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7
Commissioning
7.1 FILLING AND FLUSHING THE MEGAFLO SOLAR
Ensure that all fittings and immersion heaters are correctly fitted and tightened. An immer-
sion heater key spanner is provided to aid tightening of the immersion heater backnut(s).
i)
Open a hot tap furthest from the Megaflo Solar.
ii)
Open the isolating valve on the Cold Water Combination Valve by turning the black
handle so that it lies parallel to the direction of flow. Open the mains stop cock to fill
the unit. When water issues from the tap, allow to run for a few minutes to thoroughly
flush through any residue, dirt or swarf, then close tap.
iii)
Open successive hot taps to purge any air from the system.
iv)
Check all connections for leaks and rectify as necessary.
v)
The Strainer housed within the Cold Water Combination Valve should be cleaned to
remove any debris that may have been flushed through the main supply pipe. Refer
to Section 9.3 for instructions on how to do this.
7.2 CHECK THE OPERATION OF THE SAFETY VALVES
i)
Slowly manually open, for a few seconds, the Temperature and Pressure Relief Valve
situated on the Megaflo Solar unit (see Diagram 17). Check water discharged runs
freely away through the tundish and discharge pipework. Close valve, ensure water
flow stops and valve reseats correctly.
ii)
Repeat for the Expansion Valve situated on the Cold Water Combination Valve or
Expansion Core Unit (see Diagrams 2 and 3).
7.3 SOLAR PRIMARY CIRCUIT
Fill the solar primary circuit following the instructions provided with the solar hydraulic
controls. The cylinder temperature control sensor probe supplied with the solar differential
temperature controller must be inserted into the pocket in the lower controls housing and
its cable securely clamped.
Heating by the solar primary circuit is controlled by the solar differential temperature
controller, refer to the manufacturer's installation instructions for details of how to set up
and commission the solar primary circuit. The solar controller should be programmed to
give a maximum storage temperature in the Megaflo Solar of 70
mended to minimise scaling.
7.4 IMMERSION HEATER(S)
Switch on the electrical supply to the immersion heater(s) and allow the unit to heat up.
Check that the thermostat operates correctly. A storage temperature of approx. 60
ommended (between graduations 4 and 5 on the thermostat). If necessary the temperature
can be adjusted by inserting a flat bladed screwdriver in the adjustment knob on top of the
immersion heater thermostat and rotating (see Diagram 11). The adjustment range 1 to 5
represents a temperature range of between 10
Check that no water is discharged from either the Expansion Valve or Temperature and
Pressure Relief Valve during the heating cycle.
C although 60
o
and 70
C.
o
o
C is recom-
o
C is rec-
o
23
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