180R9289 | AQ109686503106en-001102 | 47
© Danfoss | 2023.01
Operation guide
Installation, Operation and Maintenance Manual for PAHT 256-308 pumps
1.
Mount the coupling flush or maximum
1mm offset from the pump shaft end.
Ensure an air gap between coupling and
pump flange of min. 4 mm (0.16 in).
2.
Mount the bell housing on pump. Secure
nuts with the right torque.
3.
Measure the longest distance “A” from top
of bell housing to the button of coupling
claw.
4.
Mount the coupling on motor shaft. Ensure
the coupling and motor flange are not in
contact with each other.
5.
Measure from motor flange to the top of
the coupling. That measurement “B” shall
be 3-5 mm (0.12 - 0.2 inch) shorter than the
measurement “A”.
6.
Adjust respectively, verify the measure-
ment, and secure both couplings with the
right torques on the locking screws (see
coupling operation & mounting instruc-
tion).
7.
Mount the elastic gear ring and mount the
bell housing/pump on the motor. After
mounting it must be possible to move the
elastic gear ring 3-5mm (0.12 - 0.2 in) axial
“C”. The check can be done through the
inspection hole of bell housing. Secure
flange bolts with the right torque.
If alternative mounting is desired, please contact
the Danfoss Sales Organization.
Choose proper tolerances to ensure an easy
mounting of the elastic coupling without use of
tools.
Please take care to observe the recommended
length tolerances of the chosen coupling, as an
axial force on the pump will damage the pump.
3.2 Direction of rotation
Is indicated by means of an arrow on the pump
label.
3.3 Orientation
The pump can be mounted/orientated in any
horizontal direction with the inlet and the outlet
pointing upwards, downwards or to either side.
B
A
C
PUMP
Type PAHT 256
Code no. 180BXXXX
Serial no. XXXXXX03-XXX
MADE IN DENMARK
Danfoss A/S, 6430 Nordborg, Denmark
Instruction
