Refrigeration Service Operations
85
5. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the low side.
6. Replace the access panels.
7. Open the refrigeration valves and place the
unit in operation.
8. Test the unit to see that the expansion valve is
properly installed.
Heat Exchanger
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the evaporator access panels.
3. Remove the hardware that holds the heat
exchanger on the bulkhead.
4. Unsolder the liquid lines.
5. Unsolder the suction inlet line.
6. Unsolder the remaining outlet suction line
connection from the condenser side of the
bulkhead. Remove any putty from around the
lines before unsoldering the connections.
7. Slide the heat exchanger assembly out of the
evaporator housing.
Installation
1. Clean the tubes for soldering.
2. Place the heat exchanger assembly in the
evaporator housing and install the mounting
hardware loosely.
3. Solder the suction outlet line connection on
the condenser side of the bulkhead. Seal the
openings through the bulkhead with putty
when the refrigerant lines have cooled off.
4. Solder the suction inlet line connection.
5. Solder the liquid line connections.
6. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the low side.
7. Tighten the heat exchanger mounting
hardware securely.
8. Replace the evaporator access panels.
9. Open the refrigeration valves and place the
unit in operation.
Evaporator Coil
NOTE: This procedure applies to the Zone 1 and
Zone 2 evaporator coils.
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the evaporator access panels and
damper assembly.
3. Disconnect and remove the sensors.
4. Remove the feeler bulb from the suction line
clamp. Note the position of the feeler bulb on
the suction line.
5. Unsolder the distributor from the expansion
valve.
6. Unsolder the hot gas line and the suction line
from the evaporator coil.
NOTE: It may be necessary to unsolder and
remove other refrigeration tubes to remove
the control box side DE evaporator coil.
7. Remove the mounting bolts, lift and slide the
coil from the housing.
1.
End View
2.
Side View
Figure 57: Location of Expansion Valve Bulb
AEA713
Summary of Contents for Spectrum DE 30-2
Page 4: ...4...
Page 12: ...Safety Precautions 12...
Page 16: ...Specifications 16...
Page 31: ...Unit Description 31 1 Access Panels 2 Defrost Dampers Figure 12 Back View of Unit 1 2 AGA215...
Page 42: ...Operating Instructions 42...
Page 48: ...Electrical Maintenance 48...
Page 106: ...Structural Maintenance 106...
Page 110: ...Mechanical Diagnosis 110...
Page 114: ...Remote Evaporator Specifications 114...
Page 116: ...Remote Evaporator Maintenance Inspection Schedule 116...
Page 122: ...Remote Evaporator Electrical Maintenance 122...
Page 126: ...Remote Evaporator Refrigeration Service Operations 126...
Page 128: ...Remote Evaporator Structural Maintenance 128...
Page 130: ...Remote Evaporator System Diagnosis 130...
Page 134: ...Wiring and Schematic Diagrams Index 134...
Page 135: ...135 Schematic Diagram Page 1 of 2...
Page 136: ...136 Schematic Diagram Page 2 of 2...
Page 137: ...137 Wiring Diagram Page 1 of 4...
Page 138: ...138 Wiring Diagram Page 2 of 4...
Page 139: ...139 Wiring Diagram Page 3 of 4...
Page 140: ...140 Wiring Diagram Page 4 of 4...