Submittal Sheet

Job __________________________
Designer ______________________
Contact _______________________
© 2019 tekmar 303V
_
C - 09/19
303V_C
Submittal
Features
• RoomResponse
TM
signal (Patent Pending)
• Compatible with all low voltage thermostats
• Compatible with 2, 3 and 4-wire zone valves
• 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
Zone Valve Control 303V Three Zones with Priority
Literature
Submittal 303V_C, Installation Manual 303V_D,
Job Record 303V_J
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, RoHS
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, 11 A
Transformer
40 VA at 24 V (ac), expandable to 80 VA with additional
transformer M3069 (sold separately)
Control load 7 VA at 24 V (ac)
Fuses
T5A 250 V slow blow 5 x 20 mm glass fuse,
two spare fuses included
Zone valve outputs
24 V (ac), 2 A max each, one transformer 33 VA,
two transformers 73 VA
Zone valve end switch 24 V (ac)
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 3 Year Limited Warranty
The Zone Valve Control 303V connects up to three thermostats and operates zone valves to provide heating to a zoned hydronic heating
system. The 303V operates a system pump whenever a zone valve opens. Zone 1 can operate either a zone valve or a circulator to
provide heat to an indirect domestic hot water tank with optional priority over zones 2 and 3. The 303V includes optional exercising
to prevent circulator seizure when not in use, and optional post purge operation of the domestic hot water tank to maximize energy
savings. The 303V provides a RoomResponseTM signal to modulating-condensing boilers to optimize comfort while improving boiler
efficiency.
Zone Valve Control 303V
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)
Call
Valve
Open
Zone Valve Control 303V
Three Zones with Priority
H3026A
Power
Priority
System
Pump
Zone 1
Zone 2 Zone 3
RoomResponse
TM