Heat pump

An air-to-air heat pump has many of the same components as an air conditioning system. The major difference is that a heat pump also has an

• Reversing valve

• Demand defrost happens only when needed and timed defrost is based on time/temperature.

• Slightly above the initial balance point.

• Initial balance point

The outdoor temperature at which the heat pump provides the same amount of heat as the heat loss of the conditioned space without an auxiliary heat is known as the;

• Initial balance point

• Cooling load.

• As near to the main return air grill as possible.

• Emergency heat mode.

What is the difference between "demand defrost" and "timed defrost"?

• Demand defrost happens only when needed and timed defrost is based on time/temperature.

• In a moderate climate zone.

• Simply disconnect power to the unit momentarily.

• Dividing the Btu's removed by the watts consumed during the cooling season.

The thermostat that controls the auxiliary electric heat according to the outdoor temperature is called the;

• Outdoor ambient thermostat

• Emergency heat mode.

• Emergency heat mode.

• Simply disconnect power to the unit momentarily.

At what temperature is an outdoor ambient thermostat normally set?

• Slightly above the initial balance point.

• Two outdoor coils with each one incorporating a dual stage compressor.

• Emergency heat mode.

• As near to the main return air grill as possible.

The outdoor coil is frozen solid on a "no heat" service call. The most likely reason is;

• The outdoor fan is inoperative.

• The building's heat load.

• Cooling load.

• Two outdoor coils with each one incorporating a dual stage compressor.

In order to determine a heat pumps' balance point, you must first calculate;

• The building's heat load.

• Cooling load.

• Two outdoor coils with each one incorporating a dual stage compressor.

• As near to the main return air grill as possible.

When a heat pump is used for heating and cooling, the system is sized by the;

• Cooling load.

• Two outdoor coils with each one incorporating a dual stage compressor.

• As near to the main return air grill as possible.

• Emergency heat mode.

A high efficiency heat pump system designed to function from high to low ambient conditions below 10*F, may have?

• Two outdoor coils with each one incorporating a dual stage compressor.

• As near to the main return air grill as possible.

• Emergency heat mode.

• Teach the customer how to program the thermostat.

Room thermostats for heat pumps should be installed;

• As near to the main return air grill as possible.

• Emergency heat mode.

• 
  Teach the customer how to program the thermostat.

  
  

• Simulate the defrost cycle.