Ingersoll-Rand Thermo King V-520 MAX 30 Maintenance Manual

Refrigeration Service Operations
57
Compressor Pressure Regulator
Valve Test
1. Install a gauge manifold set on the engine
driven compressor. Attach an additional
compound gauge to the evaporator suction
service port to monitor suction pressure in the
evaporator.
2. Set the thermostat on the highest setting.
3. Start and run the unit in Heat on the engine
driven compressor until the pressure on the
additional compound gauge attached to the
evaporator suction service port stabilizes at a
pressure above 60 psig (414 kPa).
4. Check the suction pressure on the gauge
attached to the suction service port at the
compressor. It should be 50.0 ± 5 psig (345 ±
34 kPa). If the setting is incorrect, remove the
protective cap and try to adjust the compressor
pressure regulator valve to the correct setting
before assuming it is faulty.
5. Remove the gauge manifold set and the
additional compound gauge when finished
with the test.
Compressor Pressure Regulator
Valve Replacement
Removal
1. Recover the refrigerant charge.
2. Remove the mounting hardware from the
compressor pressure regulator valve.
3. Unsolder the compressor pressure regulator
valve from the accumulator.
Installation
1. Clean the tubes for soldering.
2. Place the valve in position and solder the
connection.
3. Install the mounting hardware.
4. Pressurize the system and test for leaks.
5. Evacuate and recharge the system.
Suction Bypass CPR Valve
(SPECTRUM Only)
SPECTRUM Advanced Control
System
In multi-temperature refrigeration systems the
frozen evaporator has lower suction pressure than
the fresh evaporator because temperature is
relative to pressure. If both evaporators are calling
for cool at the same time, the fresh evaporator
takes the major portion of the capacity because it
has a higher pressure to feed into the common
suction line. With multiple door openings and the
fresh compartment taking most of the capacity,
the frozen department can loose control of the
temperature and rise above the desired setpoint.
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. Evaporator Suction Service Port
2. Compressor Pressure Regulator Valve
3. Accumulator Tank
Figure 31: Accumulator Module
(Model 30 and 50 Only)
1
2
3

Ingersoll-Rand Thermo King V-520 MAX 30 Specifications

General

Brand	Ingersoll-Rand
Model	Thermo King V-520 MAX 30
Category	Air Compressor
Language	English