Question about Ruud UBHC Air Conditioner

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My supply air is 75-f ????? my low side psi is 69 my high side psi is 350 w/ outdoor temp @ 95-f my a-coil temp is 45-f my return air temp is 78-f R-22 system why cant i get a 15 degree split???????????????

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  • dustin2267 Jul 31, 2010

    supply air is 75

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Sounds like you have a dirty condenser coils that need cleaning if that does not work check the freon level and if charging doesn't work the compressor may be victim to test this spray cool water on the condensor coils and at the same time see if your high pressure drops if it does....compressor needs replacement. Should be 45-50 low/250 high depending on humidity.

Posted on Jul 31, 2010

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  • Ruud Master
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You left out the temp of the air at the register. The fifteen degree split is the difference between the supply air and the air that is coming out of the vents.

Posted on Jul 31, 2010

  • Brad Brown Jul 31, 2010

    What size is the duct work? How long are the runs and what is the CFM of the fan?

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1 Answer

74 psi on the suction side of a 1/12 ton 2 -22 home condenser unit ok?


the psi on your unit will fluctuate ...dirty filter will cause it to be lower'' high humidity will cause it to be higher,,, the perfect scenario is 95 outside, 75 inside with 50 percent humidity,,, then it should read 68 psi which is a 40 degree coil temp. only when these conditions are perfect will your psi be 68psi

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What is the ac gas pressure for mercedez 200c


Gas pressure for ac can be determined by the type of refrigerant not the model of the car. The outdoor temp will also be a major factor. 134a low side while its running could be around 35 psi to 45. While filling track temp of air supplying your vents and you shoul get a 15-20 degree differential form outdoor.

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1 Answer

Low side and high side readings


pressure readings vary depending on temperature, humidity, and other factors such as coil condition (inside and outside coils) ducting, other mechanical issues. The is no absolute readings for any one type of system, that said a ball park reading with an outdoor temp of 90deg and an indoor temp of 78deg it would be around 65 to 70 psi low side and 150 to 210 psi high side.

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Above 78F no longer works gives heat head pressure is 300 and slightly above while low side varies bet 45 and 55 psi,noise in the return. i have about 85 feet of coil run 3/8 high side and 3/4 return from...


Your head pressure is a little high, depending on the ambient temp and your suction pressure is a little low. The suction pressure should be around 68 psig, the equivalent of a 40 degree coil. You can try adding a little refrigerant, check your compressor amp draw. If head pressure keeps going up and suction doesn't come up you may have a restricted metering device or filter dryer

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Low side pressure specs for 2003 silverado2500hd


Ambient Air Temperature
Relative Humidity
Service Port Pressure
Maximum Left Center Discharge Air Temperature
Low Side
High Side
13-16°C (55-65°F)
0-100%
150-246 kPa (22-36 psi)
730-1190 kPa (106-173 psi)
12°C (54°F)
19-24°C (66-75°F)
Below 40%
150-280 kPa (22-41 psi)
900-1390 kPa (131-202 psi)
14°C (57°F)
Above 40%
179-137 kPa (26-46 psi)
990-1500 kPa (144-218 psi)
16°C (61°F)
25-29°C (76-85°F)
Below 35%
218-328 kPa (32-48 psi)
1240-1640 kPa (180-238 psi)
17°C (63°F)
35-60%
236-342 kPa (34-50 psi)
1290-1680 kPa (187-244 psi)
18°C (64°F)
Above 60%
250-365 kPa (36-53 psi)
1340-1760 kPa (194-255 psi)
20°C (68°F)
30-35°C (86-95°F)
Below 30%
266-386 kPa (39-56 psi)
1500-1940 kPa (218-282 psi)
21°C (70°F)
30-50%
280-397 kPa (41-58 psi)
1540-1990 kPa (224-289 psi)
22°C (72°F)
Above 50%
300-430 kPa (44-62 psi)
1600-2070 kPa (232-300 psi)
24°C (75°F)
36-41°C (96-105°F)
Below 20%
328-439 kPa (48-64 psi)
1810-2240 kPa (263-325 psi)
25°C (77°F)
20-40%
337-457 kPa (49-66 psi)
1840-2290 kPa (267-332 psi)
26°C (79°F)
Above 40%
355-474 kPa (52-69 psi)
1890-2340 kPa (274-340 psi)
27°C (81°F)
42-46°C (106-115°F)
Below 20%
391-491 kPa (57-71 psi)
2130-2500 kPa (309-363 psi)
29°C (84°F)
Above 20%
397-508 kPa (58-74 psi)
2160-2550 kPa (313-370 psi)
30°C (86°F)
47-49°C (116-120°F)
Below 30%
451-552 kPa (65-80 psi)
2420-2790 kPa (351-405 psi)
33°C (92°F)

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1 Answer

How do you tell if a goodman ck36-1b has proper level of freon.Lets say it is 75 degrees outside and I added to where the low side reads around 30 and the high side is around 120-130.(orignal problem was...


The correct way is to evacuate the system,pull a vacuum then charge with a refrigerant scale.
In lieu of that you can charge by pressure and get close.
Normal operating pressure would be 68 psi on the suction side and about 225/275 on the high side.
You do have to calculate the outdoor and indoor ambient temperature.
At your 75 degree outdoor air a low side pressure of 60 psi or higher would be acceptable.
Your 30/130 is too low.
Add more refrigerant.

Make certain the indoor coil is clean and the fan motor is working correctly.
Have the leak repaired.

Apr 25, 2011 | Heating & Cooling

1 Answer

Low charge?


System is running a 24°F superheat and a 0°F subcooling at those readings. Saturation temperature is approx. 30°F lower than return air temperature.

Indications are of a low system charge. Ensure all your filters are clean and there are no obstructions that are limited airflow across the evaporator coil. Ensure the coils are clean and not frozen up.

Have it checked out. Looks like a low charge but can't tell without being in front of it. As far as normal ranges, that all depends on many factors. Based upon the info you have supplied, I would guesstimate that the operating pressures would be in the neighborhood of 350/160 to start and get the subcooling and superheat in check.

Jul 31, 2010 | Weather King 12AJA3601AH Air Conditioner

1 Answer

Supply air is 74 degrees???????? low side


Because you have a ductwork problem. Look for leaks in the supply lines or a dirty coil not allowing sufficient airflow.

Jul 31, 2010 | Ruud UBHC Air Conditioner

1 Answer

What happens when the pipe freezes?


low freon charge or your inside evap coils are dirty,,,check yourevap filter and replace if its dirty..also check your evaporater coils to see if its dirty,,,,,,,if its dirty you will need to flush and clean it...with coil cleaner and water......if all is clean and evap has good air flow..........your freon charge might be low......check your pressures hi and low.........hi side should be around 220 to 250 psi and low side should be 68 to 74 depends on the outdoor temp and indoor temps............have a certified hvac tech check the pressures.............

high side line is the small copper line
low side line is the bigger copper line............

a feedback would be good if this helps anyone...

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2 Answers

Indoor unit temperature between 60F & 70F after R22 charge..


The pressure changes with temperature, it is not a true gauge to ensure a proper charge.

You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)

Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)

it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.

( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)

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