Maxron R407C is a non-ozone-depleting HFC refrigerant blend used in residential and commercial air-conditioning and medium-temperature refrigeration systems. It is also used for selected R22 retrofit applications, where the equipment design and manufacturer requirements allow the change.
R407C is a zeotropic blend of R32, R125, and R134a. Its composition is 23% R32, 25% R125, and 52% R134a. The blend suits applications such as unitary air conditioners, heat pumps, chillers, and commercial refrigeration equipment.
For R22 retrofit work, technicians must check the system before conversion. A retrofit may require changes to the lubricant, seals, charging procedure, or other system components. R407C should not be treated as a simple drop-in replacement for every R22 system.
Key Features
- Refrigerant: R407C
- Type: HFC zeotropic blend
- ODP: 0
- Non-flammable
- Non-toxic under normal handling conditions
- Suitable for AC and refrigeration applications
- Used in selected R22 retrofit systems
- Requires POE lubricant
R407C Applications
Maxron R407C can be used in compatible equipment such as
- Residential air-conditioning systems
- Commercial AC systems
- Unitary air conditioners
- Heat pumps
- Non-flooded evaporator chillers
- Medium-temperature commercial refrigeration
- Supermarket display cases
- Similar R22-based refrigeration equipment
R407C Refrigerant Composition
| Component | Composition |
|---|---|
| R134a | 52% |
| R125 | 25% |
| R32 | 23% |
Lubrication
R407C requires POE (polyolester) oil because its refrigerant components do not provide the required compatibility with mineral oil and alkylbenzene lubricants.
POE oil absorbs moisture quickly when exposed to air. Therefore, keep the refrigeration system and oil container sealed during service and limit exposure to atmospheric moisture.
Physical Properties
| Property | Value |
|---|---|
| Appearance | Colorless liquefied gas |
| Odor | Slight, ether-like |
| Boiling Range | -44.3°C to -37.1°C |
| Vapor Pressure | 7,810 mm Hg at 20°C |
| Density | 1.16 g/ml at 20°C |
| Water Solubility | Insoluble |
| Vapor Density | Approximately 3.0 |
| Physical State | Gas at normal temperature and pressure |
R22 Retrofit Note: Before converting an R22 system to R407C, follow the equipment manufacturer’s retrofit instructions. Check the required POE oil, system components, charging method, and operating conditions before starting the conversion.
