Thermo King – Suction Pressure Regulator Test/ Adjustment

Purpose: To check or adjust the suction pressure regulator setting.
Test & Adjustment Procedure
1. Obtain the recommended setting from current Service Bulletins or the unit Maintenance Manual.
2. Install a calibrated gauge manifold.
3. Operate the unit in cool for 5 minutes or more. Shift the unit to heat or defrost and operate for 3 to 5 minutes.
4. Read the valve’s setting on the gauge manifold’s low pressure gauge.
5. Remove the protective cap and use a hex key to turn the adjustment screw in (CW) to increase or out (CCW) to decrease the setting. Make all settings with the unit operating in heat or defrost.

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