Taco SR501-4, SR501-HC-4, SR501-OR-4, SR502-4, SR503-4 User Manual
...
The All New . . .
TACO ZONE CONTROLS WIRING GUIDE
Pages
Switching Relays – Single Zone Wiring 2– 4
Switching Relays – Oil Boiler Wiring Safety Notice –5
Switching Relays – NON
Switching Relays – EXP Connected Together with Priority 10 – 13
Switching Relays – Multiple Indirect Hot Water Heaters 14 – 15
Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 16 – 27
Zone Valve Controls – NON
Zone Valve Controls – EXP Connected Together with Priority 33 – 36
Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 37 – 44
Hydro Air Fan Controls (HAFC 201) 45 – 47
New Expandable Zone Control – Connected to Older Expandable Zone Control 48 – 50
Specialty Thermostat and Zone Valve Wiring 51 – 59
Radiant Mixing Block 60 – 61
X-Pump Block 62 – 64
iSeries Mixing Valves 65 – 66
EXP Connected Together with Priority 6– 9
EXP Connected Together with Priority 28 – 32
Low Water Cutoffs and Electric Water Feeders 67 – 82
Aquastat Wiring 83 – 89
Instruction Sheets 90 – 102
Standard Terms and Definitions – 103
Zone Controls Cross Reference 104 – 105
Do it once.
Do it right.
©
Taco Catalog No. 100-92
Effective Date: November 27, 2014
Supersedes Date: September 20, 2013
TACO Zone Control Product Information
Switching Relays
Product No. Description
SR501-4 1 Zone Switching Relay
SR501-HC-4 1 or 2 Zone Switching Relay, High Current Capacity
SR501-OR-4 1 Zone Switching Relay with Outdoor Reset
SR502-4 2 Zone Switching Relay with Priority
SR503-4 3 Zone Switching Relay with Priority
SR504-4 4 Zone Switching Relay with Priority
SR506-4 6 Zone Switching Relay with Priority
Expandable Switching Relays – Expandable to 120 Zones (20 Zoning Panels)
Product No. Description
SR501-EXP-4 1 Zone Switching Relay
SR503-EXP-4 3 Zone Switching Relay with Priority
SR504-EXP-4 4 Zone Switching Relay with Priority
SR506-EXP-4 6 Zone Switching Relay with Priority
Zone Valve Controls
Product No. Description
ZVC403-4 3 Zone Valve Control with Priority
ZVC404-4 4 Zone Valve Control with Priority
ZVC405-4 5 Zone Valve Control with Priority
ZVC406-4 6 Zone Valve Control with Priority
Expandable Zone Valve Controls – Expandable to 120 Zones (20 Zoning Panels)
Product No. Description
ZVC404-EXP-4 4 Zone Valve Control with Priority
ZVC406-EXP-4 6 Zone Valve Control with Priority
Add-On Power Controls (For use with all -EXP controls)
Product No. Description
PC700 Boiler Reset Control
PC702 2-Stage Boiler Reset Control
PC705 Variable Speed Pump Injection Mixing Control
Fan Controls
Product No. Description
HAFC201-4 Hydro Air Fan Control with Optional Time Delays
Do it once.
Do it right.
TYPICAL WIRING
(COLD START)
ONE ZONE
SWITCHING RELAY
SR 501-4
FUSE
6 AMP
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
N H 3 4 4 56 6
N/O N/ON/C N/CCOM COM
120 VAC
INPUT
T T
COM
R
W
24
VAC
TO: 120 VAC POWER
CIRCULATOR
JUMPER
TO: TT ON
BOILER
THERMOSTAT
TO: 120 VAC POWER
CIRCULATOR
TO: ZC
TO: ZR
ALTERNATIVE WIRING
(TANKLESS COIL)
ONE ZONE
SWITCHING RELAY
SR 501-4
FUSE
6 AMP
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
N H 3 4 4 56 6
N/O N/ON/C N/CCOM COM
120 VAC
INPUT
T T
COM
R
W
24
VAC
THERMOSTAT
TO: 120 VAC POWER
CIRCULATOR
TO: TT ON BOILER
ALTERNATIVE WIRING
(24 VAC POWERED INPUT SIGNAL)
N
H
REMOVE JUMPER.
DO NOT CONNECT POWER
TO N AND H TERMINALS.
* T STAT LIGHT WILL GO
ON AND OFF WITH 24 VAC
SIGNAL. POWER LIGHT
WILL ALWAYS BE OFF.
ONE ZONE
SWITCHING RELAY
SR 501-4
FUSE
6 AMP
POWER *
ZONE 1 *
LED
INDICATORS
FUSE
6 AMP
N H 3 4 4 56 6
N/O N/ON/C N/CCOM COM
120 VAC
INPUT
T T
COM
R
W
24
VAC
24 VAC
SIGNAL
SR501-4 Switching Relay Wiring
a secondary source of power being connected to the boiler that
aquastat. Failure to follow these wiring instructions may result in
may activate it under certain circumstances, causing injury or death.
Note: When using Alternative Wiring diagram, the boiler oper-
instructions must be followed so power originates from the boiler
ating control’s ZC terminal will see the load of the circulator(s).
Warning: When using Alternative Wiring diagram, wiring
2
ONE ZONE HC
S
WITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TT T
NHX1
RELAY 2RELAY 1
120 VAC
INPUT
120 VAC
C
IRCULATOR
X1
X2
X2
N
ZR
ZC
H
POWER INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
O
NE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W
1
24 VAC THERMOSTAT
W
2
COM
24
VAC
TT T
NHX1
R
ELAY 2RELAY 1
120 VAC
I
NPUT
P
OWER
INPUT
(120 VAC)
120 VAC
CIRCULATOR
X1
X2
X2
N
H
BOILER
C
ONTROL
P
OWER
R
ELAY 1
RELAY 2
SR501-HC-4 – One Zone Switching Relay with or without Boiler Enable
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TT T
NHX1
RELAY 2RELAY 1
120 VAC
INPUT
240 VAC
CIRCULATOR
X1
X2
X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE
(CONTROL & CIRCULATOR SAME POWER SOURCE)
CONTROL POWER
INPUT (120 VAC)
POWER
RELAY 1
RELAY 2
(240 VAC)
{
{
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
24 VAC THERMOSTAT
W2
COM
24
VAC
TT T
NHX1
RELAY 2RELAY 1
120 VAC
INPUT
240 VAC
CIRCULATOR
X1
X2
X2
N
H1
H2
ONE ZONE, NO BOILER ENABLE
(CONTROL & CIRCULATOR DIFFERENT POWER SOURCE)
H
POWER
RELAY 1
RELAY 2
CONTROL POWER
INPUT (120 VAC)
(240 VAC)
{
{
ONE ZONE HC
SWITCHING RELAY
SR 501-HC-4
LED
INDICATORS
R
W1
W2
COM
24
V
AC
TT T
NHX1
RELAY 2RELAY 1
120 VAC
INPUT
CIRCULATOR #1
(120 VAC)
X1
X2
X2
N
TWO ZONE, NO BOILER ENABLE
H
CIRCULATOR #2
(120 VAC)
THERMOSTAT #2
(24 VAC)
T
HERMOSTAT #1
(24 VAC)
POWER
INPUT
(120 VAC)
POWER
RELAY 1
RELAY 2
Typical
Wiring
3
ELAY RATING:
R
(6.9 FLA, 41.4 LRA at 240 VAC)
P (13.8 FLA, 82.8 LRA at 120 VAC)
⁄4H
Alternative
Wiring
OTE: When using Alternative Wiring diagram, refer to important NOTE
N
and WARNING in SR501-HC Instruction Sheet on page 91 of this booklet.
3
SR501-OR-4 – One Zone Switching Relay with Outdoor Reset
ONE ZONE INSTALLATION
W/O INDIRECT DHW
O
NE ZONE
S
WITCHING RELAY
WITH OUTDOOR RESET
SR 501-OR-4
LED
INDICATORS
POWER
T
STAT
DHW
OVERRIDE
BOILER
RELAY
NH
INPUT
120 VAC
ZONE 1
120 VAC
NH
6
AMP
X
R
BOILER TSTAT
WCRW
DHW
OUTDOOR
SENSOR
SUPPLY
S
ENSOR
X
DESIGN OUTDOOR
TEMPERATURE
FOR 180°F SUPPLY
TEMPERATURE
OFF
-
30
-20
0
-10 10
20
40
3
0
ON
SW1
OFF
S
YSTEM
C
IRCULATOR
N
H
P
OWER
INPUT
(120 VAC)
2
4 VAC
THERMOSTAT
B
OILER
CONTROL
OUTDOOR
SENSOR
BOILER
SUPPLY
SENSOR
POT1
ZONE VALVE INSTALLATION
W/O ZONE CONTROL, W/O INDIRECT DHW
ONE ZONE
SWITCHING RELAY
WITH OUTDOOR RESET
SR 501-OR-4
LED
INDICATORS
POWER
TSTAT
DHW
OVERRIDE
BOILER
RELAY
NH
INPUT
120 VAC
ZONE 1
120 VAC
NH
6
AMP
X
R
BOILER TSTAT
W
C
R
W
DHW
OUTDOOR
SENSOR
SUPPLY
SENSOR
X
DESIGN OUTDOOR
TEMPERATURE
FOR 180°F SUPPLY
TEMPERATURE
O
FF
-30
-20
0
-
10 10
20
4
0
30
ON
SW1
OFF
ZONE VALVE
CIRCULATOR
N
H
POWER
INPUT
(
120 VAC)
BOILER
CONTROL
OUTDOOR
SENSOR
BOILER
SUPPLY
SENSOR
POT1
Z
ONE VALVE
END SWITCH(S)
THERMOSTATS
(24VAC)
TRANSFORMER
24 VAC
120 VAC
INPUT
MULTI-ZONE INSTALLATION
WITH ZONE CONTROL, W/O INDIRECT DHW
ONE ZONE
SWITCHING RELAY
WITH OUTDOOR RESET
SR 501-OR-4
LED
INDICATORS
POWER
TSTAT
DHW
OVERRIDE
BOILER
RELAY
NH
INPUT
120 VAC
ZONE 1
120 VAC
NH
6
AMP
X
R
BOILER TSTAT
W
CR
W
DHW
OUTDOOR
SENSOR
SUPPLY
SENSOR
X
DESIGN OUTDOOR
TEMPERATURE
FOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0
-10 10
20
40
30
ON
SW1
OFF
ZONE VALVE
CIRCULATOR
N
H
POWER
INPUT
(120 VAC)
BOILER
CONTROL
OUTDOOR
SENSOR
BOILER
SUPPLY
SENSOR
POT1
1234
ZONE 1
1234
ZONE 2
1234
ZONE 3
EXISTING
ZONE VALVE CONTROL
POWER IN
24 VAC
N/O
COM
N/C
PUMP END
S
WITCH
FUSE
5 AMP
ZONE 3 PUMP
END SWITCH
THERMOSTATS
(24VAC)
T
STAT 1
V
ALVE 1
T
STAT 2
VALVE 2
T
STAT 3
VALVE 3
P
OWER
L
ED
INDICATORS
ZONE 1 ZONE 2 ZONE 3
ISOLATED
XXRWRW RW
END SWITCH THERMOSTATS
PRIORITY
24 VAC ZONE VALVES
PRIORITY
XX
ZONE 3
P
RIORITY
OFF
ON
CCC
2 WIRE ZONE VALVE
(
NO END SWITCH)
M
UST USE JUMPER
TACO 3 WIRE
ZONE VALVE
1
2
3
JUMPER
3
& 4
TACO 3 WIRE
ZONE VALVE
1
2
3
MULTI-ZONE INSTALLATION
WITH ZONE CONTROL, WITH INDIRECT DHW
ONE ZONE
SWITCHING RELAY
WITH OUTDOOR RESET
SR 501-OR-4
LED
INDICATORS
POWER
TSTAT
DHW
OVERRIDE
BOILER
RELAY
NH
INPUT
120 VAC
ZONE 1
120 VAC
NH
6
AMP
X
R
BOILER TSTAT
WCRW
DHW
OUTDOOR
SENSOR
SUPPLY
SENSOR
X
DESIGN OUTDOOR
TEMPERATURE
FOR 180°F SUPPLY
TEMPERATURE
OFF
-30
-20
0
-10 10
20
40
30
ON
SW1
OFF
ZONE VALVE
CIRCULATOR
N
H
POWER
INPUT
(120 VAC)
BOILER
CONTROL
OUTDOOR
SENSOR
BOILER
SUPPLY
SENSOR
POT1
1234
Z
ONE 1
1234
Z
ONE 2
1234
Z
ONE 3
E
XISTING
Z
ONE VALVE CONTROL
POWER IN
24 VAC
N/O
COM
N/C
PUMP END
S
WITCH
FUSE
5 AMP
ZONE 3 PUMP
END SWITCH
THERMOSTATS
(24VAC)
T
STAT 1
V
ALVE 1
T
STAT 2
V
ALVE 2
T STAT 3
V
ALVE 3
POWER
LED
INDICATORS
ZONE 1 ZONE 2 ZONE 3
ISOLATED
XXRWRW RW
END SWITCH THERMOSTATS
PRIORITY
24 VAC ZONE VALVES
PRIORITY
XX
Z
ONE 3
PRIORITY
OFF
ON
CCC
2 WIRE ZONE VALVE
(NO END SWITCH)
M
UST USE JUMPER
T
ACO 3 WIRE
ZONE VALVE
1
2
3
JUMPER
3 & 4
TACO 3 WIRE
ZONE VALVE
1
2
3
D
HW
A
QUASTAT
A
4
NOTE: Tankless coil has priority.
L1 L2
T T
LINE VOLTAGE
OIL BURNER RELAY
CIRCULATOR
ON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124
OR EQUAL
120 VAC INPUT
C2
ZC
L1 L2
(NEUTRAL)(HOT)
C
IRCUIT
BREAKER
CUSTOMER
EMERGENCY
SWITCH
THERMAL
FUSE
(FIROMATIC)
SERVICE
SWITCH
LOW
WATER
CUTOFF
T
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XXRWRWRWRW
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
HHNHNHNHNHNH
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
2
4 VAC
COM
THERMOSTATS
T
5
BOILER
H
N
TT T
TT T
OUTPUT
NOT
USED
120 VAC INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-4
FUSE
6
AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6
AMP
FUSE
6
AMP
XX
RW
RW
RW
RW
ISOLATED
E
ND
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
HHNHNHNHNH NH
ZONE4
ZONE 2
P
OWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
Z
ONE 4
PRIORITY
OFF
ON
PRIORITY
T
O: "TT" ON BOILER
JUMPER
24 VAC
COM
DHW
HEATER
CIRCULATOR
THERMOSTATS
120 VAC INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XX
RW
RW
RW
RW
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
HHNHNHNHNH NH
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
JUMPER
24 VAC
COM
TO: "TT" ON BOILER
I
NDIRECT
W
ATER HEATER
A
QUASTAT OR
THERMOSTAT
Two Switching Relays Connected Together
6
TO: "TT" ON BOILER
1
20 VAC INPUT
BOILER
H
N
MASTER
SLAVE
PRIORITY
ON
PRIORITY
OFF
120 VAC
INPUT
SIX ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XX
RW
RW
RW
RW
RW
RW
ISOLATED
E
ND
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
HHNHNHNHNHNHNHNH
ZONE6
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LED
INDICATORS
ZONE 6
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
REMOVE
JUMPER
P
PRIORITY
24 VAC
OUTPUT
(OPTIONAL)
POWER IN
H
(on)
MASTE
R
CIRC.
ON
P
RIORITY
M
ASTER/SLAVE
SWITCH
RW
X
X
RC
THERMO-
STAT
END
SWITCH
24 VAC
POWER
N
P
RIORITY ZONING
CIRCULATOR
I
NDIRECT
W
ATER HEATER
AQUASTAT OR
T
HERMOSTAT
Priority Zoning Circulator Controlling Switching Relay
7
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
120 VAC INPUT
TO: "TT" ON BOILER
H
N
SLAVE
120 VAC INPUT
REMOVE
JUMPER
MASTER
PRIORITY
ON
P
PRIORITY
POWER IN
H
(on)
MASTE
R
CIRC.
ON
PRIORITY
MASTER/SLAVE
SWITCH
R W X X
R C
THERMO-
STAT
END
SWITCH
24 VAC
POWER
N
PRIORITY ZONING
CIRCULATOR
TT T
120 VAC INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
T
BOILER
SLAVE
REMOVE
JUMPER
TT T
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
T
TO: "TT" ON BOILER
PRIORITY
OFF
PRIORITY
OFF
24 VAC
OUTPUT
(OPTIONAL)
Priority Zoning Circulator Controlling 2 Switching Relays
8
120 VAC INPUT
TO: "TT" ON BOILER
H
N
SLAVE
120 VAC INPUT
REMOVE
JUMPER
MASTER
TT T
120 VAC INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
T
BOILER
SLAVE
REMOVE
JUMPER
TT T
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
T
ONE ZONE
SWITCHING RELAY
SR 501-4
FUSE
6 AMP
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
N H 3 4 4 56 6
N/O N/ON/C N/CCOM COM
120 VAC
INPUT
T T
COM
R
W
24
VAC
CIRCULATOR
JUMPER
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
PRIORITY
OFF
PRIORITY
OFF
SR501 Switching Relay Controlling 2 Switching Relays
9
SR501-EXP Switching Relay Controlling Another Switching Relay
120 VAC INPUT
TO: "TT"
ON BOILER
BOILER
H
N
MASTER
TO: "TT" ON BOILER
POWER
ZONE 1
LED
INDICATORS
F
USE
6 AMP
F
USE
6 AMP
SR 501-EXP-4
P
OWER
CONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
P
RIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
O
FF
OFF
NORMAL
4 MIN/24 HOUR
A
CCESSORY
PORT
DHW HEATER
CIRCULATOR
HN/O NH
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
1
20 VAC
E
ND
SWITCH
R
ESET
OVERRIDE
THERMOSTATEXPANSION
X
W
R
X1A 2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
120 VAC INPUT
SLAVE
PRIORITY
OFF
SIX ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
XX
RW
RW
RW
RW
RW
RW
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
HHNHNHNHNHNHNH NH
ZONE6
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LED
INDICATORS
ZONE 6
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
REMOVE
JUMPER
T
INDIRECT
W
ATER HEATER
A
QUASTAT OR
THERMOSTAT
N
OTE 1: Terminals C are for
optional 24V thermostat
C
OMMON connections.
10
SR501-EXP Switching Relay Controlling a Zone Valve Control
TO BOILER AQUASTAT RELAY
BOILER
H
N
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.
120 VAC
INPUT
TO BOILER AQUASTAT RELAY
SLAVE
SYSTEM PUMP TURNS ON WHEN ANY ZONE VALVE OPENS
EXCEPT WHEN THE DHW HEATER (SR501-EXP) CALLS.
MASTER
P
OWER
ZONE 1
LED
INDICATORS
F
USE
6
AMP
F
USE
6
AMP
SR 501-EXP-4
P
OWER
CONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
P
UMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
O
FF
N
ORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
D
HW HEATER
CIRCULATOR
HN/O NH
1
20 VAC
CIRCULATOR
PRIMARY
O
UTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
T
HERMOSTATEXPANSION
X
W
R
X1A 2CB
24 VOLTS AC ONLY
C
S
INGLE ZONE
EXPANDABLE SWITCHING RELAY
120 VAC INPUT
1234
ZONE 1
1234
ZONE 2
1234
ZONE 3
1234
ZONE 4
1234
ZONE 5
1234
ZONE 6
PRIORITY
ZONE
2 WIRE ZONE VALVE
(NO END SWITCH)
MUST USE JUMPER
TACO
3 WIRE
ZONE VALVE
1
2
3
JUMPER
3 & 4
MOTOR END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN,
SELF CLOSING)
JUMPER
3 & 4
ZVC 406 – 4
SIX ZONE
ZONE VALVE CONTROL
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
POWER IN
24 VAC
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
DRY
CONTACTS
N/O
COM
N/C
PUMP END
SWITCH
ZONE 6 PUMP
END SWITCH
THERMOSTATS (24VAC)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
T STAT 4
VALVE 4
VALVE 5
T STAT 6
VALVE 6
POWER
LED
INDICATORS
T STAT 5
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ISOLATED
XX
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
XX
ZONE 6
PRIORITY
OFF
ON
NOTE 2: When a circulator
is used on the priority zone
instead of a zone valve,
jumper 3 and 4 of the
priority zone.
FUSE
5 AMP
RW
See NOTE 1
RW
RW RWC CC
RW
C
C
FUSE
5 AMP
RW
C
Powered from Transformer A Powered from Transformer B
A
B
Powered from Transformer A Powered from Transformer B
SYSTEM
PUMP
T
TT
INDIRECT
W
ATER HEATER
A
QUASTAT OR
THERMOSTAT
PRIORITY
ON
NOTE 1: Terminals C are for
optional 24V thermostat
C
OMMON connections.
11
1
20 VAC INPUT
BOILER
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Normal
120 VAC INPUT
H
N
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On
Reset/Normal: Normal
TO: "TT" ON BOILER
DHW
CIRCULATOR
SLAVE
MASTER
F
OUR ZONE
EXPANDABLE
S
WITCHING RELAY
P
OWER
CONTROLS
1
20 VAC CIRCULATORS
ZC
INPUT
120 VAC
Z
ONE 1
Z
ONE 2 ZONE 3 ZONE 4
Z
ONE1 Z
ONE2 Z
ONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
F
USE
6
AMP
FUSE
6 AMP
FUSE
6 AMP
F
USE
6
AMP
F
USE
6
AMP
NET
E
XPANSION
M
AIN PRIORITY
XXXXAB
CRW
CRW
CRW
CRWC12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
P
RIMARY
1
20 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
P
RIORITY PROTECT ON
P
UMP EXERCISE ON
3
0 SEC/2 WK
MASTER
O
FF
OFF
OFF
O
FF
O
FF
N
ORMAL
LOW LIMIT (ZC) ON OFF
4
MIN/24 HOUR
Z
ONE4 ZONE4
PRIORITY
A
CCESSORY
PORT
ZONE 2
POWER
Z
ONE 1
Z
ONE 3
ZONE 4
L
ED
INDICATORS
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
TO: "TT" ON BOILER WITH
DHW "TT" INPUT
SIX ZONE
EXPANDABLE SWITCHING RELAY
P
OWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5
THERMOSTATS
SR 506-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XX
AB
CRW
CRW
CRW
CRW
CRW
CRW
C
12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
HHNHNHNHNHNHNHNHNH NH
SLAVE
P
RIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
N
ORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE6 ZONE6
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LED
INDICATORS
T
T
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
NOTE 1: Terminals C are for
optional 24V thermostat
C
OMMON connections.
See NOTE 1
See NOTE 1
2 Expandable Switching Relays Connected Together
12
120 VAC INPUT
BOILER
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On
Reset/Normal: Normal
120 VAC INPUT
H
N
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Normal
TO: "TT" ON BOILER
SLAVE
MASTER
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
TO: "TT" ON BOILER WITH
DHW "TT" INPUT
SIX ZONE
EXPANDABLE SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2
ZONE 3
ZONE 4 ZONE 5 ZONE 6
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
THERMOSTATS
SR 506-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE6 ZONE6
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
LED
INDICATORS
T
T
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Normal
SLAVE
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
DHW
CIRCULATOR
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
See NOTE 1 See NOTE 1
3 Expandable Switching Relays Connected Together
13
120 VAC INPUT
TO: "TT" ON BOILER
H
N
SLAVE
120 VAC INPUT
MASTER
TT T
120 VAC INPUT
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
BOILER
SLAVE
ZONE
NOT
USED
TT T
FOUR ZONE SWITCHING RELAY
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS (24 VAC)
PRIORITY
120 VAC
ZR
H H N H N H N H N H N H
ZONE4
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
ZONE 4
PRIORITY
OFF
ON
PRIORITY
24 VAC
COM
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
ZONE
NOT
USED
JUMPER
JUMPER
PRIORITY
ON
PRIORITY
ON
TWO ZONE SWITCHING RELAY
CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2
PRIORITY
ZONE1
ZONE2
PRIORITY
SR 502-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS
120 VAC
ZR
H H N H N H N H
ZONE 2
POWER
ZONE 1
LED
INDICATORS
ZONE 2
PRIORITY
OFF
ON
JUMPER
24 VAC
COM
120 VAC
PRIORITY
OFF
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
14
2 Indirect Water Heaters with Priority Connected to Standard Switching Relays
TO: "TT" ON BOILER
120 VAC INPUT
BOILER
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
TWO ZONE SWITCHING RELAY
CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2
PRIORITY
ZONE1
ZONE2
PRIORITY
SR 502-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
X X
R W
R W
ISOLATED
END
SWITCH
THERMOSTATS
120 VAC
ZR
H H N H N H N H
ZONE 2
POWER
ZONE 1
LED
INDICATORS
ZONE 2
PRIORITY
OFF
ON
JUMPER
24 VAC
COM
DHW CIRCULATORS
PRIORITY
OFF
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
120 VAC INPUT
H
N
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On
Reset/Normal: Normal
MASTER
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
ZONE
NOT
USED
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Normal
SLAVE
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
2 Indirect Water Heaters with Priority Connected to EXP Switching Relays
15
PC700 Boiler Reset Control Connected to SR501-EXP Switching Relay
ZONE
C
ONTROL
B
OIL
SEN
O
UT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
SYSTEM
CIRCULATOR
TO: "TT" ON BOILER
POWER
ZONE 1
LED
INDICATORS
F
USE
6 AMP
F
USE
6 AMP
SR 501-EXP-4
POWER
CONTROLS
SLAVE
P
RIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
P
UMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
O
FF
NORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
HN/O NH
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
X
W
R
X1A 2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
T
HERMOSTAT
T
120 VAC INPUT
H
N
BOILER
To: DHW Aquastat if PC700
Boiler Reset Temperature is
to be overridden during
DHW call.
NOTE 1: Terminals C are for
optional 24V thermostat
C
OMMON connections.
16
F
OUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
O
N
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORS
ZC ZR
X
X
END
SWITCH
POWER
I
NPUT
120 VAC
INPUT
Z
ONE1
Z
ONE2
Z
ONE3
Z
ONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 VAC
POWER
SR 504
ZONE 2
P
OWER
Z
ONE 1
Z
ONE 3
ZONE 4
THERMOSTATS
BOILER
H
N
MASTER
EXISTING
ZONE
CONTROL
T
P
RIMARY
SYSTEM
CIRCULATOR
(Optional)
T
O: "TT" ON BOILER
J
UMPER
D
HW
H
EATER
CIRCULATOR
Note: If Zone Control comes on without a call for heat,
r
everse Reset Override input (1 & 2) wires on SR501-EXP.
ZONE
CONTROL
BOIL
SEN
OUT
SEN
B
OILER SENSOR
OUTDOOR
SENSOR
PC700
SWITCH SETTINGS
Master/Slave: Master
R
eset/Normal: Reset
P
OWER
Z
ONE 1
L
ED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
P
OWER
C
ONTROLS
SLAVE
P
RIORITY ON
R
ESET
PRIMARY PUMP ON
P
OST PURGE ON
P
RIORITY PROTECT ON
P
UMP EXERCISE ON
30 SEC/2 WK
MASTER
O
FF
OFF
O
FF
O
FF
O
FF
N
ORMAL
4 MIN/24 HOUR
ACCESSORY
P
ORT
HN/O NH
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
E
ND
SWITCH
R
ESET
OVERRIDE
T
HERMOSTATEXPANSION
X
W
RX1A2CB
24 VOLTS AC ONLY
C
S
INGLE ZONE
E
XPANDABLE SWITCHING RELAY
INDIRECT
WATER HEATER
A
QUASTAT OR
T
HERMOSTAT
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Switching Relay
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
POWER
INPUT
120 VAC
INPUT
ZONE1 ZONE2 ZONE3 ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 VAC
POWER
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
THERMOSTATS
BOILER
H
N
EXISTING
ZONE
CONTROL
T
TO: "TT" ON BOILER
REMOVE
JUMPER
DHW
HEATER
CIRCULATOR
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
SLAVE
MASTER
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
P
OWER
CONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
HN/O NH
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
O
VERRIDE
THERMOSTATEXPANSION
XWRX1A 2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
Connecting a DHW Heater to an Existing Heating Only Switching Relay
Using an SR501-EXP and PC700 Boiler Reset Control
17
SR501-EXP and PC700 Boiler Reset Control Connected to an Existing Zone Valve Control
120 VAC
INPUT
BOILER
H
N
E
XISTING
Z
ONE
CONTROL
TO: "TT" ON BOILER
DHW HEATER
CIRCULATOR
N
ote: If Zone Control comes on without a call for heat,
reverse Reset Override input (1 & 2) wires on SR501-EXP.
ZONE
CONTROL
B
OIL
SEN
O
UT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
2
4 VAC
P
OWER IN
Z
ONE 2 ZONE 3 ZONE 4
MODE
NORMAL RESET
FUSE
(3 AMP MAX)
Z
ONE 1
TT
TT TT TT
ZONE 4
PRIORITY
O
FF
ON
N/O COM
N/C
ZONE 4 RELAY
1234 1234
ZONE 1 ZONE 2
2
WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3
& 4
TACO
3
WIRE ZONE VALVE
1
2
3
1234
ZONE 3
MOTOR
END
SWITCH
4 WIRE ZONE VALVE
(
POWER OPEN,
SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
T
STAT 4
VALVE 4
P
OWER
END
SWITCH
EXTRA
E
ND
S
WITCH
MAIN
24
V
AC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
W
HITE
BLACK
ZVC 404
FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1234
ZONE 4
PRIORITY
ZONE
J
UMPER
3 & 4
SEE NOTE
THERMOSTATS
T
T
T
Note: When a circulator is used on the
p
riority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
ZONE VALVE SYSTEM
CIRCULATOR
I
NDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
MASTER
P
RIMARY SYSTEM
C
IRCULATOR
(Optional)
SWITCH SETTINGS
M
aster/Slave: Master
Reset/Normal: Reset
POWER
ZONE 1
LED
I
NDICATORS
FUSE
6
AMP
FUSE
6
AMP
SR 501-EXP-4
P
OWER
C
ONTROLS
SLAVE
PRIORITY ON
R
ESET
P
RIMARY PUMP ON
POST PURGE ON
P
RIORITY PROTECT ON
P
UMP EXERCISE ON
3
0 SEC/2 WK
MASTER
OFF
O
FF
OFF
O
FF
O
FF
N
ORMAL
4
MIN/24 HOUR
A
CCESSORY
P
ORT
HN/O NH
1
20 VAC
CIRCULATOR
PRIMARY
O
UTPUT
N/C
INPUT
120 VAC
E
ND
SWITCH
R
ESET
OVERRIDE
T
HERMOSTATEXPANSION
X
W
RX1A2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
120 VAC
INPUT
BOILER
H
N
EXISTING
ZONE
CONTROL
DHW HEATER
CIRCULATOR
TO: "TT" ON BOILER
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
24 VAC
P
OWER IN
ZONE 2 ZONE 3 ZONE 4
MODE
N
ORMAL RESET
FUSE
(3 AMP MAX)
ZONE 1
TT
TT TT TT
ZONE 4
PRIORITY
O
FF
O
N
N
/O COM
N/C
Z
ONE 4 RELAY
1234 1234
ZONE 1 ZONE 2
2 WIRE ZONE VALVE
(NO END SWITCH)
JUMPER
3 & 4
TACO
3 WIRE ZONE VALVE
1
2
3
1234
ZONE 3
MOTOR
END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN,
SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
T STAT 4
VALVE 4
POWER
END
SWITCH
E
XTRA
E
ND
S
WITCH
MAIN
24
V
AC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
I
NPUT
WHITE
BLACK
ZVC 404
FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1234
ZONE 4
PRIORITY
ZONE
JUMPER
3 & 4
SEE NOTE
THERMOSTATS
T
T
T
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
ZONE VALVE SYSTEM
CIRCULATOR
SLAVE
MASTER
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
POWER
C
ONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
HN/O NH
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
T
HERMOSTATEXPANSION
XWRX1A 2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
18
Connecting a DHW Heater to an Existing Heating Only Zone Valve Control
Using an SR501-EXP and PC700 Boiler Reset Control
SR501-EXP and PC702 Boiler Reset Control Connected to an Existing Switching Relay
F
OUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
P
OWER
INPUT
120 VAC
INPUT
ZONE1 ZONE2 ZONE3 ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 VAC
POWER
SR 504
Z
ONE 2
POWER
ZONE 1
Z
ONE 3
Z
ONE 4
THERMOSTATS
H
N
MASTER
EXISTING
ZONE
CONTROL
T
P
RIMARY
S
YSTEM
C
IRCULATOR
(Optional)
JUMPER
D
HW
HEATER
CIRCULATOR
N
ote: If Zone Control comes on without a call for heat,
reverse Reset Override input (1 & 2) wires on SR501-EXP.
SWITCH SETTINGS
Master/Slave: Master
R
eset/Normal: Reset
POWER
Z
ONE 1
LED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
POWER
CONTROLS
S
LAVE
P
RIORITY ON
R
ESET
P
RIMARY PUMP ON
P
OST PURGE ON
P
RIORITY PROTECT ON
P
UMP EXERCISE ON
30 SEC/2 WK
M
ASTER
O
FF
O
FF
O
FF
O
FF
O
FF
N
ORMAL
4 MIN/24 HOUR
A
CCESSORY
PORT
HN/O NH
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
XWRX1A 2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
ZONE
CONTROL
B
OIL
SEN
O
UT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC702
STAGE1STAGE
2
B
OILER
#2
BOILER
#1
DHW
DEMAND
WIRING NEEDED ONLY IF
PRIORITY ZONE IS DHW
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
POWER
INPUT
120 VAC
INPUT
ZONE1 ZONE2 ZONE3 ZONE4
ZONE1 ZONE2 ZONE3 ZONE4
FUSE 1 AMP
24 VAC
POWER
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
THERMOSTATS
BOILER
H
N
EXISTING
ZONE
CONTROL
T
TO: "TT" ON BOILER
SLAVE
MASTER
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
POWER
ZONE 1
LED
INDICATORS
FUSE
6 AMP
FUSE
6 AMP
SR 501-EXP-4
POWER
C
ONTROLS
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
4 MIN/24 HOUR
ACCESSORY
PORT
HN/O NH
120 VAC
CIRCULATOR
PRIMARY
OUTPUT
N/C
INPUT
120 VAC
END
SWITCH
RESET
OVERRIDE
THERMOSTATEXPANSION
XWRX1A 2CB
24 VOLTS AC ONLY
C
SINGLE ZONE
EXPANDABLE SWITCHING RELAY
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC705-2
SUP
SEN
SUPPLY SENSOR
INJECTION
CIRCULATOR
SYSTEM
CIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE B
ON PAGE 22)
PRIMARY
SYSTEM
CIRCULATOR
(Optional)
Note: If Zone Control comes on without a call for heat,
reverse Reset Override input (1 & 2) wires on SR501-EXP.
JUMPER
SR501-EXP and PC705 Variable Speed Pump Injection Control Connected
to an Existing Switching Relay
19
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC700
BOILER
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
H
N
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
20
PC700 Boiler Reset Control Connected to EXP Switching Relay
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC702
STAGE
1
STAGE
2
BOILER
#2
BOILER
#1
DHW
DEMAND
WIRING NEEDED ONLY IF
PRIORITY ZONE IS DHW
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
H
N
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
PC702 2–Stage Boiler Reset Control Connected to EXP Switching Relay
21
TO: "TT" ON BOILER
BOILER
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC705-2
SUP
SEN
SUPPLY SENSOR
INJECTION
CIRCULATOR
SYSTEM
AND/OR BOILER
CIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE B)
NOTE A: WHEN SYSTEM CIRCULATOR IS CONNECTED TO PRIMARY CIRCULATOR TERMINAL ON SWITCHING RELAY,
THE PRIMARY PUMP DIP SWITCH SETS OPERATION OF THIS OUTPUT.
NOTE B: WHEN SYSTEM CIRCULATOR IS CONNECTED TO RED WIRE ON PC705-2, THE CIRCULATOR WILL OPERATE ONLY WHEN THERMOSTAT CALLS FOR HEAT
AND THE OUTDOOR TEMPERATURE IS BELOW THE WARM WEATHER SHUT DOWN (WWSD) TEMPERATURE. THE WWSD CAN BE ADJUSTED OR TURNED
OFF SO THAT THE CIRCULATOR IS NOT AFFECTED BY OUTDOOR TEMPERATURE.
SYSTEM
AND/OR BOILER
CIRCULATOR
(SEE NOTE A)
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1
ZONE 2 ZONE 3 ZONE 4
ZONE1
ZONE2
ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X X
X X
A B
C R W
C R W
C R W
C R W
C
1 2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H N H N H N H N H N H N H
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
H
N
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
22
PC705 Variable Speed Pump Injection Control Connected to EXP Switching Relay
PC700 Boiler Reset Control Connected to 2 EXP Switching Relays
Z
ONE
CONTROL
B
OIL
SEN
O
UT
SEN
BOILER SENSOR
O
UTDOOR
SENSOR
PC700
BOILER
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
P
OWER
CONTROLS
1
20 VAC CIRCULATORS
Z
C
INPUT
1
20 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
T
HERMOSTATS
SR 504-EXP-4
F
USE
6 AMP
FUSE
6 AMP
F
USE
6 AMP
F
USE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X
X
X
X
A
B
C
RW
C
RW
C
RW
C
RW
C
1
2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
P
RIMARY
120 VAC
Z
R
HHNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
R
ESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
P
RIORITY
ACCESSORY
P
ORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
P
RIMARY SYSTEM
CIRCULATOR
(
OPTIONAL)
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Normal
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XXABCRW
CRW
CRW
CRWC12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
H
N
MASTER
SLAVE
See NOTE 1
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
23
PC702 2–Stage Boiler Reset Control Connected to 2 EXP Switching Relays
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
Z
ONE1
Z
ONE2
Z
ONE3
THERMOSTATS
SR 504-EXP-4
F
USE
6 AMP
FUSE
6 AMP
F
USE
6 AMP
F
USE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X
X
X
X
A
B
C
RW
C
RW
C
RW
C
RW
C
1
2
END SWITCH THERMOSTATS (24 VAC)
P
RIORITY
N
/C
PRIMARY
120 VAC
ZR
H
HNHNHNHNHNHNH NH
S
LAVE
PRIORITY ON
RESET
P
RIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
P
UMP EXERCISE ON
30 SEC/2 WK
M
ASTER
OFF
O
FF
OFF
OFF
O
FF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
Z
ONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Normal
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX XX ABCRWCRWCRWCRWC 12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
H
N
MASTER
SLAVE
ZONE
CONTROL
BOIL
SEN
OUT
SEN
B
OILER SENSOR
O
UTDOOR
SENSOR
PC702
STAGE1STAGE
2
BOILER
#2
BOILER
#1
DHW
D
EMAND
WIRING NEEDED ONLY IF
PRIORITY ZONE IS DHW
P
RIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
See NOTE 1
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
24
PC705 Variable Speed Pump Injection Control Connected to 2 EXP Switching Relays
120 VAC INPUT
SWITCH SETTINGS
M
aster/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
P
OWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
F
USE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
F
USE
6 AMP
F
USE
6 AMP
NET
EXPANSIONMAIN PRIORITY
X
X
X
X
A
B
C
RW
C
RW
C
RW
C
RW
C
1
2
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
P
RIMARY
120 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
P
ORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Normal
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
C
ONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XXABCRW
CRW
CRW
CRWC12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
P
RIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
H
N
MASTER
SLAVE
T
O: "TT" ON BOILER
BOILER
ZONE
C
ONTROL
BOIL
S
EN
OUT
S
EN
BOILER SENSOR
OUTDOOR
SENSOR
PC705-2
SUP
S
EN
SUPPLY SENSOR
INJECTION
CIRCULATOR
SYSTEM
CIRCULATOR
B
LACK
BLUE
RED
G
REEN/GROUND
(
SEE NOTE B
ON PAGE 22)
(SEE NOTE A
O
N PAGE 22)
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
See NOTE 1
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
25
PC700 and PC705 Controls Connected to 2 EXP Switching Relays
120 VAC INPUT
SWITCH SETTINGS
M
aster/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
1
20 VAC CIRCULATORS
Z
C
I
NPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XXABCRW
CRW
CRW
CRWC12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
A
CCESSORY
PORT
ZONE 2
P
OWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
120 VAC INPUT
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XX
AB
CRW
CRW
CRW
CRWC12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
O
FF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
T
H
N
MASTER
SLAVE
T
O: "TT" ON BOILER
BOILER
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC705-2
SUP
SEN
SUPPLY SENSOR
INJECTION
CIRCULATOR
SYSTEM
CIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE B
ON PAGE 22)
ZONE
CONTROL
BOIL
SEN
OUT
SEN
B
OILER SENSOR
O
UTDOOR
S
ENSOR
PC700
(SEE NOTE A
ON PAGE 22)
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)
S
ee NOTE 1
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
26
1
20 VAC INPUT
SWITCH SETTINGS
Master/Slave: Master
Priority Zone: On or Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
P
OWER
C
ONTROLS
120 VAC CIRCULATORS
Z
C
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
F
USE
6 AMP
FUSE
6 AMP
F
USE
6 AMP
F
USE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XXABCRW
CRW
CRW
CRWC12
END SWITCH THERMOSTATS (24 VAC)
P
RIORITY
N
/C
PRIMARY
120 VAC
ZR
H
HNHNHNHNHNHNH NH
SLAVE
PRIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
3
0 SEC/2 WK
MASTER
O
FF
OFF
OFF
OFF
OFF
NORMAL
LOW LIMIT (ZC) ON OFF
4
MIN/24 HOUR
ZONE4 ZONE4
P
RIORITY
A
CCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
Z
ONE 4
LED
INDICATORS
T
SWITCH SETTINGS
Master/Slave: Slave
Priority Zone: Off
Reset/Normal: Reset
FOUR ZONE
EXPANDABLE
SWITCHING RELAY
P
OWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4
ZONE1 ZONE2 ZONE3
THERMOSTATS
SR 504-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX XX ABCRWCRWCRWCRWC 12
END SWITCH THERMOSTATS (24 VAC)
PRIORITY
N/C
PRIMARY
120 VAC
ZR
HHNHNHNHNHNHNH NH
SLAVE
P
RIORITY ON
RESET
PRIMARY PUMP ON
POST PURGE ON
PRIORITY PROTECT ON
PUMP EXERCISE ON
30 SEC/2 WK
MASTER
OFF
OFF
OFF
OFF
OFF
N
ORMAL
LOW LIMIT (ZC) ON OFF
4 MIN/24 HOUR
ZONE4 ZONE4
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
LED
INDICATORS
MASTER
SLAVE
Z
ONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
O
UTDOOR
S
ENSOR
PC702
S
TAGE
1
S
TAGE
2
BOILER
#2
BOILER
#1
DHW
DEMAND
WIRING NEEDED ONLY IF
PRIORITY ZONE IS DHW
120 VAC INPUT
H
N
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC705-2
SUP
SEN
SUPPLY SENSOR
INJECTION
CIRCULATOR
SYSTEM
CIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
(SEE NOTE B
ON PAGE 22)
T
P
RIMARY SYSTEM
CIRCULATOR
(
OPTIONAL)
See NOTE 1
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
See NOTE 1
PC702 and PC705 Controls Connected to 2 EXP Switching Relays
27
BOILER
H
N
SYSTEM
PUMP
SYSTEM PUMP AND BOILER TURN ON
WHEN ANY ZONE VALVE OPENS.
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 5
1 2 3 4
ZONE 6
PRIORITY
ZONE
2 WIRE ZONE VALVE
(NO END SWITCH)
MUST USE JUMPER
TACO
3 WIRE
ZONE VALVE
123
JUMPER
3 & 4
MOTOR END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN,
SELF CLOSING)
JUMPER
3 & 4
ZVC 406 – 4
SIX ZONE
ZONE VALVE CONTROL
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
POWER IN
24 VAC
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
DRY
CONTACTS
N/O
COM
N/C
PUMP END
SWITCH
ZONE 6 PUMP
END SWITCH
THERMOSTATS (24VAC)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
T STAT 4
VALVE 4
VALVE 5
T STAT 6
VALVE 6
POWER
LED
INDICATORS
T STAT 5
TO: BOILER AQUASTAT RELAY
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ISOLATED
X X
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
X X
ZONE 6
PRIORITY
OFF
ON
NOTE 2: When a circulator
is used on the priority zone
instead of a zone valve,
jumper 3 and 4 of the
priority zone.
FUSE
5 AMP
R W
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
See NOTE 1
R W
R W R WC C C
R W
C
C
FUSE
5 AMP
R W
C
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
Powered from Transformer A Powered from Transformer B
A
B
Powered from Transformer A Powered from Transformer B
T T
T
ZVC403/404/405/406 with System Pump
28
BOILER
H
N
DHW
PUMP
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 5
1 2 3 4
ZONE 6
PRIORITY
ZONE
2 WIRE ZONE VALVE
(NO END SWITCH)
MUST USE JUMPER
TACO
3 WIRE
ZONE VALVE
123
JUMPER
3 & 4
MOTOR END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN,
SELF CLOSING)
JUMPER
3 & 4
ZVC 406 – 4
SIX ZONE
ZONE VALVE CONTROL
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
POWER IN
24 VAC
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
N/O
COM
N/C
PUMP END
SWITCH
ZONE 6 PUMP
END SWITCH
THERMOSTATS (24VAC)
T STAT 1
VALVE 1
T STAT 2
VALVE 2
T STAT 3
VALVE 3
T STAT 4
VALVE 4
VALVE 5
T STAT 6
VALVE 6
POWER
LED
INDICATORS
T STAT 5
TO: BOILER AQUASTAT RELAY
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
ISOLATED
X X
END SWITCH THERMOSTATS (24 VAC) PRIORITY
24 VAC ZONE VALVES
PRIORITY
X X
ZONE 6
PRIORITY
OFF
ON
NOTE 2: When a circulator
is used on the priority zone
instead of a zone valve,
jumper 3 and 4 of the
priority zone.
FUSE
5 AMP
R W
INDIRECT
WATER HEATER
AQUASTAT OR
THERMOSTAT
See NOTE 1
R W
R W R WC C C
R W
C
C
FUSE
5 AMP
R W
C
NOTE 1: Terminals C are for
optional 24V thermostat
COMMON connections.
Powered from Transformer A Powered from Transformer B
A
B
Powered from Transformer A Powered from Transformer B
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
T T
T
ZVC403/404/405/406 with Domestic Hot Water (DHW) Pump
29
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