3M ScaleGard HP, Installation And Operation Instructions Manual

14

Lock Nut/set screw

Operating Pressure
Gauge

Pressure Relief Valve

Pre-Filter

Blend Valve Line

Shroud

Bypass Plug (PN-6217402)

Operating Pressure Adjustment Instructions

1.  Turn off / unplug the ScaleGard

™

 HP Reverse Osmosis Unit.

2.  Remove the shroud from the unit. (See diagram)

3.  Open the pressure relief valve on the left side of the manifold to relieve the water pressure in the manifold (See diagram). If the water 

continues to fl ow out of the pressure relief valve, the inlet water solenoid needs to be serviced. Right gauge (tank gauge) will not lose pressure.

4.  Remove the prefi lter cartridge from the left cartridge head on the manifold. (See diagram)

5.  Install bypass plug (3M part # 6217402) into the left hand cartridge head on the manifold. (Note: Operating pressure can't be set/adjusted with 

used pre-fi lter cartridges)

6.  Close the pressure relief valve.

7.   Close the shut off valve in the blend valve line (see diagram).

8.  Remove the pressure adjustment lock nut on the water pump to access the set screw (see diagram).

9.  Turn on / plug in the SGHP RO unit.

10. Reading the left hand gauge on the unit, use the set screw to adjust the operating pressure to 115 psi +/- 5 psi and not to exceed 120 psi.

11. Turn the set screw in to increase the pressure, out to decrease the pressure. Note: A small amount of water may leak around the set screw, 

this is normal.

  To reduce the risk associated with property damage due to water leakage or fl ooding:

Notice:

 Take care when using pliers or pipe wrenches to tighten plastic fi ttings, as damage may occur if over tightening occurs.

12. When the operating pressure is set, replace the lock nut and recheck the operating pressure, readjust if necessary. (Do not over tighten lock 

nut). Check for water leaks, repair as necessary.

13. Turn off / unplug the SGHP RO unit.

14. Open the pressure relief valve on the left side of the manifold to relieve the manifold water pressure.

15. Remove the bypass plug and reinstall the pre fi lter cartridge.

16. Close the pressure relief valve.

17. Open the blend valve line shut off valve.

18. Replace the shroud on the unit.

19. Turn on / plug in the SGHP RO unit  Note: if the operating pressure is lower than the adjusted pressure, DO NOT READJUST. The reduced 

pressure is due to a restriction in the prefi lter cartridge. It is recommended to change the prefi lter cartridge.
Important: If pressure drops below 80 psi with prefi lter installed, Pre-Filter 

MUST

 be replaced.

3. ERROR SHUT DOWN

 If the fl ow switch stays open (no fl ow) after the 4th repeat the unit will shut down in “ERROR SHUT DOWN”. 

1. 

The motor / pump shut down 

2. 

5 second delay inlet solenoid valve closes

3. 

ERROR light on solid red. 

4. 

Unit will have to manually be restarted.

The unit can/will be reset back to normal operation during the toggle mode by:

1.  Unplugging the unit or pressing the reset button on the top of the PLC box

2.  Unit cycles off on full tank