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507788-01Cmrcool.comPage 16 of 20
Air Flow - Cooling Blower Speed
capacity rating of the air handler (Tap 3).
If the outdoor unit is smaller than the maximum cooling
chart (Table 2).
ELECTRIC SHOCK HAZARD!
servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
WARNING
Adjusting Blower Speed
Motor Speed Taps
NOTE -
the MAHM*ETA
recommended that the CFM be adjusted to approximately
400 CFM per ton.
Tap Operation Remarks
1 Continuous fan Continuous fan speed is
energized (24 volt input to G).
2
speed nominal capacity (e.g. if 3-ton
outdoor unit).
3
no electric heat
4*
electric heat element has a call
for heat.
5 High static
applications
of Tap 4)
* Tap 4 is minimum setting for electric heat
Table 3.
Operation Inspection
NOTE:
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 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. Set thermostat to FAN ON.
2.
Check Unit Operation
1. Set thermostat to force a call for cooling (approximately
2. The outdoor unit should turn on immediately.
3.
system is moving cooled air.
4. Set the thermostat 5ºF higher than the indoor
should cycle off. Air handler should cycle off 45
seconds after the outdoor unit shuts off.
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