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SERVICE
CAUTION - Turn off gas and electrical power to unit
before performing any maintenance or service
operations on this unit. Remember to follow lighting
instructions when putting unit back into operation after
service or maintenance.
Burners
1- Periodically examine burner flames for proper
appearance during the heating season.
2- Before each heating season examine the burners
for any deposits or blockage that may have
occurred.
3- Clean burners as follows:
a-Turn off both electrical and gas supplies to unit.
b-Disconnect gas supply piping, high tension and
sensor leads. Remove gas manifold. Remove
burner tray.
c-Clean burners as necessary. Make sure that
burner heads line up properly to ensure flame
crossover. Check spark gap on electrode and
adjust if required. The gap should be between
0.110 inch and 0.140 inch (2.79mm to 3.56mm).
The gap may be checked with appropriately sized
twist drills or feeler gauges.
d-Reinstall burner tray, gas manifold, high tension
and sensor leads. Reconnect gas supply piping.
e-Restore electrical power and gas supply. Follow
lighting instructions to light unit. Check burner
flame.
Flue Passageway and Flue Box
The flue passages and flue box should be inspected
and cleaned prior to each heating season. The
sequence of operation should be as follows:
1- Turn off both electrical and gas supply to unit.
2- Disconnect combustion air blower wiring.
3- Remove screws securing flue box to unit. Remove
flue box. If necessary, remove blower assembly
from flue box. Clean flue box with wire brush.
4- Remove turbulator retention bracket and
turbulators. Clean turbulators with wire brush.
5- Remove burners as described in section “Burners"
section.
6- Clean tubes with a wire brush.
7- Reassemble unit. The combustion air and flue box
gaskets should also be replaced during
reassembly.
8- Restore electrical power and gas supply. Follow
lighting instructions to light unit. Check operation of
unit.
Combustion Air Blower
Under normal operating conditions, the combustion air
blower should be checked and cleaned prior to the
heating season with the power supply disconnected.
Use a small brush to clean blower wheel.
Electrical
1- Check all wiring for loose connections.
2- Check for correct voltage at unit (unit operating).
3- Check amperage draw.
Flue and Air Inlet
Check all vent and air inlet joints for tightness. Ensure
that connections are sealed and that there are no
blockages.
Failure to Operate
If unit fails to operate check the following:
1- Is thermostat calling for heat?
2- Is main disconnect closed?
3- Is there a breaker tripped or a fuse blown?
4- Is gas turned on at meter?
5- Is manual shutoff valve open?
6- Is unit ignition system in lock out? If unit locks out
again, call service technician to inspect unit.
7- Is combustion air inducer proving switch closed?
Obstructed flue will cause unit to shut off at
combustion air inducer proving switch. Check flue
passage and outlet.
Repair Parts
When ordering repair parts include the complete unit
model number listed on the unit rating plate. For
example: TUA045SNAF1.
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