3 siting the heat pump, Siting the heat pump – Grant Products HPAW155 User Manual

Page 11

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Siting the Heat Pump


3 Siting the Heat Pump

1. Base

The heat pump should be installed
on a flat trowelled finished concrete
base 150mm thick. This base
should extend at least 100mm
beyond the unit on three sides. The
edge of the concrete base on the
side closest to the building should
be flush with that face of the heat
pump. Refer to Figure 3-1.

To avoid bridging the DPC, leave a
gap of at least 300mm between the
concrete base and the wall of the

The Underside of the heat pump is
fitted with a condensate deflector
that directs the condensate to the
rear of the unit. To allow this
condensate to safely drain away,
there should be a shallow trench at
least 150mm wide, filled with stone
chippings, along the rear edge of
the concrete base. This trench can
extend across the gap between the
concrete base and the house
(minimum distance 300mm) but the
chippings must be below the
building DPC level.

3.1 Position


Figure 3-1: Installation details



200mm min above

ground level



Trench with chippings

Edge of base

flush with rear of

heat pump

Concrete base



It is essential that the condensate is able to drain
away and not allowed to run onto any adjacent
paths or driveways where, in winter, this will result
in icing and a potential hazard for anyone walking
near the heat pump.

The top of the concrete base must be either level with,
or above, the surrounding ground level. Always ensure
at least 200mm vertical clearance between the
surrounding ground level and the underside of the
heat pump to allow for adequate air movement. Refer
to Figure 3-1 for details.

2. Clearances

The Heat pump should have a
minimum of 300mm from the rear
of the unit to any wall and not have
any obstruction within 1000mm
from the front or either side of the
unit. Do not rest objects on top or
against any part of the heat pump
under any circumstances. Do not
insert objects into the fan guard.

3. Noise Level

All heat pumps make a noise.
Discuss the potential nuisance
factor with the end-user when
considering the final position of the
heat pump. Take opening windows
and doors into account. It is not
essential for the heat pump to be
positioned next to a wall of the
house. Behind an out-building may
be more suitable so discuss the
options with the end-user.

4. Insulation

Remember, all pipe work,
irrespective of length, must be well
insulated to prevent heat loss. The
use of barrier plastic pipe together
with double thick insulation is
strongly recommended, particularly
when considering longer pipe runs.

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