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Integral transformer provides low voltage power for control Circuit | switching relay provides dpst switching for hydronic zone controlled heating systems or spot control of two separate loads. One load must be lineage; the other may be either line or lowage. - manufacturer: Honeywell
From the Manufacturer
Switching Relay provides DPST switching for hydronic zone controlled heating systems or SPST control of two separate loads. One load must be line voltage; the other may be either line or low voltage. The R845A may be directly controlled by any 2-wire series 80 thermostat, such as the T86A Round Thermostat or T852A Electric Clock Thermostat
Don G
2025-08-24 18:40:10
I couldn't find it at my local plumbing supply.
Poppa W., Juneau Alaska
2025-08-09 11:43:46
all is A-OK
Karen L Smith
2025-07-31 17:15:02
Correct product. Worked great
Judy Kochersperger
2025-07-29 16:26:13
Works as it should
Peter G.
2025-07-25 10:21:05
Advertised as a Honeywell part, what was received is an off brand imitation.
JAM
2025-07-13 14:43:03
So far, so good. It was easy to hook up and works as advertised in my water stove hydronic heating system.
Ray Ghigliotty
2025-06-06 12:24:54
To be clear-the unit works just fine. Instructions were a little confusing. Contacted Honeywell CS via instant message. After explaining I was looking for clarity on how to wire the unit and going through the details, the rep tells me Honeywell will only help contractors. Literally the dumbest response ever. I wired it up and it worked fine, but their customer support would get zero starts.
walter
2025-01-17 10:05:35
I installed this and it ran great for a week or so now I hear the whining. At first It was dead quiet and I was happy. Now it’s starting to whine and I hope it’s not going to fail on me.
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