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I've had a drive behave similaly where it misbehaved on a analog input signal. Call ABB tech support and work through the problem. Shouldn't be too difficult to figure out

Any kind of grease is better than no grease at all. I wouldn't worry about it, but then make sure the right grease is applied hereafter.

My guess is a mis-wire but since we're dealing with 'New Guest', all I can say besides "look at everything" is to register as a pro for more detailed advice.

Any 10k ohm sensor should work

You just never know sometimes. Apprentice working on 2"pvc piping tightened up a union stood up and his elbow brushed an RTD in an aluminum housing and it lit him up. 120v control box in the other...

To modulate, or not to modulate. That is the question.

I'd be looking closely at the return air too. You said you need a lot of outside air so the return air is less. Can't get the moisture out if it doesn't make it back to the unit. Any adjustment...

Irwin adjustable pliers - tough as nails. I use it as a hammer all the time.
Gearwrench 1/4 / 5/16 ratcheting wrench with sockets and bits - real time saver for those hard to get to
screws.
5/16...

I'd like to see that :whistle:

Depends on the humidity of the air entering the unit, how cold the coil is. These can vary throughout the seasons. If your unit has been off for quite awhile, and especially if in the hot attic the...

Forum rules prohibit advising owners on self-repair. Apply for Pro status if you're in the trades and you'll likely get a few responses if approved.

Never know. I found a service bulletin on LG's website. Wasn't in the install literature.

I've only seen chems in a closed steam loop (1200psi Navy). I figure it would be a non-issue in humidification applications but I seldom see steam any more.
And surgeons . . try to get them to work...

Had a branch box ver5 to install on a CUver4. Factory had to update the CU's firmware. Maybe that might work.

99.99% of the issues with wall furnaces is in the header plate. Flue is drawing a draft from somewhere other than the Hx. Make double darn sure the top of the unit is ALL the way up into the header...

I would think living in Tunisia with a firm understanding of the trade and knowing where to go to get what you need - you could rule. Get after it man.

opening of concentric installed into the direction of the prevailing winds? I can't recall an issue like this in the past. just throwing an idea out there

You can learn a lot too by studying the blueprints of commercial mechanical installations particularly designs of high rise, military, and tech buildings. These types of buildings tend to have...

Do what I do. Read the manuals. Read ALL of the manuals.
Can you be more specific?

Amana - plastic parts, not suitable for public, easily pilfered.
I'd prefer a more secure cover / control panel for motels etc.
They do have a pretty trick mesh network wireless interface.

Merv 13 filters are booming

My number one is being bounced. Office sends you on Project #1. Middle of project is an emergency. Drop #1 to checkout #2. #2 requires a run to the store. On the way #3 comes in. At one point...

Dang, I've seen this before but it's been 2 or 3 years. Cycle the circuit breakers off on all units. Power up the fancoils first, slave 2nd, master last. Redo the auto address. Tech support out...

bleed liquid in until you see a POSITIVE Pressure on the system. More than zero but not so much that you have to mash the core tool to get the core back in. Goal is to minimize refrigerant in your...

Boy that is a fun one. Barring any other data you're going to have to guestimate an oversized pump and throttle it back with a triple duty valve to 281 gpm as measured at the pump. Assuming a...

Could the building hang on one 40ton chiller? Will the new chillers rotate? VFD's on the CHW pumps? Differential pressure control on the chiller barrells? These are questions that could help you...

leg to leg - the smaller the motor, the higher the resistance. You might see 50ohms on a small Cframe fridge motor, 15ohms on a 1/6hp blower, and barely 1 ohm on a 50hp premium.

Found a CCH last week that passed my Fluke stick meter (200ohms range). My Klein meter said the CCH was 16.7kohms to ground, blowing the 460v 10a fuse on power up. Don't need a megger for that. ...

Please call a service company. Heaters are nothing more than a controlled fire in a metal box. All that you've described can be simply fixed.

Funny, the octal bases are with us to this day.

And . . . you need to consider the sum of all the three-ways in the loop. The total flow of all should be above the chiller's minimum flow requirements.

OP was talking about fan bearings. Most any Lithium based grease will do fine. I have yet to change out a fan bearing that was greased regularly with any kind of grease. I've change out plenty...

Yaskawa has a simulator tool that might help. Comes up easily in a browser search for download.

100% agree with JLBN Ditch the flare nuts except at the CU space permitting
Another tool I find handy - a wadded up rag/paper/whatever covered in duct tape about the size of a cantaloupe for...

Sucks to be stolen from. 1am one night guy broke out my rear window in my driveway. Got a few of the larger items (nitro-vacuum-sawzall) before my neighbor opened their front door and he bolted in...

I'd have to guess automated machinery in a controlled nitrogen environment using 5% filler.

It's all about money. Inventory is taxed. You have six compressors sitting on a shelf, as a supplier you pay taxes on that stock. Early 2000's really changed how our suppliers move their parts. ...

Quit piddling around and grow the business already. You have the work obviously so sell the heck out of it and go get yourself a right hand man.

CT's are normally close on prove open on fail so use this to control an SPDT relay.

I had a 20t Trane Vger. Was installing smoke detector tubes in fan section. Took the back panel off, you know the 8 x 8 ft weighs 50lbs when the wind caught it and it cartwheeled the corner into...

As if the tape or pookie is going to seal the threads!! The PTFE in the tape or pookie reduces the friction between the two surfaces allowing you to get a closer fit (a couple more turns) out of the...

Tough one where the staff has made this a problem and now you have to tell them otherwise. Could you possible get them to condition the makeup air?

HVAC controls as we know it are ultimately capable and very complete however the buy-in required to play in their sandbox is huge. I routinely need simple solutions for small projects that don't...

Seems to me you need to be talking with Emerson. Their drives are a bit different. If memory serves, removing the display will kill the drive if so configured.

Anyone using industrial controllers such as Automation Direct P1-540 - etc. ?
Aside from the mind-bending ladder logic - thoughts?

Microchannel condensors are a lot smaller (and a lot more efficient) than the tube and fin coils they replace. The charge must be more exact as a result.

+1 for the dryer. Verify the piston / distributor tubes too.

"Pay attention to units and systems which are running properly. Touch them, feel the lines, feel the air temps going in and out. Pay attention to how they sound, how they vibrate, everything about...

It may be the units serving have the capacity to deal with your issue. A thorough inspection of your RTU's would be a good start.

Depends on your site's control structure and piping arrangement. Sometimes the pumps turn the chiller on, sometimes the chiller turns the pumps on. Could be electrical issues. Time to call for an...