Purpose: To accurately check the pressure setting of mechanical throttling valves.
Test Procedure
1. Obtain the recommended setting from current Service Bulletins or the unit Maintenance Manual.
2. Install a calibrated gauge manifold.
3. Install a calibrated compound gauge on the base of the throttling valve.
4. Operate the unit in cool for 5 minutes or more.
5. Shift the unit to heat or defrost.
6. Observe the compound gauge and the gauge manifold’s low pressure gauge.
7. When the gauge manifold’s low pressure gauge reads approximately 40 psig or above, the compound gauge installed on the valve base should read within 10% of the recommended setting.
