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
THERMOST
A
T
S
ZONE 1
ZONE 2
ZONE 3
ZONE 4
120 V
AC INPUT
TO: "TT" ON BOILER
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
BOILER
SWITCH SETTINGS
Master/Slave: Master
Reset/Normal: Reset
Priority Zone: On or Off
ZONE
CONTROL
BOIL
SEN
OUT
SEN
BOILER SENSOR
OUTDOOR
SENSOR
PC705-2
SUP
SEN
SUPPL
Y
SENSOR
INJECTION
CIRCULATOR
SYSTEM
CIRCULATOR
AND/OR BOILER
BLACK
BLUE
RED
GREEN/GROUND
SR 504-EXP
(SEE NOTE B)
NOTE A:
WHEN SYSTEM CIRCULATOR IS CONNECTED TO ZR TERMINAL ON SWITCHING RELAY, THE MODE SWITCH MUST BE SET TO NORMAL.
THE PC705-2 WILL NOT RESET THE BOILER WHEN IN THE NORMAL MODE.
NOTE B:
WHEN SYSTEM CIRCULATOR IS CONNECTED TO RED WIRE ON PC705-2, THE CIRCULATOR WILL OPERATE ONLY WHEN THERMOSTAT CALLS FOR H
EAT
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
CIRCULATOR
AND/OR BOILER
(SEE NOTE A)
T
23
P
C70
5 V
ar
iable Speed P
ump Injection Contr
ol Connected to E
XP Switc
hing R
elay