Discharge Pressure Regulator (DPR) Adjustment Procedures - MAX WARNING Equipment Damage! Lower settings can be selected based on local preferences to optimize heating operation. HIGHER valve settings than specified will lead to system malfunction including operation interruption when box is warm (motor overcurrent conflict with inverter limits). The DPR setting is factory set, however, the below procedure can be used to check the setting in the case of any doubt. Note: The measurement of the High Pressure > 6 bar (87 psig) does not necessarily mean that the DPR is set > 6 bar (87 psig).
To get a more precise measurement of the DPR setting follow the procedure below in the exact order that it is listed: 1. Cool down the box to -20є C (-4є F). 2. Change operation to heating mode. 3. Attach a gauge manifold to the suction service port (1) and the discharge service port (2). A low loss fitting must be used on the hose connected to the discharge service port. (See illustration below). 4. Operate the unit in high speed heat until the system pressures stabilize. 5. Check High Pressure with the gauges as follows: a. Check the discharge pressure on the gauge attached to the discharge service port. b.
A pressure of >= to 6 bar (87 psig) is required for the DPR to function, however It should be within a range of 6 bar (87 psig) to 10 bar (145 psig) and no higher. c. If the setting is incorrect, remove the protective cap and try to adjust the DPR (3) to the correct setting. 6. Remove the gauges to return the unit to normal operation. 34 TK 56881-18-IM-EN