13
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.
!
WARNING
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 condenser--fan blade is correctly
positioned in fan orifice. Top 1/3 of condenser--fan
blade should be within fan orifice venturi.
c.
Ensure fan hub is positioned correctly with respect
to motor housing (See Fig. 11).
d.
Make sure that air filter(s) is in place.
e.
Make sure that condensate drain trap is filled with
water to ensure proper drainage.
f.
Make sure that all tools and miscellaneous loose
parts have been removed.
FIGURE 11
Fan Blade Clearance
FAN GRILLE
MOTOR
1/8" MAX BETWEEN
MOTOR AND FAN HUB
MOTOR SHAFT
1/2ý
START--UP
Step 1—CHECK FOR REFRIGERANT LEAKS
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--22 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--22 refrigerant, using a volumetric
charging cylinder or accurate scale. Refer to unit rating
plate for required charge. Be sure to add extra
refrigerant to compensate for internal volume of filter
drier.
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 inside the burner or blower access
door) to start the heating section.
NOTE
: Make sure that gas supply has been purged, and
that all gas piping has been checked for leaks.
FIGURE 12
Burner Assembly
MANIFOLD
PIPE PLUG
FIGURE 13
Monoport Burner
MANIFOLD
BURNER
BURNER FLAME
