Question about Heating & Cooling

1 Answer

I have Mcquay AC unit with R- 22 that only has a LL service valve. No suction or discharge valves.how do I top off while running?

Posted by on

  • jmckeever446 Mar 28, 2011

    I just started working in this building. When I went to check out these units I discovered this. I never seen this before, no way to see suction psi. there is a sh.port on discharge. Do you have another suggestion on how to charge ?

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 43,501 Answers

Hi,
The only way to do that would be to heat the tank up with very hot water to the piont where the pressure in the tank is higher then the head pressure of the system while running.
Do it at the coolest time of the day so the head pressure is at it's lowest point...
Then also feed it in as a liquid so that you can get it in faster...

Just curious as to why there are no access points or service valves in the suction side of the system...do you have no access to even check the low side pressure???
Does the unit run 24/7 ???

You may even have to set the tank up so that it is in a water bath and then you keep heat under it as in a burner of some type to keep it hot enough to overcome the high side pressures...seems like it could be kinda tricky to do, but possible...

heatman101

Posted on Mar 28, 2011

  • D. Floyd Kolb
    D. Floyd Kolb Mar 28, 2011

    What type of compressor are they?? Sometimes you can actually charge through the oil port...what is the size of the units ??? Seems as though they sould be semi-hermetic type compressors that should have a crankcase and an oil port...the oil port is actually the suction side and it is possible to bleed refrigerant slowly into there...



    I was home for lunch and am headed back out, so I will not be getting back to you for a few hours now...

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What would cause high suction pressure 134a Freon?


to start with it will be high vacuum reading as suction is low pressure
secondly it means that the system is vacant of any gas and is well below 0 psi
if it is a high discharge pressure ( after the ac compressor) it means that the condenser is not being cooled by the fan or you have excessive gas in the system or the tx valve is blocked
I strongly suggest that you seek the services of an accredited ac specialist shop as r134a gas runs at a lot higher pressure that the r12 or r22 gas before you do serious damage to the ac compressor and system

Jul 19, 2015 | Cars & Trucks

1 Answer

Conair mini split heat pump isn't cooling but has cold suction line but warm liquid line and is not freezing up the evaporator. Thinking a sucking reversing valve?? What could cause that? Both evapor


Make sure that your refrigerant charge is good first. Reversing valve has 4 pipes coming off of it. The one alone is discharge and centre of 3 is suction always. The two sides are the reversing pipes. One side should be same temp as discharge and other same temp (+-5F) as suction. If not then you have bypassing refrigerant in valve. Bad.

Jul 13, 2013 | Heating & Cooling

1 Answer

2 ton condensing unit w/ 3 ton evap 100 suction 175 discharge


Hi,
The orifice or the expansion valve are for a three ton unit and you only have a 2ton...so too much gas is going through causing low discharge and high suction... install correct orifice or TXV and you'll be okay...

heatman101

Aug 03, 2011 | Goodman CKL24AR24 Air Conditioner

1 Answer

How to add freon to a Haier hwr10xc6 Thru-Wall/Window Air? i accidentally damaged one of the copper lines & all the freon came out but i welded it back together put how to at it & where? help!


If the unit has no existing service valves you will have to purchase some - and braze them into the freon lines. Valves (with valve cores) can be purchased at a AC Supply house fairly cheaply and then you can braze them into the lines. One in the suction (big line that gets cold) and one in the liquid line (the one that gets warm). NOTE: be sure NOT to weld this into the 'discharge line' (one straight out of compressor).
Once you have the two valves welded into the unit - you can then charge the unit.
Good Luck!

Jun 24, 2011 | Haier hwr10xc6 Air Conditioner

1 Answer

Method to assist proper pumpdown of a heatpump system.


Pumpdown is the storing of all refrigerant in the condensing unit..if that is what you are trying to do, the procedure is to , install gauges,close the discharge service valve, manually close the contactor and watch the low side gauge until you just barely have positive pressure, then close the suction service valve.

May 04, 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

2 Answers

How to set up my onga pump and filter its about 8 years old but looks like the currant model.just got it and they didnt have instructions bugger.


We begin at the suction line. I'll assume that you will be using this as a
pool pump since you have a filter. At the suction line, install a horizontal
or a vertical check valve along the suction pipe. Then the suction pipe
is connected to the bottom pipe adapter of the filter. The top pipe adapter of the filter shall be connected to the pump suction adapter. At the pump discharge adapter, install a GI Pipe Tee. At the bottom of the GI pipe tee, put a GI nipple going to the pump discharge adapter. Opposite it shall be the pipe plug to serve as the priming port. At the GI pipe cross, install a GI nipple about 6-inch long with a service **** to balance water flow. At the end of the service **** install another 6-inch GI nipple to attach a gate valve to control water flow. After the gate valve
is the discharge pipelines going back to the pool.

Note: Pump must be installed within 3 to 5 meters near the water source. You may install more than 5 meters but suction could be difficult for the pump.

Priming the pump:

Open the plug at the tee that serves as the priming port, Fill this up with
water to full level with the service **** at full close position. Once filled
up, replace and close the priming port. Put the power on, and start the
pump running, then slowly open the service **** or flow control valve
to appropriate level.

Just send your e-mail for further assistance. Thanks.

Aug 19, 2009 | Plumbing

1 Answer

Bon-Air mini split 1.5 ton, suction and discharge pressures are equal. discharge valve has ice on it. and the suction and compressor are very hot.


Sorry to sat but the tech has no idea what he is doing. The metering device is in the discharge valve, making that line a low pressure, not high. If the "suction" line is hotthen it is running in heat mode.

Jun 25, 2009 | LG LS-L1210CL Mini Split Air Conditioner

1 Answer

2000 ford taurus low end ac valve


please rate as fixed if this helps you.

The low pressure service gauge port valve is located on the evaporator to accumulator/drier suction line.


The evaporator to accumulator/drier suction line contains low pressure refrigerant gas and is equipped with a serviceable low pressure A/C charge valve port.

Apr 28, 2009 | 2000 Ford Taurus

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

43 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

paulcarew

Level 3 Expert

2461 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...