Pre-Start-Up/Start-Up; Start-Up, General; Unit Preparation; Additional Installation/Inspection - Carrier 50JC04-06 Service And Maintenance Instructions

PRE-START-UP/START-UP

WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury or
death.
1. Follow recognized safety practices and wear approved
Personal Protective Equipment (PPE), including safety
glasses and gloves when checking or servicing refrig-
erant system.
2. Do not use a torch to remove any component. System
contains oil and refrigerant under pressure. To remove
a component, wear PPE and proceed as follows:
a. Shut off all electrical power to unit. Apply appli-
cable lockout/tag-out procedures.
b. Recover refrigerant to relieve all pressure from
system using both high-pressure and low pressure
ports.
c. Do not use a torch. Cut component connection
tubing with tubing cutter and remove component
from unit.
d. Carefully un-sweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
3. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is in
place and secured.
4. Do not remove compressor terminal cover until all
electrical power is disconnected and approved lock-
out/tag-out procedures are in place.
5. Relieve all pressure from system before touching or dis-
turbing anything inside terminal box whenever refriger-
ant leak is suspected around compressor terminals.
6. Never attempt to repair a soldered connection while
refrigerant system is under pressure.
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death.
The unit must be electrically grounded in accordance with
local codes and NEC ANSI/NFPA 70 (American National
Standards Institute/National Fire Protection Association).
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, CAUTION,
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 con-
nections using electronic leak detector, halide torch,
or liquid-soap solution.
c. Inspect all field-wiring and factory-wiring connec-
tions. Be sure that connections are completed and
tight. Be sure that wires are not in contact with refrig-
erant tubing or sharp edges.
d. Inspect coil fins. If damaged during shipping and han-
dling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that condenser-fan blade are correctly posi-
tioned in fan orifice. See Condenser Fan Adjustment
section 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, GENERAL

Unit Preparation

Make sure that unit has been installed in accordance with
installation instructions and applicable codes.
In addition to the base unit start-up (unit with electro-mechani-
cal control), there are a few steps needed to properly start-up
units with optional direct digital controls (DDC). The DDC's
Service Test function should be used to assist in the base unit
start-up and also allows verification of output operation. Con-
troller configuration is also part of start-up. This is especially
important when field accessories have been added to the unit.
The factory pre-configures options installed at the factory.
There may also be additional installation steps or inspection re-
quired during the start-up process.

Additional Installation/Inspection

Inspect the field-installed accessories for proper installation,
making note of which ones do or do not require configuration
changes. Inspect the DDC Alarms for initial insight to any po-
tential issues. Refer to the Controls, Start-up, Operation and
Troubleshooting Instructions manual for the specific DDC. In-
spect the SAT sensor for relocation as intended during installa-
tion. Inspect special wiring as directed below.

Return-Air Filters

Ensure correct filters are installed in unit (see Appendix B —
Physical Data). 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

Compressors are internally spring mounted. Do not loosen or
remove compressor hold down bolts.

Internal Wiring

Check all electrical connections in unit control boxes. Tighten
as required.

Refrigerant Service Ports

Each unit system has two 1/4-in. SAE flare (with check valves)
service ports: one on the suction line, and one on the compres-
sor discharge line. Be sure that caps on the ports are tight.
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