Sanden
Heat
Pump
–
Installation
Manual
Page
11
of
26
Electrical
connections
Electrical installation should be done only by a licensed 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 stop cocks are open before
turning on the power.
System
operation
outline
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 14 ) 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 becomes less than 150 litres.
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 thermister. 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 if the ambient temperature is lower than 10
o
C this can
be longer.
If the unit is connected to off peak and consumption has been higher than normal hot
water might 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 9: Outline of electrical system connections
