"Honeywell Chronotherm 3 Thermostat Problems " , posted Thu 12 Jan 17:00

Hi, we work in a commercial buliding that has gas forced air heat powered by an electric Honeywell Chronotherm 3 thermostat, looks old. Well when turned on we have preset temps for Lo/Hi well the hea ... read more

soundsidehomes

"centrifical fans " , posted Wed 11 Jan 12:49

Can someone please tell me if I have a commercial centr.fan and the downstream chilled water coils are changed to a different fins per inch, thus creating a less restricted downstream air flow, would/ ... read more

farmlivin

"commercial training " , posted Wed 11 Jan 11:32

I was wondering if someone could tell me where i could get some commercial training on line or some kind of book or something, i currently work residential (part time) ... read more

james curry

"Carrier Parker Gen-2 V V T Parts Wanted " , posted Mon 9 Jan 22:42

Will purchase, call Fred 415-456-2712 x206 or cell 415-302-5537. ... read more

zulululu

"a/c parameter " , posted Sun 8 Jan 23:16

sir i need you comment on this, i have a split type air con with 2 evaporator controlled by 2 TXV,(ALCO TCLE 300 HW 100) and this is my parameter,suction press 52 psigDisch press 250 psi ... read more

jbmendoza

"Air cooled condenser indoor installation " , posted Sun 8 Jan 14:29

I have a walk in cooler(20'W x 30'H x 7'H) installed in a high celling(18' high) warehouse, the air cooled condenser is install on roof top, the cooler can't work very well in winter. Is it possible t ... read more

lzheng

"TRANE OUT ON LOW PRE. " , posted Sat 7 Jan 11:33

MODEL TWA120A300B COOLING MODE WORKS FINE BUT WHEN GOING INTO HEAT IT WILL RUN FOR ABOUT A MINUTE OR TWO THEN SHUT OFF ON LOW PRESSURE. I DID NOTICE FREEZING AT THE CHECK VALVES. COULD THIS BE THE P ... read more

ashton

"a/c short cycling " , posted Thu 5 Jan 03:10

i have a 10 toner split type air con, the problem is it always tripping on the low pressure switch, no matter how i charge it the pressure always go down to 20 psig thus triggering the low pressure sw ... read more

jbmendoza

"a/c short cycling " , posted Thu 5 Jan 03:09

i have a 10 toner split type air con, the problem is it always tripping on the low pressure switch, no matter how i charge it the pressure always go down to 20 psig thus triggering the low pressure sw ... read more

jbmendoza

"Ice Maker Production " , posted Wed 4 Jan 01:00

We are an producer. Anyone who has experience on T type climate to improve production capacity? ... read more

sddragon

"burner plate on trane rooftop YCD120B3HAEB " , posted Mon 2 Jan 20:37

this unit is only 2 years old. it has a burner plate made up of a very fine screen. unit would not fire off. ign. and gas valve ok. took burner and gas valve out of system and found on the burne ... read more

djs

"Recovery " , posted Mon 26 Dec 19:41

Wanted to get opinions on the best all around portable recovery unit to purchace for residential service. And opinions on different units, suggestions, options, etc. I intend to get recovery tank floa ... read more

AlwaysLearning

"heat pump vent temperature " , posted Mon 26 Dec 15:56

What air temperature should heat pumps produce at their vents over the outside temperature rnge of 20-50 degrees? We have 8 year old Payne that seems to never get warmer than 72 degrees F. ... read more

mort

"inside coil compatibility " , posted Mon 26 Dec 11:15

I have a Tappan air handler/coil in the attic that was previously used with an AC only outside unit. I wanted to hook up a heat pump to it and a local contractor assured me that it would work fine. ... read more

md75eggharbor

"Evapco cooling tower " , posted Wed 21 Dec 00:21

when we run our fans to keep up with demand during winter freecooling, we are constantly having problems with the panels freezing up. we have 2) 400 ton cells with variable freq. drives and were able ... read more

uta

"Honeywell 7100 (Honeysick) T-stat " , posted Tue 20 Dec 13:51

I have 3 of my 4 Honeysick 7100 (3 years old) T-stats failing. I am looking for anything but Honeywell. I need remote sensor, heat pump, non programmable (biz is open 24x7) multistage connected to a ... read more

1417871

"Carrier roof top faulting 7 rollover(rollout? " , posted Sun 18 Dec 05:03

I am getting a fault 7 roll out or rollover switch problem. everything is running but flame either coughs out or doesn't come on at all. Where is this switch, and does anyone know where I can get on ... read more

silentsoul78

"Direct Expansion & air cooled Liquid chillers " , posted Thu 15 Dec 11:38

hi guys, i am new in havc, still learning the basics, would u please explain what is a direct expansion chiller and what an air cooled chiller is? ... read more

anisaamm

"furnace short cycling " , posted Wed 14 Dec 22:15

Hello all I am new to this forum Its nice to know I can usethe knoweledge base here. OK here goes got a service call todayfor a pilot light out. no problem right noooooo I found a lennox ... read more

shaz

"Roll Out Switch " , posted Fri 2 Dec 21:40

I've got a roll out switch opening up every couple days on a Goodman Commercial roof top unit. I've replaced the flame sensor, limit switch, roll out switch. Adjusted the gas pressure etc. I've run ou ... read more

Bri

"Disconnecting Condenser Unit " , posted Thu 1 Dec 15:04

Can anyone please help? I need to disconnect, remove, and throw away my outside condenser unit of my AC to make room for a home addition. A new AC unit will later be installed. How do I dis ... read more

mstr_hoo

"keepright heatpump " , posted Thu 1 Dec 10:05

heat pump and oil furnace combination, have only six wires running to stat location ,require more to operate unit with outdoor sensers through thermastat.Is there a way to instsall outdoor thermastat ... read more

relay

"York YCWS 80 Chiller " , posted Wed 30 Nov 21:53

Hi all, I have a York Chiller that is suffering from an un-loading problem associated with the slide control valve. I have had York change the Capacity Control Valve Solenoid, this did not fix the pr ... read more

facman

"Furnace " , posted Sun 27 Nov 11:17

what all the preventive maintenance measures to avoid Furnace breakdown? ... read more

dev

"heat pump fan " , posted Sun 27 Nov 08:27

I am in a new house and have a heat pump for the first time, not sure if it's working correctly.When the stat calls for heat, the compressor and air handler fan will come on and off to regulat ... read more

jeff lynch

"common wire used for on 7300honeywell? " , posted Wed 23 Nov 11:31:

In an attempt to reduce our energy demand, our church is trying to replace our traditional thermostats with programmable thermostats. The honeywell Series 2000 Commercial thermostats with Q73 ... read more

stevewp

"complex thermostat for a simple application " , posted Tue 22 Nov 01:06

I have a Honeywell CT3500 programable thermostat and a simple pellet stove heat source with a 2 wire (red and white) 24 volt thermostat circuit. I can't seem to get the Honeywell to work appropriatel ... read more

rjmarkin

"Replacing a Trane BAYSENS007B Thermostat " , posted Mon 21 Nov 16:57

I need help wiring a replacement thermostat from a Trane BAYSENS007B to a White-Rodgers 1F94-371 thermostatThe Trane hase numbers 1- Red Wire 2- White Wire 3- Green Wire 4- Yellow wir ... read more

WolfEMT

"Reset Limit switch " , posted Mon 21 Nov 14:32:

I have a older Consolidated Industries #HDA080NH4R furnace that shows a code for the limit switch being open. I replaced the controller board, opened all registers, changed the filter. But it contin ... read more

Alex30093

"York Ignitor stays on.... " , posted Wed 16 Nov 22:40

I have york P2MPD16N06401A upflow furnace. My new ignitor stays on? (I don't think it's supposed to.....lol)Any ideas.......Could I have cracked the ceramic base of the little copper ... read more

mikes

"relocation of thermostat " , posted Sun 13 Nov 22:20

I just relocated the thermostat and know have no power at the thermostat, the unit is a York rooftop.. Any suggestion thank you ... read more

joeybagadonuts

"HVAC Problem (Lennox) " , posted Fri 11 Nov 08:10:

I seem to have a limit switch or (rollout) problem. On the 90UGF Series the first light flashes slow and the second light is steady. About 4 months ago a new fan was installed. Could something have be ... read more

1818bsalm

"REFRIGERATORS TEMP SET UP " , posted Wed 9 Nov 12:48

commericial refrigerator needs to set its temp at4c. because its coil getting frezed. how to set. with hp/lp what should be the setting on hp/lp? ... read more

COOLTWOHEAT

"trane tracer100 " , posted Tue 8 Nov 22:20

Need to find the settings for the crt monitor used to view data on the system connected to port#1 ... read more

mrmc

"lennox gh19 furnas " , posted Tue 8 Nov 15:31

I started checking the gas furnas made by Lennox for a recently purchased building and it is a GH19P3/4-100. I noticed that is is cycling the flame on and off every few minutes. I have good air flow a ... read more

zennoh

"EDWARDS PUMPS " , posted Mon 7 Nov 12:17

Throw away all you have known in the way of vac pumps,Buy an Edwards. Can pump down to 1 micron!! ... read more

Rocketteer

"roof top unit " , posted Fri 4 Nov 01:50

Tripped roof top unit alert with beep sound or blinking LED? ... read more

devs

"Trane rooftop " , posted Mon 31 Oct 18:26

I wnet to hook up a tstat on a trane rooftop and the terminals are 1-2-3-4-5, I need to know what r-g-w-c-and y correspond to. ... read more

tomme44

"hot compressor " , posted Sat 29 Oct 11:22

I changed an r-12 system out to hot shot. It cooled for about a week. It quit. I went and found the main switch faulty I replaced the switch. with no load, it's cooling to 35*. That's where we w ... read more

krinst

"Thermostat change over mercury to digital " , posted Fri 28 Oct 15:52:

Can I replace a mercury switch BDP model #P271-3456 similar to the Goodman/Janitrol model #HPT18-60 are these thermostats comparable 2 stage heat & 1 state cool? I can't find any literature on these m ... read more

RAC