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19 Cards in this Set
- Front
- Back
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How is the high temperature limit control wired into the circuit |
Series |
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How is the manual reset flame rollout switch connected to the control system |
Series |
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How is a meter connected to a circuit to obtain a voltage reading |
Parallel power on |
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How is a meter to a circuit to obtain and amperage reading |
Series power on |
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Minimum gauge of wire that can be used with a 24 volt circuit |
18 gauge |
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How is a meter connected to a circuit to attain a resistance reading |
Parallel power off |
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What would a multimeter read if the voltage at the thermostat r w terminals were taken with the contacts open |
There would be an AC volt reading |
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Why would an amperage reading be taken at the thermostat with the contacts open during the furnace set up |
To ensure the heat anticipator get set correctly |
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How is the blower relay coil wired in relation to the gas valve |
Parallel |
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Why is the voltage reading across limit control or flame rollout or near zero |
Because the switch contacts are closed |
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Where should the hot wire connect to on a thermostat |
Terminal r |
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How many control switches may be wired into the common neutral wire |
None |
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How can a 24 volt control system be differentiated from a millivolt control system |
A thermocouple will be used in a 24 volt control system |
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What color wire may not be used as a current-carrying wire |
Green |
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What is the purpose of the high temperature limit control in a forced air furnace |
It prevents the unit from becoming hot enough to start a fire |
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When energized how does a diaphragm gas valve respond |
It opens slowly |
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What does the following best describe, the minimum millivolts required to open the operating gas valve |
Pull in voltage |
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How would an eco or energy cut off be connected on the fireplace gas valve |
Connected in series with the thermocouple / power unit circuit |
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What would a multimeter read in millivolts terminals were taken with the contacts open |
There would be a DC millivolts reading |
