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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...

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