Refrigerant R422D, R-422D, (R22 R-22 R-407C R-417A Substitute), (2) 28 oz. Cans
Refrigerant R422D, R-422D, (R22 R-22 R-407C R-417A Substitute)
(2) 28 oz. Cans
Refrigerant R422D, R-422D, R422
(R22 R-22 R-407C R-417A Substitute)
(2) 28 oz. Disposable Cans
(R22 R-22 R-407C R-417A Substitute)
Each Can is 28 oz.
GENETRON 422D (R-422D)
Honeywell Genetron® Refrigerant R422D offers a non-ozone-depleting HFC alternative to R-22.
R-422D refrigerant is specifically designed to retrofit any refrigeration or A/C system using R22..
- No oil change* or TXV** change in most installations
- Satisfies customers looking for a “drop-in” option for R-22.
- Slightly less capacity and efficiency but lower discharge temperatures then R-22.
- Can be used with AB, MO, POE lubricants.
*System designs vary and the addition of POE may be required to assure proper oil return.
**The mass flow of 422D is higher than that of R-22.
An evaluation of the expansion device is recommended.
ASHRAE # R-422D
Refrigerant Type Blend
Typical Lubricant Mineral Oil
Contains HFC-125 (65.1%), HFC-134a (31.5%), HC-600a (3.4%)
Notes Lower capacity. Can replace HCFC-22 in many cases without having to change compressor lubricant. May be used with alkylbenzene, mineral oil and POE lubricants. If inadequate oil return is observed for AB addition of POE may be needed. Genetron 422D can, in most cases, be used with existing HCFC-22 thermostatic expansion valves.Larger valves may be needed in cases where the R-22 valve is near its maximum capacity.Lower discharge temperature than HCFC-22, which may extend compressor longevity.
In retrofitting an existing air conditioning system, material compatibility and the condition of the existing seals and gaskets must be taken into account. It is recommended to change any O-rings, seals and other elastomers used in the system, (as expected in any retrofit to HFC). In most air conditioning and heat pump systems this only applies to the Schrader valve seal and cap seal material.
1. Record Baseline Data
Before making any hardware changes, compare current system operating data with normal operating data. Correct any deficiencies and record final data as a performance baseline. Data should include temperature and pressure measurements throughout the system including the evaporator, compressor suction and
discharge, condenser and expansion device. These measurements will be useful when adjusting the system with an alternative Genetron refrigerant.
2. Isolate R-22 Refrigerant Charge
The HCFC refrigerant charge should be removed from the system using an approved recovery machine capable of meeting or exceeding the required levels of evacuation.
The charge must be collected in a recovery cylinder.
DO NOT VENT THE REFRIGERANT
Knowing the recommended R-22 refrigerant charge size for the system is helpful. If it is not known, weigh the entire amount of refrigerant removed. This amount can
be used as a guide for the initial quantity of alternative Genetron® Refrigerant to be charged to the system.
3. Choose Compressor Lubricant
In most instances, the lubricant in use with R-22 is a mineral oil or alkyl benzene. Genetron 422D retrofit of a system with short connecting lines typically will not require an oil change or modification. Honeywell recommends using a miscible lubricant approved by the compressor manufacturer. In this case, POE oil is recommended for R-422D. Differences among lubricants make it difficult to assume that they are interchangeable. Check with the compressor manufacturer for the correct viscosity grade and brand for the compressor in the system being retrofitted. If the lubricant is contaminated or an acid test indicates high levels of acidity, then a lubricant change is warranted. Field trials have indicated that adequate oil return can occur in HFC retrofit systems when 15% -20% of the lubricant operating charge is synthetic oil. Systems with
receivers or low-side accumulators (heat pumps) will require a higher ratio of POE to mineral oil.
4. Evaluate the Expansion Device
Honeywell recommends consulting with the equipment manufacturer before retrofitting. Most HCFC-22 A/C systems with either expansion valves or capillary tubes
will operate satisfactorily with Genetron 422D.
5. Replace the Filter Drier
Following system maintenance, a recommended service practice is to replace the filter drier. There are two types of filter driers commonly used in refrigeration equipment: loose-fill and solid-core. Check with your wholesaler to make sure the replacement filter drier is compatible with the Genetron® refrigerant
being used. When changing to an HFC-miscible lubricant, particularly to a more polar lubricant such as polyol ester, it may be beneficial to add a suction line filter
6. Reconnect the System and Evacuate
Use normal service practices to reconnect and evacuate the system. To remove air and other non-condensables, Honeywell recommends evacuating the system to a full
vacuum of 1,000 microns or less from both sides of the system. However, attempting to evacuate a system with the pump connected only to the low-side of the system
will not adequately remove moisture and non-condensables such as air. Use a good electronic gauge to measure the vacuum. An accurate reading cannot be made with a refrigeration gauge.
7. Check the System for Leaks
Check the system for leaks using normal service practices
8. Charge System with Genetron HFC Refrigerant
When replacing HCFC-22 with Genetron® 422D, use the same charging procedures that you would use or the refrigerant being replaced. When working with Genetron 422D it is important to remember that these are blend refrigerants. It is essential that blend refrigerants be charged by removing only liquid from the cylinder. A throttling valve should be used to control the flow of refrigerant to the suction side to ensure that the liquid is converted to vapor prior to entering the system.
NOTE: To prevent compressor damage, do not charge liquid into the suction line of the unit. Never vapor charge the system with vapor from a 400-series refrigerant cylinder. Vapor-charging may result in the wrong refrigerant composition and could damage the system. Systems being charged with Genetron 422D require a slightly smaller charge size than HCFC-22. For expansion valves or optimized capillary tube systems, the typical charge size relative to the HCFC-22 being replaced appears below. As part of general procedure, Honeywell recommends initially charging the system with 85 percent by weight of the original system charge and then adding refrigerant as necessary in 5% increments to obtain equal baseline performance.
9. Check System Operation
Start the system and allow conditions to stabilize. If the system is undercharged, add refrigerant in increments of 5 percent by weight of the original charge. Continue until desired operating conditions are achieved. It may be necessary to reset the pressure cutouts to compensate for the different pressures of the replacement refrigerant. This procedure should be done carefully to avoid exceeding the recommended operating limits of the compressor and other system components. The use of an unoptimized capillary tube will make the system more sensitive to charge and/or operating conditions. As a result, system performance will change more quickly if the system is overcharged (or undercharged). To avoid overcharging, it is best to charge the system by first measuring the operating conditions (including discharge and suction pressures, suction line temperature, compressor amps, superheat) instead of using the liquid line sight glass as a guide.
Relative Charge Size Genetron Refrigerant HCFC-22 100% / 422D 4% - 5% less For blend refrigerants, pressure-temperature data will
include bubble pressure and dew pressure data. To determine superheat, use the dew pressure column. To determine subcooling, use the bubble pressure column. To find average evaporating or condensing temperature, find the measured pressure in both the bubble and dew columns and take the average of the two corresponding temperatures.