GZ Industrial Supplies Nigeria is the distributor of Harp Brand of Refrigerants in Nigeria. Harp Refrigerant Gas 407C is a zero ozone depletion (ODP) hydrofluorocarbon (HFC) refrigerant blend. Harp® 407C is a ternary blend of R32, R125 and R134a (23%/25%/52%). It has been formulated to closely match the properties of HCFC R22. It is widely used in new equipment that would have previously used R22 and can with specific modifications be retrofitted into exiting R22 equipment.

APPLICATION

Harp Refrigerant Gas 407C applications include residential and commercial air conditioning systems, direct expansion fluid chillers and some commercial refrigeration systems. Since Harp® 407C has similar properties to R22, it is possible (with modifications) to use it in existing R22 systems. It should not be used in systems with a flooded evaporator.

PROPERTIES AND PERFORMANCE

Harp Refrigerant Gas 407C is designed to meet the needs of many new and existing air conditioning and refrigeration systems. Harp® 407C is a zeotropic HFC refrigerant blend rated A1 by ASHRAE (lowest levels of toxicity and flammability), having zero ozone depletion potential and a Global Warming Potential of 1774.

CHARGING

Due to the zeotropic nature of Harp® 407C, it should be charged as a liquid to prevent fractionation (changes in refrigerant composition due to vapour charging). In situations where vapour is normally charged into a system, a valve should be installed in the charging line to flash the liquid to vapour while charging.

RETROFITTING

Harp Refrigerant Gas 407C can be used to retrofit existing R22 systems in positive displacement, direct expansion refrigeration, and air conditioning equipment. R407C should not be used in centrifugal chillers or other equipment that uses a flooded evaporator, due to its high temperature glide.

MATERIAL COMPATIBILITY

Whenever retrofitting air-conditioning or refrigeration systems, compatibility of system materials must always be taken into consideration. Items such as elastomers, hoses, and filter-driers respond differently to different refrigerants and oils. For these reasons, before performing any refrigerant retrofit, Harp International recommends contacting the OEM for specific recommendations.

BASIC PROPERTIES

Chemical formula R32: CH2F2 (23% by weight)

R125: CHF2CF3 (25% by weight)

R134a: CH2FCF3 (52% by weight)

Molecular weight 86.2

Boiling point at 1 atm. -43.6°C

Temperature glide at 1 atm. 7.0 K

Critical temperature 86.0°C

Critical pressure 46.3 bar absolute 

Contact us for product availability.