Initial Start-Up; Operation; Water Quality; Temperature - Danfoss PAHT Operation, Installation, And Maintenance Manual

Operation guide
4.

Initial start-up

5.

Operation

© Danfoss | 2023.12
Installation, Operation and Maintenance Manual for PAHT 20-90 pumps
Thread, ISO
Max tighten torque
* Recommended torque values refer to steel washers containing a rubber sealing element.
Before start-up, loosen the top bleeding plug
"C". When water appears from the bleeding plug,
retighten the plug.
The piping/hose between inlet filter and pump
must be flushed prior to initial start up of the
pump to ensure that impurities are removed.
WARNING!
Make sure that the direction of
rotation of the electric motor
corresponds to the direction of
rotation of the pump.
5.1

Water quality

Water of drinking water quality, confirming to
the EEC directive 98/83/EC and without abrasive
sediments, demineralized water, de-ionised
water, softened water and RO water.
Please contact Danfoss High Pressure Pumps
sales organization in case of doubt.
5.2

Temperature

Fluid temperature:
Min. +3° C / 37,4° F to max. +50° C / 122° F
Ambient temperature:
Min. 0° C / 32° F to max. 50° C / 122° F
Storage temperature:
Min. -40° C / -40° F to max. +70° C / 158° F
PAHT 50/63/70/80/90
Outlet (O) Inlet (I)
1" BSPP with 1 ½" BSPP with
24 mm long thread 24 mm long thread
120 Nm* 180 Nm*
(89 lb(f)ft) (133 lb(f)ft)
In
Out
To protect the pump from too high fluid
temperature, a temperature switch of 50° C
(122° F) should be mounted on the inlet side. If
the whole pump flow is bypassed over the relief
valve, then the fluid tempe-rature will go up
relatively fast.
Bleeding (C) Gauge 1/4" ports
M6 (width 1/4" BSPP with
across at = 5mm) 15 mm long thread
4 Nm* 15 Nm*
(3 lb(f)ft) (11 lb(f)ft)
C
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