[TRNSYS-users] HELP: In TRNSYS 17: How to connect a thermostat switch (Type 2b) to switch ON a pump at a particular temperature range else keep the pump OFF.

[Vinod]

David Sir,
Thank you very much for your positive and prompt response. I need some more clarifications in this regard.
I've a collector whose hot water drain should be started only if outlet temperature is above 50 degree Celsius by switching ON the pump.

Kindly guide me on connections as per attached image.
Thanks a lot.
Regards
VeekayIndia 
From: David BRADLEY <d.bradley at tess-inc.com>
Sent: Thu, 17 Dec 2015 03:05:05 
To: "TRNSYS users mailing list at OneBuilding.org" <trnsys-users at lists.onebuilding.org>, vviinnoodd at rediffmail.com
Subject: Re: [TRNSYS-users] HELP: In TRNSYS 17: How to connect a thermostat switch (Type 2b) to switch ON a pump at a particular temperature range else keep the pump OFF.
 
  
    
   
  
    Veekay,

      There are two ways that Type2 can be used. Most commonly it is
    used as a differential controller such that it turns on when the
    difference between two temperatures exceeds a certain amount and
    then stays on until the difference between those temperatures falls
    to a different amount. You'd use this in a solar thermal system when
    you want to turn on the collector if the collector temperature
    exceeds the storage tank temperature by (for example) 10C no matter
    what the temperature of the storage tank. This was the method that
    Alastair correctly suggested.

      You can also use Type2 like a more traditional thermostat in which
    case you typically want to turn on a device when a monitored
    temperature exceeds (or falls below) a certain set point value.
    There are proformas for Type2 set up to do this. They are located in
    Controllers: Aquastat: Heating Mode and Controllers: Aquastat:
    Cooling Mode. Alternatively you can use Type108 which, while it
    allows for more than one stage of control, can also be used as a
    simple thermostat in either heating or cooling mode.

    kind regards,

     David

    

    

    On 12/16/2015 12:44, Vinod wrote:

    
    
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