40
41
Wiring and Power Supply Information, All systems
Wiring and Power Supply Information, All systems
The Hitachi system needs 2 power supplies:
Outdoor unit
,
you need a power supply to the outdoor unit. 20
Amp for the 2 and 3 HP, 32 Amp for the 4, 5 and 6HP and 25 Amp 3
phase for the 8 and 10HP units.
The
indoor unit
for,
Split low temp and mono bloc
a 20 Amp
supply, this wires into power terminals at the bottom of the
electrics box.
On a
Combi unit
,
the power terminals look like 3 phase, if you’re
using single phase power supplies you put your live into the 1ˢᵗ
Phase and use the top terminal as neutral as normal.
On
High temp units
,
you need 32 Amp supply to power for the
unit and the immersion heater combined. This wires into power
terminals in the top-left corner of the electrics box
The
Immersion heater
is connected into the control box terminals
31 Live and 30 Neutral; the control box controls the operation of
the immersion heater. If a fused spur is used it must be labelled
“do not turn off” as switching it off will cause an error.
Communication cable
must be run from the outdoor unit
terminals 1 and 2 to the control box, terminals 1 and 2. Use 2 core
screened 0.75mm (its 16V ac). It must not have any breaks in it or
switches.
Remote controller
is normally installed next to the control box
out of easy reach, it is mainly used for commissioning.
You need
to supply
a 2 core 0.75mm 2 core flex from 3 and 4 in the remote
controller to 3 and 4 in the control box. Maximum distance is 100m.
The
cylinder sensor
is 1m long, you need to connect this using
0.75mm flex 2 core to terminals 5 and 6 in the control box and into
the cylinder in the top ½ of the cylinder. It must install above the
immersion heater. You must fix it so it can’t be pulled out of the
cylinder. Keep it well away from any mains cables.
The
Buffer sensor
is 1m long, you need to connect this using
0.75mm flex 2 core to terminals 7 and 8 in the control box and into
the buffer or header at the top. You must fix it so it can’t be pulled
out. Keep it well away from any mains cables.
3 port valve
needs to be connected to terminals 32 live and 34
Neutral the orange and grey wires are not used.
When using multi zone heating systems on a header, buffer or HEX
When the stat is made, it will drive its zone valve open, inside the zone valve a switch links the orange to the grey wire when the valve
is open. We connect the grey to 14 the run signal and the orange to 13 permanent live, so when the valves open the heat pump will
run. Hot water production is not affected and will always take priority.
Pump Z1
is connected live to 14 Live and Neutral to 34
Thermostats/ timers and under floor heating manifolds
, the heating is controlled with a field supplied room stat / setback stat, time
clock or a run signal from an under-floor manifold. 13 is permanently 240V ac. The run signal goes into 14.
Valve Z2
Power In
Valve Z1
Pump Z1
Run Signal to
Heat Pump
14
14
34
13
Power In
