Ducted and central recharge
AC refrigerant charging in Old Airport
In the Old Airport area, central Jeddah, commercial buildings and warehouses rely on large central or package AC units covering substantial spaces. When some areas cool poorly whilst others run fine, refrigerant loss may not be the cause; precise pressure and temperature readings reveal the true leak or blockage.
- 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.
Ask on WhatsApp
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.
Split AC installation
Request this serviceDuct installation
Request this serviceCentral AC installation
Request this serviceDuct fabrication
Request this serviceCold room installation
Request this serviceElectro-mechanical works
Request this serviceChiller & AHU installation
Request this serviceHVAC design
Request this serviceAC repair & faults
Request this serviceAC cleaning
Request this serviceRefrigerant charging
Request this serviceCentral AC maintenance
Request this serviceChiller maintenance
Request this serviceAC removal & refitting
Request this serviceDuct cleaning & sanitising
Request this serviceAC servicing by brand
Request this serviceOperation & maintenance contracts
Request this serviceAHU maintenance
Request this serviceFridge & freezer service
Request this serviceCold rooms
Request this serviceDisplay fridges & chillers
Request this serviceFactory HVAC
Request this serviceWarehouse HVAC
Request this serviceVilla & home HVAC
Request this serviceHotel HVAC
Request this serviceSchool HVAC
Request this serviceHospital HVAC
Request this serviceMosque HVAC
Request this serviceMall & retail HVAC
Request this serviceRestaurant & cafe HVAC
Request this service
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 Old Airport is a commercial and industrial zone with warehouses, workshops and office blocks, where AC systems serve large areas through long duct networks and multiple dampers. A large system leaving some zones warm whilst others cool may have a small leak, a blockage in a duct branch or a faulty main damper rather than low refrigerant. Measuring pressure and temperature at multiple points along the main line and branches pinpoints the exact problem.
The Old Airport area sits in central Jeddah, a commercial and industrial zone of warehouses, workshops and office blocks using central ducted systems.
Most warehouses and workshops in the Old Airport zone run large central AC units serving hundreds of square metres through extensive duct networks.
The AC setup in Old Airport
- 1
Large central units serving vast spaces
Warehouses and workshops rely on powerful outdoor units and main ducts branching into multiple zones.
- 2
Large, complex air damper systems
Large networks need multiple dampers and control vents at various points; any blockage here leaves zones warm.
- 3
Outdoor units on roofs or open yard spaces
Outdoor units in the Old Airport zone sit on roofs or open yards, allowing straightforward access for measurement and work.
Before the visit
Before our visit in Old Airport
- 1
Map which warehouse zones are cold or warm
Give us a rough layout of which areas cool well and which stay warm, so we can focus readings on the suspect branches.
- 2
Clear safe access to the outdoor unit
Ensure the team can reach the outdoor unit on the roof or open space safely, without obstacles or hazards.
- 3
Supply system nameplate and refrigerant type
Finding the nameplate on the outdoor unit and telling us the refrigerant type listed before we visit saves time.
More districts for AC refrigerant charging
Other services in Old Airport
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 large warehouse has cool and warm spots. Is it low refrigerant?
Not necessarily. We measure pressure and temperature on the main line and each branch to check for leaks or blockages before any charge.
The ducts run under floors and through walls. Can you access them for diagnosis?
We measure from the standard access ports on the outdoor and indoor units, and use any inspection taps in the network directly without excavation.
The extreme heat in my warehouse in summer affects the readings?
Yes, high heat skews pressure and temperature readings, so we choose measurement and charging times when conditions are milder, or adjust readings for ambient temperature.
How long does measuring before charging take in a large warehouse?
It depends on the number of branches and points to measure; typically an hour or more to ensure thorough diagnosis of the full system before any work.
