When the coil is dirty the ________ ________ rises
What is Head Pressure
100
Air cooled condenser the outside air temperature is 95F and _______ is the condensing temperature
What is 125F
100
VFD
What is Variable Frequency Drive
100
Even the cleanest water cannont stop me from becoming an insulator
What is Mineral Deposits and Scale
100
Water used to make-up for the water lost in the evaporation process
What is Make-Up Water
200
Low head pressure may mean a starved evaporator coil and the _______ may not be returning to the compressor
What is Oil
200
Water regulating valve has to __________ when the head pressure rises to allow __________ water to flow
What is Open and More
200
Pressure operated control which allows air in and out of the air-colled condenser
What is Air Shutters or Dampers
200
On a condensing unit with multiple fans, one fan turns off and I will do this
What is Raise the Head Pressure
200
Refrigerant moving counter to the flow of water moving counter to the flow of refrigerant moving counter to the flow of water in a tube-within-a-tube condenser coil
What is Counter-Flow
300
Tube-within-a-tube this in the outer tube
What is Refrigerant
300
Condensers desuperheat the vapor, subcool the liquid and this third function
What is Condense Vapor Into A Liquid
300
Requires large refrigerant charge and over-sized receiver
What is Condenser Flooding
300
Coaxial coils cannot be mechanically cleaned but can be
Chemically Cleaned
300
Water-cooled condenser can be insulted by mineral deposits that act as an _________ to heat transfer
What is Insulator
400
Tube-within-a-tube the refrigerant and water move in this direction
What is Opposite
400
Discharge gas is 200F and condensing temperature is 125F
What is 75F of Desuperheating
400
Winter and summer condenser coils
What is Condenser Splitting
400
In winter structures heat can be rejected to the inside reducing this
What are Heating Costs
400
Variable-frequency drive motors use _________ motor speeds
What is Variable
500
Large condenser coils will experience a __________ ______ occur as the refrigerant flows through the condenser and it is caused by _______
What is Pressure Drop and Friction
500
Condensing temperature is 125F and liquid line temperature is 110F
What is 15F Subcooling
500
Electrical contacts start and stop the fan motor
What is Fan Cycling
500
Removing sensible heat by lowering hot gas temperature
What is Desuperheating
500
Holding back the liquid into the condenser coil can be accomplished by using this type of valve which is backing up the liquid to increase the head pressure by flooding portions of the coil which will inactivate a portion of the condenser and cause it to have a smaller internal volume causing desuperheating and condensation to take place.