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Posted by Tony on August 18, 2007, 9:43 am
Common guys have you ever read the gauge standing on your head
> Outside heat pump unit is a Lennox HP26. No colling the other day.
>
> All observations at outside unit.
> Suction side pressure is 150 psi all the time, high side is always 0
> psi. Even after unit has been off for a day, pressure does not
> equalize. Even when unit is on, compressor getting hot, pressures do
> not change. Sounds like compressor makes a hum sound every 5 minutes,
> like its trying to start, and the current to the compressor rises for
> that short time.
>
> Also I don't really see any current going into the compressor with a
> clamp on ammeter except for that 2 second time period, every 5 minutes
> or so, even though the compressor is getting hot (strange).
>
> Tried going to heat cycle to switch reversing valve, pressures stay
> the same, and nothing else changes.
> Oil is all over bottom of unit and inside fittings near top of all
> tubing, valves, etc inside unit. Oil is not just on bottom of unit.
>
> 1. Should not the pressures equalize after unit is off for a while ?
> Why does the low always stay at 150 ?
> 2. Seems like oil and charge came out of high side, being its always
> 0 ?
> 3. Does this seem like an outside compressor/valve problem and not
> inside air handler/expansion valve problem ?
> 4. Could I force a voltage on the reversing valve with a power supply
> and see if it switches, and should the pressure release to a more
> normal value on the low side ?
>
> TIA
>
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