19
18
The HIU is equipped with an electric connection box that converts the 230VAC
power supply to 24 VDC and powers the equipped SH pump and optional
DHW pump. It also houses the fuse of the unit.
CAUTION!
The HIU uses electrical component (230VAC and 24VDC). Touching these
components can result in an electrical shock, burn, or electrocution. The
casing shall only be opened by authorised personnel when the power supply
$.0/*Ȃѵ
1. 230VAC fuse (3A)
2. 230VAC connection to circuit breaker or power switch
3. 230VAC DHW circulation pump connection
4. 230VAC SH pump connection
5. 24VDC connection to electronic regulator PCB
6. LED status indicator pump relay (ON = SH pump active)
7. LED status indicator 24V (ON = 24V directed to regulator PCB)
8. WAGO connector, connecting all protective earth cables
7.4 Power supply
7. Service
1
2
3
4
5
6 7
8
insulated
230 V
230 V
Cable colours
The electronics housing is separated into a 230VAC area
and a 24VDC area. By default the following cable colours
are used:
CAUTION!
230VAC area
- Live 230VAC
Brown
-
Neutral
Blue
- Protective earth Green/Yellow
24VDC area
-
24VDC
Black
-
Ground
Brown
- Signal wire
Grey
7.5 Commissioning
Follow the steps shown below to commission the HIU. If leakage or other faults should occur, go to chapter “Troubleshoot”.
7. Service
CAUTION!
Parts and components may be hot or energized.
Contact may lead to shock, burn or electrocution.
1. Close all valves
2. Check all nuts for leakage. (nuts may become loose
during transport)
3. Make sure the electronics are securely mounted to
the frame and avoid cables from blocking the casing.
4. Make sure that the power supply is switched
*Ȃѵ*)) //# 0)$/ҁ.+*2 -' .җрҘ/*/#
power switch.
+/# +*2 -.2$/#*ȂѶ0)/$'
further notice below.
The power switch must be
permanently connected, suitably located and easily
reached. Also see chapter “Installation requirements”
Blue cable:
N (neutral)
Brown cable: L (Live 230VAC)
Green/yellow: PE (protective earth)
5. Open the domestic potable water valves (D&C) to
pressurise the unit and check for leakage.
6. Switch on the power to the unit. The LED should
show a green blinking light (2).
7. Open the DH valve (A) and check for leakage.
8. Open the DH return valve (B) and check for leakage.
9. Open the valve (E).
10. Open the SH return valve (F).
11.
/-/' $)"/# $-0$/.//# /*+ޕ**-)
work the way down. (see also chapter “Bleeding the
air”)
12. Check to see if the heating warms up.
13. It is possible to set the pump setting to optimise the
SH system. See chapter “Pump settings”.
14. Completely open a DHW outlet (tap or shower).
Check to see if the unit’s LED shows a blue blinking
light (2).
Leave it running for approximately 5 minutes.
Check if the DHW temperature has reached its set
point (default 55ºC) between 3 and 5 minutes.
15. Close all DHW outlets. The LED will now show a
green blinking light (2).
1
2
Status Indicator LED
A
B
E
F
D
C
