Oklahoma
Sensible heat is defined as what?
Heat that can be measured
Specific heat is defined as what?
The amount of heat required to raise 1lb of a substance 1 degree.
What is a BTU?
The amount of heat required to raise 1lb of water 1 degree.
Latent heat is defined as what?
Heat used to cause a change of state.
One ton of refrigeration is what?
12,000 Btu/hr
A room thermostat should be mounted at how many feet from the floor? (This is code)
5 feet from the floor
To provide proper oil return to the compressor, The suction line must be pitched toward what?
The compressor
What is the purpose of the external equalizer on a TXV?
To offset for the pressure drop across the evaporator.
What would be the minimum bending radius on 1" soft copper tubing?
5"
What is the heating value of natural gas?
1,000 Btu/cu ft
The purpose of a fan control is to what?
Start and stop the fan motor.
What does a high limit control do?
De-energizes the gas firing circuit upon high bonnet temperatures.
An unconfined space is what?
A space whose volume is greater than 50 cu ft / 1,000 btu of total input of all gas fired appliances.
What is the total free area of a 15" x 24" combustion air opening used with a metal grill with an unknown free area?
270 sq in.
A confined space is what?
A space whose volume is less than 50 cu ft / 1,000 btu/h of total input of all gas fired appliances.
What is the purpose of the reversing valve on an air to air heat pump?
It changes the flow of the refrigerant making the indoor coil the outdoor coil and the outdoor coil the indoor coil.
Which of the following is connected to the top port of a reversing valve?
The discharge line of the compressor.
One horsepower is the same as what?
746 Watts.
One watt equals what?
3,412 Btu's
An open run winding will be indicated by which of the following using an ohmmeter?
Infinite ohms from run to start.
A grounded condition found with an ohmmeter on a compressor motor will be indicated by which of the following?
A zero reading from any terminal to compressor housing.
Series
How is a cooling anticipator wired with the operating contacts?
parallel
What is the purpose of a solenoid valve?
It controls the flow of a fluid.
Which of the following is the correct method for fastening sheet metal joints?
Steel metal screws.