180R9289 | AQ109686503106en-001102 | 5
© Danfoss | 2023.01
Operation guide
Installation, Operation and Maintenance Manual for PAHT 256-308 pumps
1.1 General
The PAHT pumps and pump units are manufac-
tured by Danfoss A/S, and are sold and marketed
by a net of authorized distributors world wide.
This manual contains the necessary instructions
for the installation, operation and service of the
pumps used for technical water.
In case the pump delivered is ATEX certified, the
additional ATEX instruction must also be read.
The PAHT pumps must not be used for other pur-
poses than those recommended and specified
without first consulting your local pump
distributor.
Use of the pump in other applications not
suitable for the pump unit can cause damages to
the pump unit, with risk of personal injury.
All personnel being responsible for operation
and maintenance of the pump unit must read
and fully understand these instructions,
especially the section “Safety”, before:
• Transportation of the pump unit
• Lifting the unit
• Installing the pump unit
• Connecting the pump unit to the water
system
• Connecting the electric motor and instru-
mentation
• Commissioning the unit
• Servicing the motor pump unit, mechanical
and electrical parts
• Decommissioning the motor pump unit
The pump must always be installed and used in
accordance with existing national/local
sanitary, safety regulations and laws.
It is the responsibility of the safety officer or the
chief operator to assure compliance with all
local regulations that are not taken into
account in this manual.
Changing the pumps’ or pump units’ opera-
tional limits and hardware:
• Changes to the delivered pump or motor
pump system may only be done with a
written approval from Danfoss High Pressure
Pumps.
• Operation outside the Danfoss specifications
requires a written approval from Danfoss
High Pressure Pumps.
• If any changes are made without written
approval the warranty will automatically
become void.
It is important that these instructions are
always available to the personnel concerned.
1.2 Symbols
Indicates something to be noted by the
reader
Indicates a situation which will or could
result in damage to the pump and its
function
Indicates a situation which will or could
result in personal injury and/or damage
to the pump
Electrical hazard - Indicates a high-
voltage warning
Safety glasses required
Hearing protection required
Safety shoes required
Safety helmet required
!
Protective
garments
must be worn
Protective garments
must be worn
Danger HOT.
Do not touch
Electrical
hazard
Electrical hazard
1. Introduction
