303P

303P

Part of the Zone Controls Series

Ordering Code: 303P

UPC: 779655030303

Switching Relay, Three Zones with Priority

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tekmar Home

The Switching Relay 303P connects up to three thermostats and operates circulators to provide heating to a zoned hydronic heating system. Zone 1 has optional priority over zones 2 and 3 and can be used to provide heat to an indirect domestic hot water tank. The 303P 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 303P provides a RoomResponse(TM) signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency.

Features

RoomResponse signal, compatible with all low voltage thermostats
Unlimited zone expansion, zone priority
Priority override, pump exercising
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
Agency Approvals	CSA C US
Ambient Conditions	Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH less than or equal to 90 percent non-condensing
Control Load	7 VA
Control Type	Microprocessor control, this is not a safety (limit) control
Dimensions	8-3/16" H x 10-11/16" W x 2-3/8" D (208 x 271 x 60 mm)
Enclosure Material	Cover: ABS plastic, Base: galvanized steel
Enclosure NEMA Rating	NEMA 1
Power Supply	115 V (ac) plus / minus 10 percent, 60 Hz, 11 A
Pump Relay	115 V (ac), 5 A, 1/3 hp, 17.3 A combined

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