2
Please read and understand these instructions prior to installing your Heatstore
unvented water heater. Particular attention should be paid to the section headed
IMPORTANT INSTALLATION POINTS
. Following installation and commissioning
the operation of the heater should be explained to the customer and these instructions
left with them for future reference.
TECHNICAL SPECIFICATIONS
Electrical rating .................................................... 2.75kW @ 230V
..................................................... 3kW @ 240V
Capacities ............................................................. 10 or 15 litres
Weight (full) ......................................................... 10 litre - 16.4 kg
............................................................................. 15 litre - 23.1 kg
Rated pressure ..................................................... 6 bar (0.6 MPa)
Minimum recommended supply pressure ............ 0.8 bar (0.08 MPa)
Temperature/Pressure Relief Valve ....................... 90
o
C/7 bar
1.0 IMPORTANT INSTALLATION POINTS
1.1
This unvented water heater MUST be fitted with a Pressure Relief Valve. The
factory fitted Temperature/Pressure Relief Valve can fulfill this function.
FAILURE
TO PROVIDE ADEQUATE PRESSURE RELIEF WILL INVALIDATE ANY
GUARANTEE AND LEAD TO A DANGEROUS INSTALLATION
1.2
Expansion can take place within the cold water supply
PROVIDED THAT BOTH
:
(a) Backflow in the main is not prevented by any stopvalve with loose jumper,
check valve, pressure reducing valve or similar,
AND
(b) Hot water expansion
does not
enter a branch to a cold water outlet (see
Figure 1 for expansion pipe lengths).
N.B. Both the above conditions must be met. Additionally expansion within the cold
water supply will not be possible if the static supply pressure exceeds 4.1 bar
(60p.s.i.).
1.3
If any of the conditions in 1.2 above cannot be met expansion must be
accomodated using an Expansion Vessel. To ensure all expansion takes place in
the vessel Non Return Valve
must
also be fitted together with a Pressure
(expansion) Relief Valve (see Figure 2). Use Accessory Pack B.
1.4
If the static supply pressure exceeds 4.1 bar (60p.s.i.) a Pressure Reducing Valve
must be fitted to the cold main supply. If a Pressure Reducing Valve is used an
Expansion Vessel must also be used (see Figure 3). Use Accesory Packs A and B.
