GRUNDFOS INSTRUCTIONS
22
8.0 Installation and commissioning – General.
The PHT A unit has been designed to minimize and simplify the number of installation and
commissioning activities required to bring the system on line.
All mechanical connections should be carried out by a by a qualified and authorised
person in accordance with this manual and the latest codes of practice.
Do not attempt to start the pump even to check the direction of rotation until the system
has been filled with water and both the pump(s) and the system have been primed/vented.
Running the pump dry may permanently damage it. This will not be covered by warranty.
See the Pump Priming section.
Do not remove the controller enclosures, controller components, motor terminal box
cover, electrical cables or any other electrical protective covering without first ensuring
that the electrical supply is suitably isolated and cannot be switched back on.
Do not attempt to supply electricity to the PHT A unit and run the pump electric motor
without ensuring that all electrical fittings, cables and enclosures are intact and suitably
electrically isolated from human touch during operation.
Do not attempt to supply electricity to the electric motor or re-pressure the pipe work
system without first ensuring that all protective coverings are held securely in their
correct positions.
The PHT A unit and any expansion vessel should be connected on the system
return. Non-return valves and RPZ valves should not be connected between the PHT A
unit and the system.
It is strongly recommended that all PHT A units are connected to a lockable isolator or
fused spur that is readily accessible.
- Backup fuse/MCB protection should be sized at 20 Amps
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