,CAUTION
At the beginning of each heating season, service itemsA
through E as described below:
A - Electrical
1 - Check all widng for loose connections.
2 - Check fur the correct voltage at the furnace (furnace
operating).
3 - Check amp-draw on the blower motor.
Motor Nameplate Actual
B - Blowers
Check the blower wheels for debris and cleanif necessary.
The blower motors are prelubdcated for extended bearing
life. No further lubrication is needed.
C - Filters
All G24M filters are installed external to the unit. Filters
shouldbe inspectedmonthly.Clean or replace the filters
when necessary to ensure properfurnace operation.See
table 13 for filter sizes. Replacement filters for
G24M.-45/60/75 unitsmusthave a minimumvelocityrating
of 400 FPM. Replacement filters for G24M-1OO/120/140
unitsrequirea minimum velocityratingof 625 FPM.
TABLE t3
Model Number
G24M-45/60/75
G24M-100/120/140
I Filter Size - Inches (ram)
16 X 20 X 1 (406 X 508 X25)
20 X 20 X 1 (508 X 508 X 25)
AWARNING
D - Flue And Chimney
Check the flue pipe, chimneyand all connectionsfor tight-
ness and to make sure there is no blockage.
E - Burners
Inspect the burners and burner flame at the beginning of
each heatingseason.If necessary,clean the burnersas in-
dicatedbelow:
1 - Turn off the electdcaland gas supplyto the furnace.
2 - Remove the burnerboxtop.
3 - Remove the burnerretaining bracket,
4 - Remove the burners,
5 - Clean the insideofeach bumer with a bottle brush as
showninfigure 27.
Cleaning Burners
BOTTLE
BRUSH
FIGURE 27
I
6-
Replace the burners and the burner retaining bracket.
Make sure the burners are propedy seated in the slots
on the tray. The burner orifice must be aligned with the
manifold.
7-
8-
Reinstall the burnerbox top.
Restoreelectrical power andgas supply to thefurnace.
Follow lighting instructions on the front of the unit.
Check the appearance of the burner flame, burner
pressure, gas flow, and temperature rise. If necessary,
make adjustments. See the other unit adjustments sec-
tion.
Heat Exchanger
Pedodicelly inspect the heat exchanger tubesand theflue
boxfor corrosionandsootdeposits.Ifnecessary,cleanas
indicatedbelow:
1 - Turn off theelectricaland gas supplyto the furnace.
2 - Disconnectthe wiringto the combustionairfan.
3 - Remove thescrews securingthe fluebox to the furnace.
Clean the flue boxwith a wire brush (brass-bd_e brush
recommended),and rags or a shop vacuum cleaner.
4 - Disconnect the gas supplypiping and the ignitor and
sensor wires. Remove the burner assembly from the
furnace.
5-
Sincethe heat exchangertubesare crimpedinseveral
locations, a thoroughdeaning of the entire lengthof
each tube is not possible. However,removeany soot
depositswhichareaccessible witha wire brush (brass-
bristlebrushrecommended),andrags ora shopvacuum
cleaner.
6 - Reinstallthe flue box using a new gasket.
7 - Reconnectthe combustionair fan wiring.
8 - Reinstall the burner box, ignitor and sensor wires and
the gas supply piping.
9 - Carefully checkall piping connections(factory andfield)
for gas leaks. Use a leakdetec_ngsolutionor other pre-
ferrad means.
AIMPORTANT
10 Restore electricalpowerand gas supply.Followlight-
ing instructionson front of unit. Check burner flame
and adjustif necessary.
Page 27
To Next Page
Loading...
Need help?
General
