Pre-Start-Up/Start-Up; Start-Up, General; Unit Preparation; Additional Installation/Inspection - Carrier 48GC 04-06 Series 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 applicable
lockout/tag-out procedures.
b. Recover refrigerant to relieve all pressure from sys-
tem 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, 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 bro-
ken 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 refriger-
ant 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 connections.
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 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 sec-
tion 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 installa-
tion 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.

Gas Piping

Check gas piping for leaks.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, serious
personal injury and/or property damage.
Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig (3450 Pa). Pressures greater than
0.5 psig will cause gas valve damage resulting in hazardous
condition. If gas valve is subjected to pressure greater than
0.5 psig, it must be replaced before use. When pressure testing
field-supplied gas piping at pressures of 0.5 psig or less, a unit
connected to such piping must be isolated by closing the
manual gas valve(s).
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WARNING