Manual 2100-366
Page 12
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, and
respectively. 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.
SECTION 7 • AIR CONDITIONING START
UP PROCEDURE CRANKCASE HEATERS
FOR NON-SCROLL COMPRESSOR UNITS
Some single and three phase models have an insertion
well-type heater located in the lower section of the
compressor housing. This is a self-regulating type
heater that draws only enough power to maintain the
compressor at a safe temperature.
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
SECTION 8 • VENTILATION OPTION
ASSEMBLIES
The standard Barometric Fresh Air Damper (BFAD)
allows up to 25% outside fresh air to be introduced to
the building whenever the main unit comfort air
blower is operating.
The optional Blank Off Plate (BOP) is installed on
the inside of the vent option door to cover the air inlet
openings which eliminates outside air from entering
the unit.
The optional Motorized Fresh Air Damper (MFAD)
allows up to 25% outside fresh air to be introduced to
the building through a two position damper which can
be fully open or closed.
The optional Commercial Room Ventilator (CRV)
allows up to 50% outside fresh air to be introduced to
the building and includes a built-in exhaust damper.
The CRV complies with ASHRAE Standard 62-89
“Ventilation for Acceptable Indoor Air Quality”.
WARNING
Leakage of products of combustion into
the living area may result in asphyxiation
resulting in injury or death
