If a natural gas piping system fails a pressure test, the technician must re-pressurize the system and check for leaks with? - ANS soap bubbles
a pressure relief valve is installed to? - ANS avoid exceeding the system limits
In a refrigeration system, what must be installed at...
If a natural gas piping system fails a pressure test, the technician must re-pressurize the system
and check for leaks with? - ANS soap bubbles
a pressure relief valve is installed to? - ANS avoid exceeding the system limits
In a refrigeration system, what must be installed at 10' intervals on the suction line if the
compressor is above the evaporator? - ANS Trap
What occurs if a 3 amp load is connected to the secondary winding of a 24 volt, 40 V.A.
transformer? - ANS Transformer will fail due to an overload
Flue vent pipe size is determined by the? - ANS Appliance manufacturer and IFGC
In a split system, the condensing unit is remotely located away from the? - ANS Thermistor
Which electronic control is designed to increase or decrease it's resistance with a change in
temperature? - ANS thermistor
Documents that provide information about the hazardous products are ccalled? - ANS
Safety Data Sheet
A type B gas vent is? - ANS Double-walled
How many BTu's are required to melt one ton of ice in a 24 hour period? - ANS 288,000
What is replaced when changing a fusible link on an electric heater? - ANS High limit
switch
When retro-fitting an R-22 system to a R-407C refrigerant system, it is necessary to change
the? - ANS Lubricant from mineral oil to POE oil
Which condition exists if the heat loss of a structure equals the capacity output of the system? -
ANS The balance point has been reached
A combination wiring and crimping tool is used to? - ANS Cut and strip wire
, What is the saturation temperature of R-22 at 69 psig? - ANS 40 F
If the temperature rise (delta T) of the heat exhanger on a gas furnace exceeds the
manufacturers specifications, the technician should do _____? - ANS increase the motor
speed for higher CFM
The nominal CFM required per ton of air conditioning is? - ANS 400
Which refrigerant has a zero ozone depletion potential but is still considered a greenhouse gas?
- ANS R134a
If a TXV power element loses its charge it results in a? - ANS Starved evaporator
Before using an empty recovery cylinder it should be evacuated to how many microns? - ANS
500 microns
The motor shaft rotation direction is located on the? - ANS Motor nameplate attached to
the motor body
Using a voltmeter a technician can identify an open contact on a SPST switch in a A/C series
circuit by reading? - ANS Voltage across contacts
The difference between the "cut-in" and "cut-out" settings of a high pressure control switch is
called the? - ANS Differential
Which load is controlled by the W2 thermostat contact? - ANS second stage heating
Carbon monoxide and radon are classified as? - ANS Air contaminants
On a refrigeration system, what is the type of motor that has a 2-wire, 9 watt condenser fan
motor? - ANS Shaded pole
What is on eof the first things to check for if there is an ignition problem when installing a high
efficiency ICF controlled furance? - ANS improper polarity
To determine the correct amount of ventilation air for a specific application the technician must
consult? - ANS International mechanical code book
Which component of an air conditioner is energized continuously? - ANS crankcase heater
Which calculation determines superheat? - ANS subtract the converted suction pressure
temperature from the suction line temperature
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