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507787-01Cmrcool.comPage 18 of 22
Check-Out Procedures
NOTE:
instructions.
Pre-Start-Up Checks
• Is the air handler properly and securely installed?
•
• Will the unit be accessible for servicing?
• Has an auxiliary pan been provided under the unit
could cause damage?
• Have ALL unused drain pan ports been properly
plugged?
• Has the condensate line been properly sized, run,
trapped, pitched, and tested?
• Is the duct system correctly sized, run, sealed, and
insulated?
•
• Is the indoor coil factory-installed TXV or RFC properly
sized for the outdoor unit being used?
• Have all unused parts and packaging been disposed
of?
•
•
• Is the unit properly grounded and protected (fused)?
•
location?
• Are all access panels in place and secure?
Check Blower Operation
1.
come on.
Check Cooling Operation
1. Set thermostat to force a call for cooling (approximately
2. The outdoor unit should come on immediately and the
later.
3.
system is moving cooled air.
4. Set the thermostat 5ºF higher than the indoor
should cycle off.
1. Set thermostat to call for auxiliary heat (approximately
minimum of 3 minutes for all sequencers to cycle on.
2. Set the thermostat so that it does not call for heat.
Operation
Time Delay Relay
1. When cooling demand is initiated, there is a 1 second
motor-on delay.
2. After the motor-on delay expires, motor ramps up
3.
seconds.
4.
1
SECOND
DELAY
OFF
100%
CFM
100%
CFM
45
SECS
COOLING
DEMAND
1
2
3 4
Figure 18. Blower Time Delay
When the thermostat calls for cooling, 24 volts is put on
relay energizes. The normally open contacts close, causing
and Y is completed, closing the circuit to the contactor in
the outdoor unit, starting the compressor and outdoor fan
motor.
On heat pumps, circuit R and O energizes the reversing
reversing valve remains energized as long as the
and outdoor unit should cycle off. Air handler should cycle
off 45 seconds after the outdoor unit shuts off.
and W is completed, and the heat sequencer is energized.
on the thermostat sub-base, or they may also be connected
to a second stage on the sub-base.
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