S
R
50
1-E
XP Switc
hing R
elay Contr
olling a Z
VC
404/4
06
Zone V
alve Contr
ol
24 V
A
C
ZONE 1
Z
ONE 2
ZONE 3
ZONE 4
Z
ONE 5
ZONE 6
MODE
NORMAL
RESET
FUSE (7 AMP MAX)
TT
TT
TT
TT
TT
TT
ZONE 6 PRIORITY
OFF
ON
ZVC 406
12
34
12
34
12
34
12
34
12
34
ZONE 1
ZONE 2
ZONE 3
ZONE 4
Z
ONE 5
2 WIRE ZONE V
A
LV
E
(NO END SWITCH)
JUMPER
3 & 4
T
ACO
3 WIRE
ZONE
V
A
L
V
E
1
2
3
MOTOR
END
SWITCH
THERMOSTAT
THERMOSTAT
THERMOSTAT
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
T STAT 5
VALVE 5
T STAT 6
VALVE 6
POWER
SIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
POWER IN
24 VAC
FACTORY
INSTALLED
TRANSFORMER
120 VAC
INPUT
WHITE
BLACK
N/O
COM
ZONE 6 RELAY
END
SWITCH
EXTRA
END
SWITCH
MAIN
N/C
TO BOILER AQUASTAT RELAY
BOILER
H
N
SYSTEM
PUMP
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.
12
34
ZONE 6
PRIORITY
ZONE
JUMPER 3 & 4
SEE NOTE
Note: When a circulator is used on the
priority zone instead of a zone valve,
jumper 3 and 4 of the priority zone.
TT
T
120 VAC
INPUT
DHW
HEATER
CIRCULATOR
POWER
T STAT
AQUASTAT ON
DHW HEATER
NZ
C
Z
R
HH
H
POWER
INPUT
120VAC
INPUT
120VAC
OUTPUT
CIRC
OUTPUT
PRIORITY
OUTPUT
RESET
POWER
CONTROLS
FUSE
1 AMP
NORMAL
MASTER
SLAVE
END
SWITCH
ZONE
VALVE
THERMOSTAT
EXPANSION
X
COM
T/W
T/R
X1
1
22
4
3
JUMPER
TO: OPTIONAL ZONE VALVE
OR iSeries MIXING VALVE
MODE
FUSE
5 AMP
SR 501-EXP
A
TO BOILER AQUASTAT RELAY
MASTER
SLAVE
SYSTEM PUMP TURNS ON WHEN ANY ZONE VALVE OPENS
EXCEPT WHEN THE DHW HEATER (SR501-EXP) CALLS.
13