Refrigeration Service Operations
125
Liquid Line Check Valve
Removal
1. Remove the refrigerant charge.
2. Unsolder the lines and remove the check
valve.
NOTE: Disassemble valve before unsoldering.
Installation
1. Clean the tubes for soldering.
2. Place the disassembled check valve in
position. Arrow on the valve body indicates
the direction of refrigerant flow through the
valve.
3. Solder the inlet and outlet connections. After
the valve cools, reassemble the valve.
4. Pressurize the refrigeration system and test for
leaks.
5. If no leaks are found, evacuate the system.
6. Recharge the unit with refrigerant and check
the compressor oil.
Dehydrator (Filter-Drier)
Removal
1. Pump down the refrigeration system and
equalize the pressure to slightly positive.
2. Disconnect the nuts at the end of the drier.
3. Loosen the mounting hardware and remove
the drier.
Installation
1. Install the new drier and tighten the mounting
screws and nuts. Install new o-rings.
2. Install and tighten the inlet nut to the receiver
tank outlet valve line (inlet end of drier is
labeled “IN”). Hold the drier with a back-up
wrench on the hex behind the flare fitting.
3. Release a small amount of refrigerant to purge
the air through the drier. Then tighten outlet
nut on the dehydrator to the evaporator line.
4. Pressurize the system and inspect for leaks. If
no leaks are found, open the refrigeration
valves and place the unit in operation.
Evaporator Coil
Removal
1. Remove the refrigerant charge.
2. Remove the evaporator top panel.
3. Disconnect the expansion valve from the
distributor. Disconnect the air switch hoses.
4. Unsolder the suction line and drain pan hot
gas line from the evaporator coil.
5. Disconnect the electric heaters and high
temperature cutout switch on Model 50 units.
6. Remove the mounting bolts and slide the coil
from the evaporator housing.
Installation
1. Place the evaporator coil in the housing.
2. Install the mounting bolts and tighten.
3. Clean the tubes for soldering.
4. Solder the suction line and drain pan hot gas
line connections to the evaporator coil.
5. Connect the distributor to the expansion valve
assembly.
6. Connect the air switch hoses and install the
high temperature cutout switch and electric
heaters (Model 50).
7. Pressurize the low side and test for leaks. If no
leaks are found, evacuate the unit.
8. Open the refrigeration valves and place the
unit in operation. Install the refrigerant charge
and compressor oil and add as required.
Expansion Valve Assembly
Removal
1. Pump down the low side and equalize pressure
to slightly positive.
Summary of Contents for 914970
Page 3: ...3...
Page 10: ...Table of Contents 10...
Page 40: ...Operating Instructions 40...
Page 82: ...Electronic Controls 82...
Page 92: ...Electrical Maintenance 92...
Page 124: ...Refrigeration Maintenance 124...
Page 140: ...Hilliard Clutch Maintenance 140...
Page 160: ...Refrigeration Diagrams 160...
Page 163: ...Index 163 W wiring 85 wiring diagrams 165...
Page 164: ...Index 164...
Page 166: ...Wiring and Schematic Diagrams Index 166...
Page 167: ...167 Cab Control RD Wiring Diagram...
Page 168: ...168 RD w o Thermostat Cab Control Schematic...
Page 169: ...169 RD Cab Box Wiring Diagram...
Page 170: ...170 RD Cab Control w Thermostat Schematic Diagram...
Page 171: ...171 RD 50 STD 3 Phase Wiring Diagram Page 1 of 2...
Page 172: ...172 RD 50 STD 3 Phase Wiring Diagram Page 2 of 2...
Page 173: ...173 RD 50 STD 3 Phase Schematic Diagram Page 1 of 2...
Page 174: ...174 RD 50 STD 3 Phase Schematic Diagram Page 2 of 2...
Page 175: ...175 RD 30 STD Wiring Diagram Page 1 of 2...
Page 176: ...176 RD 30 STD Wiring Diagram Page 2 of 2...
Page 177: ...177 RD 30 STD Schematic Diagram Page 1 of 2...
Page 178: ...178 RD 30 STD Schematic Diagram Page 2 of 2...
Page 179: ...179 RD 30 C S Wiring Diagram Page 1 of 2...
Page 180: ...180 RD 30 C S Wiring Diagram Page 2 of 2...
Page 181: ...181 RD w CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 182: ...182 RD w CYCLE SENTRY Schematic Diagram Page 2 of 2...
Page 183: ...183 RD 50 C S 3 Phase Wiring Diagram Page 1 of 2...
Page 184: ...184 RD 50 C S 3 Phase Wiring Diagram Page 2 of 2...
Page 185: ...185 RD w CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 186: ...186 RD w CYCLE SENTRY Schematic Diagram Page 2 of 2...