4 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermosta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermosta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Thermostat
N G L N G L N G L N G
CH-2 PUMP
POWER
CH PUMP
DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWER
CH PUMP
DHW PUMP
FLAM E
L
WATE R
SUPP LY
O S
COMBI BOILER
SINGLE ZONE WITH CLOSELY SPACE TEES
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermosta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermosta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Thermostat
N G L N G L N G L N G
CH-2 PUMP
POWER
CH PUMP
DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWER
CH PUMP
DHW PUMP
FLAM E
L
WATE R
SUPP LY
O S
COMBI BOILER
SINGLE ZONE WITH CLOSELY SPACE TEES
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermosta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermosta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Thermostat
N G L N G L N G L N G
CH-2 PUMP
POWER
CH PUMP
DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWER
CH PUMP
DHW PUMP
FLAM E
L
WATE R
SUPP LY
O S
COMBI BOILER
SINGLE ZONE WITH CLOSELY SPACE TEES
Power
120VAC
* No Pump Setting Changes Needed With This Configuration