Specifications

ABOUT YOUR WATER HEATER
9
FREEZE PROTECTION
The system has a level of freeze protection designed to guard the system against damage from freeze
conditions. The system must be installed with the full length of the solar hot and solar cold pipes insulated
and power must be available at the solar control unit to offer protection against freeze damage (refer to “Pipe
Work and Insulation” on page 8). Freeze conditions occur below 6°C.
Note: The Vulcan warranty against freeze damage applies only to systems installed in Australia.
The system has NO WARRANTY for freeze damage when installed above 400 metres altitude or if the solar
hot and solar cold pipes are not insulated in accordance with the installation instructions or if power is not
available at the solar control unit (refer to “Terms of the Vulcan Warranty” on page 55).
The anti freeze control is designed to recirculate a small amount of water from the solar storage tank through
the solar pipe work and solar collector(s) during periods of low temperatures. This is to prevent the water
inside the pipe work and solar collector(s) from freezing. It is essential the electrical circuit to the solar control
unit is continually turned on if there is a risk of freezing. The Vulcan warranty does not cover damage caused
by freeze conditions when the electrical circuit to the solar control unit is turned off or interrupted.
Additional freeze protection is provided by the anti-freeze heating unit. The anti-freeze heating unit is for
heating the water at the bottom of the solar storage tank at times of low cold water temperature. The anti-
freeze heating unit provides additional energy to the water to assist in the prevention of freezing in the solar
pipe work and solar collector(s). The anti-freeze heating unit is controlled by the solar controller and will only
be energised when the water temperature is very low and the circulator activates in the Freeze Protection
operation mode. The water temperature is monitored by the cold sensor.
If the water temperature at the bottom of the solar storage tank is very low when the circulator activates in
the Freeze Protection operation mode, the anti-freeze heating unit will be energised and will heat the water
by a few degrees. The anti-freeze heating unit will be de-energised when either the frost mode is shut down
or the water temperature has risen by a few degrees.
It is essential the electrical circuit to the solar control unit is continually turned on if there is a risk of freezing.
An over temperature energy cut out is incorporated in a thermostat which is mounted on the solar storage
tank behind the front cover.
Notes:
The system is not covered for freeze damage above 400 metres altitude.
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
Vulcan warranty.
If it is necessary to switch the power off to the solar control unit and there is a risk of freezing, then it is
necessary to have your plumber drain the solar collector(s) and solar flow and return pipe work.
Refer to “Terms of the Vulcan Warranty” on page 55.