Kelvinator KCT27036A Installation Manual - page 14
14 electrical connection Kelvinator heat pump hot water system
Electrical wiring
The heat pump hot water system must be installed in
accordance with the AS/NZS 3000 wiring rules, the local
electrical authority regulations and any other applicable
standards. The pipe work, storage tank and heat pump are
to be properly connected to the earthing system of the
premises in accordance with AS/NZS 3000. The fixed wiring
must be protected by insulating sleeving with the appropriate
temperature rating and a means for disconnection must be
incorporated into the wiring.
The heat pump hot water system has the capability to be
wired on a standard continuous power supply or with an
additional off-peak supply if this is available at the premises.
The heat pump requires a continuous power supply in both
conditions in order to power the electronics that control the
heat pump, to ensure it has freeze protection and to allow
the auxiliary heating boost function to operate at any time
of the day. The continuous supply cable must be capable of
handling the current required to power the 3.6kW element in
the storage tank.
warning
In order to avoid a hazard due to inadvertent resetting of
the heat pump's protective cut-outs, the continuous supply
must not be supplied through an external switching device
such as a timer, or connected to a circuit that is regularly
switched on and off by the utility.
If an off-peak power supply is connected to the heat pump,
it will only operate its automatic heating function when the
off-peak power supply becomes available. The heat pump
has been designed to operate on extended off-peak which is
available up to 18 hours of the day compared to the standard
off-peak which is available only 8 hours. The off-peak power
supply cable must be capable of handling the current required
to operate the 1.95kW compressor circuit of the heat pump.
Note: Please refer to the AS/NZS 3008 standard for the current
carrying capacity of the cables to be used to ensure that they
are capable of handling the current draw of the heat pump in
the conditions that they are to be installed in.
When the cables are run externally, they are to be installed
in conduit in order to provide mechanical protection. The
recommended size of the conduit to the heat pump is 25mm
due to the number and size of the cables required to connect
to the hot water system. A junction box or tee piece will need
to be installed in order for one conduit to go to the heat pump
and one to the storage tank. The storage tank has provision
for a 20mm conduit adapter and a 25mm to 20mm reducer
may need to be installed at the junction box or tee piece. It is
recommended that an isolator be installed that can disconnect
each power supply to the heat pump simultaneously, to assist
in maintenance and shut down of the hot water system, this
however, is not mandatory.
Depending on the wiring configuration, two or three cables will
be wired to the heat pump. The power supply cable(s) will be
run from the switchboard to the heat pump whilst the storage
tank heater cable will be run between the storage tank and the
heat pump. All cables will need to pass through a junction box,
tee piece or isolator in order to branch off to their separate
locations. If this heat pump hot water system is replacing an
existing electric hot water system, a power supply cable may
already be available for use. An additional active wire may need
to be run from the switchboard as required in order to give the
heat pump a continuous or an off-peak power supply.
For safety reasons it is recommended that the wiring of the
heat pump and storage tank be completed first before the
cables are wired to the switchboard. If you are replacing an
existing electric hot water system and re-using the existing
cable, ensure that the power supply to this cable is isolated or
disconnected at the switchboard.
Wiring the heat pump
All cables are to be passed through the cable clamp inside
the terminal box and the clamp securely fastened so that if
the conduit or cables are pulled, no stress is placed on the
terminal connections.
For safety reasons, all earths are to be connected first and
wired to the G terminal.
The continuous power supply input and the storage tank
heater output cables must both be capable of handling the
current draw of the 3.6kW element. The active wire of the
continuous supply input must be wired to the “HL” terminal
and the neutral wire to the HN terminal.
The active wire of the storage tank heater output cable is to be
wired to the L1 terminal and the neutral wire to the
N1 terminal.
Electrical connection
*
*
*
XP10
XS10
T5
XT2
re
d
re
d
b
lu
e
w
hi
te
b
la
ck
b
la
ck
temp sensor
in water tank
please connect with the
attached T5 temp. sensor
For installation on continuous only
phase, install jumper leads between
compressor supply input and
continuous supply input terminals
as per diagram.
N2 compressor circuit supply input 220-240V~ 50Hz
L2 connect to off-peak or continuous supply
G
common earth terminal
HN continuous supply input
HL 220-240V~ 50Hz
N1
heater line output
L1
14 electrical connection Kelvinator heat pump hot water systems