Search: Posts Made By: Bob14525
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07-10-15, 07:24 PM
Replies: 29
Views: 1,597
Posted By Bob14525

Mitch, glad to hear that you got the system...

Mitch, glad to hear that you got the system working again. Your persistence paid off.
07-06-15, 08:57 AM
Replies: 29
Views: 1,597
Posted By Bob14525

That may or may not work. In theory, it should...

That may or may not work. In theory, it should work. In practice, it depends upon how much of a load the circuitry on the board presents. If it presents too much of a load, the transformer fuse...
07-06-15, 06:02 AM
Replies: 29
Views: 1,597
Posted By Bob14525

Mitch, glad to hear you're making progress. I've...

Mitch, glad to hear you're making progress. I've been suspicious of the furnace board. Since you have 28VAC between Y & B at the Thermostat terminals, but 0V between Y & B at the Outdoor terminals,...
07-05-15, 10:26 AM
Replies: 29
Views: 1,597
Posted By Bob14525

Mitch, thanks for the detailed explanation. You...

Mitch, thanks for the detailed explanation. You are correct in that it appears that the Blue wire on the B terminal is the Common (ground). Assuming that the Y terminal on the Outside connector is...
07-03-15, 06:11 AM
Replies: 29
Views: 1,597
Posted By Bob14525

This is the first time you've mentioned the B...

This is the first time you've mentioned the B terminal. B is normally used with heat pumps and controls the operation of the reversing valve. All of your voltage measurements should be made...
07-02-15, 03:32 PM
Replies: 29
Views: 1,597
Posted By Bob14525

First off, R is the output of the 24V transformer...

First off, R is the output of the 24V transformer and should always have voltage referenced to the C (ground) terminal, so that is okay (no problem). The Y wire is the one coming from the house. ...
07-01-15, 08:31 AM
Replies: 29
Views: 1,597
Posted By Bob14525

From the pictures/diagrams you posted, it appears...

From the pictures/diagrams you posted, it appears (to me) that you may have a wiring error. I'm not an expert on these things, just an educated homeowner and electrical engineer. The reversing...
06-30-15, 05:56 PM
Replies: 29
Views: 1,597
Posted By Bob14525

If I understand you correctly, there is always...

If I understand you correctly, there is always ~24VAC on the control (low voltage) line coming into the outside unit, regardless of the thermostat setting. This is not correct, however it should...
06-30-15, 04:23 PM
Replies: 29
Views: 1,597
Posted By Bob14525

My guess is that you're not looking at the...

My guess is that you're not looking at the correct wires. The 24/28VAC should only be present on the wires going to the outside unit when the thermostat calls for cooling. If the 24VAC was present...
06-30-15, 11:59 AM
Replies: 29
Views: 1,597
Posted By Bob14525

OK, your picture now shows up, however it's so...

OK, your picture now shows up, however it's so small it's very difficult to tell much, other than I see that the thermostat wires are on the bottom. It appears (again, hard to tell for sure) that...
06-30-15, 09:35 AM
Replies: 29
Views: 1,597
Posted By Bob14525

I don't see any picture, however you are correct...

I don't see any picture, however you are correct in that when the thermostat is calling for cooling there should be 0 volts between R and Y both at the thermostat and the control board. If you...
06-30-15, 05:36 AM
Replies: 29
Views: 1,597
Posted By Bob14525

Yes, you should read 0V between the R & Y wires...

Yes, you should read 0V between the R & Y wires both at the thermostat and at the furnace control board. It appears that you may have either a disconnected or broken wire (most likely the Y wire)...
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