TK 56612-18-IM-EN
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CPR Valve Settings — SPECTRUM Multi-Temperature Systems
SPECTRUM Multi-Temperature units are equipped with a Compressor Pressure Regulator (CPR) valve located in the
Advanced Control System Module mounted on the back of the evaporator. The advanced control system balances the
suction pressure between the fresh and frozen evaporators to allow both evaporators to have equal capacity to control
the two zones. This system gives priority to the frozen section. It also keeps refrigerant from migrating into the frozen
evaporator when it is not running.
1. Install a gauge manifold set on the engine driven compressor.
2. Shut off the fresh compartment by raising its setpoint to the highest setting.
3. Start the unit on the engine driven compressor at 1800 to 2000 RPM.
4. Bring the frozen compartment to 5 to 7 F (3 to 4 C) above desired setpoint. Record the suction pressure and then
shut the unit off.
5. Remove the suction bypass solenoid coil and install a magnet (P/N 204-1074) to close valve.
6. Raise the frozen compartment setpoint to the highest level on the HMI and lower the fresh compartment setpoint to
35 F (2 C) and start the unit.
7. With the unit running, set the suction pressure to the recorded value from step 4 by adjusting the suction bypass
CPR valve. Once the suction pressure has been set, turn the unit off.
8. Remove magnet and reinstall the coil on the suction bypass solenoid.
9. Remove the gauge manifold set.
10. Start the unit with both compartments set to desired setpoints and let the unit pull down.
11. It is normal for the frozen compartment to pull down faster than the fresh compartment on first start up.
Summary of Contents for V-520 RT Series
Page 32: ...32 TK 56612 18 IM EN E El le ec ct tr ri ic ca al l C Co on nn ne ec ct ti io on ns s ...
Page 42: ...42 TK 56612 18 IM EN Component Dimensions and Weights Figure 1 ES500 EVAPORATORS ...
Page 54: ...54 TK 56612 18 IM EN N No ot te es s ...