Heat Pump Prep Test

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 a

• evaporator

• condenser

• reversing valve

• thermostatic valve

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

• Demand defrost depends on a manual action, and timed defrost depends on how cold it is outside

• Demand defrost senses temperature difference across the coil, and timed defrost is signaled by the time clock

• Demand defrost depends on a low-pressure control and timed defrost has and electric defrost heater

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

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

• auxiliary temperature control

• outdoor auxiliary thermostat

• outdoor ambient thermostat

• hold in thermostat

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

• initial balance point

• second balance point

• initial capacity point

• initial efficiency point

At what temperature is an outdoor ambient thermostat normally set

• At 32 degrees Fahrenheit

• Slightly above the initial balance point

• The same as the indoor thermostat

• 15 degrees above the initial balance point

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

• the indoor fan is inoperative

• the unit is overcharged

• the unit is functioning on Auxiliary heat

• the outdoor fan is inoperative

in order to determine a heat pump's balance point, you must first calculate

• The building's heat load

• the consumption of kilowatts at 32 degrees

• the EER of the unit during a particular season

• the brand name of the compressor

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

• heating load

• cooling load

• heating and cooling load combined

• difference between the heating and cooling load

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

• two outdoor coils with each one incorporating a dual stage compressor

• two indoor coils with parallel metering devices

• an auxiliary heat exchanger injected with an ethylene glycol solution

• two compressors which operate in series

Room thermostats for heat pump should be installed

• as far away from the main return air grill as possible

• as near to the main return air grill as possible

• on an outside (cold) wall

• near an exit door or near a window