CETP 4.5 Basic Propane Appliance
Service and Troubleshooting
________ can be formed into a number of shapes; straight, U-shaped, disc shaped,
and coiled. - correct answer-Bimetals
_________ are two pieces of metal known to expand at different rates when heated.
________ sense temperature change and either open or close a switch. - correct
answer-Bimetals
___________ switches sense the flow of air. The __________ is a type of ________
switch that can be used on propane appliances. - correct answer-Air flow, sail switch,
air flow
____________ are designed for general purpose measurement of air, surface, and
gases. Extremely fast response time because of a small exposed tip. - correct
answer-Bead Probes
_______________ are safety devices. - correct answer-High limit controls
_______________ sensors are used on storage water heaters to sense the
temperature of water inside a water heater activate a switch that allows gas to flow to
the burner to heat water. - correct answer-Rod and tube
________________ were developed for unvented room heaters. - correct
answer-Oxygen Depletion Sensor (ODS)
,__________________ gas valves are used with some older mobile home furnaces. -
correct answer-slow opening
_____________________ should be tested for proper operation as apart of
preventative maintenance. - correct answer-Safety shutoff devices
A ________ used as a safety switch generally is normally closed (NC) and opens on
a temperature rise. - correct answer-bimetal
A ____________ is used only for a short time to give little extra power to start a
motor. Any _________ over 70 microfarads is a ____________ . - correct
answer-start capacitor, capacitor, start capacitor
A ____________ operates for the entire cycle of the motor operation. - correct
answer-run capacitor
A _______________ gas control valve is similar to a standard opening gas control
valve for other operators. - correct answer-snap-action
A 24-volt operator is commonly used for appliances such as ________ and
_________ that have standing pilot or electronic ignition systems. - correct
answer-furnaces, boilers
A bimetal sensor rated L140-40F is operating correctly if the switch opens at 120
degrees, T/F? - correct answer-False
, A Combustible Gas Indicator (CGI) can also signal an alarm when the level of gas
concentration in the air reaches/exceeds preset points marking the flammability
range. These presets points are called ____ or ____ for ____________ or
____________. - correct answer-LEL, LFL, Lower Explosive Limit, Lower
Flammability Limit
A common cause of no heat service calls is that a ________________ has opened. -
correct answer-limit switch
A gas control valve should be replaced if it is difficult to turn by hand, T/F? - correct
answer-True
A thermopile is energized when the _________ surrounds the tip of the thermopile.
The thermopile provides the power to operate the ______________ through the
thermostat circuit. - correct answer-pilot flame, gas control valve
All electrodes will spark at a rate of approximately ___________ per second. -
correct answer-2 1/2 pulses (sparks)
Almost 120 volts are used to power the igniter. Generally only
___________________ are required to operate the gas valve, depending on the
type of valve and igniter. - correct answer-3 volts (and 3.2 to 3.5 amps)
As propane vapor passes through orifice to the burner, it mixes with
_________________ . - correct answer-primary air
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