Calibration

Question 1

Which of the heat rejection loops are represented by an HVAC system consisting of air-cooled chillers feeding fan coil units?

Answer 1

• Airside
• Refrigeration Loop
• Chilled Water

Question 2

In a system served by series fan powered boxes, the airflow into the space during occupied hours is:

Answer 2

Constant Volume

Question 3

By definition, DX systems can NOT be water cooled (T/F)

Answer 3

False

Question 4

In a split system which of the refrigeration lines run between outdoors and indoors components and which of the lines is insulated?

Answer 4

• Liquid line without insulation
• Suction line with insulation

Question 5

What value accounts for the thermal mass of a roof or wall?

Answer 5

CLTD

Question 6

What would NOT be considered a space load?

Answer 6

Return air heat pickup

Question 7

A window facing which direction would be expected to have a higher solar radiation load at 8AM?

Answer 7

East

Question 8

The air handling has a comparative enthalpy economizer. The return air enters the mixing box at 80/62. The outside air is 85/60. Will the economizer engage?

Answer 8

Yes

Question 9

The AHU system you are designing has a draw-thru fan with 5 degrees of motor heat. Will you need to use a phantom line to determine the off coil?

Answer 9

Yes

Question 10

In what year did Trane enter the HVAC Controls business?

Answer 10

1978

Question 11

What are the top 3 deliverables for a BAS system design?

Answer 11

• Sequence of Operations
• Flow Diagram
• Points List

Question 12

ASHRAE 62.1 defines the rules for use in airside economizers (T/F)

Answer 12

False

Question 13

What is the name of the economizer mode where it’s OK to economize with the outside temperature below the return air temperature, but above the supply air temperature setpoint?

Answer 13

Integrated Economizer

Question 14

What remains constant as refrigerant moves through the expansion device?

Answer 14

Enthalpy

Question 15

Subcooling decrease the refrigeration effect (T/F)

Answer 15

False

Question 16

The amount of heat in the refrigerant leaving the evaporator is ____ the amount of heat in the refrigerant leaving the condenser

Answer 16

Greater Than

Question 17

What is the term for the acoustical energy emitted by the sound source? It is not affected by the environment.

Answer 17

Sound Power

Question 18

In order to perform S-P-R acoustical analysis, equipment sound information should be presented in terms of…

Answer 18

Sound Power

Question 19

A size 24 Q fan is selected to deliver 11,000 CFM and develop 4” wg of static pressure. After installation, the fan delivers 9,500 CFM and spins at 2405 RPM. Why is the actual airflow lower than the design airflow?

Answer 19

The system static pressure is higher than 4” wg and the fan rode the fan performance curve to a different operating point

Question 20

According to the affinity laws, a 10% increase in fan CFM results in a ____ increase in fan BHP

Answer 20

33%

Question 21

Which method of sizing ductwork tends to be self-balancing and remains relatively well balanced even under conditions of varying flow rate?

Answer 21

Static Regain Method

Question 22

The Bernoulli Equation is a representation of what?

Answer 22

The conservation of energy

Question 23

What Tracer BAS product is at the enterprise level?

Answer 23

Tracer Ensemble

Question 24

What Tracer BAS product is at the unit level?

Answer 24

Symbio

Question 25

What Tracer BAS product is at the system level?

Answer 25

Tracer SC+

Question 26

What are the (5) strongest Tracer BAS value propositions?

Answer 26

- Ensemble Tenant Services/Work Order Management - SC+ Applications - AirFi Wireless - Hosted Cloud Ensemble - Factory Mounted, wired and programmed controls

Question 27

Low delta T syndrome may result in... (4)

Answer 27

- an increase in chilled water pumping energy - an increase in fan energy on the air handler - an increase in condenser water pumping energy - an increase in cooling tower fan energy

Question 28

What are causes of Low Delta T syndrome in a Decoupled loop chiller plant? (3)

Answer 28

- air handler cooling coils that haven't been cleaned in years - using 3-way control valves, or leaking control valves, on the air handler coils - chilled water temperature sensors that are out of calibration

Question 29

IPLV was developed to allow an engineer to quickly determine the yearly energy consumption for a chiller plant (T/F)

Answer 29

False

Question 30

What is Q in the equation Cv = Q / sqrt(delta P)?

Answer 30

The flow rate through a valve

Question 31

What are (2) parameters that determine the compressor power required for a centrifugal chiller?

Answer 31

- Refrigerant mass flow rate - Lift

Question 32

What supply fan contol options are available on Precedent RTUs? (2)

Answer 32

SZVAV and MZVAV

Question 33

Odyssey split systems are made where?

Answer 33

Monterrey, Mexico

Question 34

What is the benefit to the customer of marine water boxes over non-marine water boxes?

Answer 34

with marine water boxes, you don't have to disconnect the building pipes to clean the tubes

Question 35

What is the benefit of using low pressure refrigerants with a Centrifugal chiller? (2)

Answer 35

- better efficiency - low refrigerant leak rate due to low operating pressure

Question 36

Under what operating conditions does a centrifugal chiller with a frequency drive save energy compared to a centrifugal with an mechanical starter?

Answer 36

Part lift conditions

Question 37

What are the (4) principle design feature of a Trane CTV?

Answer 37

- Low pressure refrigerant - multi-stage compressors - Direct Drive compressors - semi-hermetic

Question 38

Which model of Trane air handler is the least expensive that has a variable aspect ratio and was designed to compete with Temtrol?

Answer 38

PSCA

Question 39

What is the least expensive central station air handler with double wall construction?

Answer 39

UCCA

Question 40

Which RTU is designed to fit on the curb of existing IPAKs that are approaching the end of their useful life?

Answer 40

IPAK 1

Question 41

The Intellipak Replacement Unit (IRU) option available on some IPAKs is for applications where... (2)

Answer 41

- Some tonnages where the new condenser is bigger and needs more support - Existing units that have full perimeter curbs

Question 42

Which ASHRAE standard covers ventilation requirements for commercial buildings?

Answer 42

ASHRAE 62.1

Question 43

What is the primary benefit of demand control ventilation?

Answer 43

Energy savings

Question 44

The requirements of ASHRAE Standard 15 vary depending on several things including... (3)

Answer 44

- System probability classification - Building occupancy classification (residential, institutional, etc.) - Safety group classification of the refrigerant determined by ASHRAE Standard 34

Question 45

The difference between the MERV rating and MERV-A is that MERV-A takes into account:

Answer 45

Removing static electricity charge for testing

Question 46

In the SC+, Occupancy is defined by... (2)

Answer 46

- Areas - Time of day schedules

Question 47

What is the maximum number of unit controllers that can be licensed to an Application SC+?

Answer 47

240

Question 48

When using BACnet across AirFI, what is the maximum number of WCI coordinators that can be attached to a SC+ hardware?

Answer 48

8

Question 49

When using BACnet across MS/TP, what is the recommended maximum of unit controllers for the SC+ hardware?

Answer 49

90

Question 50

What are cooling mode AHRI conditions for an air-cooled chiller?

Answer 50

54/44

Question 51

What are tower AHRI conditions?

Answer 51

85/94.3