SEQUENCE OF OPERATION
When power is turned on and thermostat fan switch is
set to ON and the cooling indicator is set to OFF, the
indoor fan motor is energized in approximately 2 minutes.
The outdoor unit is off.
When power is turned on and thermostat fan switch is
set to ON or AUTO and the cooling indicator to COOL
the indoor and outdoor units will start.
AUTO position on the thermostat will stop and start your
system when the temperature setting is satisfied. The
ON position on the thermostat will stop the outdoor unit
only when the temperature setting is satisfied and the
indoor unit will continue to run, recirculating indoor air.
The fan coil unit is equipped with a protective device
called an anti-frost control which will automatically stop
the outdoor unit (while the indoor unit continues to run)
if ice accumulates on the indoor unit evaporator coil
causing abnormal operating conditions. When the
accumulated ice has melted, the anti-frost control will
restart the outdoor unit.
The fan coil unit is equipped with primary float switch,
and the system will automatically shut down if the drain
pan is full of water (condensate) and not draining. The
system requires service.
PRIOR TO START-UP
1. Check all electrical connections for tightness.
2. Check air filter has been installed in return air box or
filter box.
3. Remove all winter supply shut-offs and store them in a
safe place.
SYSTEM START-UP & ADJUSTMENTS
1. Place thermostat fan switch in ON position and cool-
ing indicator in OFF position. In about 2 minutes, indoor
unit blower will start.
2. Check blower operation for excess noise or vibration.
3. Check entire distribution system for leakage and apply
additional tape where necessary.
SECTION 3: START-UP & OPERATION
4. Check that system static pressure is within acceptable
limits (minimum 1.2" W.C. - maximum 1.5" W.C.). Static
readings must be taken in the plenum a minimum of 18"
from the fan coil unit, plenum tees or elbows but before
any supply run.
a. If greater than 1.5" W.C. add additional supply runs.
b. If less than 1.2" W.C. check the return air filter is
clean and return duct is not collapsed or kinked.
c. Check supply air plenum for leaks.
d. If more supply runs than recommended are used,
check that balancing orifices are in place.
5. Check that blower motor amp draw compares with
fan coil unit rating plate. Amp draw shown on plate is
the FLA of motor (not the actual running amps) and will
vary with the pressure and voltage.
6. Place the thermostat cooling indicator in COOL
position, which will start the outdoor unit. Let the system
run at least 30 minutes to stabilize operating conditions.
7. For outdoor unit start-up, follow manufacturer’s
instructions.
8. Check that temperature drop across evaporator coil
in the indoor unit is between 20°F to 28°F.
NOTICE: Do not introduce refrigerant liquid to system
through suction port. Liquid in the suction line may
damage the compressor.
NOTICE: Before adding refrigerant to system verify
Item #4 in “System Start-up & Adjustment” section
has been performed.
9. Verify that system refrigerant is correct by measuring
subcooling at liquid service port. Subcooling should be
10°F to 13°F.
10. Check the super heat leaving the evaporator coil
against the corresponding suction pressure from the
schrader fitting at the fan coil unit. Superheat value
should be between 9° and 12°F.
11. If a sight glass has been installed on the liquid line at
the air handler check for the presence of flashing. If
flashing is occuring, check and adjust subcooling by
adding refrigerant.
CHARGING COOLING ONLY SYSTEMS
After start-up, allow the system to operate for approxi-
mately 30 minutes in order to establish stable operating
conditions. Check that the temperature drop across
the evaporator coil is 20°F to 30°F. Do not attempt to
adjust the charge at ambient temperatures below 65°F.
18
Summary of Contents for ESP-G SYSTEM
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