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3 The system can also be shut down for the off-season. If the system is to be shutdown for an
extended period of time, all automatic drain valves should be removed and the system
completely flushed. Then all water remaining in the lines should be air purged. The supply
water to the pump module should be turned off. Empty filter housings of any remaining
water and replace filter cartridges with new dry cartridges. Turn off electrical power to the
pump module. This will protect against corrosion and damage to the pump and lines.
Stainless steel pumps should not be inactive for more than 2 weeks without following the above
shutdown procedure.
Decommissioning / Freeze Protecting
If the system is to be decommissioned (shut-down for an extended period of time), or stored in a
cold area, the following procedure is applicable:
1 Disconnect the low pressure line at the inlet of the pump.
2 Connect the pump inlet to a canister containing a mixture of 35% glycol and water.
3 Disconnect the high pressure supply line at the inlet to the valve block.
4 Run the pump briefly to circulate the glycol mixture through the pump and supply lines.
5 Reconnect the high pressure supply lines to the valve block.
6 Disconnect the glycol canister and cap the pump inlet.
7 Decommission the RO system as per manufactures instructions (if applicable).
Inlet Water Pressure Switch
The inlet water pressure switch is hydraulically actuated, and completes a 24Vac control circuit.
The switch is rated to 150 psi, and cut off sensitivity is adjustable between 12 and 100 psi.
This switch is preset at 20 psi at the factory and does not require adjustment.
45 | HP Series Installation Manual
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