S
R
50
2/5
03
Switc
hing R
elay Contr
olling 2 S
R
504/5
06
Switc
hing R
elays
ZONE 4
ON
OFF
PRIORITY
120V RELA
Y
FUSE 1 AMP
ZONE 1
ZONE 2
ZONE 3
ZONE 4
120 VOL
T CIRCULA
TORS
ZC ZR
X X
END
SWITCH
ZONE1
ZONE2
ZONE3
ZONE4
POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
T
T
T
BOILER
ZONE 4
ON
OFF
PRIORITY
120V RELA
Y
FUSE 1 AMP
24 VAC
POWER
ZONE 1
Z
ONE 2
ZONE 3
ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOL
T CIRCULA
TORS
ZC ZR
X X
END
SWITCH
ZONE1
ZONE2
ZONE3
ZONE4
POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
T
T
T
H
N
A
SR 503
ZONE1
ZONE2
ZONE3
24 V
A
C
POWER
FUSE 1 AMP
ZONE1
ZONE2
ZONE3
JUMPER
N P ZC H X ZR
1
X
2
ZONE 2
POWER
ZONE 1
TWO ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
PRIORITY
ON
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
MASTER
SLAVE
SLAVE
PRIORITY
OFF
PRIORITY
OFF
T
T
T
T
24 VAC
POWER
ZONE 3
REMOVE
JUMPER
REMOVE
JUMPER
AQUASTAT ON
DHW HEATER
10