52
COMMISSIONING
TO FILL AND TURN ON THE WATER HEATER
The power supply to the solar storage tank and solar control unit must not be switched on until the
water heater is filled with water
and a satisfactory megger reading is obtained.
•
Open all of the hot water taps in the house (don’t forget the shower).
•
Open the service valve fitted at the solar hot water inlet (from collector) of the solar storage tank, using a
pair of pliers or other appropriate tool. Refer to the
on page 53.
•
Open the cold water isolation valve fully on the cold water line to the water heater.
Air will be forced out of the taps and the service valve drain line.
•
Close each tap as water flows freely from it.
•
Close the service valve when water runs freely from the drain line.
The solar collectors and collector circuit should now be purged of air.
•
Check the pipe work for leaks.
•
Inspect for leaks at the temperature pressure relief valve connection to the water heater.
If a leak is detected, close the cold water isolation valve fully and relieve pressure from the water heater
by either operating the easing lever on the temperature pressure relief valve or opening a hot tap. Remove
the valve and all of its thread sealant from the threads of the valve. Reapply new thread sealant and refit
the valve. Refer to the procedure in
“Temperature Pressure Relief Valve”
on page 47.
•
Operate the easing lever on the temperature pressure relief valve to check the smooth operation of the
valve plunger and that water discharges freely from the drain line. It is very important the lever is raised
and lowered gently. The lever should move smoothly and without undue force.
If the lever cannot be moved or is jerky in its movement, then the valve has been damaged and must be
replaced.
•
Plug in the solar control unit at the power outlet and switch on the electrical supply.
The power outlet must be switched on for the solar control unit to operate and solar gain to be achieved
and for the circulating freeze protection to be available.
Refer to
“Solar Controller Operation at Start-Up”
on page 54.
Note:
The solar control unit automatically controls the flow rate through the collector circuit. This is
achieved via the hot and cold sensors and differential controller programming providing control over the
operation of the circulator. There is no provision for nor is adjustment to the solar control unit required.
•
Switch on the electrical supply at the water heater isolating switch on the switchboard and at the isolating
switch at the solar storage tank (if installed).
•
Set the timer if one is installed.
Refer to
on page 51.
•
Remove the packaging / covers from the solar collectors.
Note:
If the service 3-way valve was not opened during the tank filling procedure above, then the collector
circuit will need to be purged of air. Refer to
“Bleeding the Solar Collectors”
on page 53.
Explain to the householder or a responsible officer the functions and operation of the solar water heater and
the timer if one is installed. Upon completion of the installation and commissioning of the water heater, leave
this guide with the householder or a responsible officer.
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