MEGAFLO 400L Product Manual - page 20
Unvented Hot Water Cylinder
20
INST
ALLA
TION AND
COMMISSIONING (2)
Commissioning
Filling and flushing the MEGAFLO Eco Plus
Ensure that all fittings and immersion heaters are correctly fitted and tightened.
i) Open a hot tap furthest from the MEGAFLO Eco Plus.
ii) Open the isolating valve on the 3.5 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 discharges 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 3.5 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, Page 22
for instructions on how to do this.
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 Plus unit (see Figure 1, page 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 Figure 4, page 11).
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. 60
o
C is recommended (between graduations 4 and 5 on the thermostat). If necessary the temperature can be adjusted
by inserting a flat bladed screwdriver in the adjustment arrow on top of the immersion heater thermostat and rotating (see Fig 13, page 19). The
adjustment range 1 to 5 represents a temperature range of between 10
o
and 70
o
C.
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
Plus 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 Plus 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. The teperature can be adjusted by
turning the knob on the temperature controller to the required temperature, (see Fig 9, page 17)
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 manual the Benchmark
TM
“Installation, Commissioning and Service
Record Log, pages 26 and 27 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
TM
commissioning checklist (page 26) to accept completion. The Service Record should be filled in
when any subsequent service or maintenance operation is carried out on the MEGAFLO Eco Plus unit (See Maintenance and Servicing, page 27).