Sub-Zero units have used different refrigerants over the years. Very old units used R-12, many units use R-134a, and some newer models use R-600a (isobutane). The refrigerant type and charge amount are printed on the rating plate. Any work that opens the refrigerant circuit must be done by an EPA Section 608 certified technician, who must recover the refrigerant rather than vent it.
Refrigerant Types
| Refrigerant | Found in | Notes |
|---|---|---|
| R-12 | Very old units | Ozone-depleting; production phased out. Serviced with recovery and approved procedures. |
| R-134a | Many Sub-Zero models | Non-flammable HFC. |
| R-600a (isobutane) | Some newer models | Flammable hydrocarbon in very small charges; requires specific tools and procedures. |
EPA Section 608
Section 608 of the Clean Air Act requires technicians who maintain, service or repair equipment that could release refrigerant to be certified, and it prohibits knowingly venting refrigerant. Our technicians are EPA 608 certified.
Why Charge Accuracy Matters
Domestic refrigerators are critically charged. The correct amount is listed on the rating plate and must be weighed in. See evacuation & recharge.
Need a Sub-Zero Specialist?
$75 service call, credited toward your repair · 1-year parts · 180-day labor warranty · EPA 608 certified · Mon–Fri 8am–7pm · Sat–Sun 8am–4pm