COMMISSIONING
53
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater on completion of the installation, such as on a building site or
where the premises is vacant, then:
•
Switch off the electrical supply at the water heater isolating switch on the switchboard and at the isolating
switch at the solar storage tank (if installed).
•
Switch off the electrical supply to the solar control unit at the power outlet (refer to note below).
•
Close the cold water isolation valve at the inlet to the water heater.
Notes
•
The freeze protection system will be rendered inoperable if electrical power is not available at the solar
control unit. Damage caused by freezing due to no power at the solar control unit is not covered by the
Solahart warranty.
•
If there is a risk of freezing, then it is necessary to drain the solar collectors and solar hot and solar cold
pipes (refer to
“Draining the Solar Collectors”
on page 56).
•
Refer to
“Terms of the Solahart Warranty”
on page 4.
BLEEDING THE SOLAR COLLECTORS
Upon completion of the installation, if the service
3-way valve was not opened during the tank filling
procedure, then it is necessary to purge the air
from the collector circuit.
To purge air from the collector circuit:
•
Ensure the water heater is full of water and all
of the hot taps are turned off.
•
Using a pair of pliers or other appropriate tool,
open the service 3-way valve fitted at the
solar hot water inlet (from collector) of the
solar storage tank (see diagram).
Warning:
Stand well aside of the service
valve drain pipe discharge point and exercise
care to avoid any splashing of water, as water
or in some circumstances steam discharged
from the solar collectors may be of a very high
temperature.
•
The mains pressure will force water to flow from the tank and through the pipe work, forcing air from the
collector circuit through the service valve. This is evidenced by spurting of water from the drain line
connected to the service valve.
Note:
Allow water to flow from the drain line for a few minutes before closing the service valve. Water
already in the solar hot pipe will drain out prior to air in the top of the collector circuit being purged by the
mains pressure water rising in the solar cold pipe.
•
Close the service valve when water runs freely under mains pressure from the drain line.
Service 3-Way Valve
SERVICE 3 WAY VALVE
Solar Pumped Open Circuit
