PRE-START-UP
F;filure to observe the following warnings could result in
serious personal injuu:
1. Follow recognized safety practices and wear protec-
tive goggles when checking or servicing refiigerant
system.
2. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is in
place and secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected.
4. Relieve all pressure from system before touching or
disturbing anything inside temrinal box if refrigerant
leak is suspected mound compressor terminals.
5. Never attempt to repair soldered connection while re-
frigerant system is under pressure.
6. Do not use torah to remove any component. System
contains oil and refrigerant under pressure. To remove
a component, wear protective goggles and proceed as
follows:
a. Shut off gas to unit and then electrical powel:
b. Reclaim or recover refrigerant to relieve all
pressure from system using both high-pressure
and low-pressure ports.
c. Cut component connection tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs
when necessary. Oil can ignite when exposed
to torch flame.
Proceed as follows to inspect and prepare the unit for initial
st_ut-up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING. CAU-
TION, and INFORMATION labels attached to, or
shipped with, unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such as
broken lines, loose parts, or disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections
and on unit base. Detecting oil generally indicates
a refrigerant leak. Leak-test all refrigerant tubing
connections using electronic leak detector, halide
torch, or liquid-soap solution.
c. Inspect all field-wiring and factory-wiring con-
nections. Be sure that connections are completed
and tight. Be sure that wires are not in contact with
refrigerant tubing or sharp edges.
d. Inspect coil tins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that condenser-fan blades are correctly
positioned in fan orifice. See Condenser-Fan
Adjustment section on page 39 for more details.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain trap is filled with
water to ensure proper drainage.
d. Make sure that all tools and miscellaneous loose
parts have been removed.
START-UP
Unit Preparation--Make sure that unit has been
installed in accordance with installation instructions and appli-
cable codes.
Gas Piping -- Check gas piping for leaks.
Disconnect gas piping from unit when leak
testing at pressure greater than 1/2 psig. Pres-
sures greater than 1/2 psig will cause gas
valve damage resulting in hazardous condi-
tion. If gas valve is subjected to pressure
greater than I/2 psig, it must be replaced
before use. When pressure testing field-
supplied gas piping at pressures of 1/2 psig
or less, a unit connected to such piping must
be isolated by manually closing the gas
valve.
Return-Air Filters--Make sure correct filters are
inst;dled in unit (see Table 1). Do not operate unit without
return-air filters.
Outdoor-Air Inlet Screens -- Outdoor-air inlet screen
must be in place before operating unit.
Compressor Mounting -- Compressorsare internally
spring mounted. Do not loosen or remove compressor hold-
down bolts.
Crankcase Heaters -- Crankcase heaters ;ue energized
as long as there is power to the unit, the compressor is not oper-
ating, and ambient temperature is below 75 IF.
Internal Wiring--Check all electric_d connections in
unit control boxes. Tighten as required.
Refrigerant Service Ports--Each unit system has
4 Schmder-type service ports: one on the suction line, two on
the liquid line, and one on the compressor dischmge line. Be
sure that caps on the ports are tight.
High Flow Refrigerant Valves -- Three high flow
valves m'e located on the hot gas tube coining out of the com-
pressol: the suction tube going into the compressor, and the
liquid line leaving the condensel: Lmge black plastic caps iden-
tify these valves. These valves have O-rings inside which screw
the cap onto a brass body to prevent leaks. No field access to
these v;dves is available at this time. Ensure the plastic caps re-
main on the v_dves and are tight or the possibility of refrigerant
leakage could occur
Compressor Rotation -- On 3-phaseunits with scroll
compressors, it is important to be cert;fin compressor is rotating
in the proper direction. To determine whether or not comples-
sor is rotating in the proper dilection:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor
3. The suction pressure should diop and the discharge pres-
sure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pies-
sure does not rise to normal levels:
1. Note that the evaporator fan (size 006 and 007 only) is
probably also rotating in the wrong direction.
2. Turn off power to the unit and install lockout tag.
3. Reverse any two of the unit power leads.
4. Reenergize to the compressoc Check plessmes.
2O
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