![background image](http://html.mh-extra.com/html/thermo-king/spectrum-ts-30-sr-nad/spectrum-ts-30-sr-nad_manual_1104394134.webp)
Refrigeration Maintenance
134
2. Set the sepoints in all zones well below the
zone temperatures so that all zones will be in
High Speed Cool.
3. Raise the discharge pressure of the
compressor by blocking the condenser coil air
flow by covering the roadside condenser grille
with a piece of cardboard.
NOTE: The discharge pressure should never
be allowed to exceed a pressure of 470 psig
(3241 kPa) on R-404A systems.
4. Failure of the HPCO system to stop
compressor operation should be investigated
first by checking the control circuit operation
and secondly by HPCO switch replacement.
Low Side Pump Down
NOTE: Operate the unit with all zones in COOL
for 2 to 5 minutes before performing the low side
pump down.
1. Unplug the hot gas bypass solenoid.
2. Install a gauge manifold to the suction service
valve and the discharge service port. A low
loss fitting must be used on the hose
connected to the discharge service port.
3. Operate the unit with all zones in low speed
cool.
4. Front seat the receiver tank outlet valve and
allow the low side to pump down to 0 to 5 in.
Hg vacuum (0 to -17 kPa).
5. Turn the unit Off.
6. Prepare to perform service on the low side by
equalizing the high side and low side
pressures through the gauge manifold.
7. Equalize low side pressure to 1 to 2 psig (7 to
14 kPa).
NOTE: Repeat the pump down procedure if
the pressures equalize above 20 psig
(138 kPa). If acceptable low pressures
cannot be achieved after the third pump
down, the refrigerant must be recovered to
perform service on the low side.
NOTE: Valve stem MUST be back seated
during normal unit operation.
8. Plug in the hot gas bypass solenoid.
9. Open the receiver tank return outlet valve,
remove the gauges and return the unit to
normal operation.
Discharge Pressure Regulator
Valve
This unit is equipped with a discharge pressure
regulator valve, which is located in the hot gas
line between the hot gas valves and the discharge
line. The discharge pressure regulator valve
maintains the compressor discharge pressure at
340 to 400 psig (2344 to 2758 kPa) during heat
and defrost operation. These higher discharge
pressures create higher discharge temperatures,
resulting in enhanced heating capabilities.
Figure 161: Discharge Pressure Regulator
The compressor discharge pressure is regulated by
a spring and bellows. This valve is pre-set at the
factory to maintain the compressor discharge
pressure at 340 to 400 psig (2344 to 2758 kPa)
during heat and defrost operation. This valve
should not require any adjustment.
CAUTION: Do not pull scroll compressor
into a deep vacuum to perform routine
maintenance procedures.
CAUTION: Do not run scroll compressor
in a vacuum for more than 1 minute.
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 ...