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8
User Instructions
8.1 WARNINGS
IF WATER ISSUES FROM THE TEMPERATURE/PRESSURE RELIEF VALVE ON THE
MEGAFLO SOLAR UNIT REFER TO SECTION 8.4 FIRST. IF THIS DOES NOT RECTIFY
THE FAULT SWITCH OFF ELECTRICAL SUPPLY TO THE IMMERSION HEATER(S)
(DIRECT UNITS), SHUT DOWN THE BOILER ON THE AUXILIARY HEATING (INDIRECT)
CIRCUIT OR SHUT DOWN THE SOLAR PRIMARY CIRCUIT. 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 MEGAFLO
SOLAR SYSTEM, IF A FAULT IS SUSPECTED CONTACT A COMPETENT INSTALLER.
8.2 TEMPERATURE CONTROL
SOLAR PRIMARY CIRCUIT
Temperature control when heating by the solar primary circuit will be controlled by the ex-
ternal solar differential temperature controller. The controller should be set to give a water
storage temperature of approx. 60
usually have been done during installation. A maximum of 70
nuisance operation of the thermal cut-outs fitted to the unit. Adjustment is made at the solar
differential temperature controller, refer to the manufacturer's instructions for details of how
to make any adjustments.
Changes to the operating temperature differential set points can affect the efficiency of the
operation of the solar heating circuit, it is recommended that any changes made are carried
out by a competent solar water heating installation engineer.
IMMERSION HEATERS
A combined thermostat and thermal cut-out is provided for each immersion heater. The
thermostat is factory set to give a water storage temperature of approx. 60
it can be set to control between 10
installation. Adjustments can only be made by opening the terminal cover(s), DO NOT
remove the cover(s) without first switching off the electrical supply. The temperature adjust-
ment is made by inserting a flat bladed screwdriver in the slot in the disc on top of the
thermostat and rotating (see Diagram 11).
If in any doubt consult a competent electrician.
AUXILIARY HEATING COIL
Indirect units (CL models) are fitted with an Indirect Thermostat which controls a 2-port
motorised valve and hence the temperature of the water in the Megaflo Solar unit when
heated using the auxiliary heating coil. The thermostat is factory set to give a water
storage temperature of approx. 60
70
C, this will usually have been done during installation. Adjustments can only be made
o
by opening the terminal cover. DO NOT remove the cover without first switching off the
C, however it can be set to other temperatures. This will
o
C and 70
C. This will usually have been done during
o
o
C, however it can be set to control between 10
o
C is recommended to avoid
o
C, however
o
C and
o
25
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