Pht A-F/T Unit - Float Valve Adjustment; Priming The Pumps; Pth-V Glycol Settings - Grundfos PHT A N Installation And Operating Instructions Manual

8.2 PHT A-F/T unit – Float valve adjustment.
Fig. 10 PHT A-F/T – Float valve level adjustment
8.3 Priming of the Pumps.
All PHT A-D/F/T/V pumps must be primed before the PHT A 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 – Priming screw location PHT A-*25, *50 and *80 Models

8.4 PTH-V Glycol settings.

The PHT A-V unit is factory set to dose Glycol @ 20 %, Water @ 80%.
This can be adjusted according to the below table.
Maximum recommended Glycol dose is 40 %.
Glycol Concentration
5 %
10 %
15 %
20 %
25 %
30 %
35 %
40 %
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Optimise the position of the ball float on the float valve
arm to achieve the optimum amount of water in the
breaktank according to the site conditions.
NOTE
Water should not exit through the overflow!
Glycol valve setting
0.20
0.35
0.55
0.70
0.90
1.05
1.25
1.40
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GRUNDFOS INSTRUCTIONS
Water valve setting
3.30
3.15
2.95
2.80
2.60
2.45
2.25
2.10