Replyincoming air to condenser is 72F leaving is 82F
Global Moderator
Unless your holding ice cream 🍦
Regular Guest
incoming air to condenser is 72F leaving is 82F
Regular Guest
temp right before condenser is 116F
Professional Member
Is this electronic and is it opening all the way? I will call heatcraft even though they were awarded the worst tech support in the industryOriginally Posted by Red850kid
Regular Guest
No I have not
Sent from my iPhone using Tapatalk
Regular Guest
No receiver on unit.From your comments about the frosted suction line, the test pressures that it says on the nameplate, and the fact that you seem to be more concerned with subcooling than superheat (on what I'm assuming is a unit that has a receiver), I can tell that you don't have much experience with refrigeration.
Does this thing have a receiver? If so, 18°F subcooling seems pretty high. Could this thing be overcharged, or are you sure that it still has the factory charge amount? On receiver systems, subcooling should NOT raise while you are adding refrigerant. If it does, that means that it's way overcharged and that the receiver is completely full. If this system doesn't have a receiver, then disregard what I just said, although 18° of subcooling would still be high even for a non-receiver system.
A plugged up filter drier might also be able to increase subcooling. Try taking a temperature measurement before and after the filter drier to see if it's the same on both sides.
Your head pressure also seems high for the 70° air that you say is around it. Are you sure it's 70° up there? Usually these things get installed in a confined space with poor airflow which causes the condensers to recycle the air over and over again, which causes the temperature to become much higher than that.
If those things actually check out, my next guess would be air infiltration. Is this thing sitting on the box correctly, with no big gaps where non-conditioned air could be getting into the box or the evaporator section? Is the door gasket in good shape and is the door closing correctly?
One last thing to check is the heated relief port thingy that's usually installed above the door. Make sure it's heater is working and that it's not a giant ball of ice inside of it. These things sometimes go bad and that basically creates a big hole where unconditioned air and humidity can infiltrate the box 24/7.
Keep at it, and get back to us with more questions and let us know if you figure it out.
Line temp before dryer is 83.7
Line temp after dryer is 84.2
Sent from my iPhone using Tapatalk
Regular Guest
Ok so I usually grab temp next to the pressure port. I clamped on inside the box on evaporator and got -2.7f and that gives me Sh of 4.5 according to my testo550.
Pressure on gauge is 40
Sent from my iPhone using Tapatalk
Professional Member*
Is there a sight glass moisture indicator?
SH of 4 1/2*F at the evaporator. What is it at the compressor?
Are the liquid suction lines soldered together or run separately?
ARP Committee / Global Moderator
Moved to Refrigeration & Ice Making.
VTP99 liked this post.
Regular Guest
no sight glass
when im at the compressor the SH is 22
they are run separate
Professional Member*
Attached is the manual
That's a drop in POS.
Make sure there is Nothing blocking the discharge air. Shelving, product Nothing!
R I P Icemeister
Supporting our Vet’s
http://www.soldierride.org/
http://www.woundedwarriorproject.org/
Red850kid liked this post.
Professional Member*
What is it, 4.5° or 22°?
There's not enough line set for a 15° rise in SH!
R I P Icemeister
Supporting our Vet’s
http://www.soldierride.org/
http://www.woundedwarriorproject.org/
Regular Guest
everything is clear of unit on inside and outside.
Regular Guest
in my opinion its 22F
the 4.5 was when i put the clamp on inside the box right next to the evaporator.
but i always thought where your test port is where you put your clamp at
Global Moderator
There must be a liquid/suction heat exchanger
Professional Member*
Not from the factory that I’m aware of!
Global Moderator
Where's the additional superheat coming from ?
Professional Member
How's the insulation on the suction line?
Is there a suction accumulator before the compressor??
Professional Member
Are you sure the condenser is clean? Did you wash it or just blow it out?
Global Moderator
It's close coupled like probably less than 3-4 '
