Manual 2100-502A
Page
14 of 15
5. Restore the electrical power to the furnace
by turning the switch back on. Adjust the
thermostat to call for heating operation.
6. Observe the main burners flames. The main
burners should be mostly “blue” with
possibly a little orange (not yellow) at the
tips of the flames. The flames should be in
the center of the heat exchanger
compartments and not impinging on the
heat exchanger surfaces.
7. Observe the flames until the blower starts
(there is a normal delay 30 second period
until the heat exchanger warms up). There
should be no change in the size or shape of
the flame. If there is any wavering or
blowing of the flame on the blower start-up,
it is an indication of a possible leak in the
heat exchanger. Turn off the gas valve in
the gas line leading to the furnace, and then
the main electrical switch to the furnace and
call your service agency.
8. Replace the burner access door.
4. Inspect the vent terminal, or vent system
observing for any debris from weather,
birds, and the like. Clean if necessary.
Also check the combustion air inlet hood to
make sure it is clear. See Figure 4.
SECTION 7 • AIR CONDITIONING START
UP PROCEDURE CRANKCASE HEATERS
FOR NON-SCROLL COMPRESSOR UNITS
All models covered by this user guide utilize a
compressor crankcase heater. It is secured on the
exterior of the compressor at its base, and is controlled
internally within the control panel to be energized
anytime the compressor is off.
Some form of crankcase heat is essential to prevent
liquid refrigerant from migrating to the compressor,
causing oil pump out on compressor start-up and
possible valve failure due to compressing a liquid.
The decal in Figure 5 is affixed to all outdoor units with
crankcase heaters detailing start-up procedures.
This is
very important. Please read carefully
.
IMPORTANT
These procedures must be followed at ini-
tial start-up and at any time power has
been removed for 12 hours or longer.
To prevent compressor damage which
may result from the presence of liquid
refrigerant in the compressor crankcase.
1. Make certain the room thermostat is in
the “off” position (the compressor is not to
operate).
2. Apply power by closing the system
disconnect switch. This energizes the
compressor heater which evaporates the
liquid refrigerant in the crankcase.
3. Allow 4 hours or 60 minutes per pound
of refrigerant in the system as noted on
the unit rating plate, whichever is greater.
4. After properly elapsed time, the
thermostat may be set to operate the
compressor.
5. Except as required for safety while
servicing—Do not open system
disconnect switch.
7961-061
FIGURE 5
START-UP PROCEDURES DECAL
WARNING
Leakage of products of combustion into the
living area may result in asphyxiation
resulting in injury or death
