Aircon (1 Viewer)

[Lofty1]

Hi I recently bought an old rooftop unit (1998) on e bay for a whole £100 after a rewire new fans and top up it runs ok 12v with an outside temp of 21dg c it blows air at 10dg c is this blowing cold enough, I don,t want to fit it if not working correctly Thank,s

 

[gus-lopez]

Sounds like it will do the job to me.

 

[tacr2man]

You are getting a drop of 11c which is not bad , depends on the device , what make and model is it , as 12v compressor aircon would be very amp hungry I would expect , are you running thru inverter ? Lofty1

 

[Richard n Ann]

Yeah sounds like it's working. Has it really been "topped up"? Or is it the sellers sales talk? If it has been topped up it might not last long if it still has the leak.

Also what refrigerant is it on? 1998 is old and it might be on R22 which is now obsolete.

 

[Lofty1]

Yeah sounds like it's working. Has it really been "topped up"? Or is it the sellers sales talk? If it has been topped up it might not last long if it still has the leak.

Also what refrigerant is it on? 1998 is old and it might be on R22 which is now obsolete.

Hi I used a top up as it was only dropping 5dg but still had pressure in it, it has r132 in it from new

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[Lofty1]

You are getting a drop of 11c which is not bad , depends on the device , what make and model is it , as 12v compressor aircon would be very amp hungry I would expect , are you running thru inverter ? Lofty1 just testing on a battery as not fitted it uses a 12v motor driving a air type compressor ran ok for an hour without dropping the battery to far.

 

[Richard n Ann]

Hi I used a top up as it was only dropping 5dg but still had pressure in it, it has r132 in it from new

Where did you buy that refrigerant? Never heard of it, Wikipedia says it does exist and is chemically known as "Dichlorodifluoroethane" but gives no information about it. It's not in my Bitzer app either ?

 

[tacr2man]

If its run just from a single battery for an hour , then it suggests that the charge is still not at right level , and it is not drawing enough power to get down to correct level . If you can say what make it is then it would be possible to get better info . Usually a 12v aircon is a evaporative type due to power needed for compressor type . Mostly compresor type are 110/220v run thru an inverter and have a big draw, even with soft start !

 

[gus-lopez]

it might be on R22 which is now obsolete.

Apart from the cylinder in my shed

 

[Lofty1]

If its run just from a single battery for an hour , then it suggests that the charge is still not at right level , and it is not drawing enough power to get down to correct level . If you can say what make it is then it would be possible to get better info . Usually a 12v aircon is a evaporative type due to power needed for compressor type . Mostly compresor type are 110/220v run thru an inverter and have a big draw, even with soft start !

Hi it is a sunny airco 1400

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[tacr2man]

Hi it is a sunny airco 1400

I think that is 4400 , as here http://www.motorcaravanning.co.uk/shopuk/airco_12v_aircon.htm
looking at install manual it would seem that 8C/11f temp drop from inlet to outlet is par for the course
http://www.motorcaravanning.co.uk/pdf/DC_4400RM_installation_manual.pdf
big supply cables advised

 

[Lofty1]

Where did you buy that refrigerant? Never heard of it, Wikipedia says it does exist and is chemically known as "Dichlorodifluoroethane" but gives no information about it. It's not in my Bitzer app either ?

Sorry brain out of gear R134a