180R9288_AQ109686503100en-001301 | 51
© Danfoss | 2023.12
Operation guide
Installation, Operation and Maintenance Manual for PAHT 20-90 pumps
5. Operation
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
4.
Initial start-up
PAHT 50/63/70/80/90
Outlet (O)
Inlet (I)
Bleeding (C)
Gauge 1/4” ports
Thread, ISO
1” BSPP with
24 mm long thread
1 ½” BSPP with
24 mm long thread
M6 (width
across flat = 5mm)
1/4” BSPP with
15 mm long thread
Max tighten torque
120 Nm*
(89 lb(f)ft)
180 Nm*
(133 lb(f)ft)
4 Nm*
(3 lb(f)ft)
15 Nm*
(11 lb(f)ft)
*
Recommended torque values refer to steel washers containing a rubber sealing element.
In
Out
C
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.
WARNING!
Make sure that the direction of
rotation of the electric motor
corresponds to the direction of
rotation of the pump.
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.
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
