Any HVAC experts?

[StirCrazy]

Originally Posted by hillegom

The fan on the ac unit is turning. But is it turning because the motor is on, or is the fan turning because the air is being pulled through the duct to replace the air that the air exchanger is pushing to outside?

there is no conection between the outside AC fan motor and an air duct, the outside AC fan is just to cool the condensing unit.

I would get a real HRV guy and bite the bullet for a few bucks and get it fixed properly. this should not be comming on and a AC unit fan is not a cheep one to run. Also you are using the aire exchange in the summer that fan will be running twice as much and I imagin replacing that fan will be a lot more expensive than getting the aire exchange hooked up properly.

Steve

[hillegom]

Originally Posted by StirCrazy

there is no conection between the outside AC fan motor and an air duct, the outside AC fan is just to cool the condensing unit.

Steve

I didn't know we were talking about the outside fan motor. I thought the fan was on the inside of the house, blowing through the evaproator

[Seriak]

Well no luck. No matter if the thermostat is set to off, hot or cold as soon as I turn on the air exchanger, the outside a/c fan comes on. Now to decide whether I bite the bullet and pay an arm and a leg to fix it now (As you know they will overcharge me somehow) or just turn off the A/C in winter.

[rayjay]

You should be able to trace the wiring from the AC and from the air exchanger to where they interconnect and fix the problem there.

[e46er]

Originally Posted by Seriak

As you know they will overcharge me somehow

call a reputable company then because not all heating and AC companies are crooks

my companies AC service call is $135 and $95 an hour after

if you dont wanna pay a company your going to have to learn to do it yourself

[wingedfish]

You won't fix it yourself unless you can understand what everything does. Before you had the AC installed the HRV was interconnected to your furnace/airhandler fan. The a/c guys tied into this same system. When your tstat calls for a/c, an inter connection in the tstat brings the air handler fan on also. What is happening to you is it is back feeding so when you turn on the HRV, the a/c turns on as well. This is very bad. To verify if i'm right, turn on your hrv and if the a/c is on, flip the fan switch on the tstat to "on". The a/c should turn off. At best it will cost a boat load of power. At worst it will ruin the compressor. Let the a/c guys know and they will likely fix it up for you.

[Seriak]

Originally Posted by wingedfish

You won't fix it yourself unless you can understand what everything does. Before you had the AC installed the HRV was interconnected to your furnace/airhandler fan. The a/c guys tied into this same system. When your tstat calls for a/c, an inter connection in the tstat brings the air handler fan on also. What is happening to you is it is back feeding so when you turn on the HRV, the a/c turns on as well. This is very bad. To verify if i'm right, turn on your hrv and if the a/c is on, flip the fan switch on the tstat to "on". The a/c should turn off. At best it will cost a boat load of power. At worst it will ruin the compressor. Let the a/c guys know and they will likely fix it up for you.

Well you must be a HVAC installer as you were right. If the fan is going on the a/c unit after I turn on the Air exchanger and I turn the fan from auto to on, the fan does shut off. I am assuming this is a simple fix and it shouldn't cost me very much?

[wingedfish]

I wouldnt be quick to call it simple and cheap is a relative term. It would take me a relay and service call, shy of 200 would be a guess. A reputable company in Calgary would likely be just over 200. A guy that scratches his head lots and lets the smoke out of electronic boards could cost a thousand.