Specifications

INSTALLATION – SOLAR STORAGE TANK
30
ANTI-FREEZE HEATING UNIT
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 very 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 frost 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
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.
The anti-freeze heating unit is supplied with power from the solar control unit. The power outlet to the solar
control unit must be switched on for the anti-freeze heating unit to operate and offer additional freeze
protection.
BACKING PLATE
The backing plate has been provided to support an in-series gas booster. Fit the wall bracket and secure the
solar storage tank to the wall prior to the mounting of an in-series gas booster to the solar storage tank.
Refer to “Wall Bracket” on page 26.
It is recommended to install the fittings associated with the solar control unit prior to mounting the in-series
gas booster. Refer to “Installation – Solar Control Unit” on page 34. The air bleed and solar non return valve
assembly must be fitted prior to mounting the in-series gas booster. Refer to steps 12 and 13 on page 36.
To mount the 871 series gas booster:
Remove the two mounting bolts from the centre top and
centre bottom of the backing plate.
Locate the in-series gas booster and line up the mounting
holes at the top and bottom of the in-series gas booster with
the holes on the backing plate.
Fix the in-series gas booster to the backing plate using the
two mounting bolts provided.
Note: The two screws provided in the ground kit (299158)
can be discarded.
To mount the 874 series gas booster:
Remove the mounting bolt from the centre top of the backing
plate.
Locate the in-series gas booster and line up the mounting
hole at the top of the in-series gas booster with the hole on
the backing plate.
Fix the top bracket of the in-series gas booster to the backing
plate using the mounting bolt provided.
Locate the two holes in the bottom bracket of the in-series
gas booster over the two holes toward the bottom of the
bracket.
Fix the bottom bracket of the in-series gas booster to the
backing plate using the two screws provided in the ground kit
(299158).
If an in-series gas booster is not to be mounted on the backing plate, the backing plate can be removed from
the solar storage tank. To remove the backing plate:
Remove the four mounting screws and two mounting bolts and remove the mounting plate.
Refit the four mounting screws and two mounting bolts to the holes in the solar storage tank jacket.
871 series gas booster mounting
874 series gas booster mounting