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Electric Heat ESCO - HVAC Excellence Exam
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Before working on an electric furnace the tech should ๐ธ๐ธ๐ธ : Review diagram, remove jewelry, and follow safety procedures. ALL OF THE ABOVE. A GFCI circuit breaker ๐ธ๐ธ๐ธ : detects current leaks to groound the conductor in an electric heat element is usually made of ๐ธ๐ธ๐ธ : Nichrome An example of resistive load is ๐ธ๐ธ๐ธ : crankcase heater an example of an inductive load is ๐ธ๐ธ๐ธ : motor
an electric furnace is marked 208/230 single phase 60Hz A tech reads 200 vac at the power supply and determines ๐ธ๐ธ๐ธ : the voltage is too low voltage imbalance between any leg of 3 phase power supply may not exceed ๐ธ๐ธ๐ธ : 2% the limit switch on an electric furnace is a ๐ธ๐ธ๐ธ : Automatic reset switch the sequencer timers on electric heater will usually energize the 1st heating element after a time delay of ๐ธ๐ธ๐ธ : 1 to 30 sec the amount of btus produced by 1 watt of electricity is ๐ธ๐ธ๐ธ : 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 ๐ธ๐ธ๐ธ : 13, a furnace is using 15,500 watts approx Kw
the control that prevents duct heater from operating unless there is adequate supply air is ๐ธ๐ธ๐ธ : fan interlock the COP for electric resistance heat is ๐ธ๐ธ๐ธ : 1 to 1 what is the maximum kW element used on each contact of a residential heat sequencer ๐ธ๐ธ๐ธ : 5 kW electric heaters are generally rated at ____ volts ac for kW output ๐ธ๐ธ๐ธ : 240 the first stage of a sequencer usually has a set of contacts to ๐ธ๐ธ๐ธ : start the blower fan motor an automatic reset safety on a heater element generally opens at ____*F ๐ธ๐ธ๐ธ : 130 - 190 *F most heating elements are mounted on which type of insulator ๐ธ๐ธ๐ธ : mica or ceramic
a 10 kW electric heater operating at 240 v draws 42 amps, what will a 10 kW heater wired to 480 volts draw ๐ธ๐ธ๐ธ : 21 amps the purpose of a sequencer is to ๐ธ๐ธ๐ธ : avoid a sudden power load two major factors in determining the temp rise of an electric furnace are ๐ธ๐ธ๐ธ : furnace KW and CFM a major cause of electrical heat element burn out ๐ธ๐ธ๐ธ : low airflow a tech is checking the resistance on delta wired 3 phase 240 v 15 kW electic duct heater if one element is open he would read ๐ธ๐ธ๐ธ : L 1 to L 2 22 Ohm L 1 to L 3 22 ohm L 2 to L 3 infinity the purpose of setting a heat anticipator properly is to ๐ธ๐ธ๐ธ : control cycling time a 10 kW heater installed in a 2 ton central air conditioning heating furnace should have an air flow of _____ CFM
A tech is checking the output of a 5 kW supplemental heater used with a heat pump. The heating element is controlled by what stage of the thermostat ๐ธ๐ธ๐ธ : Auxiliary heating To measure supply grill air speed, the tech should use an ๐ธ๐ธ๐ธ : anemometer when installing a rooftop heating and cooling unit, to prevent condensate pan problems you should ๐ธ๐ธ๐ธ : trap the drain line the contact points of a sequencer on a live heater may be checked by using this meter ๐ธ๐ธ๐ธ : voltmeter when removing any high voltage component for safety the tech should ๐ธ๐ธ๐ธ : lock out/tag out power panel the best method to install a flexible duct to a metal collar is to ๐ธ๐ธ๐ธ : tie wrap and mastic the inner and outer liners
most residential AC and electric heating system will have a fan system rated for a maxium total pressure loss of ๐ธ๐ธ๐ธ : 0.40 - 0.50 WC (inches of water column) to adjust the airflow on a heater with a belt driven blower you should ๐ธ๐ธ๐ธ : adjust the motor pulley the driven belt width used on fractional HP motor is ๐ธ๐ธ๐ธ : A typical RPM of residential direct driven blower is ๐ธ๐ธ๐ธ : 1000 - 1200 RPM turning vanes are added to sheet metal elbows to ๐ธ๐ธ๐ธ : increase air velocity the maximum recommended return air velocity of a residential filter ๐ธ๐ธ๐ธ : 400 fpm a rigid residential duct system should be desgined for a maxium trunk velocity of ____ FPM ๐ธ๐ธ๐ธ : 700 - 1,
๐ธ๐ธ๐ธ : 15 to 25 amps a tech checks a fan motor run capacitor to ground with an analog ohmeter what resistance scale should be used ๐ธ๐ธ๐ธ : r X 10 K a tech is checking the ressitance of a multi speed blower motor the reading are high to common 10 med to common 12 low to common 14 start to common infinity these reading indicate ๐ธ๐ธ๐ธ : the motor has an open start winding the heating elements in a single phase 15 kW heater are usually wired in ๐ธ๐ธ๐ธ : parallel this type of switch is used to detect supply airflow ๐ธ๐ธ๐ธ : pressure differential the contact points on a de-energized heater relay are checked by using this meter ๐ธ๐ธ๐ธ : ohmeter
a multi speed PSC motor has a start winding and ๐ธ๐ธ๐ธ : a run capacitor a grounding strap must always be used with this motor mount ๐ธ๐ธ๐ธ : resilient motor the best description of a fuse link safety is ๐ธ๐ธ๐ธ : a one time device a megger meter is used to check motors for ๐ธ๐ธ๐ธ : winding insulation quality a tech takes the temp rise of an electric furnace what is being measured ๐ธ๐ธ๐ธ : sensible heat only a typical electronic air cleaner will trap ____ % of air particulates ๐ธ๐ธ๐ธ : 95 - 100% which one of the following filters will create the highest static pressure drop ๐ธ๐ธ๐ธ : pleated fiberglass
๐ธ๐ธ๐ธ : glass enclosed what type of safety is recommended for use with baseboard electric heat ๐ธ๐ธ๐ธ : limit switch to determine the proper heat anticipator setting ๐ธ๐ธ๐ธ : measure the total current in the 24v circuit that passes through the thermostat control bulb and heat anticipator duct heatesr are used generally for ๐ธ๐ธ๐ธ : auxiliary heaters a tech is using an extension ladder to work on roof top unit the top of the ladder should extend ____ beyond the support point ๐ธ๐ธ๐ธ : 3 feet a good description of how a sequencer operates the blower motor on an electric furnace is ๐ธ๐ธ๐ธ : time on - time off a BTU is the amount of heat required to raise the temp of one pound of water ๐ธ๐ธ๐ธ : one degree F
an installed furnace should have a minimum of ____ inches for service access ๐ธ๐ธ๐ธ : 30 what instrument would a tech use to calculate return airflow to a furnace ๐ธ๐ธ๐ธ : velometer the auxiliary terminals on an electric sequencer is normally rated at ๐ธ๐ธ๐ธ : 24 v. 5 amps you are installing 2 sections of a rectangular sheet metal duct to main supply line what connectors are used to secure sections of the trunk line ๐ธ๐ธ๐ธ : S connectors and drive clips metal ductwork tends to transmit noise and fan vibrations to conditioned spaces in residential installations. what types of connectors are specified to control this ๐ธ๐ธ๐ธ : flex connectors fiberglass duct wrap is used to insulate round metal ducts. what is the apporx R - value for 1 inch of this insulation ๐ธ๐ธ๐ธ : between r- 3 & 4
a furnace blower motor is rated at 230 v what would be in the allowable voltages variance ๐ธ๐ธ๐ธ : +- 10% the first stage of the most electric heat sequencers in residential furnace turns on the_____ ๐ธ๐ธ๐ธ : 1 st stage elements or blower and the 1 st stage elements the formula (x = sensible heat BTU/h / (1.08 X TD) ๐ธ๐ธ๐ธ : CFM A tech needs to run thermostat wire 90 ft. to keep voltage drop at a minimum the tech should use ๐ธ๐ธ๐ธ : 16 AWG When measuring the temperature split for an electronic furnace, make sure the temperature probe is not what? ๐ธ๐ธ๐ธ : affected by radiant heat Which type of heat will make items in a room warm to the touch? ๐ธ๐ธ๐ธ : Radiant heating panels
How many amps are used for each 5 kW of heat? ๐ธ๐ธ๐ธ : 15 Amps Which of the following is used in heating doorways, inside, or outside work areas? ๐ธ๐ธ๐ธ : Radiant spot heating
