Deck 40: Typical Operating Conditions

Question 1

The larger the EER rating, the less efficient the equipment.

Answer 1

False

Question 2

A 4-ton air-conditioning system that requires an input power of 5 kW would have an energy efficiency ratio of ____________________.

Answer 2

9.6

Question 3

Most occupants will normally operate their system at about ____°F.

A) 68
B) 72
C) 75
D) 80

Answer 3

C

Question 4

For residential air-conditioning units, ____________________ V single-phase is the typical voltage.

Question 5

At typical operating conditions, the high efficiency air-conditioning system will operate with an evaporator boiling point of ____°F.

A) 40
B) 45
C) 50
D) 55

Question 6

Ratings that are not completely accurate are known as ____.

A) load ratings
B) maximal ratings
C) nominal ratings
D) floor ratings

Question 7

The condenser ____________________ heat.

Question 8

A four-pole motor runs at ____________________ rpm.

Question 9

The evaporator ____________________ heat.

Question 10

Since the evaporator absorbs both sensible and latent heat, humidity must be taken into account and considered part of the load on the evaporator.

Question 11

AHRI rates condensers with ____°F air passing over them.

A) 70
B) 75
C) 85
D) 95

Question 12

Typically, the fan will run on high speed when the outdoor temperature is above ____________________°F.

Question 13

High efficiency condensers can actually be too efficient on cool days.

Question 14

A more accurate rating system for air-conditioning equipment that takes into consideration operation during the complete cycle is the ____ standard.

A) ARI
B) ACCA
C) SEER
D) EER

Question 15

At typical operating conditions, the standard air-conditioning system will operate with an evaporator boiling point of ____°F.

A) 40
B) 45
C) 50
D) 55

Question 16

A normal evaporator superheat at the evaporator outlet in a standard efficiency air-conditioning system operating under design conditions will be ____°F.

A) 10
B) 15
C) 20
D) 25

Question 17

Air-conditioning systems normally move about ____________________ cfm of air per ton.

Question 18

At what conditions are air-conditioning systems rated?

A) 95°F outdoors - 70°F DB - 50% indoors
B) 95°F outdoors - 75°F DB - 50% indoors
C) 95°F outdoors - 80°F DB - 50% indoors
D) 100°F outdoors - 80°F DB - 60% indoors

Question 19

The electrical operating conditions are measured with a voltohmmeter and a(n) ____________________ .

Question 20

The ____ rating is a steady-state rating and does not account for the time the unit operates before reaching peak efficiency.

A) ARR
B) SAR
C) DER
D) EER

Question 21

Why does the high efficiency system have a higher operating efficiency?

Question 22

What are the three major power-consuming devices that may have to be analyzed from time to time on an air-conditioning unit?

Question 23

Why does high-efficiency air-conditioning equipment use a thermostatic expansion valve?

Question 24

What are three things that must be considered when the manufacturer publishes typical operating conditions?

Question 25

What is starting point for considering electrical operating conditions?