Heatrae Sadia Megaflo Eco Solar Series Product Manual page 25

Commissioning
Filling and flushing the MEGAFLO Eco Solar
Ensure that all fittings and immersion heaters are correctly fitted and tightened. An immersion heater key spanner is provided to aid in tightening
the immersion heater(s).
i) Open a hot tap furthest from the MEGAFLO Eco Solar.
ii) Open the isolating valve on the 3 Bar Pressure Reducing Valve by turning the blue handle on the stop cock (if fitted in this position) 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 3 Bar Pressure Reducing Valve should be cleaned to remove any debris that may have been flushed through the
main supply pipe. Refer to Section 3, (p. 28) for instructions on how to do this.
WARNING: If the installation is to be left unused following installation and commissioning, e.g.
unoccupied properties, the water heater should be drained or regularly flushed through with fresh
mains water once a week.
When placing the unit into service, the procedure for filling the unit and the system checks above
should be observed.
Check the operation of the Safety Valves
i) Slowly, manually open (turn black knob on end counter-clockwise), for a few seconds, the Temperature and Pressure Relief Valve (T&P Valve)
situated on the MEGAFLO Eco Solar unit (see Figure 1, p.5). 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 8 Bar Pressure Relief Valve (see Figures 5 and 6, p. 13).
NOTE: The water discharged may be very hot
Indirect Units (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 Eco Solar of 70
Direct Units
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. 60ºC is recommended. 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 clockwise (see Figure 16, p. 23). The full adjustment represents a temperature range
of between 12º and 68ºC. Check that no water is discharged from either the Expansion Valve or Temperature and Pressure Relief Valve during the
heating cycle.
Indirect Units
Fill the indirect (primary) circuit following the boiler manufacturer's commissioning instructions. To ensure the primary heating coil in the MEGAFLO
Eco Solar is filled the 2-port motorised valve (supplied) should be manually opened by moving the lever on the motor housing to the MAN OPEN
position. When the primary circuit is full return the lever to the AUTO position. Vent any trapped air by opening the air bleed.
Switch on the boiler, ensure the programmer is set to Domestic Hot Water. Allow the MEGAFLO Eco Solar unit to heat up and check that the
indirect thermostat and 2-port motorised valve operate correctly. A storage temperature of approx. 60ºC is recommended. If necessary the
temperature can be adjusted by inserting a flat bladed screwdriver in the adjustment knob (located on the front of the thermostat mounting bracket
see Figure 16, p. 23 ) and rotating clockwise to increase the temperature or counter clockwise to reduce the temperature. The minimum thermostat
setting is 12ºC. The adjustment range on the combined thermostat and thermal cut-out is 12°C-68°C
Check that no water is discharged from either the Expansion Valve or Temperature and Pressure Relief Valve during the heating cycle.
Benchmark tm Log Book
On completion of the installation and commissioning procedures detailed in this Product Guide the Benchmark
and Service Record Log", pages 34 and 35, should be completed and signed off by the competent installer or commissioning engineer in the
relevant sections. The various system features, location of system controls, user instructions and what to do in the event of a system failure should
be explained to the customer. The customer should then countersign the Benchmark
The Service Record should be filled in when any subsequent service or maintenance operation is carried out on the MEGAFLO Eco Solar unit (See
Maintenance and Servicing, p. 35).
C although 60 C is recommended to minimise scaling.
o o
TM commissioning checklist (page 34) to accept completion.
TM "Installation, Commissioning
Unvented Hot Water Cylinder
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