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Wiring work
Connection of the back-up boiler
Description
Back-up Boiler
B5 : Neutral (N)
B4 : Back-up boiler (L)
When it set back up
boiler on the hydro unit
(relay off )
L N
Boiler
Connecting for external contact functions
Screw size
M3
Connecting external sensors for zone control
• When connecting sensors, use a Thermistor with the specifications of 10 kΩ at 25
CAUTION
No. of wires
Mini. / Max. current
2+ground
10mA / 50mA
1 . Before the installation, hydro unit should be turned off .
2 . Using the appropriate equipment to correct position of terminal
3 . Make sure EXT-CTRL signal of back up boiler must be 230Vac .
When it order to back up
❋ ❋ Heat pump does not work when the Back-up boiler operates .
boiler operates (relay on)
L N
Boiler
Tightening torque (N·m)
0 . 5 ~0 . 7 5
0 . 7 5mm
block as shown on the diagram .
- Do not connect supply power of back up boiler directly .
Part
20P Terminal block
1
2
3
4
5
6
7
8
ENGLISH-40
Thickness
Supply Scope
H05RN-F or
Field supply (220-240V~,
2
H07RN-F
Terminal code
9 10 11 12 13 14 15 16 17 18 19 20
ZONE1
Flow
Temp .
[Tw2_z1]
(103)
ZONE2
Room
Temp .
(103)
°C
, B constant = 3435 k .
Input)
1~20
ZONE2
Flow
Temp .
[Tw2_z2]
(103)
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