Electric Heat ESCO - HVAC Excellence
Exam | 100% Correct Answers | Verified |
Latest 2024 Version
Before working on an electric furnace the tech should - ✔✔Review diagram, remove jewelry, and follow
safety procedures. ALL OF THE ABOVE.
A GFCI circuit breaker - ✔✔detects current leaks to groound
the conductor in an electric heat element is usually made of - ✔✔Nichrome
An example of resistive load is - ✔✔crankcase heater
an example of an inductive load is - ✔✔motor
an electric furnace is marked 208/230 single phase 60Hz A tech reads 200 vac at the power supply and
determines - ✔✔the voltage is too low
voltage imbalance between any leg of 3 phase power supply may not exceed - ✔✔2%
the limit switch on an electric furnace is a - ✔✔Automatic reset switch
the sequencer timers on electric heater will usually energize the 1st heating element after a time delay
of - ✔✔1 to 30 sec
the amount of btus produced by 1 watt of electricity is - ✔✔3.413 btus
a tech reads 60 amps with a clamp on amp meter on a forced air furnace. the supply voltage is 230 volts
AC, approx how many watts is the furnace using - ✔✔13,800
, a furnace is using 15,500 watts approx Kw - ✔✔15.5 Kw
a sequencer timer use _____ to close the contact points to the heater element - ✔✔heated snap-discs or
bi-metal strips
an electric furnace heating thermostat must - ✔✔open on rise close on drop
a standard thermostat heat anticipator is ____ and wired in ____ with the heating control -
✔✔adjustable/series
some thermostat manufacturers require a jumper connection on the thermostat subbase of heating and
cooling thermostat in order to - ✔✔use a single transformer
most electric heat elements use the following safties to prevent overheating - ✔✔snap disc and fusible
link
a tech reads 70 amps to the single phase heater . the supply voltage is 230 volts Ac. Approx how many
btus is the furnace producing - ✔✔54,949
the control that prevents duct heater from operating unless there is adequate supply air is - ✔✔fan
interlock
the COP for electric resistance heat is - ✔✔1 to 1
what is the maximum kW element used on each contact of a residential heat sequencer - ✔✔5 kW
electric heaters are generally rated at ____ volts ac for kW output - ✔✔240
the first stage of a sequencer usually has a set of contacts to - ✔✔start the blower fan motor
Exam | 100% Correct Answers | Verified |
Latest 2024 Version
Before working on an electric furnace the tech should - ✔✔Review diagram, remove jewelry, and follow
safety procedures. ALL OF THE ABOVE.
A GFCI circuit breaker - ✔✔detects current leaks to groound
the conductor in an electric heat element is usually made of - ✔✔Nichrome
An example of resistive load is - ✔✔crankcase heater
an example of an inductive load is - ✔✔motor
an electric furnace is marked 208/230 single phase 60Hz A tech reads 200 vac at the power supply and
determines - ✔✔the voltage is too low
voltage imbalance between any leg of 3 phase power supply may not exceed - ✔✔2%
the limit switch on an electric furnace is a - ✔✔Automatic reset switch
the sequencer timers on electric heater will usually energize the 1st heating element after a time delay
of - ✔✔1 to 30 sec
the amount of btus produced by 1 watt of electricity is - ✔✔3.413 btus
a tech reads 60 amps with a clamp on amp meter on a forced air furnace. the supply voltage is 230 volts
AC, approx how many watts is the furnace using - ✔✔13,800
, a furnace is using 15,500 watts approx Kw - ✔✔15.5 Kw
a sequencer timer use _____ to close the contact points to the heater element - ✔✔heated snap-discs or
bi-metal strips
an electric furnace heating thermostat must - ✔✔open on rise close on drop
a standard thermostat heat anticipator is ____ and wired in ____ with the heating control -
✔✔adjustable/series
some thermostat manufacturers require a jumper connection on the thermostat subbase of heating and
cooling thermostat in order to - ✔✔use a single transformer
most electric heat elements use the following safties to prevent overheating - ✔✔snap disc and fusible
link
a tech reads 70 amps to the single phase heater . the supply voltage is 230 volts Ac. Approx how many
btus is the furnace producing - ✔✔54,949
the control that prevents duct heater from operating unless there is adequate supply air is - ✔✔fan
interlock
the COP for electric resistance heat is - ✔✔1 to 1
what is the maximum kW element used on each contact of a residential heat sequencer - ✔✔5 kW
electric heaters are generally rated at ____ volts ac for kW output - ✔✔240
the first stage of a sequencer usually has a set of contacts to - ✔✔start the blower fan motor
