CH
Pump
CH
Pump
CH
Pump
DHW
Pump
DHW
Sensor
or
Aquastat
Sy stem
Sensor
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORITYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORS INPU T
12 0 VAC
INPU T
12 0 VAC
INPU T
12 0 VAC
HHNN
INPU T
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
FU SE
6 AM P
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS INPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
Leader
B1
Follower
B2
Follower
B3
PIPING
3 EXALT BOILERS CASCADED
*Pump Setting Changes Needed With This Configuration
*(ON)
*Pump Settings Need To Be Changed On All Boilers