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4- Removethecollectorboxlocatedbehindthecombus-
tionairinducer.Becarefulwiththecollectorboxgas-
ket.Ifthegasketisdamaged,it mustbereplacedto
preventleakage,
5- Labelthewiresfromgasvalveandrolloutswitches,
thendisconnectthem.
6- Disconnectgassupplypiping.Removefourscrewsse-
curingtheburnermanifoldassemblytothevestibule
panelandremovetheassemblyfromtheunit,
NOx INSERTS
(X models only)
/
FIGURE 31
7 - NOx units only- Remove the three screws that attach
the NOx insert to the corbel at the entrance to each
heat exchanger section, Carefully remove the NOx in-
sert from each section, See figure 31.
8 - Insert the brush end of cable snake into the top of one
of the heat exchanger openings, Do not force the
cable into the heat exchanger. Insert the cable and
operate the drill on slow speed. Move the cable in and
out of the heat exchanger section three or four times or
until sufficient cleaning is accomplished. Reverse drill
and slowly work the cable out of opening,
9- Repeat procedure for each heat exchanger section.
10- After each of the top heat exchanger sections has been
cleaned, insert the brush end of the cable snake into
the bottom openings of each of the heat exchanger
sections and clean as described in step 8,
11- Remove the cable from the heat exchanger. Use a vac-
uum cleaner to remove debris knocked loose during
cleaning.
12- Attach the exhaust end (positive pressure) of the vacu-
um cleaner to the top of the heat exchanger section,
Any loose debris will be forced to the bottom of the heat
exchanger section, Vacuum debris from bottom open-
ings.
13- Replace collector box and combustion air inducer.
Check gaskets for damage. Damaged gaskets must be
replaced to avoid heat exchanger leaks. Replace all
screws to the collector box and combustion air inducer.
Failure to replace all screws may cause leaks,
14- To clean the burner, run a vacuum cleaner with a soft
brush attachment over the face of burners. Visually in-
spect inside the burners and crossovers for any blockage
caused by foreign matter. Remove any blockage,
15- NOx Units - Reattach the NOx inserts to the corbels at
the entrance to each heat exchanger opening, See fig-
ure 31,
16- Replace burner/manifold assembly onto the vestibule
panel,
17- Reconnect wires to pressure switch, roll-out switches,
gas valve and combustion air inducer. Refer to unit wir-
ing diagram,
18- Reconnect vent pipe to combustion air inducer outlet,
19- Reconnect gas supply piping,
20- Turn on power and gas supply to unit,
21- Set thermostat and check for proper operation,
22- Check all piping connections, factory and field, for gas
leaks. Use a leak detecting solution or other preferred
means,
AkCAUTION
23- Ira leak is detected, shut gas and electricity offand
repair leak,
24- Repeat steps 23 and 24 until no leaks are detected.
25- Replace front access panel.
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