EPA 608

When moisture exists in an operating system, what is most likely to occur? ans Acid will form. What factor(s) affects the speed of evacuation? ans 1) The size of the equipment being evacuated. 2)The ambient temperature. 3) The amount of moisture in the system A system is considered dehydrated when? ans The vacuum indicator shows you have reached & held the required finished vacuum. The over-evacuation of a system: ans Does not occur. The size (capacity) ...

When a new system has been assembled, the first thing to do is? ans Pressurize the system with an inert gas & leak check. After installation of a field-piped R-410A split heat pulp, the unit should first be? ans Pressurized with nitrogen then leak checked. The EPA regulations require that any appliances containing more than 50 pounds of refrigerant (except for commercial & industrial process refrigeration) must be repaired when the leak rate exceeds _________ of the charge per ...

Heat pumps that have been retrofitted from R22 to R407C should be leak checked with: ans pressurized nitrogen When a new system has been assembled, the first thing to do is: ans pressurize the system with inert gas and leak check EPA regulations require that leaking commercial or industrial process refrigeration equipment must be repaired when the leak rate exceeds______ of the charge per year. ans 35% Prior to replacing the condenser coil in a high pressure system, th...

Refrigeration technicians who violate the Clean Air Act can: - ans Lose their EPA certification, be fined, be required to appear in Federal court. After 1995, any supplies of CFC refrigerants to service existing units in the USA can only come from: - ans recovery and recycling. Refrigerant that is recovered can be returned to: - ans the same system or other systems owned by the same person without restriction. Refrigerant can not be called "reclaimed" unless it: - . ...

Recovery equipemnt used for the service or repair of small appliances must be certified by an EPA approved lab if the recovery equipment was made after ans November 15, 1993 Recovery devices made before 11-15-93 and are used for recovery of refrigerant from small appliances must be capable of: ans recovering 80% of the refrigerant whether or not the compressor is operating or achieving a 4 inch vacuum under conditions of ARI 740-1993 EPA's definition of a small appliance inclu...

Are there drop-in replacements for R-12 systems? Why or why not? ans No because the new refrigerants are incompatible with the oils and lubricants used in R-12 systems. What type of oil is used in R-134a and what oils will it mix with? ans Ester based oils and they do not mix with other oils What type of lubricant is used with HCFCs? ans Alkylbenzene lubricant What is difference b/w ternary blend a azeotropic blend? ans Ternary blends are three-part mixtures wher...

What are the typical uses of the center port of gauge set? ans Used during evacuation, charging and recovery procedures. What color are the gauges on a manifold gauge set? ans Low pressure is blue, High pressure is red. What are the typical ranges of pressure measurements used on the gauges of a manifold gauge set? ans High side is 0 to 500 PSIG; Low side is 0 to 350 PSIG and 0 to 30 in. Hg below atmospheric pressure. Is the refrigerant leaving a condenser at a high or...

What type of equipment can be worked on with Type III certification? ans low pressure The most efficient method of leak checking a charged low-pressure refrigeration unit is to ans pressurize the system by the use of controlled hot water or heater blankets When pressurizing a system, do not exceed ans 10 psig After reaching the required vacuum on an appliance when servicing, moisture is indicated by ans multiple rises in pressure over a period of time with increa...

What does ozone in the stratosphere above the earth consist of? ans Molecules containing 3 oxygen atoms Which of the following refrigerants has the lowest global warming potential? ans R-600a Which of the following gases is used as the baseline measurement for global warming potential? ans Carbon Dioxide Which type of refrigerant typically has the lowest global warming potential? ans HFO's What is the state of the refrigerant entering the compressor of a refr...