Pre Mounting Checklist, Based On Danfoss Preferred System Designs; Lifting And Positioning; Mount The Di Erent Equipment; Electrics - Danfoss PAHT Operation, Installation, And Maintenance Manual

Operation guide
© Danfoss | 2023.12
Installation, Operation and Maintenance Manual for PAHT 20-90 pumps

5.6 Pre mounting checklist, based on Danfoss preferred system designs

Table 1: Check points when assembling and commissioning system
Check points
Ensure that the environmental conditions are safe.
CP1
Minimum and maximum start-up temperature for uid and
CP2
pump.
Filtration condition (10µm absolute (β
CP3
Power supply for electric motor and VFD.
CP4
Safety circuit / breaker must be sized for the motor and
CP5
environment (corrosion and humidity)
Bolts and screws must conform to environmental conditions
CP6
as well as uid and torque requirements.
Instrumentation, pressure switch should be designed to
CP7
conform to the environment (corrosion and humidity).
Check the factory settings of the safety/relief valves or
CP8
pressure relief valves (1).
Check the settings of the pressure transmitter/switch (2) set
CP9
at min. inlet pressure.
Check that all pressure indicators (PI) are selected to be able
CP10
to measure the system pressure range.
Check coupling distance ( air gab – movement of the spider )
CP11
Check correct connections on the pump ( in & outlet)
CP12
Check piping for possible air gaps.
CP13

5.7 Lifting and positioning

Lift the pump unit onto base (Remember
vibration dampers, if needed). Fasten the motor
to the base.
See also chapter 4, Arrival inspection, transporta-
tion, handling, lifting and storage.

5.8 Mount the di erent equipment

(connections, pipes, tubes, check and safety/relief
valves, etc.)
• The hard piping and exible hoses used must
be of proper design and must be installed in
accordance with the manufacturer's recom-
mendations.
• Misalignment of the hard pipes may give
unintended stress on the pump port
connection and may damage the pump.
• Prevent excessive external pipe load.
• Do not connect piping by applying external
force (use of wrenches, crane, etc.) Piping
must be aligned without residual stress.
• Do not mount expansion joints so that their
force applies internal pressure on the pump

connections.

Comment
See Arrival inspection,
transportation, handling,
lifting and storage, chapter 4.
See Data sheet or Instruction,
appendices 1 and 2.
≥ 5000) See Danfoss requirements in
10
Data sheet and Instruction,
appendices 1 and 2
See Data sheet for the used
motor and VFD.
See Data sheet for the used
safety circuit.
See Data sheet for the used
equipment.
See Data sheets for the used
valves.
See Data sheet or Instruction,
appendices 1 and 2.
Scaling should at least be 1 Bar
or more precise.
3 – 5 mm

5.9 Electrics

All electrical installation work must be carried out
by authorized personnel in accordance with
EN60204-1 and/or local regulations. (see also
Safety, chapter 2)
Turn o the safety circuit breaker and lock it.
Mount the power cable on the electric motor.
If a VFD is used, adjust the protective motor
switch/VFD to the current limits found on name
plate of the electric motor.

5.10 Instrumentation

The pressure switch/sensor should be mounted
as close to the pump as possible. It is recom-
mended to test the pressure/sensor switch via an
instrumentation manifold.
Mount the pressure switch/sensors according to
the manufacturer's instructions.
5.11 Connections
Mount and tighten connections and check
valve(s) as speci ed.
180R9288_AQ109686503100en-001301 | 11
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