WLCG/WLHG
High-Wall Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008111, Rev. G [06/18/10]
41
Q:
What causes my indoor unit to freeze-
up?
A:
Air handler freeze up is usually the symp-
tom of another problem. Units are equipped
with freeze protection to prevent freeze up
from occurring. If freeze up does occur then
check the following.
Check that the freeze sensor located in
•
the lowest part of the coil. Generally this
is where freeze up will begin.
Check that the freeze sensor inserted fully
•
and snug in the coil fin. If not another lo-
cation may need to be selected. Be careful
not to insert the sensor directly into the
coil tube rather insert the sensor between
two tubes.
Check the indoor air filter. It should be
•
clean and free of dirt. A dirty filter will
reduce airflow and efficiency. Also check
that the coil is clean. If the coil is dirty then
it should be cleaned using an appropriate
coil cleaner or mild detergent.
Is the equipment being operated in cool-
•
ing mode when outdoor temperatures are
below 32°F? If it is, then the condenser
should be fitted with low ambient control
so that the proper system pressures are
maintained.
Does the system have the proper refriger-
•
ant charge? A system low on refrigerant
can cause coil freeze-up. To check system
charge you will need to contact a qualified
refrigeration service technician. Refriger-
ant charge information can be found in
IOM for the outdoor condensing unit.
Q:
I lost my infrared remote. How do I oper-
ate the unit?
A:
All infrared remote functions can be ac-
cessed via the unit-mounted control keypad.
Frequently Asked Questions
(continued)
