15 psig
A rupture disk breaks and releases pressure after exceeding a certain level. Pressure should not exceed 10 psig. Anything above 10 psig will result in a break and release of pressure.
Low-pressure
Technicians maintaining, servicing, repairing or disposing of lowpressure appliances must be certified as a Type III Technician or a Universal Technician. (Page 24 ESCO EPA 9TH V2 Edition Prep Manual)
Heat
A heat source like steam is used to regenerate the absorption solution.
ASHRAE-15
ASHRAE standard 15 requires a refrigerant monitor that will sound an alarm and automatically start a ventilation system in equipment rooms before the refrigerant concentration reaches the TLVTWA, (threshold limit valuetime weighted average). (Page 27 ESCO EPA 9TH V2 Edition Prep Manual)
DOT
The Department of Transportation (DOT) must approve all recovery cylinders.
Water from freezing.
Water must be circulated through the tubes when evacuating refrigerant in order to prevent freezing the water. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
Reciprocating
Open-drive compressors are typically reciprocating compressors. The motor is completely outside the body.
must have a Type II certification.
R-22 is a high-pressure refrigerant therefore type II certification is needed. R-11 and R-123 are low-pressure refrigerants. (Page 20 ESCO EPA 9TH V2 Edition Prep Manual)
60,000
One refrigeration ton is equal to 12,000 BTUs per hour.
130 degrees F.
A temperature of 130° F should be attained when removing oil from a lowpressure system. Less refrigerant is contained in the oil at this higher temperature. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
.25 oz
Electronic detectors are very sensitive and can detect leaks in the .25 oz per year range.
25 mm of Hg absolute.
Recovery or recycling equipment manufactured or imported before or after Nov. 15, 1993, must be able to achieve a recovery level of 25mm Hg Absolute. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
30 Days
Leaks must be repaired within 30 days of finding the leak.
36 degrees
Before charging with liquid, a refrigeration system requires a vapor pressure above a saturation temperature of 36° F. (Page 26 ESCO EPA 9TH V2 Edition Prep Manual)
35%
35% is the threshold. For equipment that is not commercial or industrial, the threshold is 15%.
Start with liquid removal and then switch over to vapor recovery.
Refrigerant recovery from a system using R11 or R123 starts with liquid removal and is followed by vapor recovery. (Page 25 ESCO EPA 9TH V2 Edition Prep Manual)
