EMI WLHA - Page 34

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WLCA/WLHA High Wall Evaporator
34
TROUBLESHOOTING PROCEDURE Continued
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 n. If not
another location 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 lter. It should
be clean and free of dirt. A dirty lter
will reduce airow and efciency.
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.
Frequently Asked Questions Continued
• Is the equipment being operated
in cooling mode when outdoor
temperatures are below 60°F? If it
is, then the condenser should be
tted with low ambient control so
that the proper system pressures
are maintained.
• Does the system have the proper
refrigerant charge? A system low
on refrigerant can cause evaporator
freeze-up. To check system charge
you will need to contact a qualied
refrigeration service technician.
Refrigerant charge information can
be found in IOM for the outdoor
condensing unit.