11See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
11See appendix for listing of additional components.
HEAT ONLY BOILER
SINGLE ZONE WITH LOW LOSS HEADER
* 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
HEAT ONLY BOILER
SINGLE ZONE WITH LOW LOSS HEADER
O S
WATE R
SUPP LY
WATE R
SUPP LY
* 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
HEAT ONLY BOILER
SINGLE ZONE WITH LOW LOSS HEADER
O S
WATE R
SUPP LY
WATE R
SUPP LY
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CCHH22
66 55
SSystysteemm
SSeennsosorr
44 33
MMoodduullaattiioonn
SSiiggnnaall
--
22
++
11
CCHH 22
tt
CCHH11
44 33
OOuuttddoooorr
SSeennsosorr
22 11
DDHHWW
SSeennssoorr
oror
AAqquuaassttaatt
22 11
MMooddbbuuss
++ GG --
33 22 11
X7X7X4X4
X6X6X5X5
Thermostat
NN GG LL NN GG LL NN GG LL NN GG
PPOOWWEERR
CCHH PPUUMMPP
DHW PUMP
FFLLAAMMEE
LL
O S
WWAATTEE RR
SSUUPPPPLLYY
Power
120VAC
Thermostat
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