TK 54343-18-MM-EN
97
Discharge Check Valve Replacement
Removal
1. Recover the refrigerant charge.
2. Remove the condenser grille.
3. Place a heat sink on the check valve.
4. Unsolder the lines and remove the check valve.
Installation
NNoottee:: A heat sink must be used on the in-line check valve when it is being soldered in place to prevent damage to the
neoprene seal.
1. Clean the tubes for soldering.
2. Place the check valve in position. The arrow on the valve body indicates the direction of refrigerant flow through the
valve.
3. Place a heat sink on the check valve.
4. Solder the inlet and outlet connections.
5. Pressurize the system and test for leaks.
6. Reinstall the condenser grille.
7. Evacuate and recharge the system.
Suction Pressure Regulator Valve (Model 20 and 50 Only)
Model 20 and 50 units are equipped with a suction pressure regulator valve. The suction pressure regulator valve is
used to limit the load on the electric standby compressor. This also affects the current draw of the compressor motor. If
the suction pressure gets too high, it can cause the thermal motor protector to open. Monitor the current drawn of the
compressor motor when making this adjustment and keep it at least 1.5 amps below the Full Load (Amps) rating for the
compressor motor (see the Specifications chapter).
Suction Pressure Regulator Valve Test
1. Install a gauge manifold set on the electric standby compressor. Attach an additional compound gauge to the
suction service port on the engine driven compressor to monitor suction pressure at the inlet to the suction pressure
regulator.
2. Connect the unit power receptacle to an appropriate electric power source.
3. Place a jumper wire between the 12 and CHB wires at the defrost termination switch to ensure the unit will run in
Defrost.
4. Start the unit and run it in Defrost on the electric standby compressor until the pressure on the additional compound
gauge attached to the suction service port stabilizes at a pressure above 45 psig (310 kPa).
5. Remove the gauge manifold set, the additional compound gauge, and the jumper wire when finished with the test.
Suction Pressure Regulator Valve Replacement
Removal
1. Recover the refrigerant charge.
2. Remove the mounting hardware from the suction pressure regulator valve.
3. Unsolder the suction pressure regulator valve from the suction tubes.
Installation
1. Clean the tubes for soldering.
2. Place the valve in position and solder the connections.
3. Install the mounting hardware.
4. Pressurize the refrigeration system and test for leaks.
5. If no leaks are found, evacuate the system.
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