Controls

Question 1

What controls do you use for a basic house?

Answer 1

Thermostat

Question 2

(T/F): You can easily use a thermostat to control complex commercial building and should use only that.

Answer 2

False

Question 3

What is the purpose of Building Automation? (5 points)

Answer 3

• Efficient operation of building systems
• Reduced operating costs
• Improved system reliability
• Reduced energy consumption
• Improved occupant comfort

Question 4

What is the earliest form of controls automation?

Answer 4

Pneumatics

Question 5

What is the second advancement in controls automation technology?

Answer 5

Analog-electric

Question 6

A TV clicker is an example of what kind of control system

Answer 6

Analog-electric Control

Question 7

What is the current type of controls system used today? Think Symbio.

Answer 7

Microprocessor Based Controllers

Question 8

What does DDC stand for?

Answer 8

Direct Digital Control

Question 9

What is DDC?

Answer 9

The automated control of a condition or process

Question 10

What word is synonymous with DDC?

Answer 10

Microprocessor

Question 11

What are the attributes of a DDC Controller? (6 Total)

Answer 11

• Software-Based
• Cost-Effective
• Flexibility
• Sophisticated Sequences
• Diagnostics
• Communicate

Question 12

When did Trane enter the controls business?

Answer 12

1978

Question 13

Tracer Symbio controls what?

Answer 13

Units! Acts as the brain of the equipment.

Question 14

In the orchestra x BAS comparison, the Audience refers to the …

Answer 14

Enterprise Level

Question 15

In the orchestra x BAS comparison, the Conductor refers to the …

Answer 15

System Level

Question 16

In the orchestra x BAS comparison, the Instruments and Groups refer to the …

Answer 16

Unit Level

Question 17

What are the Trane-branded words for unit-level controls? (2)

Answer 17

Symbio and Tracer

Question 18

What is the Trane-branded word for system-level controls?

Answer 18

Tracer Synchrony

Question 19

What is the Trane-branded words for enterprise-level controls? (2)

Answer 19

Tracer Ensemble

Question 20

What is the difference between a Thermostat and a Temperature Sensor?

Answer 20

• Thermostat: has control capabilities in it
• Temperature Sensor: “Senses” values (in this case temperature) and reports them to the controller on the RTU

Question 21

What are the (4) major controls deliverables for a consulting engineer?

Answer 21

• Sequence of Operations
• Flow Diagrams
• Points List
• Guide Specs

Question 22

(T/F): In the early days of controls, the main functions of the controls system was turning equipment ON/OFF and Monitoring

Answer 22

True

Question 23

In the evolution of controls what are (3) major innovations of a control system

Answer 23

• Pneumatic
• Analog-Electric
• Microprocessor Based

Question 24

(T/F): No other manufacturer, other than Trane, can factory mount unit controllers in their HVAC equipment.

Answer 24

False

Question 25

What are the benefits of a Unit Controller in a piece of Trane HVAC equipment? (5)

Answer 25

- Programmable for custom applications - Can be factory programmed - Factory installed, tested, & commissioned - Built-in safeties, alarms, & diagnostics - Stand-alone operation of equipment

Question 26

(T/F): A controller point is any input or output signal sent to or from a unit controller.

Answer 26

True

Question 27

(T/F): A calculated high space humidity alarm is an example of a physical control point?

Answer 27

False

Question 28

(T/F): Binary points are different than digital points.

Answer 28

False

Question 29

How does a freezestat work?

Answer 29

A temperature sensor serpentines across coil face and alarms when there is a risk of freezing the coil --> OA damper will close, all valves open to 100%, fan turns off

Question 30

At what OAT do you use fixed dry-bulb economizers?

Answer 30

OAT < Setpoint

Question 31

At what OAT do you use differential dry-bulb economizers?

Answer 31

OAT < RAT

Question 32

At what OAT and OAH do you use fixed enthalpy w/ fixed dry-bulb economizers?

Answer 32

OAT <= 75 F and OAH <= 28 Btu/lb

Question 33

At what OAT and OAH do you use fixed dry-bulb economizers?

Answer 33

OAT <= 75 F and OAH <= RAH

Question 34

What happens when it is NOT okay to economize?

Answer 34

- mechanical cooling maintains temperature - OA dampers controlled for min OA ventilation

Question 35

As a safety, the freezestat is electrically

Question 36

When it's okay to economize but the OA temp < supply air temp, what happens?

Answer 36

- mechanical cooling is disabled - OA dampers maintain temperature

Question 37

When it's okay to economize, the OA temp > supply air temp, but the OA Temp < RA temp, what happens?

Answer 37

- Mechanical cooling maintains temperature - OA dampers are 100% open

Question 38

Where are "PI" Loops used in an Air Handler? (4)

Answer 38

- OA Damper Position - CHW Valve Position - HW Valve Position - Supply Fan Speed

Question 39

What are other applications for "PI" Loops outside of AHUs? (2)

Answer 39

- Cooling Tower Fan Speed - Variable Speed Pump Control

Question 40

During Unoccupied Mode: The OA Dampers are _______, the valves (set point) is _________, and the fans are _______.

Answer 40

- OA Dampers = Closed - Valves = Unoccupied - Fans = Off

Question 41

During Occupied Mode: The OA Dampers are _______, the valves (set point) is _________, and the fans are _______.

Answer 41

- OA Dampers = Min OA Required - Valves = Occupied - Fans = On

Question 42

During Optimal Start Mode: The OA Dampers are _______, the valves (set point) is _________, and the fans are _______.

Answer 42

- OA Dampers = Closed - Valves = Occupied - Fans = On

Question 43

During Optimal Stop Mode: The OA Dampers are _______, the valves (set point) is _________, and the fans are _______.

Answer 43

- OA Dampers = Min OA Required - Valves = Occupied +/- Diff - Fans = On

Question 44

During Nigh Setback Mode: The OA Dampers are _______, the valves (set point) is _________, and the fans are _______.

Answer 44

- OA Dampers = Closed - Valves = Occupied* - Fans = On

Question 45

What is the "Trim" Function?

Answer 45

To maintain comfort, the controls will adjust setpoint to reduce energy use, until feedback from downstream controller requests that comfort is compromised and to "respond" the setpoint upward

Question 46

What is the "Respond" Function?

Answer 46

When the total # of requests rises above the ignored requests threshold, the controls "respond" by readjusting the setpoint until comfort is achieved.

Question 47

What is a commissioning agent?

Answer 47

a 3rd party independent representative contracted directly to the building owner to ensure unbiased performance of the building automation system

Question 48

What are the 2 types of Tracer SC+?

Answer 48

- Application SC+ (Licensed) - Base SC+ (Unlicensed)

Question 49

What is an Application SC+ used for?

Answer 49

controlling a building with applications like scheduling, area, variable air system, chiller plant, etc.

Question 50

What is the maximum number of devices you can load onto an Application SC+?

Answer 50

Up to 240 Devices

Question 51

Application SC+ licenses are sold in packs of QTY _____

Answer 51

15

Question 52

What is a Software Maintenance Plan (SMP)?

Answer 52

Software/firmware upgrades sold as a service agreement

Question 53

What is a Base SC+ used for?

Answer 53

route BACnet and/or connect more devices (unlicensed)