46201200402
15
Specifications are subject to change without notice.
4. Verify the following conditions:
a. Make sure gas line is free of air. Before lighting the unit
for the first time, perform the following with the gas
valve in the OFF position:
NOTE
: If the gas supply pipe was not purged before connecting
the unit, it will be full of air. It is recommended that the ground
joint union be loosened, and the supply line be allowed to purge
until the odor of gas is detected. Never purge gas lines into a
combustion chamber. Immediately upon detection of gas odor,
retighten the union. Allow 5 minutes to elapse, then light unit.
b. Ensure fan hub is positioned correctly with respect to
motor housing.
c. Make sure that air filter(s) is in place.
d. Make sure that condensate drain trap is filled with water
to ensure proper drainage.
e. Make sure that all tools and miscellaneous loose parts
have been removed.
START--UP
Step 1 — Check for Refrigerant Leaks
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
!
WARNING
Proceed as follows to locate and repair a refrigerant leak and to
charge the unit:
1. Locate leak and make sure that refrigerant system pressure
has been relieved and reclaimed from both high-- and
low--pressure ports.
2. Repair leak following accepted practices.
NOTE
: Install a filter drier whenever the system has been opened
for repair.
3. Add a small charge of R--410A refrigerant vapor to system
and leak--test unit.
4. Recover refrigerant from refrigerant system and evacuate to
500 microns if no additional leaks are found.
5. Charge unit with R--410A refrigerant, using an accurate
scale. Refer to unit rating plate for required charge.
Step 2 — Start--up Heating and Make Adjust-
ments
Complete the required procedures given in the Pre--Start--Up
section before starting the unit. Do not jumper any safety devices
when operating the unit. Make sure that burner orifices are
properly aligned. Unstable operation my occur when the burner
orifices in the manifold are misaligned.
Follow the lighting instructions on the heating section operation
label (located on the inside of the control access panel) to start the
heating section.
NOTE
: Make sure that gas supply has been purged, and that all
gas piping has been checked for leaks.
Pipe Plug
Manifold
A07679
Fig. 13 -- Burner Assembly
MANIFOLD
BURNER
BURNER FLAME
C99021
Fig. 14 -- Monoport Burner
Check Heating Control
Start and check the unit for proper heating control operation as
follows (see furnace lighting instructions located on the inside of
the control access panel):
1. Place room thermostat SYSTEM switch in the HEAT
position and the fan switch is placed in AUTO position.
2. Set the heating temperature control of the thermostat above
room temperature.
3. The induced--draft motor will start.
4. On a call for heating, the main burner should light within 5
sec. of the spark being energized. If the burners do not light,
there is a 22--sec. delay before another 5--sec. try. If the
burners still do not light, this sequence is repeated. For
3--phase models if the burners do not light within 15
minutes from the initial call for heat, there is a lockout. For
single phase models, if the burners do not light on the 4
th
ignition attempt, there is a lockout. To reset the control,
break the 24--v power to W.
5. For 3--phase models the evaporator fan will turn on 45 sec.
after the flame has been established. The evaporator fan will
turn off 45 sec. after the thermostat has been satisfied. For
single phase models the evaporator fan will turn on 30 sec.
after the flame has been established. The evaporator fan will
turn off 90 sec. after the thermostat has been satisfied.
Please note that the integrated gas unit controller (IGC) has
the capability to automatically reduce the evaporator “ON”
delay and increase the evaporator “OFF” delay in the event
of high duct static and/or partially--clogged filter.
Check Gas Input
Check gas input and manifold pressure after unit start--up (See
Table 6). If adjustment is required proceed as follows:
P
G
D4,
P
GS
4,
W
P
G4
