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WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Do not purge gas supply into the combustion chamber. Do
not use a match or other open flame to check for gas leaks.
Use a commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
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. Make sure that outdoor- -fan blade is correctly positioned
in the fan orifice.
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
WARNING
!
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.
mixtures of air or gases containing
oxygen can lead to an explosion.
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 Puron (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 Puron (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
Pressurized
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):
For 208/230 VAC Models:
1. Place room thermostat SYSTEM switch in the HEAT posi-
tion and the fan switch in AUTO position.
2. Set the heating temperature control setting several degrees
higher than the room temperature reading.
3. The induced- -draft motor will always start on high speed for
the ignition sequence, regardless of the heating stage called.
4. After a pre- -purge time of 15 sec with the induced- -draft mo-
tor on high speed, the sparker will be energized for 3- -to- -8
sec, and the gas valve will be energized on low stage. If the
burners do not light, there is a 20- -sec delay before another
ignition attempt. If the burners still do not light by the 4
consecutive ignition attempt, there is a lockout. To reset the
lockout, break the 24- -v power to W1 and W2.
15
Manifold
Fig. 11 - - Burner Assembly
BURNER FLAME
BURNER
Fig. 12 - - Monoport Burner
A07679
MANIFOLD
C99021
th
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