Wiring Guide
55
SR503-EXP Switching Relay Controlling a Standard (Non-Expandable) Switching Relay
120 VOLT CIRCULATORS
ZC ZR
X X
ISOLATED
END SWITCH
120 VOLT
INPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1
ZONE2
ZONE3
ZONE4
ZONE5
ZONE6
PRIORITY
REMOVE
JUMPER
H N H N H N H N H N H N
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
PRIORITY
SPARE
FUSE
120V RELAY
SPARE
FUSE
SIX ZONE
SWITCHING RELAY WITH PRIORITY
ZONE 6
PRIORITY
ON
OFF
N H
SR 506
24 VAC
POWER
120 VAC INPUT
TO: "TT" ON BOILER
TO: "TT" ON BOILER WITH
DHW "TT" INPUT
THREE ZONE
EXPANDABLE SWITCHING RELAY
POWER
CONTROLS
120 VAC CIRCULATORS
ZC
INPUT
120 VAC
ZONE 1 ZONE 2 ZONE 3
ZONE1
ZONE2
THERMOSTATS (24 VAC)
SR 503-EXP-4
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
FUSE
6 AMP
NET
EXPANSIONMAIN PRIORITY
XX
XX
AB
C
RW
CRW
CRW
C
12
END SWITCH THERMOSTATS
PRIORITY
N/C
PRIMARY
120 VAC
ZR
H H N H NH NH NH NH 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
ZONE3 ZONE3
PRIORITY
ACCESSORY
PORT
ZONE 2
POWER
ZONE 1
ZONE 3
LED
INDICATORS
THERMOSTATS
(24 VAC)
BOILER
MASTER
SLAVE
AQUASTAT ON
DHW HEATER
A
H
N
(EXISTING CONTROL)
PRIMARY SYSTEM
CIRCULATOR
(OPTIONAL)