Question about Delfield 406 / 406-CA Refrigerator

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Suction psi 30 liquid line 275 upon start up

Unit is an undercounter delfeild 406 1door refer. customer related not getting cold. Tap the line suction psi 30 liquid line 275 upon start up is it normal..404 A refrigerant

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Seems a bit hi depoending on ambiant,
but you should be running like 160-10

Posted on Oct 04, 2009

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Dec 08, 2015 | Hobart Undercounter Glasswasher w/Chemical...

1 Answer

A/c in tahoe take a while to get cold


it depends on the condition of your a/c unit, attached the manifold guage check the high side and low side if the high side is above 275 psi clean the condencer . and if the lowside is below 30 psi probably theres a leak on the unit

Jul 07, 2014 | 2007 Chevrolet Tahoe

1 Answer

Goodman unit runs and at the a-coil there is a piston where your suction and liquid lines connect. On the liquid side the piston is cold but warm on the other side of piston. A/C unit will not cool.


That piston is the metering device. On the liquid line, before the metering device it is always warm (this is sub cooled, high pressure liquid), but should flash to low pressure, lower temperature vapor once it passes through the metering device. The suction and liquid line never connect together.The liquid line brings liquid from the condenser to the evaporator. The suction line brings super heated vapor from the evaporator to the compressor. Since the unit does run, I'd have to put a gauge on it,but if I had to guess, I'd guess you have high head pressure. Check for dirt or debris on the condenser, check for proper clearance of the condensing unit and check for operation and directional rotation of the condenser fan. This could also be the result of an over charge.

Aug 26, 2013 | Goodman CKL36AR36 Air Conditioner

1 Answer

Unit is freezing up


what type of gas?
if R410A it too low
if R22 check for inside air flow

Jun 23, 2012 | Gibson Nordyne/2 Ton Heat Pump Package...

1 Answer

Hoi... We have a Condura split aircon of 1.5 hp. 12.000 Kj/hr -R22 The in- and outset unit needs cleaning and has to be disconnected from each other. Here's my question: After connecting again and...


Hi Frans! I'm Roger. I have never had to disconnect the Evaporator from the Condenser to clean them but here is your answer. Use the access valves on the liquid side of the condenser. After evacuating, let the vacuum pull liquid R22 into the liquid line access valve to about 80 gauge pounds and close your refrigerant port on the manifold. Start the unit and add GAS to the suction port to bring your pressure up. If you have a scroll type compressor you can add liquid to the suction port but add gas just to be safe. Exactly how much you add depends on the efficiency of the compressor and how cold you want the discharge air to be. Normally we shoot for 34 to 40 degree evaporator with 18 to 25 degree temperature drop across the coil. R22 at 34 degrees is 60.2 PSI (Pounds per square inch) on your compound gauge. That's normally blue and on the left side of the manifold. The gauge that's hooked to the suction line. 40 degrees is 68.6 PSI. The amount it will take depends on the size of the condenser and length of your line set. Watch the amp draw on the compressor while charging. The name tag will have an RLA or FLA number that is the normal operating amperage of the unit. Add gas on till the suction line is cold at the compressor, then wait 5 or 10 minutes for the system to stabilize. Adjust you pressure again and you should be done. Let me know if you need anything else and if so, be as specific as possible. Roger

Apr 20, 2011 | Heating & Cooling

1 Answer

When i was fixed a problem in central ac trane i found decreased in freon r22 and the suctione line was freezed, i charged the ac with froen gas r 22 then i found that the suctione line changed and begin...


You are still low on freon. Charging AC by superheat and subcool
First charging a unit by superheat, this is only for Acs with an orifice or capillary tube.
Optimum superheat is 12° to 15° at the compressor or suction line outside the unit.
Hook up your gages and put a thermometer on suction line (large line), start the AC. Measure the temperature of the suction line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant, (you can also use a temperature pressure chart), now read the thermometer, let’s say the suction temperature( the thermometer) is 67° and the saturation temperature (the gages or temp. press. Chart), is 55°, subtract the saturation temperature from the suction temperature, 67°- 55° = 12° superheat.
Charging by Subcooling, this is for Acs with a thermostatic expansion valve, it’s common to see a sight glass on the liquid line (on these units with a sight glass just clear it, when, indoor room is at approximate set point of the thermostat). Optimum sub cooling is 12° to 15° at the outdoor unit.
Hook up your gages and put a thermometer on liquid line (small line), start the AC. Measure the temperature of the liquid line and read the pressure on your gages. Theres a temperature scale on your gages for R-22 or R-410A the needle will show you the pressure on the outer scale and if you follow it down to the R-22 or R-410a inner scale that is the saturation temperature for that refrigerant,(you can also use a temperature pressure chart), now read the thermometer, let’s say the liquid temperature( the thermometer) is 100° and the saturation temperature (the gages or temp. press. Chart), is 114°, subtract the liquid temperature from the saturation temperature, 114°- 100° = 14° subcool.

Oct 05, 2009 | Heating & Cooling

1 Answer

Sandwich prep refrigerator too warm.


It sounds as though you have a clogged capillary tube, cannot be sure without suction and liquid line pressures and temps but if you can, ask the tech if the suction pressure seemed to be low, if so, replace the capillary tube with the proper length and diameter tube, replace the liquid line dryer and pull a GOOD vacuum on the system and recharge it, refering to the rating plate for the proper amount and type of refrigerant.

Jun 22, 2009 | Fogel FOG-FLP4512 Undercounter Sandwich...

1 Answer

Compressor of intertherm cond unit MTL-011548BAV shorted. Replaced with 4 ton (48,000) complete cond unit. Now, suction line frost back to compressor with R-22 suction pressure too low (50#). Why? and...


make sure coil and fan are clean and getting good air flow thru the coil and not bypassing it if discharge psi ok air flow problem if high then somthing in unit stopped up some have screens in the liquid line at the coil hope this helps also make sure fan is going the right way! on indoor unit repost psi and temp readings on both lines and indoor and out door temps thanks

Jun 07, 2009 | Heating & Cooling

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