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Note: Before actioning any installation observe the 'Safety information' in Section 1.
It is essential that the following installation guidelines are followed carefully.
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.
Kensa plant room heat pumps do not come with any water circulating pumps for either the load or ground
side. These should be specified by the M and E consultant and will depend on site conditions.
Important
The following section includes typical schematics of how a heat pump can be connected. It is important to
note that the schematics are only general arrangements and hence do not illustrate all required valves or
fittings. System designs are also very site specific and should be provided by the M and E consultant. The
following is a guide only.
4.1 The golden rules of installing a plant room heat pump
1.
A 'D' Type MCB should be used for the heat pumps power supply.
2.
All pipe connections to the heat pump must be vibration isolated using bellows or equivalent.
3.
Use a suitably sized purge pump for purging the ground arrays and heat pump.
4.
Pipe lengths to the ground arrays should be kept equal to maintain equal flow and connected
reverse return.
5.
Flow switches should be installed to prevent operation in non-flow situations.
6.
Read this manual fully before commencing installation
4.2 Plantroom heating schematics
The key to obtaining low CO2 emissions and running costs for any heat pump is to maintain the flow
output at as low a temperature as possible. Any increase in outlet temperature will result in a drop in
efficiency and systems should be designed to reflect this.
The following schematic details how a heating system for a commercial property can be designed.
The modular design of Kensa plant room heat pumps enables the system to closely match the required
heating load. Each unit should be configured via the BMS to operate sequentially to allow part operation
to match the heat demand of the building. The multiple unit approach also offers a degree of redundancy
in the unlikely event of a problem with one if the units.
Depending on the system design it might be necessary to incorporate a buffer vessel to avoid short cycling
problems and it is recommended, to improve overall efficiency of the system, that this is a twin connec-
tion buffer vessel. The vessel should be sized for 10 litres per kW of the smallest heat pump module. For
example for a 60kW heating load using 3 x 20kW heat pumps the buffer vessel should be approx 20 x 10 =
200 litres.
Kensa heat pumps can work equally as well with horizontal, vertical or lake arrays as the energy source.
Although Slinky ground arrays are shown on the drawing, in large commercial projects it can be more usu-
al to use a borehole field design due to space considerations.
Plant Room Heat Pump Manual Version 11.1
Page 8 of 34
4. Installation
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