Why would a preheat coil be used on the energy-recovery wheel? ...

[clippers!]

Why would a preheat coil be used on the energy-recovery wheel?
 
  A) To dry the intake air B) To prevent moisture transfer to the supply air
  C) To prevent frost from forming on the wheel D) To warm the exhaust air

Question 2

Most heat pumps have two metering devices because:
 
  A) Two metering devices allow two stage operation.
  B) Each coil must function as the evaporator during one of the cycles.
  C) Two metering devices allow for extra refrigerant flow at low outdoor temperatures.
  D) One metering device serves as a backup to the primary metering device.

[leahm14]

Answer to Question 1

C

Answer to Question 2

B

[clippers!]

TY

[leahm14]

You're welcome