15
9.0 USER INSTRUCTIONS
9.1 WARNINGS
IF WATER ISSUES FROM THE TEMPERATURE/
PRESSURE RELIEF VALVE ON THE HEATSTORE
HSU SWITCH OFF ELECTRICAL SUPPLY TO THE
IMMERSION HEATER(S) (DIRECT UNITS) OR
SHUT DOWN THE BOILER (INDIRECT UNITS). DO
NOT TURN OFF ANY WATER SUPPLY. CONTACT
A COMPETENT INSTALLER FOR UNVENTED WA-
TER HEATERS TO CHECK THE SYSTEM.
DO NOT TAMPER WITH ANY OF THE SAFETY
VALVES FITTED TO THE HEATSTORE HSU SYS-
TEM. IF A FAULT IS SUSPECTED CONTACT A
COMPETENT INSTALLER.
9.2 TEMPERATURE CONTROLS – DIRECT UNIT
IMMERSION HEATER(S)
A combined adjustable thermostat and thermal cut-
out is provided for each immersion heater. The ther-
mostat is factory set to give a water storage tempera-
ture of approx. 55
o
to 60
o
C. Access to the thermostat
can be made by opening the immersion heater cover -
DISCONNECT THE ELECTRICAL SUPPLY BEFORE
OPENING THE COVER(S). Temperature adjustment is
made by inserting a flat bladed screwdriver in the slot
on the adjustment disc on top of the thermostat and
rotating. The adjustment range 1 to 5 represents a
temperature range of 10
o
to 70
o
C (60
o
C will be approxi-
mately position 4). If in any doubt contact a compe-
tent electrician.
DO NOT bypass the thermal cut-out(s) in any cir-
cumstances.
9.3 TEMPERATURE CONTROLS – INDIRECT
UNITS (Fig. 9)
The Heatstore HSU Indirect units are fitted with an
Indirect Thermostat and Thermal Cut-out. These con-
trols must be wired in series with the 2 port motorised
zone valve supplied to interupt the flow of primary
water around the heat exchanger coil when the con-
trol temperature has been reached. The controls are
located within the lower grey terminal housing along
with the immersion heater thermostat. The thermostat
is factory set to give a water storage temperature of
approx. 55
o
to 60
o
C. Access to the thermostat can be
made by opening the terminal housing cover - DIS-
CONNECT THE ELECTRICAL SUPPLY BEFORE
OPENING THE COVER. Temperature adjustment is
made by inserting a flat bladed screwdriver in the ad-
justment knob and rotating. The minimum thermostat
setting is 10
o
C. The adjustment range 1 to 5 repre-
sents a temperature range of 30
o
to 70
o
C (60
o
C will be
approximately position 4). If in any doubt contact a
competent electrician.
On indirect units an immersion heater is also provided
for use should the indirect heat source be shut down
for any purpose. The immersion heater control tem-
perature is set using the same adjustment knob as
that for the indirect heat source.
DO NOT bypass the thermal cut-out(s) in any cir-
cumstances.
9.4 FLOW PERFORMANCE
When initially opening hot outlets a small surge in
flow may be noticed as pressures stabilize. This is
quite normal with unvented systems. In some areas
cloudiness may be noticed in the hot water. This is
due to aeration of the water, is quite normal and will
quickly clear.
9.5 OPERATIONAL FAULTS
Operational faults and their possible causes are de-
tailed in Section 8.0. It is recommended that faults
should be checked by a competent installer.
The air volume within the expansion vessel will peri-
odically require recharging to ensure expanded water
is accommodated within the unit. A discharge of water
INTERMITTENTLY
from the Expansion Valve will in-
dicate the air volume has reduced to a point where it
can no longer accommodate the expansion.
