Here’s an important message for units: Refrigeration and maintenance services on Environmental Control Unit (ECU) systems that contain a refrigerant known as R22 are no longer authorized to be performed in OCONUS locations in Europe. This restriction includes service procedures like full refrigerant charges and/or “topping off.”
Units can continue to operate ECU systems using R22 until refrigeration services are required. But once any services are due, R22 must not be used and/or serviced.
Personnel stationed OCONUS who violated international restrictions by continuing to service R22, which has ozone-depleting hydrochlorofluorocarbons, have been penalized and fined by host nations.
OCONUS R22 use may result in host nation fines
As a solution, CECOM’s Integrated Logistics Support Center (ILSC) has tested and approved the use of MO99, also known as R438A, as a safe and suitable “drop-in” replacement refrigerant for R22 in legacy ECU systems.
R438A refrigerant is only authorized for use in the following ECU systems:
- Be aware of any ECU systems that have already been charged (retrofitted) with R438A refrigerant with identification plates stating that the newer refrigerant was applied. Note: This is a critical step to ensure the two refrigerants aren’t mixed, which can cause a chemical/pressure imbalance, making ECU systems NMC.
Apply identification plates to retrofitted ECU systems
- Units performing retrofits should contact the CECOM representatives listed below or LARs to acquire CAUTION identification plates to be attached to retrofitted ECU systems.
- R438A retrofits are to be performed on an as-needed basis (attrition), unless units are informed otherwise or unit resources become available.
- Units are asked to retrofit ECU systems to R438A prior to deployments in theater.
- If R438A is not available through DLA and service is necessary, local purchase is authorized through LAR-approved sources.
Take note of these R438A refrigerant charging pressures:
- If you have questions on ECU systems support, contact the following CECOM ILSC POCs:
Sydney Mapp at:
Mike Rankosky at: