"Chiller Problems " , posted Wed 20 Jul 14:17:

In my facility I have a 350-500 Ton Carrier 19XL Chiller. My question is "How do I know the exact refrigerant charge?" We lost a large number of refrigerant when the contracting agency did the PM on t ... read more

kywallace69

"T8624D Honeywell Problem " , posted Mon 18 Jul 18:01

I'm working at a non-profit in New York City. Recently I purchased three Honeywell T8624D's to replace our Honeywell T874D's. Then we'll have programmed on and off times and I won't have to ... read more

toomyw

"Singer Split system " , posted Mon 11 Jul 10:21

I have a Singer BC3012. Was there electric heat available for this unit? If so could I tell from the model number? Also the tag on the condensing unit was pretty sun washed. Did I read that ACR510 ... read more

bwildrick

"5 ton air handler " , posted Sun 10 Jul 19:35

does anyone know where to purchase a Goodman air handler at the best possible price. Thanks in advance for your help. ... read more

hotspot

"Baystat 239 to Honeywell T8112 " , posted Sat 2 Jul 12:46

I picked up a Honeywell T8112 from an installer friend. He said it should be fine to replace my current setup.Well, the Baystat 239 has 8 connected wires and the Honeywell only has 5 terminals. read more

mmckeen

"Trane VAV Parts " , posted Fri 1 Jul 17:10

Looking to find replacement Trane Vav Damper motors for 1980's air valve style boxes. Trane no longer carries the motors. They have the white plastic gear on them. Thanks ... read more

chrisA

"Robertshaw 9620 Error Message " , posted Thu 30 Jun 12:08

Does anyone know what the display message "-AC" means, and how to correct? This is on a Robertshaw 9620 in an office. We have 2 units and periodically get this message.Thanks,Tom ... read more

officemgr

"noise " , posted Tue 28 Jun 08:13

I installed a 4 ton goodman heat pump. Everything seems to work fine except the outdoor unit make a hard hiting sound when it starts. need help on this one. The Connecting lines are only about 4 foot ... read more

AC Ranger

"need some help, pleaseeeeeeeeee " , posted Fri 24 Jun 17:20:

I am an AC contractor, and did a job on a cooler unit rooftop condensing unit, brand new compressor wont start, replaced relay, caps, voltage is fine, contactor is fine, i even put a hard start on it, ... read more

chillcool68

"Pressures and temps " , posted Tue 21 Jun 20:50

I had a problem today. Unit wasn't cooling as it should. It's a 15 ton York, 3 compressors, (2 tandom, 1 single). The tandom pair was showing suction pressure @about 96 psi, 55-60 degrees. Discharge p ... read more

GilbertC

"Trane Service " , posted Fri 17 Jun 15:56

What is going on at Trane? I am hearing from several Facilities Managers and multiple sites that Trane is becoming more and more unresponsive. Is anyone else having trouble with Trane? We have been ... read more

Driftwood

"bypass a york Logic Module? " , posted Tue 14 Jun 14:04

Has anyone ever bypassed a York "Logic Module" 1988. I have a 7 1/2 ton York split HP on a roof top with what i presum is a bad Logic Module and while I wait on a new one I was praying someone here ha ... read more

Brian Va

"Chronotherm III " , posted Sat 11 Jun 14:38

Where can I find instructions on how to program my Chronotherm III thermostat? ... read more

Debbie Kay

"Carrier RTU Compressor Problems " , posted Wed 8 Jun 16:47

this unit was cycling on and off, I hooked up gages to it and the suction side went down to 40 psi and cut off, got a little freon and added some but the unit did not seem to take it, I opened the hig ... read more

stonecold

"Cent. Chillers Water temp fluct's. " , posted Mon 6 Jun 11:01

Hi all - especially Chiller Guy since we couldn't get this post to work in the other forum.... LOL EQUIPMENT:1 Trane Cent. 600 To ... read more

niko851

"Replacing 7.5 rooftop unt " , posted Fri 3 Jun 10:01

Can anyone give me advice on replacing my 7.5 rooftop unit for a commerical building, which is currently a trane unit, installed in 1962 and no problems, just age. I have 3 quotes from vendors wantin ... read more

Deborah

"american standard no heat " , posted Wed 25 May 23:11

I have a american standard 90afue 2-stage furnace with variable speed blower that just doesnt wanna start heat? the t-stat calls for heat, it will cycle and ... nothing.. it will go through the 3 cycl ... read more

hivoltage98

"american standard no heat " , posted Wed 25 May 23:11

I have a american standard 90afue 2-stage furnace with variable speed blower that just doesnt wanna start heat? the t-stat calls for heat, it will cycle and ... nothing.. it will go through the 3 cycl ... read more

hivoltage98

"short cycling " , posted Fri 20 May 00:57

Today I had a condenser fan motor freeze. Not sure how long, but I suspect a couple of days, it was hot as fire, and the compressor was still running but kicked off (naturally). After I replaced the f ... read more

postmech

"Can someone please tell me what I have???? " , posted Wed 18 May 16:23

Ok i buy rooms at auction and on 1 of my latest ventures I came across this:4 - 4'0"VLN Electric Actuator c/w Interface Box Powder Coated White4 - 4'0" Linear TrackSection Powder Coated White< ... read more

napanoid

"Looking for cross-reference guides " , posted Tue 17 May 14:28

I am looking for cross-reference guides or tech-lit. info. that will allow me to identify tonnage and HP on older model York,Trane,Carrier,McQuay split systems that are typically 15-20 years old. I of ... read more

RDB

"Refridgerant Recovery " , posted Sun 15 May 10:04

I will be starting to recover refridgerant from refrigerators and freezers in a large scale application (80 - to 100 units daily).I have had all kinds of "portable" recovery units shown to me ... read more

ajae

"56 Heat pumps. Looking to hire in-house tech. " , posted Fri 13 May 17:44:

Taking care of 22 buildings of a retail chain, my expenses are growing up in the HVAC department by contracting out a maintenace company. I am looking for the right person to handle these few units tr ... read more

Juan Larios

"trane wreck yc-iom-13 cool failure / heat " , posted Wed 11 May 18:27

Hi, I am new to the site, but I have a problem that I was hoping someone could help me out with. I have about 15 trane roof top units that were all installed last year. I am constantly battling a cool ... read more

livewire

"Carrier HP high pressure tripping " , posted Fri 6 May 22:40:

I am working on a Carrier 3.5 ton HP. I replaced a 25 MFD capacitor to make it run. Then I installed guages and watched the head climb to nearly 500 psi. I removed the top and cleaned the coils ... read more

Topkick

"Sears wall mount furnace " , posted Mon 2 May 08:41

Have a very old, 25-27 year old Sears wall mounted, gravity flow, vented gas furnace that has a very beat up grill / cover that I would like to replace with something close in size to the original - n ... read more

timkat

"american standard to honeywell rth8500d " , posted Sat 30 Apr 20:33

need to know how to wire thermostat, what colors go where, i have 8 wires and i dont think it was wired right when i bought the house, need to know what wire goes to what terminal ... read more

chevlust

"american standard wyc wiring to honeywell rt " , posted Sat 30 Apr 20:31

need to know how to wire thermostat, what colors go where, i have 8 wires and i dont think it was wired right when i bought the house, need to know what wire goes to what terminal ... read more

chevlust

"Equitable electrical / gas bill sharing " , posted Fri 29 Apr 10:17

There will be 2 companies in the same building sharing the same gas and electric meter. We are in different parts of the building, so we each have our own tstat and hvac units. I suspect the units ar ... read more

dcmonfutest

"moisture in the system " , posted Mon 25 Apr 14:47

Why kind of symptoms if there were moisture in the refrigeration lines? I have seem flare nut expanded dued to moisture freeze up. ... read more

beginner

"Mammoth Large RTU heat pump " , posted Fri 22 Apr 22:31

Hi Fix a leak today so I’m was charging from scratch25 HP Compressors. The unit data plate shows a comp FLA of 33 amps. The compressor shows 44. I have never noticed this type of differenc ... read more

sm7

"Reinstalling a T8611R " , posted Fri 22 Apr 15:27:

Every since the last routine service call, I have been having problems with my system and I want to check the wiring. I have the wiring diagrams for the heat pump and the air handler.Heat pump ... read more

Berry

"help " , posted Thu 21 Apr 22:12

I changing from a Totaline non programble thermostat to a Honeywell T8600D 2028 programble thermostat.The old one was wired Y-Y, G-G, W-W, R-R, & B-C. The new one I connected Y-Y, G-G, W-W, R-R, there ... read more

lander9975

"running heat pump " , posted Mon 18 Apr 11:07

my thermostat is set at 75 degrees, it is 59 degrees in here, and my heat pump is still running. what should i do? ... read more

j godfrey

"Please explain Charging method of A/C " , posted Sun 17 Apr 17:49

i want to know refrigerant charging method without char that mostly manufacturers prepared. ... read more

woodysunwoo

"Furnace none stop " , posted Sat 16 Apr 23:08

I have a Day & Night furnace. It goes on without hot air. I checked the inducer and cleaned the FSE, put them back in, and reset the temperature. The furnace seemed fine afterward. Then 30 minutes lat ... read more

brucew

"change freon " , posted Thu 14 Apr 05:28

Good afternoon dear experts,I need to replace R22 on R404A in a refrigerator (0 С … +6 С). I change compressor Embraco NE6181E on NE6181GK, I put the new (clean) evaporator and the con ... read more

hvaclex

"Dorky York " , posted Wed 13 Apr 22:46

I am going crazy with this york package unit. It has a Smart valve set up and will run fine in the heat mode with the service door off. We have changed the gas valve, pilot assembly and supply tube, I ... read more

mrphixit

"CHANGE OVER SET POINT " , posted Wed 13 Apr 10:13

HAVE TRANE TCD210 PACKAGE UNIT. IT HAS AN ECONOMIZER, ON THE BOARD IT HAS MIN POS. O/A AND SW1 SW2 DIP SWITCHES. I THINK THE SWITCHES ARE FOR THE SWITCH POINT TO CLOSE O/A AND START MECHANICAL COOLING ... read more

IMNOTCOLD

"line temp versus ref temp " , posted Tue 12 Apr 06:22

i'd like to know the diff btw survace temperature of evaporator and refrigerant temp so how to measure accurate superhaetthanks ... read more

hvacsherif