Filter
Top Products
FlueAndChimney
1- Checkfluepipe,chimneyandallconnectionsfortight-
nessandtomakesurethereisnoblockage,
2 - Checkunitforproperdraft,
3- Ispressureswitchclosed?Obstructedfluewillcause
unittoshutoffatpressureswitch,Checkflueandoutlet
forblockages.
4- Resetmanualflamerolloutswitchesonburnerbox
cover.
FailureToOperate
Iftheunitfailstooperate,checkthefollowing:
1- Isthethermostatcallingforheat?
2 - Areaccesspanelssecurelyinplace?
3- Isthemaindisconnectswitchclosed?
4 - Istherea blownfuse?
5- Isthefilterdirtyorplugged?Dirtyorpluggedfilterswill
causethelimitcontroltoshuttheunitoff.
6 - Isgasturnedonatthemeter?
7- Isthemanualmainshut-offvalveopen?
8- Istheinternalmanualshut-offvalveopen?
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.
,&WARNING
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 amp-draw on the blower motor.
Motor Nameplate Actual
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
HEAT
BURNER BOX ASSEMBLY
FIGURE 30
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