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11-09-2005, 11:43 PM #14
On a Trane, When you use a single stage t-stat, the W1 and W2 will need to be jumper together..
So when there is a call of heat, the board sees power at both lead right away, then the timer kicks in to hold the 2nd stage back to X amount of minutes.
(Dip switches can be set for .5, 5, 10, 15 min delay)
Now if you use a two stage t-stat, jumper is not used, and when the t-stat calls for heat, the W2 isn't powered up right a way.. There is a sec delay on contact.
so, either the units shuts down before 2nd stage time runs out, or the dip switch is set up at 30 sec delay, and pretty much fires up in high stage right away.
11-09-2005, 11:44 PM #15Regular Guest
If you don't jumper them, how is the unit going to know whether it's a single stage or two stage stat?
- Join Date
- Oct 2005
But then, to anyone who isn't familiar with that particular clever design, it looks a whole lot like somebody wired in permanent high fire. Maybe it is possible for a design to be too clever. (I might also wonder, if anybody makes a 2-stage stat that doesn't use totally separate dry contacts, if such a stat could fool the Trane board into thinking it's jumpered. Maybe nobody does and so it's a non-issue. Sometimes the K.I.S.S. principle is a good one.)
11-10-2005, 06:58 AM #16Professional Member
- Join Date
- Aug 2002
- manitowoc wisconsin
When you use the disadvantage of a timer you rob yourself or your customer of efficiency,comfort with temperature,&comfort with noise levels.when hooked to time out for second stage it will needlessly bring second stage heat in"running high fire all the time"!It should only run in high fire when temperatures are nearing design point.Take your time & do it right!