507746-01
Issue 1821
Page 37 of 39
•
Replace disposable filters. Cleanable filters can be
cleaned by soaking in mild detergent and rinsing with
cold water.
•
Install new/clean filters with the arrows on the side
pointing in the direction of airflow. Do not replace a
cleanable (high velocity) filter with a disposable (low
velocity) filter unless return air system is properly
sized for it.
• If water is dripping from the secondary drain line, a
problem exists which should be investigated and
corrected. Contact a licensed professional service
technician.
Professional Maintenance
Failure to follow instructions will cause damage to the
unit.
This unit is equipped with an aluminum coil. Aluminum
coils may be damaged by exposure to solutions with
a pH below 5 or above 9. The aluminum coil should
be cleaned using potable water at a moderate pressure
(less than 50psi). If the coil cannot be cleaned using
water alone, use of a coil cleaner with a pH in the range
of 5 to 9 is recommended. The coil must be rinsed
thoroughly after cleaning.
In coastal areas, the coil should be cleaned with potable
water several times per year to avoid corrosive buildup
(salt).
NOTE
Checkout Procedures
NOTE:
Refer to outdoor unit installation instructions for
system start-up instructions and refrigerant charging
instructions.
Pre-Startup Checks
• Is the air handler properly and securely installed?
•
If horizontally configured, is the unit sloped up to 1/4
inch toward drain lines?
• Will the unit be accessible for servicing?
• Has an auxiliary pan been provided under the unit
with separate drain for units installed above a finished
ceiling or in any installation where condensate overflow
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?
• Have all cabinet openings and wiring been sealed?
• Is the indoor coil factory-installed expansion valve
properly sized for the outdoor unit being used?
• Have all unused parts and packaging been disposed
of?
•
Is the filter clean, in place, and of adequate size?
• Is the wiring neat, correctly connected, and in
accordance with the wiring diagram?
• Is the unit properly grounded and protected (fused)?
• Is the thermostat correctly wired and in a good
location?
• Are all access panels in place and secure?
Check Blower Operation
• Set thermostat to FAN ON.
• The indoor blower should come on.
Check Cooling Operation
• Set thermostat to force a demand for cooling
(approximately 5ºF lower than the indoor ambient
temperature).
• The outdoor unit should come on immediately and the
indoor blower should start between 30 - 60 seconds
later.
•
Check the airflow from a register to confirm that the
system is moving cooled air.
• Set the thermostat 5ºF higher than the indoor
temperature. The indoor blower and outdoor unit
should cycle off.
Check Electric Heater (If Used)
• Set thermostat to call for auxiliary heat (approximately
5°F above ambient temperature). The indoor blower
and auxiliary heat should come on together. Allow a
minimum of 3 minutes for all sequencers to cycle on.
• Set the thermostat so that it does not call for heat.
Allow up to 5 minutes for all sequencers to cycle off.
