Pre- -Start- -Up; Start- -Up; Check For Refrigerant Leaks; Start- -Up Cooling Section And Making Adjustments - Carrier PAD4 E Series Installation Instructions Manual

PRE- -START- -UP

WARNING
!
ENVIRONMENTAL,
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death and/or property damage.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Relieve and recover all refrigerant from system before
touching or disturbing compressor plug if refrigerant
leak is suspected around compressor terminals.
3. Never attempt to repair soldered connection while
refrigerant system is under pressure.
4. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
5. To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install
lockout tag.
b. Relieve and reclaim all refrigerant from system
using both high- - and low- -pressure ports.
c. Cut component connecting 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 (see Fig. 19).
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 damages, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect all field- - and factory- -wiring connections. Be
sure that connections are completed and tight.
c. Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
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 condensate drain pan and trap are filled
with water to ensure proper drainage.
b. Make sure that all tools and miscellaneous loose parts
have been removed.
14
FIRE, EXPLOSION,
Specifications are subject to change without notice.
START- - UP
Step 1 — Check for Refrigerant Leaks
WARNING
!
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors.
mixtures of air or gases containing
oxygen can lead to an explosion.
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 repair.
3. Add a small charge of R- -410A refrigerant vapor to system
and leak- -test unit.
4. Recover refrigerant from system and evacuate to 500
microns if no additional leaks are found.
5. Charge unit with R- -410A refrigerant, using an accurate
scale. Refer to unit rating plate for required charge.
Step 2 — Start- -Up Cooling Section And Make
Adjustments
Complete the required procedures given in the Pre- -Start- -Up
section before starting the unit. Do not jumper any safety devices
when operating the unit. Do not operate the unit when the outdoor
temperature is below 40F (4C) (unless accessory low- -ambient
kit is installed). Do not rapid cycle the compressor. Allow 5
minutes between "on" cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION

Start and check the unit for proper cooling control operation as
follows:
1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is
placed in ON position and shuts down when FAN switch is
placed in AUTO position.
2. Place SYSTEM switch in COOL position and FAN switch
in AUTO position. Set cooling control below room
temperature. Observe that compressor, condenser fan, and
evaporator blower motors start. Observe that compressor
and outdoor fan shut down when control setting is satisfied
and that indoor blower shuts down after 90 second fan time
delay expires.
IMPORTANT: Three- -phase, scroll compressors are direction
oriented. Unit must be checked to ensure proper compressor
3- -phase power lead orientation. If not corrected within 5 minutes,
the internal protector will shut off the compressor. The 3- -phase
power leads to the unit must be reversed to correct rotation. When
turning backwards, the difference between compressor suction and
discharge pressures may be minimal.
CHECKING AND ADJUSTING REFRIGERANT
CHARGE
The refrigerant system is fully charged with R- -410A refrigerant
and is tested and factory sealed.
Pressurized
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