1. What is the Phone Number for the EPA Ozone Protection Hotline?
The EPA Ozone Protection Hotline toll-free number is (800) 296-1996
2. What type of Certification do I need to purchase refrigerants?
If you get a 608 certification (Type I, Type II, Type II, or Universal), you can buy any
refrigerant sold in an HVAC/R store in containers of 20 pounds or more. If you get 609 certification
you can buy any refrigerant sold in an automotive supply house in any size container, however these
stores typically only sell R-12, R-134a and replacement blends for R-12
3. Can HFC refrigerant be released into the air, or does it have to captured?
Also, does the technician handling the refrigerant have to be licensed? You must recover
the refrigerant, and the technician has to be certified by EPA.
4. What type of A/C systems am I certified to work on with each type of certification?
608 HVAC Type I certification certifies you to work on unitary small appliances containing
five pounds or less of refrigerant. 608 HVAC Type II certification certifies you to work on high-
pressure and very high-pressure appliance which includes split systems and all other non-automotive
systems not covered under the category of unitary small appliance or low-pressure appliance. 608 HVAC
Type III certification certifies you to work on low-pressure appliances, such as chillers.
5. How often must the EPA Section 608 certification be renewed?
Currently the EPA certification has no expiration date.
6. What are the acceptable procedures for recovery of refrigerants contained in oil?
1) Evacuate (or pressurize) the refrigeration appliance, or isolated portion, to a pressure
no greater than 5 psig and then remove the oil, or 2) Drain the oil into a system receiver to be
evacuated (or pressurized) to a pressure no greater than 5 psig.
Sample Test Questions
Recovery equipment used during maintenance, service or repair of small appliances must be
certified by an EPA-approved laboratory if manufactured after: A) July 1, 1992
B) July 1, 1993 C) May 13, 1993 D) November 15, 1993
The correct answer is D. Recovery equipment manufactured after November 15, 1993 must be certified by
an EPA laboratory, be equipped with low-loss fittings and must meet the stringent vacuum standards. System-
dependent recovery equipment cannot be used on appliances containing more than 15 lbs. of refrigerant.
Leak testing a low pressure refrigeration system with nitrogen in excess of 10 psig could
cause which of the following to fail? A) condenser tubes B) purge unit shells
C) evaporator tubes D) rupture disc
The correct answer is D. The most efficient method of leak checking a charged low-pressure refrigeration
unit is to increase the pressure in the system by the use of controlled hot water or heater blankets. If using hot
water or heater blankets is not possible, use nitrogen to increase the pressure. Do not exceed 10 psig when
pressurizing with nitrogen as this can cause the rupture disc to fail. When leak testing a water box, be certain
the water has been removed, then place the leak detector probe in through the drain valve. To leak test a tube,
use a hydrostatic tube test kit.
Persons recovering refrigerant during maintenance, service or repair of small appliances must be certified as:
A) a Type II Technician B) a Type III Technician
C) a Type I Technician or Universal Technician D) all of the above
The correct answer is C. Technicians that handle refrigerant during service, maintenance or repair of small appliances
must have a Type I of Universal certification. The sales of CFCs and HCFCs are restricted to certified technicians. If
the EPA changes regulations after the technician is certified, it is the responsibility of the technician to comply
with any future changes in the law.
What is meant by the term “high efficiency purge unit?”
A) Those purge units which discharge a high percentage of refrigerant with the air which they remove
B) Those purge units which discharge a low percentage of refrigerant with the air which they remove
C) Those purge units which draw very little electrical power
D) None of the above
The correct answer is B. A high efficiency purge system will expel very little refrigerant along with the air,
while an inefficient purge unit will continue to leak refrigerants. In order to reduce refrigerant loss through
the purge unit, the technician should leak test and repair the chiller.