Carrier APU system installed on a semi truck sleeper

Specialty refrigerant diagnostics for non-standard mobile systems

R-404A and Custom Applications

Some truck and transport cooling setups are custom. If your application uses R-404A or another specified refrigerant, dispatch can match the job to a technician carrying the right recovery and charging equipment.

Refrigerants
R-134a, R-404A, custom applications
Brands
Thermo King, Carrier, RigMaster, Dynasys
Service
Recharge, repair, leak checks, diagnostics

Refrigerant focus

R-404A custom refrigeration

R-404A work should be matched to the exact application and refrigerant label. APU Recharge dispatches EPA certified technicians for recovery, recharge, and leak-check work.

01

Used in some low-temperature and

Used in some low-temperature and transport refrigeration applications

02

Requires correct refrigerant identification before

Requires correct refrigerant identification before charging

03

Best handled with leak documentation,

Best handled with leak documentation, evacuation, and charge records

04

Custom systems may need photos,

Custom systems may need photos, model details, and refrigerant labels before dispatch

Carrier auxiliary cooling system on a semi truck sleeper
Custom mobile refrigeration calls need the correct refrigerant and recovery equipment.

Compliance

EPA-minded refrigerant handling

Refrigerant service is both a cooling performance issue and a compliance issue. The right process keeps refrigerant contained and gives the driver a better repair record.

  1. Identify the refrigerant The label and service history matter before a cylinder is connected.
  2. Recover before repair Recovering refrigerant protects the environment and keeps the repair process clean.
  3. Vacuum before charging A deep vacuum helps remove air and moisture before the system is filled.
  4. Record what changed The driver or fleet should know what was charged, what was found, and what still needs attention.

FAQ

Questions drivers ask before dispatch

Straight answers help avoid the wrong truck, wrong refrigerant, or wrong tool showing up.

Do you service reefer-style or custom systems?

Dispatch can review the application, location, and refrigerant label to determine the right technician and equipment.

Can you mix refrigerants?

No. Refrigerants should not be mixed. The system label and service history should be confirmed first.

What if the system does not have a clear label?

We treat unlabeled or modified systems carefully. Photos and prior service records help determine the safest next step.

Call 800-554-0539