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Sounds like dirty contact in limit switch causing a voltage drop that only occurs under a load

Has anybody ever noticed liquid or hot gas flow "short circuiting" through a another module in same system that is not running?

I witnessed this on a dual module system with only one running....

Been away from resi for quite a while so not up on the latest....have older VP 8000 and need to add wifi control in my own home. Looking for opinions on best stat with the most flexible setup options...

Both of these codes are related to overcurrent situations in the inverter compressor circuit and are closely related. Since you have already changed inverter boards, the only other problem could be...

Trane minisplits are rebadged Gree (Chinese), and their VRF is rebadged Samsung (Korean). JCI teamed up with Sanyo (now Panasonic) years ago to offer Sanyo's rebadged Eco-i VRF series as their own,...

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furnace bonnet temp (before evap) should be limited to 88F max. This will prevent overloading the indoor coil, which is now in cooling mode, with too much heat. it also should keep discharge air no...

The EEV in each evap maintains its own superheat, typically 1-5F. As EEV's open to lower the superheat (when load increases), the suction pressure rises, which tells the compressor to speed up. The...

What you have is an oversized return and undersized supply for the 2.5-3T system you think is needed. With the oversized blower, and total static of the combined supply/return/registers there, you...

Wogpa, thanks. That sounds like a great idea and may get me close.....2 spd ODU is cooling only and I could connect it as non-communicating instead, but wouldn't dual fuel configuration want to run...

kfitman....I'm not sure that you are grasping the situation completely. I could very easily do what you describe if I had a conventional system with a 24V AC thermostat and W output connected to the...

Thanks for the replies but I'm not understanding completely....

The 4 wires to the smart sensors, zoning panel, furnace and condenser are (2)RS232 data + (1)24vH + (1)24vC. The 24v terminals in...

Ok guys, I've been out of the field since before these things came out and moved into commercial service management. Looking for some help from those of you that work with this stuff everyday.
...

Hey guys,

A little out of my league here but I think I may have a room sensor wiring issue.

This controller has a generic stat wired into smart sensor terminals. Seems that smart sensor...

Model#: ERGW00121A Mfg#: P6819106F
Part Number Description Substitution
A3326003 CLAMP, HOSE
A3326801 GROMMET OBSOLETE
A3335502 STRAP, EXPANSION TANK
A3414405 MANUAL, INSTALLATION...

Sounds like there might not be enough water flow. Normal water TD in the heating mode should be 10F, 15F max. 12 to 20max in cooling. Also, with 41F entering water, sounds like an open loop using...

I may have the exact new EZ zone controller. What is your part#?

Does anybody know who makes a generic LWC? Looking for an alternative to making our own 4H/4C temp ctrl panel with hi/lo alarm and pump lead/lag/flow fail rotation. No interface to WHSP's or external...

You'd better get that heater looked at. 110 degree rise is a clear indicator that something is wrong. Typically, gas furnaces are rated for 35min to 75 max temp rise through them. You may have an...

maybe an A14 tip was used to solder the valves in without disassembling them first?

is what you may need, not just the board. If your unit requires, the kit may also contain a crankcase heater. Some don't need a heater, but best to check before putting in a board only. Yes, heat...

There is no reasonable economic balance point where the fossil fuel furnace is more efficient than the heat pump, until it's about -10F outside, when the heat pump's COP is at .95 (equal to the...

Balance point is the point where the heat pump's output becomes equal to the heat loss of the structure. With a proper heat loss calc and performance ratings of the equipment, this can be plotted in...

only has one compressor and one reversing valve. Therefore, there would be no way it can produce heating and cooling at the same time. Also, I believe most brands will require that all tstats be...

that means the length of just one of the tubes. The full factory charge amount must be in the system, not half of it. If single tube length is over 100', then additional refrigerant is needed

The...

Wow!- saturated would be the little temperature scale thingy on the inside of your gauges or maybe even the temperature on a p/t chart. Scary

as the Eco-G is not yet available in the U.S. It is a gas engine driven VRF heat pump powered by a precision Nissan engine. Great stuff- can't wait til it's available here.

is this a heat pump? It does not sound that way from some things in your posts. If it is a gas or oil furnace as it sounds, it is unlikely that your system needs to move 2000 cfm in heating. Probably...

sounds like the hp may be going off on high head from when it was run to cure mud sanding. have you checked the filter and indoor coil?

as for the sizing, 800 sf/ton is plenty for a home insulated...

http://www.antiqueplumbingandradiators.com/

Check out what I'm selling under the same name on Ebay. More stuff to add- temp controls, EZ Zone parts etc.. Thanks

If Cam-Stat FALTS-x type limit used in old Yorks, it was prone to voltage drop under the load of the ign module after some time. Will read ok when no load, but may also be intermittent.

10 ton pkg unit & duct installed left this way by a union fitter shop (without a tin-knocker sub). Got the call to see why it wouldn't work. Yes, that's 8" 30ga pipe. Enjoy


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such as hot gas bypass on this system? I have seen many a tech overcharge mistakenly by trying to clear a glass when running at part load. Just a thought

absolutely , door off = less resistance = more airflow = higher amp draw

please tell us what things keep you where you are, or that would make another employer more attractive. assuming equal hourly pay, please list the other benefits and employer...

Eddie, if the machine is configured as you describe, and exhaust air from the bldg does not get drawn thru the condenser coil by the fan, I would agree that there may be a problem when mech cooling &...

sounds pretty cool, never seen it. a pic would help. but you say in the econo mode, so how does that affect the mech cooling/refer cycle. what exhausts the air in oher situations

but it sounds like you are confusing very different functions.

min oa is just what it says. while using the same dampers and actuator, it has nothing to do with econo function. it's function is to...

http://www.reverberray.com/

do in fact have aux occupied spst n.o. dry contacts a1 and a2. 2000 series 7300's even have spdt a1,a2 and a3. alot of rtu oem's use the n.o. contact to disable min pos oa during unocc periods- wired...

on the space sensor- should make the maxitrol go to full fire- confirm it is by dc volt reading at valve (5v?)- then check manifold pressure under this condition with a manometer & compare to hi-fire...

ok, sounds like you've made some improvements to the house. not telling you 60k is not enough- I assumed your house was built in the 50's or earlier by the boiler age and have never seen exterior...

give you an exact heat loss on your home without knowing anything about it's age, construction, r-values, u-factors etc..
Ashrae winter design temp for Philly is 14. Personally, I would design for a...

has the right idea- tower fan should be controlled by water temp entering condenser (typ set at 90). Sounds like you may have 2nd stage circuit bringing on fan by it's head pressure when the first...

the mixed air sensor absolutely belongs after the evaporator coil. The mixed air sensor's function is to provide temp input to the econo control. When there is a call for 1st stage cooling, and oa is...