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13
Use the Start-- Up Checklist supplied at the end of this book and
proceed as follows to inspect and prepare the unit for initial
start--up:
1. Remove access panel.
2. Read and follow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with unit.
3. Make the following inspections:
a. Inspect for shipping and handling damage, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a
refrigerant leak.
c. Leak-- test all refrigerant tubing connections using
electronic leak detector, or liquid-- soap solution. If a
refrigerant leak is detected, see following Check for
Refrigerant Leaks section.
d. Inspect all field-- and factory--wiring c onnections. Be
sure that connections are c ompleted and tight.
e. Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
f. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
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.
!
WARNING
4. Verify the following conditions:
a. Make sure gas line is free of air. Before lighting the unit
for t he 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 fo r 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 r epair.
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 a
volumetric charging cylinder or accurate scale. Refer to unit
rating plate for required c harge.
Step 2 — Start-- up Heating and Make Adjust-
ments
Complete the required procedures given in the Pre--Start-- Up
section before starting t he 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 t he lighting instructions on the heating section operation
label (located inside the burner or blower access door) to start the
heating s ection.
NOTE: Make sure that gas supply has been purged, and that all
gas piping has been checked for leaks.
Pipe Plug
Manifold
A07679
Fig. 12 -- Burner Assembly
MANIFOLD
BURNER
BURNER FLAME
C99021
Fig. 13 -- Monoport Burner
Check Heating Control
Start and check the unit for proper heating control operation as
follows (see furnace lighting i nstructions located inside burner or
blower 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.
48ES