Heating And A/C

Question 0

An accumulator prevents what from entering the compressor?

Answer 0

Liquid refrigerant

Question 1

A standard air conditioning system can easily be converted to a heat pump by the addition of a few key components. T/F

Answer 1

False

Question 2

In a heat pump during the cooling cycle,which coil acts as the evaporator? In the heating cycle, which coil acts as the evaporator?

Answer 2

Indoor/outdoor

Question 3

The _____ ______ directs hot refrigerant to the indoor coil in the _____ cycle in a heat pump .

Answer 3

Reversing valve

Heating

Question 4

Under certain operating conditions,____ will form on the outdoor coil. This can cause a /an ______ in efficiency.

Answer 4

Frost

Decrease

Question 5

The defrost cycle is initiated by ______ and _____.

Answer 5

Time and temperature

Question 6

The most common cause of insufficient airflow in a A/C system is?

Answer 6

• Dirty coil

- dirty filter

Question 7

Ductwork should be _____ enough to handle the volume of air needed for correct A/C operation.

Answer 7

large

Question 8

In a heavy snowfall areas,it is good practice to mount the heat pump’s outdoor unit on a/an ____ to prevent snow from blocking The coil.

Answer 8

Elevated platform

Question 9

Why are heat pumps labeled not to be operated unless power is on for a minimum if 12 hours ?

Answer 9

Oil in the compressor needs to be heated to remove liquid refrigerant

Question 10

A non-technically exhaustive way to evaluate the heat exchanger?

Answer 10

Check flame pattern when the blower comes on

Question 11

Which of the following statements is True for a cooling unit located In a attic where damage may result from condensate overflow?
A. Attic ventilation must be increased to avoid condensation
B. steel ducting is not allowed because of potential damage from condensation
C. A pan with a drain or float switch is required beneath the evaporator unit
D. A supplemental condensate pump is required

Answer 11

C. A pan with a drain or float switch is required beneath the evaporator unit

Question 12

A furnace can be located in a laundry room? T/F

Answer 12

True

Question 13

Converting a heating system fan to cooling type fan requires?

Answer 13

A 2 speed or variable speed fan

Question 14

If a furnace had a pilot with a thermocouple . What device will most likely prevent the furnace from firing if it fails?

Answer 14

Thermocouple

Question 15

An induced draft fan pulls air in what direction ?

Answer 15

Pulls through the furnace

Question 16

Plastic (polyethylene) piping can be used for gas ? T/F

Answer 16

True

Question 17

What is the purpose of a drip leg on a gas line?

Answer 17

• Traps sediment and metal chips

- traps water

Question 18

What does an A/C compressor do?

Answer 18

Pressurizes the refrigerant gas in order to raise its temperature

Question 19

Which part of the A/C cycle removes heat from The refrigerant ?

Answer 19

When it goes through the condenser

Question 20

A heat pump system is primary sized for the?

Answer 20

Cooling load

Question 21

The variation in temperature between the supply air and the return air in the A/C system should be approximately?

Answer 21

14-22 degrees

Question 22

Oil tank-pipes from tank to burners

Answer 22

Must be protected from damage

Question 23

How many sq per ton ac

Answer 23

500 sq ft