9
4.0 INSTALLATION - DIRECT
UNITS
4.1 PLUMBING CONNECTIONS
Direct units require the following pipework connec-
tions.
•
Cold water supply to and from inlet controls.
•
Outlet to hot water draw off points.
•
Discharge pipework from valve outlets to tundish.
4.2 ELECTRICAL SUPPLY (FIG. 6)
The Heatstore HSUDC100 litre units are fitted with
one 3kW immersion heater, all other direct models are
fitted with two 3kW immersion heaters as standard. It
is recommended that these should be wired via a suit-
able controller to BSEN 60730.
The Heatstore HSU
MUST be earthed.
The 250 and 300 litre units have an
additional boss which has a blanking plug fitted. An
additional immersion heater can be fitted in place of
the blanking plug where a higher electrical input is
required for faster recovery times, order Part No. 95
970 510 if required.
All wiring to the unit must be installed in accordance
with the latest IEE Wiring Regulations and the circuit
must be protected by a suitable fuse and double pole
isolating switch with a contact separation of at least
3mm in both poles. The Live and Neutral connections
are made directly onto the combined thermostat and
thermal cut-out located under the terminal cover(s)
mounted on the side of the unit. The Earth connection
should be made to the earth connection located to
the side of the immersion heater boss(es). The supply
cable must be routed through the cable gland located
on the unit casing beneath the terminal housing.
DO NOT
operate the immersion heaters until the
Heatstore HSU has been filled with water.
4.3 SAFETY
DISCONNECT FROM THE MAINS SUPPLY
BEFORE REMOVING ANY COVERS.
Never attempt to replace the immersion heater(s) other
than with the recommended Heatstore HSU immersion
heater(s).
DO NOT
BYPASS THE THERMAL CUT-OUT(S) IN
ANY CIRCUMSTANCES
. Ensure the two male spade
terminations on the underside of the combined
thermostat and thermal cut-out are pushed firmly onto
the corresponding terminations on the element plate
assembly.
In case of difficulty contact Heatstore, tel: 0117 923
5375.
5.0 INSTALLATION - INDIRECT
UNITS
5.1 PLUMBING CONNECTIONS
Indirect units require the following pipework connec-
tions.
•
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 primary circuit.
Primary connections are 22mm compression. However,
3/4”BSP parallel threaded fittings can be fitted to the
primary coil connections if required.
5.2 ELECTRICAL SUPPLY (FIG. 6)
All Indirect units are fitted with a 3kW immersion
heater and a combined thermostat and thermal cut-
out to control the indirect heating source.
The
Heatstore HSU MUST be earthed.
All wiring to the unit must be installed in accordance
with the latest IEE Wiring Regulations and the supply
circuits must be protected by a suitable fuse and double
pole isolating switch with a contact separation of at
least 3mm in both poles. All connections are made to
the terminal block located under the terminal cover
mounted on the side of the unit. The supply cable(s)
must be routed through the cable grip(s) in the terminal
housing.
DISCONNECT FROM MAINS SUPPLY BE-
FORE REMOVING ANY COVERS. DO NOT
BY-
PASS THE THERMAL CUT-OUTS IN ANY CIRCUM-
STANCES.
Ensure the thermostat and thermal cut-
out sensing bulbs are pushed fully into the pockets
on the element plate assembly.
5.3 BOILER SELECTION
The boiler should have a control thermostat and non
self-resetting thermal cut-out and be compatible with
unvented storage water heaters.
5.4 PRIMARY CIRCUIT CONTROL
The 2 port motorised valve supplied with the Heatstore
HSUIC indirect units MUST be fitted to the primary
flow to the Heatstore HSU heat exchanger and wired
in series with the indirect thermostat and thermal cut-
out fitted to the unit.
Primary circulation to the Heatstore HSU heat ex-
changer MUST be pumped, gravity circulation WILL
NOT WORK due to the special design of the heat
exchanger.
5.5 SPACE AND HEATING SYSTEMS CONTROLS
The controls provided with the Heatstore HSU indi-
rect units will ensure the safe operation of the unit
within a central heating system. Other controls will be
necessary to control the space heating requirements
and times that the system is required to function. The
Heatstore HSU is compatible with most heating con-
trols, examples of electrical circuits are shown in Figs.
7 and 8. However, other systems may be suitable, refer
to the controls manufacturers’ instructions, supplied
with the controls selected, for alternative system wir-
ing schemes.
