22
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELA
Y
FUSE 1 AMP
24 V
A
C
POWER
MASTER
1234
PLUG-IN CARDS
RESET NORMAL
SLA
VE
POWER
CONTROL
INTERF
ACE
THERMOST
A
T
S
ZONE 1
ZONE 2
ZONE 3
ZONE 4
120 V
AC INPUT
120 VOL
T CIRCULA
TORS
ZC ZR
X X
END
SWITCH
ZONE1
ZONE2
ZONE3
ZONE4
POWER
INPUT
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
JUMPER
H
N
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC702
ST
AGE
1
ST
AGE
2
BOILER
#2
BOILER
#1
DHW
DEMAND
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Normal
Priority Zone: On or Off
SR 504-EXP
WIRING NEEDED ONLY IF
PRIORITY ZONE IS DHW
SYSTEM
CIRCULATOR
(OPTIONAL)
T
P
C70
2 2–St
age Boiler R
eset Contr
ol Connected to E
XP Switc
hing R
elay