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I am a Supervisor for a major HVAC contractor in NYC. It is very hard to find good apprentices. Most of the young guys just starting out want to talk on their phones all day or text their friends....

Thanks. Don't have much hope, Liebert could'nt answer. Seems the BMS has precedence over the unit control panel.

You seem to know about all the companies in NYC. Bounce around a lot or have you found a place to stay?

Large server room on BACNET. Units won't accept parameter changes. Trying to change Autorestart TD. Any changes made revert back to default. Any ideas?

Looked at 3 of these today. Had only one compressor run out of 12. Looked like 3 compressors were not pumping, suct/disch were both the same. Several of them had EXV Alarms, and several of them were...

Your local supply house should have RX11 flush kits. They are a little expensive but will help clean your system.

15-20 degrees s/h at compressor, higher than 25 and you risk overheating compressor motor. All IOM manuals do not specify s/h at compressor, only at the outlet of the evap coil. 15-20 is the best, I...

Thats what I'm thinking, PSIO has original battery and unit is over 15 years old. I did shut power down to replace some waterside sensors, when I repowered there was no more communications. I already...

I have 24volts, all connections are tight. I get red status blinking, communication green led is blank.

I spend 80% of my time following guys on callbacks. The problem is either over their heads or they just don't care. If my guys get too many callbacks they wind up just doing maintenance 40 hours a...

Have a 30HR090E500 chiller, I have a blank display and am not getting comm leds lit up. Status leds are blinking. I believe its the processor module, all fuses good. Any ideas, can't run unit.

about 10 degrees subcooling, unit is a split air cooled dx system. Multiaqua puts a TXV on their evaps and you have to supply a condensing unit. Manufacturer states they rate this coil at 250cfm per...

Recently installed 5 ton multiaqua dx evap mated to a 5 ton skillaire condensing unit. With unit running we are getting 40# suct/200# disch. 35dt across evap, little to no superheat. Evap only...

Correctamundo, like I said subcooling is only part of your troubleshooting. But it can and does help diagnose a problem. This post can be pages long if we list all the symptoms for...

Whats the delta across the barrel? You are looking for a 10 lb pressure drop across the chiller barrel. If you are not moving enough water you will start sweating back to the compressor. 20 degrees...

High subcooling would let you know if you were overcharged. Low subcooling would let you know if you were undercharged. However it depends on the superheat, TD across the evap/cond etc. It can be a...

Wine Cellar, refrigeration condensing unit indoor (R22). EMI Ductless split Evaporator section inside wine cellar. Manufacturer calls for 8 degrees superheat. System has a CPR valve, manufacturer...

Taking it this Saturday, practice test has questions on everything. They say only 20% pass this exam. Never took the NATE, did'nt see the point. You get 30 college credits if you pass the Star. Boss...

http://www.citymulti.com is the answer to all your questions.

To find out if you damaged the valve, all you have to do is remove the powerhead. Flip it over and feel the disc where the threads are. If it can move with your fingers it is NG. If you can't press...

TXV, 80-85 suction, 200-225 discharge. I will try lowering the fan speed, the only thing that bothers me is the customer says the unit used to kick a.....

Water temp is good, unit has a water regulating valve. I'm thinking restriction as the suction goes into the compressor. Thinking about adding a couple of piercing valves to check pressures in...

Water flow is good, strainer is clean. Entering air was 79 degrees, supply air was about 69 degrees. Direct drive fan motor running high speed, customer says unit used to run very good. This is a...

Was working on a 1/2 ton florida heat pump that was only putting out 10 degree delta (evap) in cooling. Suction 80-85psig, Discharge 200-225psig.
This is a water source unit, another technician...

Thank you R12 for your reply. My recent reply in this post was targeted to FAT EDDY. I had the audacity to question him in another post. His ego is probably bigger than his waist line. I really do...