24
8.1 General
8. Operation
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. 60
o
C, however it can be
set to control between 10
o
C and 70
o
C. This will
usually have been done during installation and
commissioning. Adjustments can only be made by
opening the controls covers.
`
Access to the thermostat can be made by opening
the controls housing cover - DISCONNECT THE
ELECTRICAL SUPPLY BEFORE OPENING THE
COVER(S).
`
Temperature adjustment is made by rotating the
adjustment knob on the top of the thermostat. The
adjustment represents a temperature range of
10°C to 70°C (see page 20, fig 14 for method of
adjustment).
`
Maximum working temperature is 70°C. In very
hard water areas limit to 60/65°C to minimise the
build up of limescale on the immersion heater
element surfaces.
DO NOT bypass the thermal cut-out(s) in any
circumstances.
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.
`
Water stored at temperatures in excess
of 60
o
C can scald. Consideration to
blend down water delivery temperatures
at the point of use to a safe level should
be given
`
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 - 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. 60
o
C, however it can be
set to control between 10
o
C and 70
o
C. This will
usually have been done during installation and
commissioning. Adjustments can only be made by
opening the controls covers.
`
Access to the thermostat can be made by opening
the controls housing cover - DISCONNECT THE
ELECTRICAL SUPPLY BEFORE OPENING THE
COVER(S).
`
Temperature adjustment is made by rotating the
adjustment knob on the top of the thermostat. The
adjustment represents a temperature range of
10°C to 70°C (see page 20, fig 14 for method of
adjustment).
`
Maximum working temperature is 70°C. In very
hard water areas limit to 60/65°C to minimise the
build up of limescale on the heat exchanger coil
surfaces.
`
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 the Fault Finding section (page 27) of this
book. It is recommended that faults should be checked
by a competent installer
Summary of Contents for Megaflo Eco 125DD
Page 34: ...34 Benchmark checklist...
Page 35: ...35 Commissioning service records...
Page 38: ...38 NOTES...
Page 39: ...39 NOTES...
