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Posted by AED on October 1, 2006, 4:13 pm
what about bridging the DH relay to the Y1 relay that way when there is
a call for DH it will key y1
Joe wrote:
> I have a Totaltouch stat and need a little pointer on installing a relay to
control
> DH-BK-Y1 as discussed in the following information. The heat pump is a Trane
(2h/2c)
>
> The Totaltouch stat only opens BK (reducing the maximum CFMs when
dehumidification is
> called for) but does not, at the same time, call for cooling unless the temp
is above
> the cooling setpoint (there's no signal on Y/Y1 when the stat needs DH only).
>
> Apparently you need to energize Y/Y1 at the air handler, de-energize BK for
low CFMs
> and turn the fan on. The Totaltouch allows you to turn on the fan thru its
menu when
> you enable dehumidification. That's good.
>
> But I need install a relay in the air handler that simultaneously de-energizes
BK and
> turns on Y/Y1(cooling) when the stat calls for DH.
>
> Can someone mention the name/part/type of relay? I understand that when BOTH
cooling
> AND DH are called for, this setup runs the fan at low CFMs until the DH
setpoint is
> satisfied. When cooling alone is needed, the fan will run at full speed (after
the
> Comfort-R ramp-up).
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