Installer Connections - Keston HEAT 2 45 Installation & Servicing

2.24 INSTALLER CONNECTIONS

I1 I2
1 2 3
L N PE
Mains Supply
Volts Free Contacts
I5
1 2 3 4 5
C NO PE C NO
MFR1 MFR2
I7 I8
1 2 1
I0 I1 PWM GND
PELV
Interlock Pump control
PELV Only
I7 Optional Interlock input.
I8 N/A.
I9 Boiler Control:
0-10V Capacity or Temperature.
OpenTherm Interface 1. Boiler, Heating Circuit 1 and/or
DHW Circuit Control.
OpenTherm Interface 2. Heating Circuit 2 Control.
*Note: The items grayed out are not standard and are connections provided by the relevant option kits.
Installation & Servicing
SECTION 2 - INSTALLATION
Mains Voltage/230V 50Hz
I3
1 2 3 4 1
SL1 L SL2 L
230V 50Hz
Demand inputs Interlock
I6
6 1 2 3 4
PE C NO C NO
MFR3 MFR4
I9
2 3 1 2 3
10V 10V GND OT1+ OT1- OT2+ OT2-
0-10V
I4
2 1 2
~ ~ L N
230V 50Hz
Auxiliary
PELV
I10
4 5 6 1
S1
OpenTherm Header
KEY
I10 Optional Sensors:
Header Sensor for Cascade Control.
DHW Tank Temperature or Heating Circuit 2 Room
Temperature.
Heating Circuit 1 Room Temperature.
Outside Temperature Sensor for Heating Curve.
KEY
l1 Mains Supply Connector, 230V
50Hz. Live, Neutral, PE.
l2 Demand inputs, Multifunctional,
230V 50Hz. Typical setting:
SL1, Heating Circuit 1
SL2, Heating Circuit 2/DHW
l3 Optional Interlock input, 230V
50Hz
l4 Auxiliary Mains Supply Output,
230V 50Hz. Live, Neutral.
Internal Pump power connection
KEY
I5 Multifunction Volts Free Relay
Outputs, 24V DC to 230V 50Hz.
Typical setting:
MFR1 Heating Circuit 1 Pump
MFR2 DHW Circuit Pump
Internal Pump PE connection
I6 MFR3 Burner On Indication
MFR4 Boiler Fault Indication
2 3 4 5 6 7 8
GND S2 GND S3 GND S4 GND
DHW Tank / Outside
Room 2 Room 1 Temp.
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