I have a Totaltouch stat and need a little pointer on installing a relay to
DH-BK-Y1 as discussed in the following information. The heat pump is a Trane
The Totaltouch stat only opens BK (reducing the maximum CFMs when
called for) but does not, at the same time, call for cooling unless the temp is
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
and turn the fan on. The Totaltouch allows you to turn on the fan thru its menu
you enable dehumidification. That's good.
But I need install a relay in the air handler that simultaneously de-energizes
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
AND DH are called for, this setup runs the fan at low CFMs until the DH setpoint
satisfied. When cooling alone is needed, the fan will run at full speed (after