Bacnet Flashcards
1
Q
What does BACnet stand for?
A
Building Automation and Control Network
BACnet is a communication protocol for building automation and control networks.
2
Q
What type of cable is required for BACnet IP connections to the CORE Unit Controller?
A
CAT5 or CAT6 cable.
3
Q
What does the CORE Unit Controller BACnet interface allow?
A
Communication between the CORE Unit Controller and a BACnet MS/TP or IP network.
4
Q
What is the device profile that the CORE Unit Controller BACnet interface communicates with?
A
BACnet Application Specific Controller (B-ASC) device profile.
5
Q
What certification does the CORE Unit Controller BACnet interface hold?
A
Certified to ANSI/ASHRAE 135-2008 and is BTL Listed.
6
Q
How can you pair the Lennox® CORE Service App to the CORE Unit Controller?
A
The app can discover the CORE Unit Controller if within 50 feet and displays units by signal strength.
7
Q
What is the first step to enable the BACnet interface on the CORE Unit Controller?
A
Use the CORE Service App and go to RTU MENU > SETUP > INSTALL.
8
Q
What is a common integration guideline for the CORE Unit Controller?
A
This device does not support Change of Value (COV).
9
Q
List two recommended objects for writing generic applications for single-zone integration.
A
- AO102 (Outdoor Air Min Pos Control)
- AO104 (Occupancy Scheduler Control)
10
Q
What should be done every 2 minutes to the Network Inputs?
A
Write to the Network Inputs (AO111-113).
11
Q
What are the recommended objects for reading unit status?
A
- AI232 (Unit Status)
- AI239 (Space Temperature)
- AI240 (Discharge Air Temperature)
- AI244 (Outside Air Damper)
- AI250 (Supply Fan Status)
12
Q
What is the maximum number of devices that can be included per MS/TP network segment?
A
32 CORE Unit Controller BACnet® interfaces.
13
Q
What is the maximum cable length for BACnet MS/TP without a repeater?
A
4000 ft.
14
Q
When should a 120 ohm resistor be used in BACnet MS/TP connections?
A
At the end of a daisy-chain configuration.
15
Q
What is the recommended baud rate for BACnet MS/TP?
A
38.4 kbps.
16
Q
What should be avoided to minimize communication compatibility problems?
A
BACnet gateways or BACnet devices that are NOT BTL listed.
17
Q
Fill in the blank: The operating temperature range for the CORE Unit Controller is _______.
A
−40F to 155F.
18
Q
True or False: The CORE Unit Controller BACnet interface requires Lennox proprietary software to function.
A
False.
19
Q
What is the device Max_Master property for the CORE Unit Controller?
A
127.
20
Q
What is the purpose of the CORE Service App in relation to the CORE Unit Controller?
A
To enable the BACnet interface and configure settings.
21
Q
What is a key configuration step for BACnet MS/TP?
A
Set the BACnet MAC Address unique for each CORE Unit Controller on the network.
22
Q
What is the maximum baud rate recommended for BACnet units?
A
9.6K
23
Q
How many Lennox BACnet units and devices per router are recommended for higher baud rates?
A
20 Lennox BACnet units and 30 devices per router
24
Q
What does Lennox recommend regarding the use of repeaters in BACnet networks?
A
Lennox does not recommend the use of repeaters due to noise amplification.
25
What is the operating temperature range for the CORE Unit Controller BACnet IP Interface?
-40F to 155F
26
What is the storage temperature range for the CORE Unit Controller BACnet IP Interface?
-40F to 185F
27
What is the recommended relative humidity range for the CORE Unit Controller BACnet IP Interface?
10-95% RH non-condensing
28
What type of connector is used for the BACnet IP interface?
RJ-45
29
What is the maximum cable length for BACnet IP connections?
100 Meters
30
What is the default UDP port address for the CORE Unit Controller BACnet IP Interface?
0xBAC0
31
Fill in the blank: The device Object_Identifier is the last octet of the _______.
IP address
32
What are the three primary control modes available on the CORE Unit Controller?
* Monitor Only
* Room Sensor
* Network Thermostat
33
In Control Mode 'Monitor Only', what is the CORE Unit Controller's response to set points?
The unit will not respond to set points or application mode demands.
34
What happens when the CORE Unit Controller enters a backup mode of operation?
A code 93 will be broadcast over BACnet and displayed at the controller.
35
What is the minimum required update rate for the CORE Unit Controller?
At least every 12 minutes
36
True or False: The CORE Unit Controller supports Change of Value (COV) interface.
False
37
What must be done at least every 15 minutes to avoid the CORE Unit Controller considering the network offline?
The device must be written to
38
What is the purpose of a BACnet Broadcast Management Device (BBMD)?
To manage UDP broadcast packets across different IP subnets.
39
What is the maximum APDU length accepted for BIP?
1476
40
What does the property 'Lennox_Object_Error' indicate?
It reports any error code encountered by the component.
41
What does the property 'Lennox_Object_Run_Time' represent?
The time the corresponding component has been running in minutes.
42
What is the range for the property 'Lennox_Object_Min_Cycle_Time'?
0 to 4294967295 seconds
43
What must be updated at least every 5 minutes if used?
* Network Space Temperature (AO113)
* Network Space Humidity
* Network Space CO2
* Network Thermostat Demands (AO101)
* Network Occupancy (AO104)
* Network Set points (AO109, AV130-133)
44
What does the property 'Object_Temperature' measure?
The temperature in Degrees Fahrenheit
45
What is the function of the 'Object_CO2_Level' property?
It indicates the CO2 levels in space air, measured in PPM.
46
What does the 'Out_Of_Service' property indicate?
Whether the physical component is in service or not.
47
Fill in the blank: The property 'Object_Relative_Humidity' represents relative humidity of space air, measured as a _______.
percentage
48
What is stored in EEPROM once every hour for the compressor?
The time that the compressor has been running
## Footnote
This can lead to a loss of run-time value up to an hour for each power cycle event.
49
What does Lennox_Object_Min_Cycle_Time represent?
The minimum time the compressor must run in any given cycle
## Footnote
This prevents short cycles to help protect the compressor.
50
What does Lennox_Object_Cycle_Count indicate?
The number of cycles the compressor has been running.
51
What does a value of 0 indicate in Lennox_Object_Error?
No error.
52
What is the Object_ID for the Blower in Lennox proprietary objects?
129.
53
What does Object_Name represent in Lennox proprietary objects?
Identifies the Object and is unique within the BACnet Device.
54
What is the range of values for Object_Temperature in discharge air?
Degrees Fahrenheit (-8.75 to 164.45).
55
What does the property Lennox_Object_Running indicate?
Indicates whether the blower or heating device is currently running.
56
In Lennox proprietary objects, what does a TRUE value for Out_Of_Service indicate?
The device is out of service.
57
What is the Object_Type for Heating in Lennox proprietary objects?
130 (OBJECT_LNX_HEATING).
58
What does Lennox_Object_HeatType indicate?
The source of power used for heating.
59
What is the minimum value for the Discharge Air Cooling Set point?
40 Degrees Fahrenheit.
60
What is the maximum value for the Discharge Air Heating Set point?
140 Degrees Fahrenheit.
61
Fill in the blank: The _______ indicates the time the economizer has been running.
Lennox_Object_Run_Time
62
What does Lennox_Object_ECON_FREE_COOL_RUN_TIME represent?
The runtime of Free Cooling.
63
What type of values does Lennox_Object_Installed represent?
TRUE or FALSE.
64
What is the range of values for Object_CO2_Level?
300 to 2000 (PPM).
65
What does the property Object_Relative_Humidity indicate?
Represents relative humidity of space air.
66
What does a non-zero value in Lennox_Object_Error represent?
An error has been encountered.
67
What is the Object_ID for the Economizer in Lennox proprietary objects?
131.
68
What does Object_Duct_Static_Pressure_Set point represent?
The Duct Static Pressure Set point of discharge air.
69
What is the maximum range for the Object_Temperature in space air?
100 Degrees Fahrenheit.
70
Fill in the blank: The _______ indicates the installed status of the heating device.
Lennox_Object_Installed
71
What does the property Lennox_Object_Cycle_Count indicate for the economizer?
The number of cycles the economizer has been running.
72
What is the range of values for the Object_Relative_Humidity?
0 to 100 (%RH).
73
What does the property Lennox_Object_Min_Cycle_Time apply to?
Heating must run in any given cycle.
74
What is the range of the Space Temperature?
63.75 - 100.00 Deg. F
75
What is the range for Discharge Air Temperature?
-8.7 – 164.4 Deg. F
76
What is the Effective Occupancy range?
0 - 2
77
What is the range for Local Outside Air Temperature?
-30.6 – 131.6 Deg. F
78
What does the Outside Air Damper range from?
0 - 100, 255 Percent
79
What is the range for Heat Primary?
0 – 100 Percent
80
What is the range for Cool Primary?
0 - 100 Percent
81
What values can Economizer Enabled take?
0, 1, 255
82
What is the range for Supply Fan Status?
0 - 100 Percent
83
What is the Space Temperature Set Point (Eff) range?
40.0 – 95.0 Deg. F
84
What is the maximum value for Current Error?
255
85
What is the range for Space CO2 Sensor (Eff)?
0 - 2000 Parts-per-million
86
What does the Space Humidity (Eff) range from?
0 - 100 Percent
87
What is the range for Return Air Temperature?
-8.7 – 164.4 Deg. F
88
What is the range for Building Static Pressure?
-0.5 - 0.5 No Unit
89
What is the range for Duct Static Pressure?
0 – 5.00 No Unit
90
What is the maximum RPM for Blower motor speed?
1500
91
What is the range for Outdoor airflow?
0 - 480 cfm/ton**
92
What baud rates are supported for the Baud Rate Setting?
9600, 19200, 38400, 76800
93
What is the range for Heating Occupied Set point?
40 - 95 Deg. F
94
What must the cooling set point be in relation to the heating set point?
Lower than the heating set point by at least the autochangeover dead-band value
95
What is the application mode value for AUTO?
0 $00
96
What is the application mode value for OFF?
6 $06
97
What is the description for application mode value 255?
Same as AUTO
98
What is the range for IAQ Set point Start Open?
0 - 2000 PPM
99
What is the maximum value for the Dehumidification Status?
2
100
What is the application mode for full dehumidification?
233 $E9
101
What is the purpose of the application mode RESET?
Causes the system to reset itself and go through the controller start-up and initialization routines
102
What is the function of the application mode FAN ONLY?
Disables heating and cooling operation but does not affect fan operation
103
What should be the interval for updating the application mode data?
No more than two minutes
104
What happens if the CORE Unit Controller does not receive application mode data within 5 minutes?
It enters the backup mode of operation set locally during commissioning.
105
What is the recommended interval for updating application mode data?
No more than two minutes.
106
What is Object ID 102?
Outdoor Air Min Pos Control.
107
What is the value range for Object ID 102?
0 - 255.
108
What does a value of 0-100 for Object ID 102 represent?
Sets the minimum position of the outdoor air economizer damper; % open.
109
What is the default value for Object ID 102 following a reset?
101 (local).
110
What does Object ID 103 control?
Occupancy Override Control.
111
What does a value of 0 indicate for Object ID 103?
Space occupied.
112
What is the default value for Object ID 103 following a reset?
255 (auto).
113
What does Object ID 104 manage?
Occupancy Scheduler Control.
114
What is the default value for Object ID 104 following a reset?
Determined by Parameter 223.
115
What is the purpose of Object ID 105?
BACnet Device Instance.
116
What is the value range for Object ID 105?
0 - 4194304.
117
What does Object ID 107 indicate when the value is 0?
Occupancy sensor indicates space occupied.
118
What is the default value for Object ID 107 following a reset?
255 (auto).
119
What does Object ID 108 represent?
Space Dehumidification Setpoint.
120
What is the value range for Object ID 108?
0 - 100.
121
What triggers dehumidification according to Object ID 108?
When effective space relative humidity rises to the setpoint value.
122
What is the default value for Object ID 108 following a reset?
Local control.
123
What is Object ID 109 used for?
Temperature Set point (abs).
124
What is the value range for Object ID 109?
36.25 – 100.00°F, in 0.25°F increments.
125
What is the default value for Object ID 109 following a reset?
70°F.
126
What does Object ID 110 represent?
Temperature Set point Offset.
127
What is the value range for Object ID 110?
-32.00 – 31.75°F, in 0.25°F increments.
128
What does Object ID 111 monitor?
IAQ 1 Network Input.
129
What is the value range for Object ID 111?
300 - 2000 PPM.
130
What does Object ID 112 represent?
Humidity Network Input.
131
What is the value range for Object ID 112?
0 - 100.
132
What is the default value for Object ID 113 following a reset?
72.5°F.
133
What is Object ID 114 used for?
Emergency Override Control.
134
What does a value of 0 for Object ID 114 indicate?
Normal operation.
135
What is Object ID 115 responsible for?
Compressor Enable Control.
136
What is the maximum value for Object ID 115?
255.
137
What does a value of 0 for Object ID 115 indicate?
Output disabled.
138
What does Object ID 117 control?
Primary Heat Enable Control.
139
What is the default value for Object ID 117 following a reset?
100%.
140
What is the purpose of Object ID 123?
Duct Static Set point.
141
What is the value range for Object ID 123?
0.0 - 5.0 inW.
142
What does Object ID 125 control?
Discharge Air Cooling Set point.
143
What is the value range for Object ID 125?
40 - 100°F, and -9°F.
144
What happens if -9°F is selected for Object ID 125?
Reverts to locally programmed set point.
145
What does Object ID 126 control?
Discharge Air Heating Set point.
146
What is the value range for Object ID 126?
60 - 140°F, and -9°F.
147
What does Object ID 127 monitor?
Supply Fan Capacity Input.
148
What is the minimum value for Object ID 127?
33.
149
What is the Object ID for Supply Fan Capacity Input?
127
150
What percentage range can the Supply Fan Capacity Input be set?
33 - 255
151
What does a value of 0 indicate for the Set Economizer Outdoor Air Suitable?
Economizer disable
152
What does a value of 1 indicate for the Set Economizer Outdoor Air Suitable?
Economizer enable
153
What is the default value for the Set Economizer Outdoor Air Suitable after reset?
255 (auto)
154
What is the Object ID for the MAC Address?
198
155
What is the value range for the MAC Address?
0 - 127
156
What does the IMC Address Object ID represent?
199
157
What is the value range for the IMC Address?
1 - 31
158
What is the significance of the Object IDs 200 to 207?
They represent IMC Version numbers.
159
What is the Object ID for Unit ID?
231
160
What value range does the Unit ID cover?
0 - 255
161
What does a Unit Status value of 0 indicate?
HVAC idle
162
What does a Unit Status value of 1 indicate?
HVAC heat
163
What temperature range can the Space Temperature input measure?
63.75 – 100.00 degF
164
What is the Object ID for Discharge Air Temperature?
240
165
What is the value range for Discharge Air Temperature?
-8.7 – 164.4 degF
166
What does an Effective Occupancy value of 0 indicate?
space occupied
167
What does an Effective Occupancy value of 1 indicate?
space unoccupied
168
What is the Object ID for Local Outside Air Temperature?
242
169
What is the value range for Local Outside Air Temperature?
-30.6 – 131.6 degF
170
What is the Object ID for Outdoor Air Damper?
244
171
What does a value of 255 indicate for Outdoor Air Damper?
No damper
172
What is the Object ID for Heat Primary?
245
173
What is the range for Heat Primary input?
0 – 100
174
What does the Economizer Enabled Object ID represent?
248
175
What value indicates that the Economizer is disabled?
0
176
What does a Supply Fan Status value of 0 indicate?
Supply fan off
177
What is the Object ID for Space Temperature Setpt (Eff)?
252
178
What is the effective space temperature set point value range?
40.0 – 95.0°F
179
What does a Current Error value of 0 indicate?
No alarm currently in progress
180
What is the value range for Error Pointer?
0 - 83
181
What does the IAQ 2 Effective Value Object ID represent?
273
182
What is the value range for IAQ 2 Effective Value?
0 - 2000
183
What does a Space CO2 Sensor (Eff) value of 0 - 6 indicate?
no sensor
184
What is the Object ID for Space Humidity (Eff)?
276
185
What does a Space Humidity (Eff) value of 0 indicate?
no sensor
186
What is the Object ID for Dehumidification Set Point (Eff)?
278
187
What does a Dehumidification Status value of 2 indicate?
Dehumidification installed and running
188
What is the Object ID for Building Static Pressure?
282
189
What is the value range for Building Static Pressure?
-0.500 – 0.500 inWC
190
What is the Object ID for Duct Static Pressure?
283
191
What is the range of Duct Static Pressure measurement?
0.00 – 5.00 inWC, in 0.02 inWC increments
## Footnote
Measurement from an attached CORE Unit Controller sensor.
192
What are the possible values for Exhaust Fan Status?
0, 1, 2, 33-100, 255
## Footnote
0: Exhaust fan off; 1: Exhaust stage 1 on; 2: Exhaust stage 2 on; 33-100: Exhaust variable speed % on; 255: No exhaust.
193
What does the Supply Airflow Status indicate?
0 – 480 cfm/ton
## Footnote
Legacy Object. Not applicable to the CORE Unit Controller at this time.
194
What is the Blower Motor Speed range?
0 – 1500 RPM
## Footnote
Legacy Object. Not applicable to the CORE Unit Controller at this time.
195
What is the Blower Motor Torque range?
0, 20 – 100
## Footnote
Legacy Object. Not applicable to the CORE Unit Controller at this time.
196
What is the value range for Baud Rate Setting?
9600, 19200, 38400, 76800
## Footnote
Baud rate change only takes effect after the CORE Unit Controller resets.
197
What is the range for Heating Occupied Set point?
40 - 95
## Footnote
Default value following reset is local (P 137).
198
What is the Cooling Occupied Set point range?
40 - 95
## Footnote
Default value following reset is local (Parameter 139).
199
What is the Heating Unoccupied Set point range?
40 - 95
## Footnote
Default value following reset is local (Parameter 138).
200
What is the Cooling Unoccupied Set point range?
40 - 95
## Footnote
Default value following reset is local (Parameter 140).
201
What does the OCC Blower Mode AUTO CYCLES setting do?
Blower cycles on/off with demand.
202
What does the OCC Blower Mode ON-CONTINUOUS 1 setting do?
Blower runs when either the occupancy sensor or schedule indicates occupied.
203
What does the OCC Blower Mode ON-CONTINUOUS 2 setting require?
Blower runs when both the occupancy sensor and schedule indicate occupied.
204
What is the function of the IAQ Set Point Start Open?
The object’s value must be less than Object ID 143.
205
What is the function of the IAQ Set Point Full Open?
This value must be greater than Object ID 142.
206
Fill in the blank: The value range for Free Cooling Enthalpy Offset Setpoint is _______.
1 - 5
207
What is the purpose of After Hours Override Delay Set?
Allows a custom override delay timer.
208
What does the Effective Occupancy AI indicate?
0: space occupied; 1: space unoccupied; 2: space occupied (timed override).
209
What is the range for Blower Motor Torque?
0, 20 – 100
## Footnote
Legacy Object. Not applicable to the CORE Unit Controller at this time.
