Starting Up And Shutting Down PHEs

Starting up:

1. Inspect the unit carefully for integrity.

2. After extended storage or time off-line, ensure that the approach piping is free of scale or contamination that may clog the fluid passages.

3. Make sure that all inlet and outlet connections are tight.

4. Always establish the cold side flow first, then the hot side flow.

5. Make sure the cold side inlet valve between the pump and unit is closed.

6. Fully open the shut-off valve at the outlet (if one was installed).

7. Open the vent valve to evacuate air.

8. Start the pump.

9. Slowly open the feed valve. Close the vent valve when all air has been removed.

10. Wait several minutes, then repeat Steps 5–9 for the hot side, taking approximately 5 min. to fully open the inlet valve.

Shutting down:

Always decrease the flow to the hot side until closed. Then shut down the cold side flow.

1. Slowly close the hot side inlet valves.

2. Switch off the pump.

3. Close the outlet valves.

4. Drain and vent the unit.

5. Repeat Steps 1–4 for the cold side.