12
See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
12
See appendix for listing of additional components.
Water
Supply
WATER
SUPPLY
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VAC
COM
24 VAC
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 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OFF
ON
OFF
ON
ZONE 4
PRIORITY
OFF
ON
W
W
RR
ZONE 1
ZONE 1
W
R
ZONE 1
W
W
RR
ZONE 2
ZONE 2
W
R
ZONE 2
W
W
RR
ZONE 3
ZONE 3
W
R
ZONE 3
W
W
RR
ZONE 4
ZONE 4
W
R
ZONE 4
PRIORITY
PRIORITY
THERMOSTATS (24 VAC)
THERMOSTATS (24 VAC)
XX
XX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
X
X
ISOLATED
EN D
SW IT CH
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OFF
ON
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
120 VAC CIRCULATORS
120 VAC CIRCULATORS
INPUT
120 VAC
INPUT
120 VAC
INPUT
120 VAC
HH
NN
INPUT
120 VAC
H
N
HH
NN
ZONE 4
ZONE 4
PRIORITY
PRIORITY
H
N
ZONE 4
PRIORITY
HH
NN
ZONE 3
ZONE 3
H
N
ZONE 3
ZONE 2
ZONE 2
HH
NN
ZONE 2
H
N
ZONE 1
ZONE 1
HH
NN
ZONE 1
H
N
120 VAC
120 VAC
ZC
ZC
ZR
ZR
HH
HH
120 VAC
ZC
ZR
H
H
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VAC
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OFF
ON
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
CH2
Thermostat
6 5
System
Sensor
4 3
Modulation
Signal
-
+
2 1
CH 2
Thermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7
X4
X6
X5
CH2
Thermostat
6 5
System
Sensor
4 3
Modulation
Signal
-
+
2 1
CH 2
Thermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7
X4
X6
X5
N G L
N G L
N G L
N G
DHW PUMP
SUPPLY
CH PUMP
DHW PUMP
FLAME
L
N G L
N G L
N G L
N G
DHW PUMP
SUPPLY
CH PUMP
DHW PUMP
FLAME
L
Run 120v Single Wire From ZC To
L Terminal On The Flame Output
&
Remove The Jumper From
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
*
* Pump Setting Changes Needed With This Configuration
*
(ON)
Power
120VAC
*SEE NOTE
BELOW
Water
Supply
WATER
SUPPLY
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VAC
COM
24 VAC
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 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OFF
ON
OFF
ON
ZONE 4
PRIORITY
OFF
ON
W
W
RR
ZONE 1
ZONE 1
W
R
ZONE 1
W
W
RR
ZONE 2
ZONE 2
W
R
ZONE 2
W
W
RR
ZONE 3
ZONE 3
W
R
ZONE 3
W
W
RR
ZONE 4
ZONE 4
W
R
ZONE 4
PRIORITY
PRIORITY
THERMOSTATS (24 VAC)
THERMOSTATS (24 VAC)
XX
XX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
X
X
ISOLATED
EN D
SW IT CH
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OFF
ON
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
120 VAC CIRCULATORS
120 VAC CIRCULATORS
INPUT
120 VAC
INPUT
120 VAC
INPUT
120 VAC
HH
NN
INPUT
120 VAC
H
N
HH
NN
ZONE 4
ZONE 4
PRIORITY
PRIORITY
H
N
ZONE 4
PRIORITY
HH
NN
ZONE 3
ZONE 3
H
N
ZONE 3
ZONE 2
ZONE 2
HH
NN
ZONE 2
H
N
ZONE 1
ZONE 1
HH
NN
ZONE 1
H
N
120 VAC
120 VAC
ZC
ZC
ZR
ZR
HH
HH
120 VAC
ZC
ZR
H
H
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VAC
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OFF
ON
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
CH2
Thermostat
6
5
System
Sensor
4
3
Modulation
Signal
-
+
2
1
CH 2
Thermo sta
t
CH1
Thermostat
4
3
Outdoor
Sensor
2
1
DHW
Sensor or
Aquastat
2
1
Modbus
+
G
-
3
2
1
X7
X4
X6
X5
CH2
Thermostat
6
5
System
Sensor
4
3
Modulation
Signal
-
+
2
1
CH 2
Thermo sta
t
CH1
Thermostat
4
3
Outdoor
Sensor
2
1
DHW
Sensor or
Aquastat
2
1
Modbus
+
G
-
3
2
1
X7
X4
X6
X5
N G L
N G L
N G L
N G
DHW PUMP
SUPPLY
CH PUMP
DHW PUMP
FLAME
L
N G L
N G L
N G L
N G
DHW PUMP
SUPPLY
CH PUMP
DHW PUMP
FLAME
L
Run 120v SingleWire From ZC To
L Terminal On The Flame Output
&
Remove The Jumper From
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
*
* Pump Setting Changes Needed With This Configuration
*
(ON)
Power
120VAC
*SEE NOTE
BELOW
Water
Supply
WATER
SUPPLY
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VAC
COM
24 VAC
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 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OFF
ON
OFF
ON
ZONE 4
PRIORITY
OFF
ON
W
W
RR
ZONE 1
ZONE 1
W
R
ZONE 1
W
W
RR
ZONE 2
ZONE 2
W
R
ZONE 2
W
W
RR
ZONE 3
ZONE 3
W
R
ZONE 3
W
W
RR
ZONE 4
ZONE 4
W
R
ZONE 4
PRIORITY
PRIORITY
THERMOSTATS (24 VAC)
THERMOSTATS (24 VAC)
XX
XX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
X
X
ISOLATED
EN D
SW IT CH
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OFF
ON
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
120 VAC CIRCULATORS
120 VAC CIRCULATORS
INPUT
120 VAC
INPUT
120 VAC
INPUT
120 VAC
HH
NN
INPUT
120 VAC
H
N
HH
NN
ZONE 4
ZONE 4
PRIORITY
PRIORITY
H
N
ZONE 4
PRIORITY
HH
NN
ZONE 3
ZONE 3
H
N
ZONE 3
ZONE 2
ZONE 2
HH
NN
ZONE 2
H
N
ZONE 1
ZONE 1
HH
NN
ZONE 1
H
N
120 VAC
120 VAC
ZC
ZC
ZR
ZR
HH
HH
120 VAC
ZC
ZR
H
H
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
FOUR ZONE SWITCHING RELAY
SR 504-4
24 VAC
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OFF
ON
W
R
ZONE 1
W
R
ZONE 2
W
R
ZONE 3
W
R
ZONE 4
PRIORITY
THERMOSTATS (24 VAC)
X
X
ISOLATED
EN D
SW IT CH
120 VAC CIRCULATORS
INPUT
120 VAC
H
N
H
N
ZONE 4
PRIORITY
H
N
ZONE 3
ZONE 2
H
N
ZONE 1
H
N
120 VAC
ZC
ZR
H
H
CH2
Thermostat
6
5
System
Sensor
4
3
Modulation
Signal
-
+
2
1
CH 2
Thermo sta
t
CH1
Thermostat
4
3
Outdoor
Sensor
2
1
DHW
Sensor or
Aquastat
2
1
Modbus
+
G
-
3
2
1
X7
X4
X6
X5
CH2
Thermostat
6
5
System
Sensor
4
3
Modulation
Signal
-
+
2
1
CH 2
Thermo sta
t
CH1
Thermostat
4
3
Outdoor
Sensor
2
1
DHW
Sensor or
Aquastat
2
1
Modbus
+
G
-
3
2
1
X7
X4
X6
X5
N G L
N G L
N G L
N G
DHW PUMP
SUPPLY
CH PUMP
DHW PUMP
FLAME
L
N G L
N G L
N G L
N G
DHW PUMP
SUPPLY
CH PUMP
DHW PUMP
FLAME
L
Run 120v SingleWire From ZC To
L Terminal On The Flame Output
&
Remove The Jumper From
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
*
* Pump Setting Changes Needed With This Configuration
*
(ON)
Power
120VAC
*SEE NOTE
BELOW
