Refrigeration Maintenance
132
3. Open both service manifold hand valves.
4. Set all zones to run in Low Speed Cool
through the HMI Service Test Mode. Refer to
the SPECTRUM TS Microprocessor
Diagnostic Manual (TK 51652) for
information about the Service Test Mode.
5. Front seat the receiver tank outlet valve.
6. Run the unit until a 3 to 5 psig [21 to 35 kPa]
reading is obtained on the suction gauge, then
stop the unit.
7. Back seat the suction service valve and the
receiver tank outlet valve.
8. Remove all remaining hoses.
9. Install and tighten the service port and valve
stem caps.
10. Unit is ready for a functional check out.
Refrigerant Leaks
Use a reliable leak detector (e.g., electronic
detector) to leak test the refrigeration system.
Inspect for signs of oil leakage which is the first
sign of a leak in the refrigeration system.
NOTE: It is normal for compressor shaft seals to
have a slightly oily film.
Refrigerant Charge
Testing the Refrigerant Charge with
an Empty Box
If the unit has an insufficient charge of refrigerant,
the evaporator will be “starved” and the box
temperature will rise even though the unit is
operating. The suction pressure will drop as the
refrigerant charge decreases. The charge may be
determined by inspection of the refrigerant
through the receiver tank sight glass with the
following conditions established:
1. Place a test box over the evaporator in each
zone to separate the zones.
2. Install a gauge manifold.
3. Set all zones to run in High Speed Cool
through the HMI Service Test Mode. Refer to
the SPECTRUM TS Microprocessor
Diagnostic Manual (TK 51652) for
information about the Service Test Mode.
4. Run the unit with all zones in high speed cool
until the air in the box in each zone indicates
0 F (-18 C). By allowing a box to leak a small
amount, you will be able to maintain 0 F
(-18 C).
5. The discharge or head pressure gauge should
read 290 to 310 psig (1999 to 2137 kPa).
If the pressure is below this, it can be raised by
covering a portion of the condenser coil with a
piece of cardboard.
6. The compound gauge should be indicating 12
to 20 psig (83 to 138 kPa) gauge pressure.
If there is any doubt about the unit gauge,
check the calibration.
7. Under these conditions, the ball in the receiver
tank sight glass should be floating. If there is
no indication of refrigerant in the receiver tank
sight glass, the unit is low on refrigerant.
Testing the Refrigerant Charge with
a Loaded Box
1. Install a gauge manifold (optional).
2. Run the unit with all zones on the Cool cycle.
3. Cover at least three quarters of the condenser
to drive any excess refrigerant from the
condenser into the receiver tank.
4. As the head pressure is rising, check the
receiver tank sight glass. The ball should be
floating. If there is no indication of refrigerant
in the receiver tank sight glass, the unit is low
on refrigerant.
NOTE: If the ball floats, there is sufficient
refrigerant in the unit for that load at that
particular box temperature. This test does
not determine if the unit contains a full
charge of refrigerant.
Summary of Contents for SPECTRUM TS 30 SR NAD
Page 4: ...4 ...
Page 10: ...Table of Contents 10 ...
Page 20: ...Safety Precautions 20 ...
Page 51: ...Unit Description 51 Figure 19 Front View Figure 20 Back View AJA1350 AJA1500 ...
Page 52: ...Unit Description 52 1 On Off Switch Figure 21 Side View 1 ...
Page 60: ...Unit Description 60 ...
Page 80: ...SPECTRUM TS Operation 80 ...
Page 90: ...Electrical Maintenance 90 ...
Page 100: ...Engine Maintenance 100 Figure 130 Early TK 3 95 Fuel and Oil System Components ...
Page 102: ...Engine Maintenance 102 Figure 131 Late TK 3 95 Fuel and Oil System Components ...
Page 104: ...Engine Maintenance 104 Figure 132 TK376 Fuel and Oil System Components ...
Page 136: ...Refrigeration Maintenance 136 ...
Page 156: ...Hilliard Clutch Maintenance 156 ...
Page 158: ...Structural Maintenance 158 ...
Page 168: ...Remote Evaporator Specifications 168 ...
Page 170: ...Remote Evaporator Maintenance Inspection Schedule 170 ...
Page 176: ...Remote Evaporator Electrical Maintenance 176 ...
Page 180: ...Remote Evaporator Refrigeration Service Operations 180 ...
Page 182: ...Remote Evaporator Structural Maintenance 182 ...
Page 184: ...Remote Evaporator System Diagnosis 184 ...
Page 188: ...Wiring and Schematic Diagrams Index 188 ...
Page 189: ...189 Wiring Diagram Page 1 of 4 ...
Page 190: ...190 Wiring Diagram Page 2 of 4 ...
Page 191: ...191 Wiring Diagram Page 3 of 4 ...
Page 192: ...192 Wiring Diagram Page 4 of 4 ...
Page 193: ...193 Schematic Diagram Page 1 of 3 ...
Page 194: ...194 Schematic Diagram Page 2 of 3 ...
Page 195: ...195 Schematic Diagram Page 3 of 3 ...
Page 196: ...196 ...