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HVAC Variable Refrigerant Flow Systems


Quiz Questions

1.The total refrigerant charge in the refrigerant loop must be within the limits prescribed by Standard 15-2001 for the smallest zone served by the system to ensure the safety of occupants if the entire charge is released.
True
False
2. Single system’s refrigerant loop consists of
condensing unit
multiple fan coil units
Both a & b
None of the above
3.Headers and splitters are specifically designed for the product and require flaring or changing wall thicknesses.
True
False
4.VRF systems were introduced by ___________companies with limited presence in the U.S., particularly in the large commercial HVAC market.
Chinese
Australia
U.S.
Japanese
5.Each compressor has its own___________, which is optimized for the VRF system.
oil retrieval
oil separator
oil mixer
None of the above
6.VRF systems are not suitable for all ______________applications.
residential and commercial
residential building
commercial building
None of the above
7.Ventilation systems used in conjunction with VRF systems are engineered separately on a(n) _____________basis.
case-by-case
all together
Both a & b
None of the above
8.Using gas or oil heating with a VRF requires a separate furnace or boiler, which is more ___________than a gas-fired rooftop system or a chiller/boiler system.
reasonable
cheaper
expensive
None of the above
9.The following figure indicates
HVAC Variable Refrigerant Flow Systems

Heat recovery VRF system
Heat releasing VRF system
Cooling recovery VRF system
Coolant releasing VRF system
10.Placing an electric meter on one or a few condensing units is relatively simple, accurate and inexpensive, whereas metering chilled water or refrigerant is more complex.
True
False