R-407H PT Chart and Refrigerant Profile

Where you will find R-407H

R-407H is a Daikin blend of R-32, R-125 and R-134a, sold in the US as Creard R-407H; EPA’s SNAP rules call it D407. Daikin America markets it as a replacement for R-404A and as an R-22 retrofit. Its promo sheet lists walk-in coolers and freezers, supermarket systems and display cases, transport refrigeration, remote condensing units and chillers. BITZER also lists it as a substitute for R-507A, R-407A and R-407F.

Expect it in converted R-404A walk-ins and racks, truck and trailer units, and some R-22 refrigeration conversions. Read the retrofit label; the nameplate keeps the original refrigerant. Daikin’s data sheet lists 25 lb disposable and 100 lb returnable containers. The legacy label color under AHRI Guideline N-2017 is light purple (wisteria, PMS 2573), not to be confused with R-502’s light purple (lavender).

It is a sibling of R-407A, R-407C and R-407F: same three components, different proportions. R-407H has the most R-32 of the four (32.5%) and the least R-125 (15%), which is how it gets a lower GWP.

Charging R-407H

Charge from the liquid phase only, and keep liquid out of the compressor, per Daikin’s R-22 retrofit guidelines.

The glide is large: 11.1°F at a 40°F dew point and 9.1°F at a 100°F bubble point. At 40°F this chart gives 66.4 psig dew and 84.2 psig bubble. Against R-404A (85.4 psig dew at 40°F), suction pressure at the same evaporator dew point is much lower, while condensing pressure is almost the same: 235.2 psig bubble at 100°F versus 236.8 psig. Do not set an R-404A system’s controls from habit after conversion.

• Superheat: read suction pressure against the dew column. Use the superheat calculator.
• Subcooling: read liquid-line pressure against the bubble column. Use the subcooling calculator.

Daikin’s charge guidance when replacing R-22:

• Optimum charge is +8% to -2% of the R-22 charge.
• With a receiver, fill to 90% of the nameplate liquid volume, then adjust.
• Without a receiver, fill to 95% of the R-22 removed, then add small liquid increments while adjusting.

For low-temperature R-22 retrofits, Daikin allows R-407H only with liquid injection or another way to control discharge temperature. The temperature glide calculator shows the gap at any pressure.

Oil and compatibility

Daikin says R-407H is compatible with POE and PVE and recommends POE because it is widely available. It is not compatible with mineral oil, so all mineral oil must be removed when converting an R-22 system. BITZER lists POE and PVE, with AB only “with limitations”. Copeland AE 93-11 approves POE-32 for R-407H in Discus semi-hermetics and ZB/ZF scrolls on refrigerated rack retrofits.

An R-404A or R-507A system already runs POE, so the oil normally stays. Replace the filter-drier, evacuate to the OEM target (evacuation guide) and keep POE containers sealed against moisture. See the refrigerant oil guide.

Safety, handling and recovery

R-407H is A1: lower toxicity, no flame propagation. It is a Section 608 high-pressure refrigerant, with a computed liquid saturation pressure at 104°F of 263.9 psia (249.2 psig, bubble). Type II or Universal certification covers it, and sales have been limited to certified technicians since Jan 1 2018.

Recover appliances made after Nov 15 1993 to 0 in Hg under 200 lb of charge and 10 in Hg at 200 lb or more (refrigerant recovery). From Jan 1 2026, appliances holding 15 lb or more of HFC fall under the HFC leak repair rule (leak repair rules). New cylinders since Jan 1 2020 are light green-gray (RAL 7044).

Status and replacements

EPA SNAP lists R-407H as acceptable, retrofit and new, in:

• remote condensing units, July 21 2017 (82 FR 33809)
• supermarket systems, refrigerated food processing and dispensing, and truck and trailer transport refrigeration, Nov 25 2019 (84 FR 64765)

Its AR4 GWP of about 1,495 is less than half of R-404A’s 3,922, but it is above the interim 1,400 limits in 40 CFR 84.54 for new remote condensing units (from July 27 2026) and new supermarket systems (from Jan 1 2027). 84.54 also names it for new food processing and dispensing equipment (Jan 1 2027) and UL 621 ice cream makers (Jan 1 2028). Retrofitting and servicing existing systems remain legal. From Jan 1 2029, supermarket systems and refrigerated transport must be serviced with reclaimed HFC.

No source names a successor. Compare it with other R-404A options in R-404A replacement and with R-22 options in R-22 replacement.

Common questions

R-407H vs R-407C: what is the difference?

Both blend R-32, R-125 and R-134a, but R-407H carries 32.5/15/52.5 and R-407C 23/25/52. R-407H runs higher pressures (66.4 against 63.2 psig dew at 40°F) and has a lower GWP (1,495 against 1,774). R-407C is the AC refrigerant; R-407H is aimed at commercial refrigeration.

Is R-407H a drop-in for R-404A?

Daikin markets it as an R-404A replacement. It keeps POE oil, but the 11°F glide and lower suction pressure mean you should expect to adjust the charge, superheat and pressure controls. Treat it as a retrofit: recover the R-404A first, never top off with it.