ECR EMI America Series Installation, Operation And Maintenance Manual page 57

Q: How long will the fan run?
A: While the unit is in cooling or heating
and auto fan mode is selected, the fan will
cycle with the call for cooling or heating.
When the room temperature reaches
setpoint temperature, the heat/cool call
is dropped. The fan will then stay on for
an additional 60-second to purge unit
of any residual energy. Placing the fan
selection switch on the wall mounted
thermostat in the ON position will cause
the fan to run continuously regardless of
the set point temperature.
P/N 240007756, Rev. A [051509]
CACG/CAHG & CACH/CAHH
• Installation, Operation and Maintenance Manual •
Frequently Asked Questions
(continued)
Q: What causes my indoor unit to freeze-
up?
A: Air handlers freeze up is usually the
symptom of another problem. The Cas-
sette air handler is equipped with freeze
protection to prevent freeze up from
occurring. If freeze up does occur then
check the following.
– Check that the freeze sensor inserted
fully and snug in the coil fins. 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 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
cooling mode when outdoor tem-
peratures are below 35°F (2°C)? 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
refrigerant charge? A system low on
refrigerant can cause air handlers
freeze-up. To check system charge
you will need to contact a qualified
refrigeration service technician.
Refrigerant charge information can
be found in IOM for the outdoor
condensing unit.
57
Air Handlers
Made in the USA