Ducted and central recharge
AC refrigerant charging in Industrial City
In the Industrial City south of Jeddah, factories and distribution centres with very high thermal loads run large AC systems with powerful compressors. Alrabih's team reads the suction and discharge pressures with precision, checks for leaks under operating load, then charges to the exact specification.
- Accurate pressure readings
- Charge recovery
- Nameplate-type charge
Clients We're Proud to Serve
Organisations and companies that trusted Alrabih with their projects.
When your system needs a refrigerant charge
- 1
Uneven cooling across zones
One office or floor feels hot while the rest of the building is cool. Before adding any refrigerant, the technician reads pressures and temperatures at several points to confirm that a low charge is actually the cause.
- 2
After a repair or component swap
Replacing a compressor, a valve or any part that opens the circuit means the old charge escapes. It must be recovered with a dedicated machine, then the line is vacuumed and recharged after the repair is done.
- 3
A system restarted after long shutdown
A central or rooftop unit shut down for a full season in Jeddah's salty coastal air may have lost part of its charge. We verify with pressure readings before adding anything, and look for a leak if the readings point to one.
Who it's for
Your villa's ducted system has lost its cooling
We read system pressures and line temperatures, find any leak in the long pipe runs, then vacuum and charge to the refrigerant type on the unit nameplate.
Ask on WhatsAppYour building's rooftop unit cools unevenly across floors
We inspect the system and its drawings, measure pressures and temperatures at multiple points to find the cause, then recover the old charge if a repair is needed and recharge to the nameplate type only.
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What the charging work covers
- Suction and discharge pressure readings
- Liquid and suction line temperatures
- Old refrigerant charge recovery
- Line vacuum before recharging
- Charge to nameplate refrigerant type
How we work
How we work
- 1
System check and readings
The technician checks the unit nameplate and system drawings, then reads suction and discharge pressures and line temperatures to judge the actual charge condition.
- 2
Find and fix the leak
If readings show a low charge, the technician finds the leak in the long line set, joints or components, and repairs it before any refrigerant is added.
- 3
Recovery and vacuum
The remaining old charge is recovered with a dedicated recovery machine, then a vacuum pump removes all air and moisture from the line before the new charge goes in.
- 4
Charge and verify
The system is charged with the refrigerant type on the nameplate only, never mixed with another type, then pressures are read again and cooling is checked across all zones.
Careful charge or a random top-up?
| Alrabih | The usual way | |
|---|---|---|
| Diagnosing the cause | Pressures and temperatures first | Add refrigerant straight away |
| The leak | Found and fixed before charging | Left to repeat the problem |
| Old charge | Recovered by machine | Vented to atmosphere |
| Refrigerant type | Nameplate type, no mixing | Whatever is to hand |
| Long line sets | Joints checked along the full run | Checked at the unit only |
Everything your AC needs, from one team
From system design and duct fabrication to installation, commissioning and maintenance.
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Some of our work
Ductwork, rooftop units and diffusers, from work we've completed in Jeddah.
Customer reviews
What our customers say
- Muhammadramzan 2641
“MashaaAllah. Services are so good. Behaviour and kindness 100/100. Prices are less then Market. Fully recommended”
- shahzeb armani
“Wow. Prices are so comfortable. Outstanding services. People are so talented and nice”
- Tawfik AlyawerLocal Guide
“U can find all u need for air conditioning”
Your satisfaction matters to us! If you had a great experience with us, we'd love a 5-star rating and a kind review.
Worked with us? Leave a reviewService areas
We come to you anywhere in Jeddah
From Al Shiraa and Al Yaqout in the north to Al Thaghr and Al Quraiyat in the south, with our base in Al Aziziyah.
What sets this district apart
The Industrial City houses factories and production workshops with vast floor areas and very heavy thermal loads from machinery and processes. The AC systems here are huge and run continuously, with pressure and temperature changing throughout the day. Reading pressures precisely under actual operating conditions and full load is critical to avoid undercharging or overcharging, otherwise the compressor risks damage or efficiency falls sharply.
The Industrial City lies in Jeddah's industrial south, a zone of factories and distribution with heavy thermal loads and massive AC systems.
Industrial City's factory AC systems operate under very high pressures and need precise seasonal charging because load varies with production cycles.
The AC setup in Industrial City
- 1
Multi-zone AC system with high-capacity compressors
Industrial City factories use systems with multiple compressors or one very large one serving separate zones, requiring unified precise charging.
- 2
Thick copper lines running long distances
Factory piping is thick and runs very long distances, making charging precision critical to compensate for pressure drop along the lines.
- 3
Multiple outdoor units on roof or building side
Large factories may have multiple outdoor units, each requiring separate pressure readings and individual precise charging.
Before the visit
Before our visit in Industrial City
- 1
Locate all outdoor and indoor units
Tell us the location of each outdoor unit and indoor branches and the distances between them, since this affects pressure-reading accuracy.
- 2
Ensure safe access to gauge ports and vents
We need to open the gauge ports on the lines, which may be at height or in tight spaces, so ensure safe access and provide a ladder or equipment if needed.
- 3
Tell us the production schedule and operating hours
We charge under actual load, so tell us when full production and peak hours occur so we can choose the best time for precise readings and charging.
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FAQ
Questions about AC refrigerant charging
Why can't a second refrigerant type be mixed into a ducted system?
Every refrigerant type is matched to a specific compressor, lubricating oil and operating pressures. Mixing two types shifts the pressures and contaminates the oil, straining the compressor and ruining cooling performance. We read the nameplate type and use only that.
Can a rooftop unit be recharged without shutting the whole building down?
In most cases one rooftop unit can be worked on while the others keep running, but this depends on how the system is designed and how many units it has. The technician reviews the system drawings at the survey and decides the approach that causes least disruption.
What do pressure and temperature readings tell you about a central AC system?
Suction pressure and gas line temperature show how well the evaporator coil is absorbing heat, while discharge pressure and liquid line temperature reveal condenser performance. Comparing both sets against the manufacturer's values shows whether the charge is low, high or whether another component is the real problem.
Why is the old charge recovered rather than just released?
Releasing refrigerant to the air damages the ozone layer and is prohibited. Recovery keeps the gas for proper recycling or disposal. In large systems the charge is substantial, so recovery both protects the environment and avoids losing a costly material before the repair is complete.
How does charging a ducted system differ from charging a standard split unit?
A ducted system has much longer refrigerant line sets and a larger charge, so a shortage takes longer to appear and leak-finding covers a much greater length of pipe and joints. Pressure readings must also be compared against the manufacturer's values for the whole system, not just a single indoor unit.
My factory floor is cool but the upper storage is very hot, is the refrigerant insufficient?
Not necessarily. It could be an airflow distribution issue or a leak in the upper branches. We measure suction and discharge pressures on each section separately to find the real cause.
The industrial site is huge and the outdoor unit is far away, how do you reach it?
We agree with you on the outdoor unit's location and the easiest access route from the main gate, and identify a safe parking point before the visit.
Intense summer heat increases compressor load, does this affect charging?
Absolutely. We charge under actual operating conditions and full load, not on cool days. This ensures the pressure is correct at peak load.
The three-phase electrical circuit is old, does it affect the pressure reading?
It does not directly affect the reading, but we check that all phases are balanced and the compressor runs at full capacity during testing and charging.
