filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure that the furnace operates prop- erly. Replacement filters must be rated for high velocity air- flow. Table 1 lists recommended filter sizes.
Flue And Chimney
Check the flue pipe, chimney and all connections for tight- ness and to make sure there is no blockage,
Electrical
1 - Check all wiring for loose connections.
2 - Check for the correct voltage at the furnace (furnace operating),
3 - Check
Motor NameplateActual
Cleaning the Heat Exchanger and Burners
NOTE - Use papers or protective covering in front of the fur- nace during cleaning.
Cleaning the heat exchanger requires a steel spring "snake," a reversible drill and a vacuum cleaner, The steel spring snake may be constructed by purchasing a 4 ft. long by 1/4 inch diameter steel wire cable and a 1/4 inch diame- ter wire brush, These items are available at a hardware
store. Insert wire end of brush into the open end of the spring cable. Crimp the cable around the brush so that the brush is secured and will not come off during cleaning, At- tach the other end of the cable to the reversible drill to com- plete the tool for cleaning the heat exchanger.
1 - Turn off both electrical and gas power supplies to fur- nace.
2 - Remove flue pipe and top cap from the unit. Label the pressure switch wires, then disconnect them.
3 - Remove the four screws that secure the combustion air inducer. Carefully remove the combustion air inducer to avoid damaging blower gasket. If gasket is damaged, it must be replaced to prevent leakage. See figure 30.
G50UH(X) BURNER & HEAT
EXCHANGER REMOVAL
H EAT
BURNER BOX ASSEMBLY
,&WARNING
FIGURE 30
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