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8. Operation
8.1 General
WARNING
If water discharges from the Temperature
`
& Pressure relief valve on the cylinder
shut down the heat source and/or switch
off the immersion heater(s). DO NOT
turn off the water supply. Contact a
competent installer for unvented water
heaters to check the system.
DO NOT tamper with any of the safety
`
valves fitted to the system. If a fault is
suspected contact a competent installer.
Disconnect from the mains electrical
`
supply before removing any covers.
DO NOT bypass the thermal cut-out(s)
`
in any circumstances.
All electrical wiring should be carried
`
out by a competent electrician and be in
accordance with the latest I.E.E Wiring
Regulations.
Temperature controls – direct units immersion
heater(s)
A combined thermostat and thermal cut-out is
`
provided for each immersion heater fitted. The
thermostat is factory set to give a water storage
temperature of approx. 57
to control between 10
To access the thermostat open the controls housing
`
cover (see Fig. 10, page 19) - DISCONNECT THE
ELECTRICAL SUPPLY BEFORE OPENING THE
COVER(S).
Temperature adjustment is made by rotating the
`
adjustment spindle on the top of the thermostat.
The adjustment represents a temperature range of
10°C to 70°C (Fig. 12, see page 20 for method of
adjustment).
Maximum working temperature is 70°C.
`
DO NOT bypass the thermal cut-out(s) in any
circumstances.
Temperature controls - indirect units
A combined thermostat and thermal cut-out is
`
provided for the control of the external boiler. The
thermostat is factory set to give a water storage
temperature of approx. 57
to control between 10
can only be made by opening the controls covers.
To access the thermostat open the controls housing
`
cover see Fig. 10, page 19
WARNING
DISCONNECT THE ELECTRICAL
`
SUPPLY BEFORE OPENING THE
COVER(S).
24
C, however it can be set
o
C and 70
C.
o
o
C, however it can be set
o
C and 70
C. Adjustments
o
o
Temperature adjustment is made by rotating the
`
adjustment spindle on the top of the thermostat.
The adjustment represents a temperature range of
10°C to 70°C (see Fig. 12, page 20 for method of
adjustment).
Maximum working temperature is 70°C.
`
The boiler thermostat and thermal cut-out must
`
be wired in series with the 2 port motorised zone
valve supplied to interrupt the flow of primary water
around the heat exchanger coil when the control
temperature has been reached.
The controls fitted to the cylinder will affect the
`
temperature of the stored water only, other
controls will be provided in the system for time
and temperature control of the space heating
requirements. Consult the instructions provided
with those controls for details of adjustments.
DO NOT bypass the thermal cut-out(s) in any
circumstances.
Flow performance
When initially opening hot outlets a small surge in
flow 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 section 10. Troubleshooting, page 27 of
this manual. It is recommended that faults should be
checked by a competent installer.
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