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Installation
When installing with ASHP see
Instruction 7841138
Heat Pump Control - see Heat Pump manual
The Heat Pump (HP) should have a thermal control
to monitor the temperature in the cylinder. One
control is acceptable but two are recommended.
Also employ a method to connect to the cylinder so
that in the event of the cylinder thermal cut-out being
activated the HP and any internal backup heaters/
additional heat sources will shut down.
Safety
DISCONNECT FROM THE MAINS ELECTRICAL
SUPPLY BEFORE REMOVING ANY COVERS.
Never attempt to replace the immersion heater other
than with the authorised spare part.
DO NOT BYPASS THE THERMAL CUT-OUT(S) IN
ANY CIRCUMSTANCES. Ensure the two male spade
terminations from the dual thermostat and cut-out are
pushed firmly onto the corresponding terminations on
the immersion heater.
In case of difficulty contact service support - see details
on the back page of this manual.
Electrical Supply
All electrical wiring should be carried out by a
competent electrician and be in accordance with the
latest I.E.E Wiring Regulations.
Each circuit must be protected by a suitable fuse
and double pole isolating switch with a contact
separation of at least 3 mm in both poles.
The boost immersion heater should be wired in
accordance with Fig. 7, opposite. The immersion
heater MUST be earthed. The supply cable should
be 1.5 mm
3 core HO5 VV-F sheathed and must be
2
routed through the cable grip provided with the outer
sheath of the cable firmly secured by tightening the
screws on the cable grip.
DO NOT operate the immersion heaters until the
cylinder has been filled with water.
Ensure the thermostat and thermal cut-out sensing bulbs
are pushed fully into the pockets on the element plate
assembly.
It is recommended that wires are terminated with a
bootlace-type ferrule.
12
Plumbing Connections
ASHP cylinders require the following
pipework connections:
•
Cold water supply to and from inlet controls.
•
Outlet to hot water draw off points.
•
Discharge pipework from valve outlets to tundish.
•
Connection to the heat pump circuit.
All connections are 22 mm compression. However,
3/4" BSP parallel threaded fittings can be fitted to the
primary coil connections if required.
Primary Circuit Control
The 3 port motorised valve supplied with the cylinder
MUST be fitted on the primary flow to the cylinder heat
exchanger (coil) and wired back to the HP control.
Primary circulation to the cylinder heat exchanger (coil)
must be pumped; gravity circulation WILL NOT WORK.
Space and Heating Systems Controls
Consult Heat Pump User Instructions on how to set up
space heating requirements.
Wiring schematics when installing
cylinder without ASHP
Earth
Neutral
Direct Wiring Layout
N
L
1.5 mm
3 Core
2
HO5 VV-F sheathed
cable
Fig. 7: Wiring Schematics
Fused Spur
Live
Immersion Heater
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