Comfort-Aire FMG****X1E Series - Manual (Page 10)

10
STARTUP & ADJUSTMENTS
WARNING:
The evaporator coil is shipped from the factory
with a nitrogen charge. Use caution when
preparing coils for field connections. If repairs
make it necessary for evacuation and charging,
it should only be attempted by qualified,
trained personnel thoroughly familiar with this
equipment. Some local codes require licensed
installation service personnel to service this
type of equipment. Under no circumstances
should the equipment owner attempt to install
and/or service this equipment. Failure to comply
with this warning could result in equipment
damage, personal injury, or death.
NITROGEN
HEALTH
FLAMMABILITY
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
1
0
0
Before You Start the Unit
Prior to start-up, complete the following inspections:
√ Verify the unit is level and mounted securely to the wall.
Also make sure the air handler is properly located with
adequate clearances for servicing the unit as listed in
Table 1 (page 3).
√ Check condensate drain line(s) for proper drainage.
√ Verify the surrounding area and top of the unit is free
from obstructions and debris.
√ Check all duct connections. Make sure the duct work
is adequately sealed to prevent air leakage.
√ Check all coil connections for leaks.
√ Verify that the line voltage power leads are securely
connected and the unit is properly grounded.
√ Verify the thermostat is wired correctly. Make sure all
low voltage wires are securely connected to the correct
leads of the low voltage terminal strip.
√ Verify the power supply branch circuit overcurrent
protection is sized properly.
√ Verify filter is properly and securely installed.
IMPORTANT: Before you start the unit, perform the
following procedures to install the initial charge on units
that are factory shipped with a nitrogen holding charge:
1. Read all installation instructions first.
2. Purge the nitrogen holding charge.
3. Evacuate the unit to 350 - 500 microns.
4. Allow the unit to remain under vacuum for at least 30
minutes.
5. Inspect the unit rating plate for the proper type of
refrigerant and quantity.
6. Weigh in the proper amount of new (or reclaimed)
refrigerant.
Refrigerant Charging
The system refrigerant charge can be checked and
adjusted through the service ports provided at the front
panel. Use only gauge lines which have a Schrader
depression device present to actuate the valve.
Air Circulation
Running the Blower Continuously
Set the thermostat’s system mode to OFF and the
thermostat’s fan mode to ON. The blower motor should
run continuously. Check for air delivery at the register(s).
Ensure that there are no obstructions at the registers or
in the ducts.
Turning the Blower Off
Set thermostat’s fan mode to AUTO, the blower will shut
down immediately.
System Cooling
1. Set the thermostat’s system mode to COOL and fan
mode to AUTO. Lower the thermostat’s temperature
mode below room temperature and observe that the
blower energizes. Check the air being discharged at
the register is cooler than room temperature. Verify unit
refrigerant pressures are in order.
2. Allow the unit to run for several minutes and then set
the thermostat’s temperature above room temperature.
Verify the blower cycles off with the thermostat.
System Heating
1. Set the thermostat’s system mode to HEAT and the fan
mode to AUTO. Increase the thermostat’s temperature
above room temperature and observe that the blower
energizes. Check the air being discharged at the register
is warmer than room temperature.
2. Allow the unit to run for several minutes and then set
the thermostat’s temperature below room temperature.
Verify the blower cycles off with the thermostat.