6 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
6 See appendix for listing of additional components.
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermosta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermosta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FLAM E SUPPLY
CH PUMP
DHW PUMP
LN G L N G L N G L N G
FLAM E SUPPLY
CH PUMP
DHW PUMP
L
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORS INPUT
12 0 VAC
INPUT
12 0 VAC
INPUT
12 0 VAC
HHNN
INPUT
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
WATE R
SUPP LY
O S
COMBI BOILER
WITH MULTIPLE PUMPS
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermosta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermosta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FLAM E SUPPLY
CH PUMP
DHW PU MP
LN G L N G L N G L N G
FLAM E SUPPLY
CH PUMP
DHW PU MP
L
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VA C
COM
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORS INPUT
12 0 VAC
INPUT
12 0 VAC
INPUT
12 0 VAC
HHNN
INPUT
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
WATE R
SUPP LY
O S
COMBI BOILER
WITH MULTIPLE PUMPS
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermosta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermosta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FLAM E SUPPLY
CH PUMP
DHW PU MP
LN G L N G L N G L N G
FLAM E SUPPLY
CH PUMP
DHW PU MP
L
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VA C
COM
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORS INPUT
12 0 VAC
INPUT
12 0 VAC
INPUT
12 0 VAC
HHNN
INPUT
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
WATE R
SUPP LY
O S
COMBI BOILER
WITH MULTIPLE PUMPS
* No Pump Setting Changes Needed With This Configuration