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I actually saw one explode last week.

The return is for the second floor only, it's 10" not 8. There is a 14" round return serving the 1st floor, which didn't show up in the picture. The orginal system didn't even have balance dampers...

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Here are some pictures of an old Rheem we changed out to an AS 80 MBH 2 stage 90 + gas furnace with a HP. Replaced duct board with hard duct and installed a Perfect Fit Air Cleaner.

I too agree with doc. As an engineer we used to "Parkerize" Carrier systems with Parker zone dampers. We didn't use by-pass dampers since the compressors could be damaged by low load conditions. ...

Just installed a brand new Trane 13 SEER heat pump. Lo and behold when I went to start it up, nothing happened. I found the HPS was bad. I'm a Trane dealer and haven't run into any problems with...

Double check your setup.
In the configuration code
170 set to 7 2 heat/1 cool heat pump
200 set to 1 fossile fuel is back up
310 increase your deadband to 5 F
340 set to 2 outdoor temp sens used...

Use 1.5 watts/sqft for lights and 1 watt/sqft for equipment. You could look at the nameplate data for the equipment, sometimes they have the rate of heat rejection.

no magnet. first thing i checked

I was called on to start a McQuay RDT075 RTU last week. I get to the job and find the unit had sat for over 2 yrs! The building is spec office building and they finally leased out the space the RTU...

I've got a Honeywell F50F electrostatic air filter. I put a brand new cell in the unit 6 months ago. Went back for a PM to clean it, it's used in a heavy smoking area. I cleaned it with nu calgon...

I specify them on every commercial job I design. Owners love it, very simple to use.

The pro's are:
good graphics
easy to modify graphics and schedules

con's
trend logs are "weird" it...

YES, no matter how well you try to filter the dust, it will collect on the coil. I see this all the time in commercial buildings. I've seen GC turn on the roof top unit before any windows are...

Look at it this way, does your doctor give you an exam over the phone?

Not to mention the liability factor. It is dangerous from a liability stand point to give advice over the phone.

When...

You don't think it's fair to pay a service guy $200 to flip a breaker?! Give us a break (no pun intended). Let me ask you, would you take off to drive 15-20 min during working hours, spend 30-45...

Did you contact the BBB? I don't know where you are in VA but I just installed a system for the president of the local chapter of the BBB here in Richmond. He's a great guy and can help you out if...

Who manufactured the equipment?

I'd have to agree with smokin68--sounds like problem is still there. I've seen a few units that trip because of a loose wire at the breaker.

#10 blower relay on Goodman AHU. Went through the last five on my truck Friday.

Went to estimate a job this evening and found a real antique. It's a Carrier Model number 38CC002300 cond unit and a 38F2-108 evaporator. These things were really neat, still running! Had, TXV's...

I can hardly wait for heating season to begin!

22 F delta T 650 CFM...

Replaced relay and cap cycled the thing 10 times. With homeowner standing right there.

There's a simple method for calculating latent cooling as well but it escapes me at the moment (there's no humidity our here).

Irascible it's Total BTU=4.45 x cfm x (delta h enthalpy)
...

Check GE's website out. Varible speed motors are ECM's electronically communicated motors. Here's the link, http://www.geindustrial.com/cwc/products?pnlid=4&famid=23&catid=118&id=ecm&lang=en_US
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I've got a Lennox AHU I'm trying to figure out the capacity of. It's CBH19-41-1P looks like a 3.5 ton with 10 KW strip.

Any help would be appreciated.

Thanks

I checked compressor amps they were ok. Didn't check blower amps. I'm going back out there this afternoon.