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4.5.3 Installation of the heat pump
Ideally the heat pump should be placed next to an external wall allowing easy access to the externally
mounted ground array manifold. Any pipes internal to the building must be insulated with vapour barrier
insulation such as Armaflex. It is not recommended that the ground or header array manifold is installed
within a building due to condensation and difficulty in lagging the manifold to overcome this.
It is possible to place manifolds in underground chambers and Kensa can supply suitable chambers on
request. If an underground manifold is used all joints must be electro-fusion type.
Fig 6 Plant room heat pumps
i.
Remove the door by turning the lock with a screwdriver, opening and lifting off.
ii.
Remove the hood by unscrewing the 3 mm allen key bolts on either side of the base of the hood.
Carefully lift the hood off, which will require two people.
iii.
Place the Heat Pump's base frame into position and level it using the adjustable feet if necessary;
please tighten the locking nuts on the feet when level.
iv.
Using specialist lifting equipment, place the Heat Pump on its base frame, and tighten the fasten-
ings on the anti-vibration mounts.
v.
Ensure the heating distribution system has been thoroughly purged of any debris and any filters are
clean.
vi.
All pipe connections to the heat pump must be vibration isolated using bellows or
equivalent. Connect the ground feed & return pipes from the ground array/header manifold (which
can be connected either way round), and the feed and return pipes from the heating distribution
manifold (which must be connected the correct way round), according to the Illustration overleaf.
The reason for using flexible connections is that the heat pump is suspended on anti-vibration
mounts, so the connections must also be flexible. For multiple plant room modules the flows and
returns should be manifolded together and balanced ideally in a reverse return arrangement if
possible.
vii.
Thread the power supply and BMS wires from under the unit into the control box and connect them
to the terminals required, ( see electrical installation section ).
viii.
Check and rectify any leaks that may be in the plumbing system. It is advisable that a pressure test
is carried out to ensure the system is leak free.
ix.
The appliance should be left for 12 hours after installation before it is turned on, to allow the
refrigerant to settle. The area where the heat pump is installed must be dry and rodent free.
x.
Phone Kensa to arrange for the commissioning of the unit. Do not switch the unit on without talking
to Kensa first.
Plant Room Heat Pump Manual Version 11.1
Page 14 of 34
Fig 7 Header manifold connections
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