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Just to resolve this thread. I spoke to a Genteq technical support rep and he stated that the X13 motors can have any or all of the low voltage taps energized at once and the motor will simply run...

It appears to be an X13 motor using the low, low-medium, and medium taps. When the thermostat calls for first-stage emergency heat, the low and low-medium taps are effectively shorted through the...

I checked the Payne website and the only PH3Z units that I could find there were R-22 units. The one that I posted the schematics for is an R-410a unit. That may explain the discrepancy.

Sorry. I'm trying to keep the scan small. Here's the whole page. As you can see, the designation at the bottom shows this to be for PH3Z-B models. It's straight from the unit documentation.

The model number is PH3ZNB036000AATP.

Here is the connection diagram along with the ladder diagram which happened to be next to it.

It's a package unit.

I'll scan the whole schematic when I get home and post it. It will be a while.

I don't have the number in front of me. If I remember correctly, it is a Payne PH3ZNB. . . etc. 3 tons.

Note 5 states that if field installed heat strips are used, a change in motor speed may be needed.

The schematic indicates that the taps to the motor are control wiring since they are 24vac. ...

Here's a better scan of the schematic.

According to the schematic, W2 connects directly to medium speed (red) and FAN (green) connects directly to low speed (blue). There are no relays between the thermostat and the fan motor. Are there...

I have a three ton Payne heat pump with 15kW heat strips (little insulation in the house). Presently, the fan drives the low speed on the blower motor. When the first stage of strip heat is called...

Thanks for the explanation. So as the density of the gas decreases, the compressor begins to "gasp" for air (or rather refrigerant). So its capacity is consequently decreased.

I guess that I am trying to visualize the refrigeration cycle on a microscopic level again. I am thinking about a section of pipe in the suction line that contained only vapor. If that section were...

So much for theory. Thanks anyway.

I don't plan on heating the refrigerant line with a torch while the system is running (or while it contains refrigerant, period):).

Right. Each side of the circuit is theoretically "isobaric." I guess that the answer to the question is: The effect of superheat on the suction line pressure is only observable in the few seconds...

I understand that the suction pressure is the same throughout the suction line.

So how about a simple yes or no answer. Here is the scenario.

1) The system is properly charged and I have a...

beenthere, would you see this in the field?

Would it be:
66.0000 PSIG 13*F SH
66.0000 PSIG 26*F SH

In other words, if in order to get the additional 13*F SH (26-13), I stripped off the...

beenthere, I gather from this that probably you understand the question here. So do you think that there is no rise in total suction pressure due to SH or is it so small that it is negligible?

Right, (badbillr), but the superheat is the additional degrees above the saturation temperature at the measured pressure.

Maybe the "K. I. S. S." form of the question would be this. Would there...

The sum of the partial pressures of the two gasses.

Thanks.

So, the partial pressure of the gas and the partial pressure of the liquid both contribute to the total pressure of the suction line, but the additional partial pressure that the superheating of the...

I think I see. The refrigerant may have been at or even slightly below freezing, but it didn't have enough "umph" to win the heat of fusion fight with the ambient air to keep the condensate frozen.

Why?

If I read the temperature of the suction line without my guage on, there would be a pressure that is associated with that temperature that would be higher than what is the actual pressure is....