Tekmar Switching Relay 303P – Three Zone
$414.42
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 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™ signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency.
Technical Information
303P Installation and Operation Manual
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™, 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
| Control | Microprocessor control. This is not a safety (limit) control. |
| Packaged weight | 2.5 lb. (1125 g) |
| Dimensions | 6-11/16″ H x 4-15/16″ W x 2-7/16″ D (169 x 123 x 62 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, 5 A |
| Transformer | 24 V (ac), 20 VA |
| Control load | 7.5 VA |
| Fuse | T5A 250 V slow blow, spare fuse included |
| Pump relay | 230 V (ac), 5 A, 1/3 hp |
| Boiler XX end switch | 24 V (ac), 5 A |
| Warranty | Limited 3 Year Warranty |
| Weight | 1.125 kg |
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