Sanden GAU-A45HPC, Owner'S Manual

Page: 12 / 20

Sanden Heat Pump – Owner’s Manual
Page 12 of 20
Electrical connections

Electrical installation should be done only by a n EcoPlus approved electrician who
carries out the work according to the relevant regulations for electrical safety and
wiring.

Follow the wiring rules for the breaker rating and the thickness of the electrical
wiring.

Verify that the tank unit is full of water and the water valves are open before
turning on the power.
System operation, if connected to continuous power

The system runs its water heating cycle once a day to fill up the storage tank unit with
heated water.

If the block out time function is selected (setting is covered in page 16 of Installation
Manual) the unit will not operate during the block out times – this function is typically
used on installations that have time of use electricity tariffs

The water heating cycle operation starts automatically when the residual hot water in
the tank unit decreases.

The system will not run if the electrical power supply is cut off (i.e. if it is connected to
off-peak power). However, the system will automatically start operation, once the
electricity becomes available.
System operation if connected to off-peak electricity

There are no special settings for the off-peak connection. The system will run once the
power becomes available and the temperature in the tank drops below the set point of
the tank thermistor. If connecting the unit to off peak ensure that the off-peak tariff
provides a minimum of 5 hours continuous power, as it can take at least four hours to
fill the tank unit with hot water at installation. If the ambient temperature is lower than
10
o
C this can be longer.

If the unit is connected to off peak power and hot water consumption has been
exceptionally high, then hot water may not be available until the next power supply
cycle.
 Daily frequency and amount of hot water consumption may also affect the duration of
the heating cycle operation.
Select the electrical supply mode that best suits the customer’s hot water consumption.
The type of off-peak connection may need to be changed if hot water supply is not
maintained as required.
Figure 5: Outline of electrical system connections