Electrical Controls And Wiring; Refrigerant Circuit; Indoor Airflow; Pressure Switches - Carrier Infinity 480CEN024 Installation Instruction

6.Ensure that setscrew engages the fiat a rea onthe motor shaft
when t ightening.
7.Replace grille.
Step
5 --Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be
sure to turn off the electrical power to the unit.
Remove access panel to locate all the electrical controls and wiring.
Check all electrical connections for tightness. Tighten all screw
connections. If any smoky or burned connections are noticed,
disassemble the connection, clean all the parts, re-strip the wire end
and reassemble the connection properly and securely.
After inspecting the electrical controls and wiring, replace all the
panels. Start the unit, and observe at least one complete cooling
cycle to ensure proper operation. If discrepancies are observed in
operating cycle, or if a suspected malfunction has occurred, check
each electrical component with the proper electrical
instrumentation. Refer to the unit wiring label when making these
checks.
Step 6--Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a
refrigerant leak.
If oil is detected or if low performance is suspected, leak test all
refrigerant tubing using an electronic leak detector, or liquid-soap
solution. If a refrigerant leak is detected, refer to Check for
Refrigerant Leaks section.
If no refrigerant leaks are found and low performance is suspected,
refer to Checking and Adjusting Refrigerant Charge section.
Step 7--Indoor Airflow
The heating and/or cooling airflow does not require checking unless
improper performance is suspected. If a problem exists, be sure that
all supply- and return-air grilles are open and free from
obstructions, and that the air filter is clean.
Step 8--Metering Devices-TXV & AccuRater Piston
This unit uses 2 types of metering devices. The outdoor metering
device is a fixed orifice and is contained in the brass- hex body in the
liquid line feeding the outdoor coils. The indoor metering device is
a TXV-type device.
Step 9--Pressure Switches
Pressure switches are protective devices wired into control circuit
(low voltage). They shut off compressor if abnormally high or low
pressures are present in the refrigeration circuit. These pressure
switches are specifically designed to operate with Puron (R-410A)
systems. R-22 pressure switches must not be used as replacements
for the Puron (R-410A) system.
Step 10--Loss-of-Charge Switch
This switch is located on the liquid line and protects against low
suction pressures caused by such events as loss of charge, low
airflow across indoor coil, dirty filters, etc. It opens on a pressure
drop at about 20 psig. If system pressure is above this. switch should
be closed. To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
NOTE: Because these switches are attached to refrigeration system
under pressure, it is not advisable to remove this device for
troubleshooting unless you are reasonably certain that a problem
exists. If switch must be removed, remove and recover all system
charge so that pressure gauges read 0 psi. Never open system
without breaking vacuum with dry nitrogen.
Step ll--High-Pressure Switch
The high-pressure switch is located in the discharge line and
protects against excessive condenser coil pressure. It opens at 650
psig.
High pressure may be caused by a dirty outdoor coil, failed fan
motor, or outdoor air recirculation.
To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
Step 12--Copeland Scroll Compressor (Puron Refrigerant)
The compressor used in this product is specifically designed to
operate with Puron (R-410A) refrigerant and cannot be
interchanged.
The compressor is an electrical (as well as mechanical) device.
Exercise extreme caution when working near compressors. Power
should be shut off. if possible, for most troubleshooting techniques.
Refrigerants present additional safety hazards.
EXPLOSION, FIRE, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death and/or property damage.
Wear safety glasses and gloves when handling refrigerants.
Keep torches and other ignition sources away from
refrigerants and oils.
The scroll compressor pumps refrigerant throughout the system by
the interaction of a stationary and an orbiting scroll. The scroll
compressor has no dynamic suction or discharge valves, and it is
more tolerant of stresses caused by debris, liquid slugging, and
flooded starts. The compressor is equipped with an anti-rotational
device and an internal pressure-relief port. The anti-rotational
device prevents the scroll from turning backwards and replaces the
need for a cycle protector. The pressure-relief port is a safety device.
designed to protect against extreme high pressure. The relief port
has an operating range between 550 and 625 psi differential
pressure.
The Copeland scroll compressor uses Mobil 3MA POE oil. This
is the only oil allowed for oil recharge.
Step 13--Refrigerant System
This step covers the refrigerant system of the 48CE, including the
compressor oil needed, servicing systems on roofs containing
synthetic materials, the filter drier, and refrigerant charging.
REFRIGERANT
PERSONAL INJURY, UNIT OPERATION HAZARD
Failure to follow this caution may result in personal injury,
equipment damage or improper operation.
This system uses Puron (R-410A) refrigerant which has
higher operating pressures than R-22 and other refrigerants.
No other refrigerant may be used in this system. Gauge set,
hoses, and recovery system must be designed to handle Puron.
If you are unsure, consult the equipment manufacturer.
COMPRESSOR OIL
The compressor in this system uses a polyolester (POE) oil, Mobil
3MA POE. This oil is extremely hygroscopic, meaning it absorbs
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