User Guide

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Application 302P-3
Mechanical
Electrical
Two Switching Relay’s operate six heating zone circulators. The two controls are connected together using an expansion
bus wire. The master 302P fires the boiler when any zone calls for heat. If priority is selected, zones 2 through 6 shut
off when zone 1 is calling for heat.
DIP Switches
Master
T-stat 1 Priority On
Exercising On
DIP Switches
Member
T-stat 1 Priority Off
Exercising On
The 302P includes
internal circuitry
to support power
stealing thermostats.
External resistors are
not required.
Legend
A1 = DHW Tank Aquastat
B1 = Modulating Condensing Boiler
BP = Boiler Pump
P1 = Zone 1 DHW Tank Pump
A1
Expansion
B1
P1
P2
P3 P4
P5
P6
BP
302P 304P
Away C R Rh W
70
Away C R Rh WAway C R Rh W R W R W
FUSE 2
FUSE 7
FUSE 8
FUSE 3FUSE 4FUSE 5
FUSE 6
70 80
9060
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
XX
tN4
POWER ROOM
RESPONSE
T1 T2 T3 T4 T5 T6
A
DHW CRW
BOILER T-STAT 1 T-STAT 2 T-STAT 3
PRIORITY
PUMP 1
PUMP 2PUMP 3PUMP 4PUMP 5PUMP 6
L
-
+
NLNL NLNLNLNLN
tN4
A
CRW
tN4
A
C RW
T-STAT 4
tN4
A
C RW
T-STAT 5
tN4
A
C RW
T-STAT 6 EXPANSION
tN4
A
C RW
tN4
A
BCDE
FUSE 2
FUSE 7
FUSE 8
FUSE 3FUSE 4FUSE 5
FUSE 6
70 80
9060
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
XX
tN4
POWERROOM
RESPONSE
T1 T2 T3 T4 T5 T6
A
DHW CRW
BOILER T-STAT 1 T-STAT 2 T-STAT 3
PRIORITY
PUMP 1
PUMP 2PUMP 3PUMP 4PUMP 5PUMP 6
L
-
+
NLNLNLNLNLNLN
tN4
A
CRW
tN4
A
C RW
T-STAT 4
tN4
A
C RW
T-STAT 5
tN4
A
C RW
T-STAT 6 EXPANSION
tN4
A
C RW
tN4
A
BCDE
+TT -
B1
P1 P5
L
L
N
N
P2 P6P3 P4
A1
T1
T4 T5T2 T3
Post Purge On
Mod Boiler - depends on
boiler
Post Purge On
Mod Boiler - not applicable
P2 to P6 = Zone 2 through 6 Pump
T1 = WiFi Thermostat 561, 562 or 563
T2, T3 = Thermostat 518 or 519
T4 = Generic Power-Stealing Thermostat
T5 = Generic Bi-Metallic Strip Thermostat