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The mitsubishis are 2.5, 2.5, and 3.0 tons the emer. backup really never runs so yea it still equals around 15 tons of cooling. The minisplits are "low ambient" capable but are not "0' deg." capable....

I don't see their heat exchangers or see an explanation. I'd stick with air-air on a hrv and use water -air for heating. If you try to make these things do to much they end up not doing anything...

Central Oregon is not humid. but I really need a reliable source before I can start giving averages. Basically when I was in residential we installed humidifiers and they run quite often to maintain...

The economizer is a little confusing. I am looking for any information to clarify the purpose and capabilities of these units. I am an Hvac tech from the residential installer upbringing but have...

Sorry I was intending this thread to go to the commercial controls area

Internala/c

The economizer is a little confusing. I am looking for any information to clarify the purpose and capabilities of these units. I am an Hvac tech from the residential installer upbringing but have...

Exactly, I can do the job for a fraction of the price. I figured about $1,350 for all the 24v ARD dampers, Qty8 16" 90* elbows, the upsized transformer, and the control wires(18gauge).
These...

Oh, the question. Has any body worked with 120v dampers? So far my suppliers shot me down. ("No such product") Are there any installers out there?:rolleyes:

Is the Goodman unit a 'RTU' or is it a split unit? Because maybe an economiser kit with 100% exhaust could be added if it was an 'RTU'. But I'm not sure if that is in the budget or even possible w/...

I'm perfectly happy with a 24v Honeywell ARD damper but some how an electrician got a say in my next project. Anyways, he is suggesting a 120v round damper instead of a 24v. So my orders are to see...

thanks for the replies, It'll be awhile before I can give you an adequate response.

The title is the problem. Does any one know what might be causing this? All other intellipaks are using the economizer at varying percentages. There are no active diagnostics. I realize this could...

A heat pump should run for at least 10 minutes before it heats the house. that is just an estimate and open to oppinion but one thing is for sure is that your unit costs more to start and stop than...

Are you sure it was a mouse or was it the last home owner, sometimes I can't tell the difference.

What you are asking for is not usually one set point. This usually depends on the humidity outside, wind chill factor, and the temperature in relation to both of these. OH and the accuracy of your...

Are you sure the noise is coming from the blower? 73* is should not be a problem for these units. Maybe your outdoor unit is running in y2 while your indoor unit is running is y1 (stages of...

I told you that I'm am an HVAC tech. not an HVACR tech YET. I am not too proud to call a "refer tech" out, but I have time to learn about these units if you guys do. so I am asking for your help. ...

The compressor nameplate did say 16 poe and the refrigerator nameplate said 17oz. So 16 or 17oz I'll try both if I decide to evacuate the system.
The unit is likely to be just R-22 but I might...

This may seem elementary but here goes. I've got a reach-in refer that is holding at desired temp but it is really hot. After reaching the desired temp the pressure cut-out cycles the unit one to...

I am looking for optimal water condition and also poor condition so that I can adjust appropriatley. We have test kits and gallons of chemicals for the boiler water in the mechanical room but I have...

My unit is a 2 ton unit and it is under waranty because my company honored it as new. Matter of fact I already have a new compressor sitting in my garage waiting for me to put it in. But I noticed...

Pressure switch on two seperate boiler units are not satisfied with combustion air after I performed maintanance on burner assemblies. Could the exhaust flue dust that I stirred up clog internal...

My compressor is knocking and tripping the breaker on startup sometimes I was told that the Hermetic compressors somtimes get knocked off their springs. This is a new unit to me but it has been...

I'd suggest changing the lineset since your quotes are for 410A refrigerant.

That boss is crook or an idiot.