Buy RS-51 Refrigerant (R470B) | R404A, R22 & R507 Replacement | 24 lb — Refrigerant Inc

RS-51 Refrigerant (R470B) — Versatile Replacement for R404A, R22 & R507

RS-51, officially designated R470B by ASHRAE, is a refrigerant blend developed by Comstar International designed to replace R404A, R22, and R507 across a range of commercial refrigeration applications. Its broad compatibility makes it a versatile option for contractors servicing mixed equipment fleets or older commercial systems that may have used any of these three refrigerants. Refrigerant Inc stocks genuine RS-51 in 24 lb cylinders with free shipping to all 48 continental states.

What Systems Use RS-51 (R470B)?

RS-51's multi-refrigerant compatibility makes it applicable across a wide range of commercial refrigeration equipment:

• Commercial refrigeration systems originally using R404A — Supermarket cases, walk-in coolers and freezers, commercial ice machines
• Systems originally using R507 — Low-temperature frozen food and cold storage equipment
• Older commercial systems using R22 — Light commercial refrigeration equipment and older packaged systems charged with R22
• Mixed equipment environments — Facilities running older and newer equipment where a single retrofit refrigerant covering multiple legacy refrigerants simplifies inventory

RS-51 Retrofit Considerations

• Fully recover existing refrigerant first — Recover all R404A, R507, or R22 before introducing RS-51. Do not mix refrigerants.
• POE oil required — RS-51 requires POE lubricant. Verify the existing oil type before converting. R22 systems running mineral oil will require an oil change.
• Check charge weight — Refer to Comstar's RS-51 retrofit documentation for charge weight recommendations by system type. Charge weight may differ from the original refrigerant specification.
• Verify operating pressures post-charge — Use RS-51 PT charts to confirm suction and discharge pressures are within expected ranges after charging.
• Label the system — Update the equipment label with the new refrigerant type, charge weight, and conversion date.

RS-51 vs. Other Comstar RS Refrigerants

• RS-51 (R470B) — Broadest compatibility, replaces R404A, R22, and R507; ideal for mixed equipment environments
• RS-44b (R453A) — Closest match to R22 specifically; best for residential and light commercial AC retrofits
• RS-50 (R442A) — Focused R404A/R507 replacement for low-temperature commercial refrigeration
• RS-52 — R502 replacement for older commercial low-temperature systems

Why Buy RS-51 From Refrigerant Inc

• Genuine Comstar Product — Factory-sealed RS-51 by Comstar International.
• Free Shipping to All 48 States — No freight fees added at checkout.
• Same or Next-Day Processing — Orders placed before 2PM EST ship the same day.
• Contractor & Wholesale Pricing — Volume accounts available. Call 888-593-7366.

Shipping Information

RS-51 ships via ground freight to all 48 continental states. Alaska and Hawaii excluded. Most orders ship within 1 business day. Transit time is typically 2–5 business days depending on location.

Frequently Asked Questions

Is RS-51 the same as R470B?
Yes. R470B is the official ASHRAE designation. RS-51 is Comstar's brand name for R470B. They are the same refrigerant.

Can RS-51 really replace R22, R404A, and R507?
RS-51 is formulated to be compatible across these three refrigerant applications. However, always verify operating pressures and performance against RS-51 PT charts after retrofitting, and follow Comstar's application-specific retrofit guidelines for each system type.

Which is better for an R22 AC retrofit — RS-51 or RS-44b?
For standard residential and light commercial AC systems, RS-44b is the better choice — it's specifically engineered to match R22's pressure-temperature profile in AC applications. RS-51's strength is its versatility across R404A, R22, and R507 in commercial refrigeration environments.