26
27
Pump 3
Remo
te
Contr
oller
He
ating run
signal fr
om
sta
t or ufh
No
te if y
ou w
ant t
o use the he
ating b
ack
up he
ater
in the Combi y
ou need a bigg
er po
w
er supply
.
Ano
ther 13 Amp
s f
or the 2 and 3HP model and 26
Amp
s f
or the 4-5 and 6 kW
Comms t
o
Out
door Unit
Powe
r
16 Amps
2 Cor
e fle
x
0.75mm
Powe
r
the Hit
achi sys
tem needs 2 po
w
er supplies
Communic
ation c
able
connec
t t
o the c
ontr
ol bo
x, t
erminals 1 and 2.
Run signal
, 13 is permanently 240V ac. The run signal g
oes int
o 14. R
emo
ve the link
.
Pump 3
Liv
e 14 and Neutr
al 34 on a c
ombi wir
e liv
e t
o 36
If a lo
w loss he
ader or buff
er is used y
ou c
an c
onnec
t a
buff
er sensor
in 8 and 9
Wiring Diagr
am He
ating and Ho
t W
ater Combi
Combi Installation
Combi Installation
Before power up
On the indoor circuit board set the following switches
DSW 4, Pin 5 needs to set pushed up
DSW 4 Pin 3 push to up to enable immersion heater
Note before the unit will run the expansion valve dip switch needs
to be set by the fridge engineer.
If the pipe length is under 5m set DSW2 pin 1 up to on. If the pipe
length is over 30M set DSW2 pin 2 to up on
Vaccing and Charging
When delivered the indoor unit expansion valves are fully closed.
To open the valve you must apply power to the unit and make sure
dis switch DSW4 pin 2 to up .
You MUST pressure test, vac and charge using both service valves
at all times.
When you finish vaccing and charging switch power off the unit,
set DSW4 pin 2 to off and then power up again or the unit wont
start.
Now turn to page 33.
