4.2 Placing Vapor Distribution Systems &
Appliances into Operation
__ are used on furnaces, space heaters, or other gas appliances to control the "ON"
and "OFF" cycles of a fan used to distribute heated air. - correct answer-Fan-control
switches
___ air pressure occurs in a room or structure that cannot supply a sufficient amount
of air to meet appliance combustion requirements. - correct answer-Negative
___ appliances generate higher amounts of the flue gases and must be vented to the
outside. Examples of this type of appliance include: central heating systems, water
heaters, and some space heaters. - correct answer-Vented
___ attempt to convert a dedicated natural gas appliance to propane gas. - correct
answer-Never
____ fuel gas appliances are designed to operate only on natural gas or propane,
and no attempt should be made to convert then to a different fuel gas. - correct
answer-Dedicated
"Flow" and "Lock-up tests" are typically performed on vapor distribution systems
during start up to determine if the piping system and regulator are sized correctly for
the BTU load. - correct answer-
,a __ measures the amount of delivered pressure to an appliance with no demand to
ensure that the regulator will shut off the flow of propane when the appliances are
not in use. - correct answer-Lock-up test
A leak check looks for propane leaks by applying pressure to what part of the piping
system? - correct answer-The entire gas piping system
A leak check should be performed under the following conditions: - correct
answer-Immediately after the gas is turned on into a new or modified piping, after an
interruption of service, when a vapor meter has been replaced.
A test measures the propane pressure downstream of the regulator and at the
appliance to determine if the regulator can supply the amount of gas the system
demands. - correct answer-Flow Test
after an appliance is connected to a vapor distribution system, you should conduct a
flow test to measure the gas pressure at the appliance under half load to determine if
the regulator, or regulators, and piping system can supply the amount of gas the
appliance demands. - correct answer-False
After valedatingtheventing of a vapor distribution system and whether it supports
combustion air, you must perform a _____. - correct answer-Leak check
Air or inner gas must be removed from the piping of a propane system after placing
gas points is in the vapor distribution system in the service, true or false? - correct
answer-True
, All exterior distribution lines must be purged from the container to the outlet of the
____ prior to beginning the system purge. - correct answer-second-stage regulator
All system checks and tests performed at any time and by any employee should be
documented showing the: - correct answer-date and time the test or check was
performed
Pressure data and duration
Signature or name of the employee performing the test
Signature or name of the customer if available
An appliance with a natural draft vent must be structured so that gas can flow
downward and out of the bottom of the appliance? True or False - correct
answer-False
An appliance without a 100% safety shut off valve has a safety device to
automatically stop gas from passing to the combustion chamber. True or False -
correct answer-False
Appliance controls vary but most fit into four basic categories. Which of the following
is not an appliance control category? - correct answer-direct unit controls
Before turning the gas on into an interior distribution system when connecting both
vapor meters and regulators for LP-Gas service, you must perform a _____ of the
system. - correct answer-Leak Check
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