33
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. Gage set, hoses, and
recovery system must be designed to handle Puron. If you are
unsure, consult the equipment manufacturer. Failure to use Puron
compatible servicing equipment or replacement components may
result in property damage or injury.
Compressor Oil
The Copeland scroll compressor uses 3MAF POE oil. If additional
oil is needed, use Uniqema RL32--3MAF. If this oil is not
available, use Copeland Ultra 32 CC or Mobil Arctic EAL22 CC.
This oil is extremely hygroscopic, meaning it absorbs water
readily. POE oils can absorb 15 times as much water as other oils
designed to HCFC and CFC refrigerants. Take all necessary
precautions to avoid exposure of the oil to the atmosphere.
Servicing Systems on Roofs with Synthetic Materials
POE (polyolester) compressor lubricants are known to cause long
term damage to some synthetic roofing materials. Exposure, even if
immediately cleaned up, may cause embrittlement (leading to
cracking) to occur in one year or more. When performing any
service that may risk exposure of compressor oil to the roof, take
appropriate precautions to protect roofing. Procedures which risk
oil leakage include, but are not limited to, compressor replacement,
repairing refrigerant leaks, replacing refrigerant components such
as filter drier, pressure switch, metering device, coil, accumulator,
or reversing valve.
Synthetic Roof Precautionary Procedure
1. Cover extended roof working area with an impermeable
polyethylene (plastic) drip cloth or tarp. Cover an
approximate 10x10 ft (3x3 m) area.
2. Cover area in front of the unit service panel with a terry
cloth shop towel to absorb lubricant spills and prevent
run--offs, and protect drop cloth from tears caused by tools
or components.
3. Place terry cloth shop towel inside unit immediately under
component(s) to be serviced and prevent lubricant run--offs
through the louvered openings in the unit base.
4. Perform required service.
5. Remove and dispose of any oil contaminated material per
local codes.
Liquid Line Filter Drier
The biflow filter drier is specifically designed to operate with
Puron. Use only factory--authorized components. Filter drier must
be replaced whenever the refrigerant system is opened. When
removing a filter drier, use a tubing cutter to cut the drier from the
system. Do not unsweat a filter drier from the system. Heat from
unsweating will release moisture and contaminants from drier into
system.
Puron (R--410A) Refrigerant Charging
Refer to unit information plate and charging chart. Some R--410A
refrigerant cylinders contain a dip tube to allow liquid refrigerant to
flow from cylinder in upright position. For cylinders equipped
with a dip tube, charge Puron units with cylinder in upright
position and a commercial metering device in manifold hose.
Charge refrigerant into suction--line.
Step 13 — System Information
Loss of Charge Switch
The loss of charge switch is a protective device wired into control
circuit (low voltage). It shuts off the compressor if abnormally low
pressures are present in the refrigeration circuit.
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 psig. Never open system
without breaking vacuum with dry nitrogen.
Check Defrost Thermostat
The defrost thermostat is usually located on the lowest liquid
leaving circuit of the left condenser coil (see Fig. 23). The
thermostat closes at 32
_
F (0
_
C) and opens at 65
_
F (18
_
C).
The defrost thermostat signals heat pump that conditions are right
for defrost or that conditions have changed to terminate defrost. It
is a thermally actuated switch clamped to outdoor coil to sense its
temperature. Normal temperature range is closed at 32
_
3
_
F (0
1.7
_
C) and open at 65
_
5
_
F (18
2.8
_
C).
NOTE
: The defrost thermostat must be located on the liquid side
of the outdoor coil on the bottom circuit and as close to the coil as
possible. The factor location is on the left/back coil.
FEEDER TUBE
STUB TUBE
DEFROST
THERMOSTAT
C99029
Fig. 23 -- Defrost Thermostat
TROUBLESHOOTING
Refer to the Cooling and Heating Troubleshooting Chart (Table
11) for troubleshooting information.
START--UP CHECKLIST
Use the Start--Up Checklist.
50V
T
--
C
Summary of Contents for Comfort 50VT C Series
Page 3: ...3 Fig 2 24 30 Unit Dimensions 50VT C...
Page 4: ...4 Fig 3 36 60 Unit Dimensions 50VT C...
Page 11: ...11 A150518 Fig 12 Connection Wiring Schematics 208 230 1 60 50VT C...
Page 12: ...12 A150519 Fig 12 Cont Ladder Wiring Schematics 208 230 1 60 50VT C...
Page 13: ...13 A150520 Fig 13 Connection Wiring Schematics 208 230 3 60 50VT C...
Page 14: ...14 A150521 Fig 13 Cont Ladder Wiring Schematics 208 230 3 60 50VT C...
Page 15: ...15 A150522 Fig 14 Connection Wiring Diagram 460 3 60 50VT C...
Page 16: ...16 A150523 Fig 14 Cont Ladder Wiring Diagram 460 3 60 50VT C...
