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© 2018 tekmar 304P_D - 12/18
Application 304P–1
Mechanical
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Electrical
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Legend
B1 = Boiler
P1 to P4 = Zone 1 through 4 Pumps
T1 = WiFi Thermostat 561 or 562
T2 = Thermostat 518 or 519
T3 = Generic Digital Power-Stealing Thermostat
T4 = Generic Bi-Metallic Strip Thermostat
B1
P1
304P
P2
P3
P4
DIP Switches
Master
T-stat 1 Priority Off
Exercising On
Post Purge On
Mod Boiler - not applicable
Away
C R Rh W
Away
C R Rh W
R 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
T3
T4
P1
P2
P3
P4
L N
The Switching Relay 304P operates the circulators for four heating zones when the corresponding thermostat calls for heat.
The boiler is fired whenever a zone calls for heat.
