The Switching Relay 302P connects up to two thermostats and operates circulators to provide heating to a zoned hydronic heating system. Zone 1 has optional priority over zone 2 and can be used to provide heat to an indirect domestic hot water tank. The 302P 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 302P provides a RoomResponse™ signal to modulating-condensing boilers to optimize comfort while improving boiler efficiency.
- Submittal Sheet
- Installation
Features
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Away signal shared between tekmar thermostats
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CSA approved
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Compatible with all low voltage thermostats
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Four ground screws
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Fuses protect transformers and pumps
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LED for each zone, priority, end switch and RoomResponse™
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Post purge
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Priority override
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Pump exercising
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RoomResponse™ signal
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Top, bottom and back conduit knockouts
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Two spare fuses included
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Unlimited zone expansion
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Zone priority
Specifications
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, 11 A |
Transformer | 40 VA at 24 V (ac), expandable to 80 VA with additional transformer M3069 (sold separately) |
Fuses | T5A 250 V slow blow 5 x 20 mm glass fuse, two spare fuses included |
Control load | 7 VA at 24 V (ac) |
Pump relays | 115 V (ac), 5 A, 1/3 hp, 11 A combined |
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 1 kΩ max load impedance | |
Warranty | Limited 3 Year Warranty |