16
PERIODIC INSPECTIONS
GAS HEATING UNITS
1. The flow of combustion and ventilating air shall
not be blocked or otherwise obstructed in any way.
The indoor blower, evaporator coil and filters should be
inspected monthly.
At least once each year, a qualified serviceman should
check out all of the items listed under the servicing and
trouble shooting and maintenance section of this manual.
2. If the induced draft blower/motor assembly has
to be replaced, care must be taken to provide an air-
tight seal between the blower housing and the burner
box. High temperature silicone sealant must be used to
ensure a good seal.
3. GAS BURNERS
THE BURNERS SHOULD NEVER REQUIRE
CLEANING.
If cleaning becomes necessary, it indicates faulty opera-
tion of the unit. The cleaning should only be done by a
qualified service agency and only after consultation with
an AAON Service Representative.
It is recommended that if the gas burners require cleaning,
call an AAON Service Engineer at (918) 583-2266.
4. HEAT EXCHANGER
The necessity for cleaning the exchanger could indicate
faulty operation and should only be checked by a quali-
fied service agency and only after they have discussed
the problem with a Service Representative.
▲
!
WARNING
Once each year, before the unit is in
operation for the heating season, a qualified
service technician should inspect ALL flue
product carrying areas of the furnace and
main burners for continued safe operation.
COOLING
1.
Main Power Switches are on and power is to the unit.
2. Set thermostat in cooling mode and place the
"fan" switch to on. Check blower for correct operating
direction, amperage and voltage.
3. PACKAGED UNITS - Check compressor(s)
operation. Check the amperage and compare to the
nameplate data (check amperage load side of the com-
pressor contactor).
4. DX COIL UNITS - If applicable check remote
condenser as per the manufacturer's recommendations.
5. CHILLED WATER UNITS - Check remote chiller
operations as per the manufacturers instructions.
Check coolant flow valves for correct operation and
settings.
HEATING • NATURAL GAS
1. Before turning on the main electrical power
switch, be sure that all gas supply lines have been
purged of air.
2. Turn gas valve to "ON" position.
3. Turn main electrical power switch to "ON" and
set the thermostat to call for heat. The vent motor
should operate. The control will automatically supply
energy to the spark gap and the gas valve after the
thermostat contact closes.
4. The sensing probe detects the presence of the
flame. (Should no flame be detected in 10 seconds, the
ignition system will recycle. If no flame is detected in 3
tries, the ignition system will lockout.)
5. Adjust thermostat to a low temperature setting
to open contacts. The main gas flames should be extin-
guished.
NOTE: The evaporator blower is controlled by the
ignition system. In the fan "Auto" mode the blower
comes on 45 seconds after flame is proved and goes off
120 seconds after the thermostat opens.
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