How should refrigerant be recovered from a chiller?
A) Always begin the refrigerant recovery using vapor recovery methods
B) The chiller should be operated to build pressures prior to starting recovery
C) Always begin the refrigerant recovery using liquid recovery methods
D) Refrigerant should be pushed out by pressurizing the chiller with 50 psig of nitrogen
C
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All birds in a flock infected with END must be destroyed to prevent the spread of the disease.
Answer the following statement true (T) or false (F)
A pressure-temperature defrost control is activated by the ____.
A. difference of the pressure in the fan compartment and the temperature of the coil B. difference in pressure between the outdoor pressure and the fan discharge pressure C. difference in the pressure of the air through the outdoor coil D. difference in pressure of the refrigerant in the condenser and the pressure in the coil
Technician A says that the tinnerman nuts used to hold the brake drum on should be reinstalled when the drum is replaced. Technician B says that a drum should be removed inside a sealed vacuum enclosure or washed with water or solvent to prevent possible asbestos dust from being released into the air. Which technician is correct?
A) Technician A only B) Technician B only C) Both Technicians A and B D) Neither Technician A nor B