MD HVAC MASTERS COMPREHENSIVE TEST
2026 FULL ANSWERS REVIEW GRADED A+
◉ Any appliance in which the products of combustion at the point of
entrance to the flue under normal operating conditions have a
temperature of 1000 degrees is a ____________ appliance. Answer: Low
◉ A connector to a chimney flue shall be at least __________ the lowest
portion of the interior of the flue. Answer: 12" above
◉ The temperature for a fire damper actuating device shall not be
less than ___________ degrees. Answer: 160
◉ Horizontal pipes in a hydronic system should ____________. Answer:
Be sloped toward boiler
◉ A boiler shall have an unobstructed passageway of ___________
around all sides. Answer: 18"
◉ What is the color code for R-410A? Answer: Rose
◉ A one (1) ton refrigeration system has the equivalent of _________
BTU's. Answer: 12,000
, ◉ A safety belt lanyard shall be a minimum of ½" nylon, or
equivalent, with a maximum length to provide for a fall of no greater
than __________ feet? Answer: 6
◉ The purpose of a suction accumulator is _______________. Answer: It
catches and holds liquid refrigerant that has passed through the
evaporator coil so it will not enter the compressor
◉ Minimum size access opening for equipment installed in an
underfloor area is ____________. Answer: 22 x 30
◉ External equalizing line should be installed downstream of the
thermostatic expansion valve at? Answer: Diaphragm
◉ A feed water line that delivers makeup water to a hydronic boiler
is required to have which two kinds of valves? Answer: A hand valve
and a pressure reducing valve
◉ Materials used in plenums shall have a flame rating of _____________.
Answer: 25
◉ Flexible air duct connections may pass through which of the
following?
2026 FULL ANSWERS REVIEW GRADED A+
◉ Any appliance in which the products of combustion at the point of
entrance to the flue under normal operating conditions have a
temperature of 1000 degrees is a ____________ appliance. Answer: Low
◉ A connector to a chimney flue shall be at least __________ the lowest
portion of the interior of the flue. Answer: 12" above
◉ The temperature for a fire damper actuating device shall not be
less than ___________ degrees. Answer: 160
◉ Horizontal pipes in a hydronic system should ____________. Answer:
Be sloped toward boiler
◉ A boiler shall have an unobstructed passageway of ___________
around all sides. Answer: 18"
◉ What is the color code for R-410A? Answer: Rose
◉ A one (1) ton refrigeration system has the equivalent of _________
BTU's. Answer: 12,000
, ◉ A safety belt lanyard shall be a minimum of ½" nylon, or
equivalent, with a maximum length to provide for a fall of no greater
than __________ feet? Answer: 6
◉ The purpose of a suction accumulator is _______________. Answer: It
catches and holds liquid refrigerant that has passed through the
evaporator coil so it will not enter the compressor
◉ Minimum size access opening for equipment installed in an
underfloor area is ____________. Answer: 22 x 30
◉ External equalizing line should be installed downstream of the
thermostatic expansion valve at? Answer: Diaphragm
◉ A feed water line that delivers makeup water to a hydronic boiler
is required to have which two kinds of valves? Answer: A hand valve
and a pressure reducing valve
◉ Materials used in plenums shall have a flame rating of _____________.
Answer: 25
◉ Flexible air duct connections may pass through which of the
following?
