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Application 302P-1
Mechanical
Electrical
The Switching Relay 302P operates the circulators for two heating zones when the corresponding thermostat calls for
heat. The boiler is fired whenever a zone calls for heat.
B1
302P
P1
P2
Legend
B1 = Boiler
P1, P2 = Zone 1 and 2 Pumps
T1 = WiFi Thermostat 561, 562 or 563
T2 = Generic Digital Power-Stealing Thermostat
DIP Switches
Master
T-stat 1 Priority Off
Exercising On
Post Purge On
Mod Boiler - not applicable
Away
C R Rh W
R W
70
FUSE 2
FUSE 7
FUSE 8
FUSE 3
FUSE 4
FUSE 5
FUSE 6
70 80
90
60
50
100
MOD MAX %
MASTER
MEMBER
OFF
OFF
OFF
4-20 mA
T-STAT 1 PRIORITY : 0N
EXERCISING : ON
POST PURGE : ON
MOD BOILER : 0-10V
RESERVED
FUSE 1
120 VAC
POWER
MOD
X X
tN4
POWER
ROOM
RESPONSE
T1
T2
T3
T4
T5
T6
A
DHW
C R W
BOILER
T-STAT 1
T-STAT 2
T-STAT 3
PRIORITY
PUMP 1
PUMP 2
PUMP 3
PUMP 4
PUMP 5
PUMP 6
L
-
+
N
L
N
L
N
L
N
L
N
L
N
L
N
tN4
A C R W
tN4
A C R W
T-STAT 4
tN4
A C R W
T-STAT 5
tN4
A C R W
T-STAT 6
EXPANSION
tN4
A C R W
tN4
A B C D E
B1
T1
T2
P1
P2
L N
The 302P includes
internal circuitry
to support power
stealing thermostats.
External resistors are
not required.
