18
Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil
accumulation annually. Detecting oil generally indicates a
refrigerant leak.
EXPLOSION, SAFETY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal
injury, death or equipment damage.
This system uses R--410A refrigerant which has higher
operating pressures than R--22 and other refrigerant. No
other refrigerant may be used in this system. Gauge set,
hoses, and recovery system must be designed to handle
R--410A. If you are unsure, consult the equipment
manufacturer.
!
WARNING
If oil is detected or if low cooling performance is suspected, leak
test all refrigerant tubing using an electronic leak detector, halide
torch 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 cooling performance is
suspected, refer to Checking and Adjusting Refrigerant Charge
section.
Indoor Airflow
The 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.
Metering Devices
Refrigerant cooling metering device is a piston (024--048) or TXV
(060) located upstream of the indoor coil distributor assembly.
High Flow Valves
High flow valves are located on the compressor hot gas and suction
tubes. Large black plastic caps distinguish these valves with
O--rings located inside the caps. Ensure the plastic caps are in place
and tight or the possibility of refrigerant leakage could occur. To
replace valve core without removing charge, service tool p/n
SCFT20A is required.
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 (4482 kPA). High pressure may be caused by a dirty
condenser coil, failed fan motor, or condenser air recirculation.
To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohmmeter leads across switch. You should have
continuity on a good switch.
R--410A Compressor
The compressor used in this product is specifically designed to
operate with 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 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.
!
WARNING
Compressors vary in type by unit size. See Table 8 below for
compressor type by size.
Table 8 – Compressor Type
UNIT
COMPRESSOR
TYPE
MANUFACTURER SUGGESTED
OIL TYPE
024
Bristol Recip
Hatcol 32BCE Polyolester (POE)
030
Bristol Recip
Hatcol 32BCE Polyolester (POE)
036
Bristol Recip
Hatcol 32BCE Polyolester (POE)
042
Bristol Recip
Hatcol 32BCE Polyolester (POE)
048
Copeland Scroll
3MAF Polyolester Oil (POE)
060
Danfoss Scroll
Polyvinyl Ether Oil (PVE)
All compressors in these units have internal overload protection.
This protection will interrupt motor current under fault conditions
such as running current overload. The Copeland Scroll
compressors also have internal pressure relief that will relieve from
the high side to the low side if the differential is excessive.
Refrigerant
EXPLOSION,
ENVIRONMENTAL
SAFETY
HAZARD
Failure to follow this warning could result in personal
injury, death or equipment damage.
This system uses 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
R--410A. If you are unsure, consult the equipment
manufacturer.
WARNING
!
This system uses 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 R--410A. If you are unsure, consult the
equipment manufacturer. Failure to use R--410A compatible
servicing equipment or replacement components may result in
property damage or injury.
Compressor Oil
Use only manufacturer suggested compressor oil, see Table 8 for
correct oil.
NOTE
: Alternate manufacturer approved compressor oil for 048
unit with Copeland Scroll compressor: Uniqema RL32--3MAF,
Copeland Ultra 32 CC, Mobil Arctic EAL22 CC, ICI Emkarate
RL22 or ICI Emkarate 32CF.
This oil is extremely hygroscopic, meaning it absorbs water
readily. POE/PVE oils can absorb 15 times as much water as other
oils designed for HCFC and CFC refrigerants. Take all necessary
precautions to avoid exposure of the oil to the atmosphere.
PA
3Z
B
