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Thread: Different bypass rad according to time of day (zone with T87RF only)

  1. #1
    Automated Home Jr Member
    Join Date
    Jan 2018
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    23

    Default Different bypass rad according to time of day (zone with T87RF only)

    Can you set up a zone that only has a T87RF and no HR92?

    Has anyone got experience with this? Will it (as I hope) still cause the controller to call for heat via the BDR91?

    The reason why I want to do this is to set a bypass radiator according to the time of day.

    Zone 1: Main room of house - Control unit as thermometer - 2 rads, 1 with HR92, one with a timed TRV
    Zone 2: Bed room (with external walls that gets cold very easily) - T87RF as thermometer - 1 rad with a timed TRV

    Using a timed (programmable) TRV, I can set a radiator to bypass mode (i.e. T=28C on TRV) or closed (T=5C). During the day/evening, I would have the Zone 1 rad open (acting as a bypass rad), during evening/nighttime I would open Zone 2.

    If I can't set up Zone 2 as above, I will have a HR92 that is not connected to any radiator.

    Anyway, before I 'break' my existing setup I thought I'd check with anyone who had any experience to share...

  2. #2
    Automated Home Guru
    Join Date
    Nov 2015
    Posts
    143

    Default

    Quote Originally Posted by zxdavb View Post
    Can you set up a zone that only has a T87RF and no HR92?

    Has anyone got experience with this? Will it (as I hope) still cause the controller to call for heat via the BDR91?

    The reason why I want to do this is to set a bypass radiator according to the time of day.

    Zone 1: Main room of house - Control unit as thermometer - 2 rads, 1 with HR92, one with a timed TRV
    Zone 2: Bed room (with external walls that gets cold very easily) - T87RF as thermometer - 1 rad with a timed TRV

    Using a timed (programmable) TRV, I can set a radiator to bypass mode (i.e. T=28C on TRV) or closed (T=5C). During the day/evening, I would have the Zone 1 rad open (acting as a bypass rad), during evening/nighttime I would open Zone 2.

    If I can't set up Zone 2 as above, I will have a HR92 that is not connected to any radiator.

    Anyway, before I 'break' my existing setup I thought I'd check with anyone who had any experience to share...
    If I understand you Correctly I have Done this by setting up a Zone as a Zone Valve and then Bind a Spare BDR to it as Zone Valve Actuator and T87RF as Stat and just dont wire a valve to BDR just use it as a Dummy Zone but you can then Schedule that Zone and Boiler BDR will Switch on Boiler

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