Submittal Sheet
Job __________________________
Designer ______________________
Contact _______________________
304P
_
C
11/16
Zoning
Replaces: 10/16
Switching Relay 304P
Submittal
© 2016 tekmar 304P
_
C - 11/16 1 of 2
Features
--------------------------
• RoomResponse
TM
signal (Patent Pending)
• Compatible with all low voltage thermostats
• Unlimited zone expansion
• Zone priority
• Priority override
• Pump exercising
• Post purge
• LED for each zone, priority, end switch and
RoomResponse
TM
• Away signal shared between tekmar
thermostats
• Four ground screws
• Top, bottom and back conduit knockouts
• Fuses protect transformers and pumps
• Two spare fuses included
• CSA approved
Specifications
-----------------------------------------------------
The Switching Relay 304P connects up to four thermostats and operates circulators to provide heating to a zoned hydronic
heating system. Zone 1 has optional priority over zones 2 through 4 and can be used to provide heat to an indirect domestic
hot water tank. The 304P includes optional exercising to prevent circulator seizure when not in use, and optional post
purge operation of the last operating zone to maximize energy savings. The 304P provides a RoomResponse
TM
signal to
modulating-condensing boilers to optimize comfort while improving boiler efficiency.
Switching Relay 304P Four Zones with Priority
Literature 304P_C, 304P_D, 304P_J
Control Microprocessor control. This is not a safety (limit) control.
Packaged weight 5.0 lb. (2250 g)
Dimensions 8-3/16" H x 10-11/16" W x 2-3/8" D (208 x 271 x 60 mm)
Enclosure Cover: ABS plastic, Base: galvanized steel, NEMA type 1
Approvals
CSA C US
Ambient conditions Indoor use only, 32 to 122°F (0 to 50°C), RH ≤90% non-condensing
Power supply 115 V (ac) ±10%, 60 Hz, 20 A
Transformer
40 VA, expandable to 80 VA with additional transformer
M3069 (sold separately)
Control load 7 VA
Fuses T5A, 250 V slow blow, two spare fuses included
Pump relays 230 V (ac), 5 A, 1/3 hp
Boiler XX end switch
24 V (ac), 5 A
DHW end switch
24 V (ac), 5 A
Mod boiler output
0-10 V (dc) 500 Ω min load impedance
4-20 mA 1kΩ max load impedance
Warranty Limited 3 Year (See 304P_D for full warranty)
Front View Side View Inside View
8–3/16"
(208 mm)
6–7/16"
(164 mm)
10-11/16"
(271 mm)
1/2" (22 mm) knockout
∅ 3/16"
(4 mm)
2-3/8"
(60 mm)
MOD
X X
tN4
T1 T2 T3 T4 T5 T6
A
DHW C R W
BOILER T-STAT 1 T-STAT 2 T-STAT 3
-
+
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
FUSE 2 FUSE 1
END
SWITCH
MOTOR
POWER
PRIORITY SYS PUMP
ROOM
RESPONSE
ZONE 1
70 80
9060
50 100
MOD MAX %
END
SWITCH
MOTOR
ZONE 2
END
SWITCH
MOTOR
ZONE 3
END
SWITCH
MOTOR
ZONE 4
END
SWITCH
MOTOR
ZONE 5
END
SWITCH
MOTOR
ZONE 6
MASTER MEMBER
OFF
OFF
OFF
T-STAT 1 PRIORITY : 0N
EXERCISING : ON
POST PURGE : ON
MOD BOILER : 0-10V
SYSTEM PUMP DURING PRIORITY: ON
SYSTEM PUMP WITH MEMBER CALL: ON
ZONE VALVE END SWITCHES: ON
RESERVED
120 VAC
POWER PUMP PUMP 1
SYSTEM PRIORITY
L N L N L N
OFF
OFF
OFF
4-20 mA
9"
(229 mm)
RoomResponse
TM
Power
Priority
Zone 1Zone 2Zone 3Zone 4
Switching Relay 304P
Four Zones with Priority
H3020A