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ELECTRICAL CONNECTION
The booster is equipped with a three pinned earthed plug to be connected to a 240V, 50Hz
continuous electrical supply. The electrical rating of the appliance is 0.4 Amps
The appliance requires a 240V, 50Hz weatherproof plug installed in a protected position
adjacent to the appliance.
IMPORTANT
: The appliance should always be disconnected from the power supply
before any maintenance is carried out.
If the power cord is damaged and requires
replacement, use only an original spare part available from the manufacturer.
PRE-SET TEMPERATURE
The Bosch water heaters are factory pre-set to deliver hot water at 55°C, however when used
as a booster unit in conjunction with a solar hot water system, the booster will need to be
adjusted to 75°c.
Supplied with the booster unit are two temperature bridges, a 60°c bridge (Blue wire marked
„B‟) and a 75°c bridge black wire (marked „A‟)
To alter the delivery temperature:
1. Turn the power supply to the unit off and remove three pin power plug from supply.
2. Remove front cover of booster by removing the four securing screws (Disconnect the
earth wire).
3. Contained inside a plastic bag and taped to the inside of the front cover are the two
bridges.
4. Remove the 75°c bridge from the plastic bag.
5. Located on the right hand side of the booster is the Printed Circuit Board (PCB).
6. At the top of the PCB (Between the temperature controller connection points is
provision for the insertion of a polarised plug).
7. Carefully insert the bridge into the PCB.
8. Refit the front cover of the unit (Refit the earth wire)
9. Fit three pin power plug to the power supply.
10. Turn the power supply on.
The booster will now automatically boost the water temperature to 75°c.
Note
The Solar booster cannot be fitted with temperature control pads.
COMMISSIONING AND TESTING
After completing the installation of the system, connect manometer to gas inlet test point, turn
on the water, power and gas supplies to the unit. Confirm the booster delivers the temperature
the consumer requires. With the hot water running, confirm correct gas inlet pressure and
remove manometer. Retighten test point and soap test. Test operation of the appliance,
explain operation to consumer & hand over these installation instructions. Please leave your
contact details with the consumer. This initial commissioning procedure can only be performed
whilst the solar storage tank is cold and the solar booster is operating at maximum.
BURNER PRESSURE ADJUSTMENT
No adjustment should be necessary providing the gas inlet pressure is correct.
Burner pressure adjustment is necessary when converting to a different gas type or replacing
the PCB. Refer to service manual for details.
