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I Installation Instructions Combination Units I
8. Start-up Procedure
tion and be damaged. It is therefore necessary to check for
proper rotation.
CAUTION
Electrical shock, fire and/or explosion hazard.
Use extreme care during all of the following
checks and procedures.
Make sure Electric Power and is turned OFF as
instructed in appropriate steps.
Failure to follow this warning can result in prop-
erty damage, personal injury, and/or death.
Check the unit's operation as outlined in the following
instructions.
Blower and Phasing Check
1. Shut OFF electric power at unit disconnect.
2. Check to see that clean, properly sized air filters are
installed.
3. Check to see that everything inside the unit is clear and
ready to operate safely. Ensure that there are no ob-
jects in, on or around the motor, belt or blower wheel.
Do NOT operate the unit with the compressor(s) run-
ning until proper blower rotation has been confirmed by
running the following test.
7. Set thermostat fan switch to ON. The circulating air
blower should come ON.
.
Shut OFF electric power at unit disconnect and visual-
ly observe the direction of the blower rotation as it
slows down. Do NOT put hands or any other object in,
on or around the belt, motor or blower wheel. If blower
wheel rotation is the same as the directional arrow on
the blower housing, proceed to the next step.
CAUTION
If blower rotation is incorrect, shut electric power OFF at
unit disconnect and reverse any two supply wires at
field connections ONLY. Do NOT reverse the blower
and/or compressor leads or rewire any internal wiring.
After rewiring is done, repeat blower rotation check to
ensure that blower rotation is now correct.
9. If blower rotation iscorrect, reset thermostat fan switch
to AUTO.The circulating air blower should go OFF.
Nothing should be running.
10. Shut OFF electric power at unit disconnect.
4. Set thermostat Heat-Cool selector to OFF.
5. Set thermostat fan switch to AUTO.
Moving parts hazard.
Do NOT put hands or any other object in, on or
around the motor, belt or blower wheel. Ensure
that there are no objects in, on or around the mo-
tor, belt or blower wheel before turning electric
power on.
Failure to follow this warning can result in prop-
erty damage, personal injury, and/or death.
,
Turn ON electric power. Nothing should start running.
If any unusual arcing, odors or noises are encoun-
tered, shut OFF electric power immediately and check
for wiring errors.
NOTE: The circulation blower motor and compressor(s) are
three phase and are factory synchronized for proper rota-
tion. Even if the circulation blower motor comes on and air
seems to be circulating, it is possible that the blower motor
rotation isincorrect due to improperphasmg. The scroll com-
pressor(s) (if equipped) will run backwards under this condi-
Cooling Checks
The compressors have a five minute anti-cycle delay that is
activated whenever the compressors turn off. For instance, if
the unit is manually shut off when the compressors are run-
ning and the unit isturned back on two minutes later, it will be
an additional three minutes before the compressors will re-
start.
CAUTION
Do NOT operate the unit with the compressor(s) run-
ning until proper blower rotation has been confirmed
during the Blower and Phasing Check in the previous
section. If the phasing is incorrect, the scroll compres-
sor(s) (if equipped) will run backwards and they will be
damaged.
1. Be sure that electric power is OFF.
2. To check cooling Stage 1, place jumper wires across
low voltage terminal board terminals R to G, R to Y1.
3. Turn electric power ON. Check to see that the follow-
ing occurs:
a. Compressor 1 - ON
b. Condenser fan motor(s) - ON
c. Circulation air blower - ON with correct rotation
and adequate airflow from ductwork.
[_ 513 01 1002 00
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