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0 4' RECEIVED <br />MAY 18 2015 <br />104. Arupture disc on a low-pressure recovery vessel relieves at what psig? ENVIRONMENTAL <br />uFelTuncpngTAAF T <br />105. An average 350 ton R-11 chiller at 0 psig still contains how many lbs. of vapor after all the liquid has been <br />removed? <br />106. What must be circulated through the tubes when evacuating refrigerant in order to prevent freezing the <br />water in low pressure chillers? <br />107. The ASHRAE Guideline 3-1996 states that if the pressure in a system rises from 1 mm Hg to a level above <br />2.5 mm Hg during vacuum testing, what should happen to the system? <br />108. With low pressure chillers, the initial charging of the refrigerant is in what phase? <br />109. What are required levels of evacuation for low pressure appliances? <br />110. What can cause trapped water to freeze? <br />111. Because chillers using refrigerants such as CFC -11 and HCFC -123 operate below atmospheric pressure, <br />they require what? <br />112. In order to protect the system from over -pressurization, low-pressure chillers typically use what mounted <br />on the evaporator housing? <br />113. The typical design burst pressure for a rupture disc is what psig? <br />114. ASHRAE standard 15 requires a refrigerant monitor that will sound an alarm and automatically start a <br />ventilation in equipment rooms before the refrigerant concentration reaches what? <br />115. CFC -12, CFC -11, and HFC -134a are code grouped as what? <br />116. R-123 is code grouped as what? <br />117. All refrigeration systems must be protected by what? <br />Providing outstanding, nationwide refrigerant recovery for the HVAC/Refrigeration/Demolition/Marine industries. <br />Local On -Site Service — An Independently Owned & Operated Franchise Company <br />