AAON RK-60 - Manual (Page 7)

7
PERIODIC INSPECTION PROCEDURES Continued
ELECTRIC, STEAM, HOT WATER, COOLING &
CHILLED WATER UNITS
1. Indoor blower, coils and filters should be in-
spected monthly.
2. Once each year, before unit is turned on for the
heating season, a qualified serviceman should inspect
the unit for proper operation.
3. Inspect all valves and steam traps in accor-
dance with manufacturers recommendations.
WARNING: All of the items listed under the service,
trouble shooting and maintenance section of this manual
should be performed once a year.
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.
HEATING • ELECTRIC
1.
Set thermostat in the heat mode.
2. Set thermostat to call for heat to engage all
electric heat strips. Check blower for proper rotation
and voltage.
3. Measure the amperage and voltage. Compare
them to the nameplate data.
HEATING • STEAM OR HOT WATER
1.
Set thermostat in the heat mode.
2. Observe supply blower for proper rotation and
voltage.
3. Check boiler or hot water operations according
to the manufacturers instructions.
4. Check control flow valves for correct operation
and settings per manufacturers instructions.
NOTE:
Should any of the above functions not perform properly,
the following sequence of operations are given for the
various heating and cooling modes with various control
systems for an additional analysis in the case of any
problems.
▲
! WARNING
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit to
OFF at disconnect switch(es). Unit may have
multiple power supplies.