Shoebox Heat Pump Manual Version 9.4
Page 8 of 40
4. Installation
Note: Before actioning any installation observe the 'Safety information' in Section 1.
It is essential that the following installation guidelines are followed carefully.
The installation must conform to all relevant construction and electrical codes and comply with the
requirements of the Microgeneration Certification Scheme (MCS) MIS3005
’
Requirements for Contractors
undertaking the Supply, Design, Installation, Set to Work Commissioning and Handover of Microgeneration
Heat Pump Systems
’
Any electrical work required to install or maintain this appliance should be carried out by a suitably qual-
ified electrician in accordance with current IEE regulations.
Any plumbing work should be carried out to local water authority and WRC regulations.
4.1 The Golden Rules of Installing a Shoebox Heat Pump
1.
Connect the heat pump using only plastic pipe or flexible piping.
2.
Ensure a load side water pump is fitted externally to the heat pump and sized correctly.
3.
Use the Kensa recommended purge pump for purging the ground arrays and heat pump.
4.
On the underfloor heating manifold(s), remove the thermal mixing valve(s) if fitted.
5.
On the underfloor heating manifold(s), don
’
t fit electric actuators to more than 75% of the zones,
unless a buffer vessel is fitted to each shoebox.
6.
Remove the chrome screw on the water pump, and check that the pump is running, and moving
water before turning on the compressor (See section 6.3).
7.
Read this manual fully before commencing installation
8.
Do not connect the heat pump to a thermal store without consulting Kensa first.
9.
An electrical isolation switch should be fitted close to the heat pump.
10.
Existing heating systems should be power flushed and inhibitors should be added.
11.
Ideally use a type C breaker, however a type B is acceptable.
4.2 Underfloor Heating Schematics
The following section includes typical schematics of how a heat pump can be connected. Only the load
side is shown i.e. the heating distribution system. It is important to note that the schematics are only
general arrangements and hence do not illustrate all required valves or fittings.
On the underfloor heating manifold(s) remove any thermal mixing valves, if fitted.
To avoid the heat pump from short cycling, it is important that a correctly sized buffer vessel is used. The
buffer vessel should be sized so it is capable of accepting the minimum load from the heat pump. The use
of a buffer vessel enables a fully controlled zone system to be used.
Alternatively if a fully controlled zone system is not required and the heating system is capable of
absorbing the heat produced during the minimum heat pump runtime, the use of a buffer vessel is not
required.
The easiest way to do this is simply to have some zones left
“
open
”
–
i.e. without electric actuators. These
zones will still require room thermostats so can call for heat when required. In houses, the best zones to
chose are ensuite bathrooms, and hallways, neither of which are likely to be overheated.
To avoid short cycling of the heat pump the smallest actuator controlled zone (plus all the open zones on
that manifold) should be capable of absorbing the minimum thermal load of the heat pump. This
minimum load is approximately 25% .
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