Technical data

14
optimise its safety, efficiency and performance.
The service engineer should complete the relevant
Service Record on the Benchmark Checklist after
each service.
The Benchmark Checklist may be required in the
event of any warranty work and as supporting
documentation relating to home improvements
in the optional documents section of the Home
Improvements Pack.
TEMPERATURE CONTROLS (Fig. 7)
The CENTERSTORE cylinder units are fitted with
an indirect thermostat and thermal cut-out. These
controls must be wired in series with the 2 port
motorised zone valve supplied to interrupt the fl ow
of primary water around the heat exchanger coil
when the control temperature has been reached.
The controls are located within the lower 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 - DISCONNECT THE ELECTRICAL
SUPPLY BEFORE OPENING THE COVER. Temperature
adjustment is made by inserting a fl at bladed screw-
driver in the adjustment knob and rotating. The
minimum thermostat setting is 10
o
C. The adjustment
range 1 to 5 represents 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.
An immersion heater is also provided for use should
the indirect heat source be shut down for any purpose.
The immersion heater control temperature is set
using the immersion heater thermostat.
DO NOT bypass the thermal cut-out(s) in any
circumstances.
FLOW PERFORMANCE
When initially opening hot outlets a small surge in
fl ow may be noticed as pressures stabilise. 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.
OPERATIONAL FAULTS
Operational faults and their possible causes are
detailed in the Fault Finding section of this book. It
is recommended that faults should be checked by
a competent installer.
The air volume within the expansion vessel will
periodically require recharging to ensure expanded
water is accommodated within the unit.
FAULT FINDING & SERVICING
IMPORTANT
• After servicing, complete the relevant
Service Interval Record section of the Bench-
mark Checklist located on page 17 and 18 of
this document.
• Servicing should only be carried out by
competent persons in the installation and
maintenance of unvented water heating
systems.
• Any spare parts used MUST be authorised
CENTERSTORE parts.
• Disconnect the electrical supply before
removing any electrical equipment covers.
• NEVER bypass any thermal controls or
operate system without the necessary
safety valves.
• Water contained in the CENTERSTORE cylinder
may be very hot, especially following a thermal
control failure. Caution must be taken when
drawing water from the unit.
SPARE PARTS
A full range of spare parts are available for the
CENTERSTORE cylinder range (See Table 4). Refer
to the technical data label on the unit to identify
the model installed and ensure the correct part is
ordered. You will need to quote the serial number
and the guarantee code, which are printed on the
data label.
FAULT FINDING
The fault fi nding chart on page 16 will enable
operational faults to be identifi ed and their pos-
sible causes rectifi ed. Any work carried out on the
CENTERSTORE cylinder unvented water heater and
its associated controls MUST be carried out by a
competent installer for unvented water heating
systems. In case of doubt contact service support
(see contact details on back page).
WARNING
DO NOT TAMPER WITH ANY OF THE SAFETY VALVES
OR CONTROLS SUPPLIED WITH THE CENTERSTORE
CYLINDER AS THIS WILL INVALIDATE ANY GUARANTEE
A discharge of water INTERMITTENTLY from the
expansion valve will indicate the air volume has
reduced to a point where it can no longer accom-
modate the expansion.