I am interfacing an air conditioning unit to a digital thermostat. It currently runs off manual controls. The a/c fan motor is a 3-speed, with a connection diagram like this:
BROWN---------------Capacitor
BRN/WHT-------------Capacitor
WHITE---------------Line (N)
BLACK-----0 HI
YELLOW----0 MED O-- Line (L)
RED-------0 LO
The current manual controls switch the live line connection between EITHER Hi, Med, or Lo to determine the motor speed.
The new thermostat has three relay outputs: Hi, Med, Lo. It is simple enough to interface these to the motor, but the problem is the three speed outputs are 'cummulative'.
That is, on low speed just the Lo output is active, on medium speed BOTH Lo and Med are active, and on High all three are active.
Given that the motor currently gets a Lo or a Med or a Hi connection, would it be detrimental to have two or three of these lines connected at the same time?
Thanks in anticipation of a reply - I have spent the morning researching this but cannot find an answer.
Chris
BROWN---------------Capacitor
BRN/WHT-------------Capacitor
WHITE---------------Line (N)
BLACK-----0 HI
YELLOW----0 MED O-- Line (L)
RED-------0 LO
The current manual controls switch the live line connection between EITHER Hi, Med, or Lo to determine the motor speed.
The new thermostat has three relay outputs: Hi, Med, Lo. It is simple enough to interface these to the motor, but the problem is the three speed outputs are 'cummulative'.
That is, on low speed just the Lo output is active, on medium speed BOTH Lo and Med are active, and on High all three are active.
Given that the motor currently gets a Lo or a Med or a Hi connection, would it be detrimental to have two or three of these lines connected at the same time?
Thanks in anticipation of a reply - I have spent the morning researching this but cannot find an answer.
Chris