Buy RS-45 Refrigerant (R434A) | Flooded & DX System Refrigerant | 24 lb — Refrigerant Inc

RS-45 Refrigerant (R434A) — For Flooded, Recirculating & DX Systems

RS-45, officially designated R434A by ASHRAE, is a refrigerant blend developed by Comstar International for use in flooded evaporator, recirculating, and direct expansion (DX) refrigeration systems. It is particularly suited for low-temperature commercial and industrial refrigeration applications where systems were originally designed for R22 or R502. Refrigerant Inc stocks genuine RS-45 in 24 lb cylinders with free shipping to all 48 continental states.

What Systems Use RS-45 (R434A)?

RS-45 is designed for a specific class of refrigeration systems that differ from standard residential and light commercial AC equipment:

• Flooded evaporator systems — Large commercial and industrial refrigeration systems where liquid refrigerant floods the evaporator for maximum heat transfer efficiency
• Recirculating systems — Industrial refrigeration systems that use pumped liquid refrigerant recirculation rather than direct expansion
• Direct expansion (DX) systems — Commercial refrigeration equipment including walk-in coolers, freezers, and food processing systems originally charged with R22
• Low-temperature industrial refrigeration — Cold storage and process cooling systems requiring temperatures well below 0°F
• Older commercial equipment — Systems originally designed for R22 or R502 that are being serviced or retrofitted

Note: RS-45 is a specialty refrigerant intended for these specific system types. It is not a general-purpose R22 replacement for standard residential AC systems — for those applications, see RS-44b or R438A (MO99).

RS-45 Key Properties

• Designed for low and ultra-low temperature applications
• Compatible with flooded, recirculating, and DX system designs
• Non-flammable, A1 safety classification
• Compatible with POE lubricants used in commercial refrigeration equipment
• Developed and manufactured by Comstar International

Why Buy RS-45 From Refrigerant Inc

• Genuine Comstar Product — Factory-sealed RS-45 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-45 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-45 the same as R434A?
Yes. R434A is the official ASHRAE designation. RS-45 is Comstar's brand name for R434A. They are the same refrigerant.

What is a flooded evaporator system?
In a flooded evaporator system, liquid refrigerant completely fills the evaporator tubes or shell, maximizing the surface area available for heat transfer. These systems are common in large industrial and commercial refrigeration plants, chillers, and cold storage facilities. They differ from DX (direct expansion) systems where refrigerant is metered in and fully evaporates before leaving the evaporator.

Can RS-45 be used in standard residential AC systems?
RS-45 is not designed for standard residential split system air conditioners. For residential R22 retrofits, use RS-44b (R453A) or R438A (MO99). RS-45 is intended for flooded, recirculating, and commercial DX systems.

What oil does RS-45 require?
RS-45 requires POE (polyolester) lubricant. Verify the existing oil type in the system before retrofitting. If mineral oil is present, an oil change is required.

Not sure if RS-45 is right for your system?
Call us at 888-593-7366. Given RS-45's specialty application, it's worth a quick conversation to confirm it's the right refrigerant before ordering.