Pre-Start-Up - Carrier 50HJQ004-007 Installation, Start-Up And Service Instructions Manual

PRE-START-UP

Failure to observe the following warnings could result in
serious personal injury:
1. Follow recognized safety practices and wear protec-
tive goggles when checking or servicing refrigerant
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 and tagged with
lockout tags.
4. Relieve all pressure from system before touching or
disturbing anything inside terminal box if refrigerant
leak is suspected around compressor terminals. Use
accepted methods to recover refrigerant.
5. Never attempt to repair soldered connection while re-
frigerant system is under pressure.
6. Do not use torch 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 electrical power to unit and tag
disconnect.
b. Recover refrigerant to relieve all pressure from
system using both high- 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
start-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.
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- and factory-wiring connections.
Be sure that connections are completed and tight.
d. Inspect coil fins. 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. Refer to Outdoor-Fan
Adjustment section on page 36 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.
Unit Preparation —
stalled in accordance with installation instructions and applica-
ble codes.
Return-Air Filters —
stalled in unit (see Table 1). Do not operate unit without return-
air filters.
Outdoor-Air Inlet Screens —
must be in place before operating unit.
Compressor Mounting —
spring mounted. Do not loosen or remove compressor hold-
down bolts.
Internal Wiring —
unit control boxes; tighten as required.
Refrigerant Service Ports —
Schrader-type service ports: one on the suction line, one on the
liquid line, and one on the compressor discharge line. Be sure
that caps on the ports are tight.
High Flow Valves —
and suction tubes are High Flow Valves. Large black plastic
caps distinguish these valves with o-rings located inside the
caps. These valves cannot be accessed for service in the field.
Ensure the plastic caps are in place and tight or the possibility
of refrigerant leakage could occur.
Compressor Rotation —
tant to be certain compressor is rotating in the proper direction.
To determine whether or not compressor is rotating in the prop-
er direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pres-
sure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pres-
sure does not rise to normal levels:
1. Note that the indoor fan (006 and 007 three-phase units
only) is probably also rotating in the wrong direction.
2. Turn off power to the unit and tag disconnect.
3. Reverse any two of the unit power leads.
4. Turn on power to the unit and energize compressor.
The suction and discharge pressure levels should now move
to their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direc-
tion, the unit makes an elevated level of noise and does not
provide cooling.
Cooling —
Set space thermostat to OFF position. Set sys-
tem selector switch at COOL position and fan switch at AUTO
position. Adjust thermostat to a setting below room tempera-
ture. Compressor starts on closure of contactor.
Check cooling effects at a setting below room temperature.
Check unit charge. Refer to Refrigerant Charge section on
page 37.
Reset thermostat at a position above room temperature.
Compressor will shut off.
TO SHUT OFF UNIT — Set system selector switch at OFF
position. Resetting thermostat at a position above room tem-
perature shuts unit off temporarily until space temperature ex-
ceeds thermostat setting. Units are equipped with Cycle-
LOC™ protection device. Unit shuts down on any safety trip
and remains off; an indicator light on thermostat comes on.
Check reason for safety trip.
33
START-UP
Make sure that unit has been in-
Make sure correct filters are in-
Outdoor-air inlet screen(s)
Compressors are internally
Check all electrical connections in
Each unit system has 3
Located on the compressor hot gas
On 3-phase units it is impor-