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7. HYDRO UNIT INSTALLATION MANUAL
Engineering Data Book
Hot water cylinder electrical box connections
Additional hydro unit outputs
Alarm and Boiler Outputs
Alarm Output: L1: Alarm output
• Output enabled when the system is in alarm/fault condition.
• Volt free contact - specification shown below:
AC230 V; 0.5 A (maximum)
DC24 V; 1 A (maximum)
• Connection details: Terminals 1 and 2 (OPERATION) on MCC-1217 TB (Refer to “Fig. 7-32”)
Boiler Control Output: L2: Boiler drive permission output
• Output enabled when outdoor ambient temperature <-10°C
• Volt free contact - specification shown below:
AC230 V; 0.5 A (maximum)
DC24 V; 1 A (maximum)
• Connection details: Terminals 3 and 4 (EMG) on MCC-1217 TB (Refer to “Fig. 7-32”)
▼ Fig. 7-31
Hydro unit
PJ20
CN208
TCB-PCIN3E
4
3
L2
2
1
L1
Fig. 7-32
Local Supply
Power Supply
Power Supply
Display
Relay
K1
Display
Relay
K2
Connection
Cable
OPERATION
EMG
ALARM
OUTPUT
BOILER
CONTROL
OUTPUT
Hydro unit main
control board
27-EN
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