303P
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Part of the Zone Controls Series
Ordering Code: 303P
UPC: 779655030303
Switching Relay, Three Zones with Priority
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 |
| Markets | Multifamily Homes, Single-Family Homes, Small Commercial Buildings |
| 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 |