Grundfos PHT-F250 - Float Valve and Pump Priming; Float Valve Adjustment (PHT-F;T); Pump and System Priming

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GRUNDFOS INSTRUCTIONS
8.2 PHT-F/T unit – Float valve adjustment.
Fig. 10 PHT-F/T – Float valve level adjustment
8.3 Priming of the Pumps and System.
All PHT-D/F/T/V pumps must be primed before the PHT unit is switched ON.
Permanent damage can occur from dry running the pumps.
To Prime:
 Loosen the priming screw(s) located on the pump housing, system manifold(s) until water
flows through the priming screw.
 Tighten the priming screw back up.
 Dry off any water.
Fig. 11 – PHT-*25 and PHT-*50 Models Fig. 12 – PHT-*80 Model
Fig. 13 System priming
Priming Screws
Locations
Set the ball float valve to its lowest
position on the valve arm.
Allow the tank to fill from the mains
water supply and check that the stop fill
level does not exceed the Overflow and
sit just below the Overflow.
Adjust as necessary.