3020 3220 Installer Guide with Circ. Fan

3020 3220 Installer Guide with Circ. Fan
®
Installer Manual
Non-Programmable Thermostats
PREMIER
SERIES
3020 Single Stage Conventional Systems
or Single Stage Heat Pumps with Auxiliary Heat
3220 Up to 3 Heat / 2 Cool Heat Pump
Up to 2 Heat / 2 Cool Conventional
Model number is located on back of thermostat.
1 Specifications
2 Installation and Wiring
3 Quick Reference
4 Installer Settings
Warning For installation by experienced service technicians only.
Caution • Possible electric shock or damage to equipment can occur.
• Disconnect power before beginning installation.
This thermostat requires 24 Volt AC Power or 2 properly installed “AA” Alkaline batteries for
proper operation. When connecting 24 Volt AC Power the batteries may be installed as a backup.
For use only as described in this manual. Any other use will void warranty.
Visit www.braeburnonline.com for detailed Installer Guide.
1 Specifications
This thermostat is compatible with:
• Single stage heat / cool conventional and heat pump systems
• Single stage heat pumps with auxiliary heat
• Conventional systems up to 2 stages of heating and 2 stages of cooling (3220 only)
• Heat pump systems up to 3 stages of heating and 2 stages of cooling (3220 only)
• 250 – 750 millivolt heating only systems
• 2 or 3 wire hydronic zone systems
Electrical and control specifications:
Terminations
• Electrical Rating: 24 Volt AC
• 3020: G, Rc, Rh, W1/E, O/B/V3, Y1, C, S1, S2
• 1 amp maximum load per terminal
• 3220: G, Rc, Rh, W1/E/W3, W2, O/B/V3, Y1,
• AC Power: 18 – 30 Volts AC
Y2, C, L, S1, S2
• DC Power: 3.0 Volt DC
(2 “AA” Alkaline Batteries Included)
• Control Range: 45° – 90° F (7° – 32° C)
• Temperature Accuracy: +/- 1° F (+/- .5° C)
3020-100-03
• Outdoor Temperature Display Range: -40° - 120° F (-40° - 49° C)
2 Installation and Wiring
Install your new Braeburn thermostat in 4 basic steps:
1 Install the sub-base
3 Connect your wires
2 Provide Power
4 Attach the thermostat to the sub-base
1
2
Install the Sub-Base:
Provide Power
• Remove the sub-base from the body
of the thermostat.
• Mount the sub-base as shown below:
+
+
UP
UP
For battery power, insert the 2 supplied “AA” type alkaline batteries into the battery compartment located in the
rear housing of the thermostat. Make sure to position the
Positive (+) and Negative (-) sides of the batteries correctly with the +/- symbols in the battery compartment.
Drill 3/16” pilot holes
in your desired location.
Use supplied anchors for
drywall or plaster.
For 24 Volt AC power, you must connect the common
side of the transformer to the C terminal on the thermostat
sub-base. In dual transformer installations, the tranformer
common must come from the cooling transformer.
3 Connect Your Wires
Wiring Terminations for model 3020
Terminal Function
Description
Rc
Input
24 Volt AC Cooling Transformer
(Dual Transformer Systems Only)
Rh
Input
Power Connection (24 Volt AC Heating
Transformer or Millivolt Power Source)
Fan Control
G
Output
W1 / E
Output
(W1) Conventional Heat Relay
(E) Auxiliary/Emergency Heat
O / B / V3
Output
(O) Cool Active Reversing Valve
(B) Heat Active Reversing Valve
(V3) Zone Valve Power Close
Y1
Compressor Relay
C
S1
S2
Installer Manual
Output
Input
24 Volt AC Transformer Common
Input
Optional Remote Sensor (indoor or outdoor)
2
3 Connecting Your Wires (continued)
Wiring Terminations for model 3220
Terminal
Function
Description
Rc
Input
24 Volt AC Cooling Transformer
(Dual Transformer Systems Only)
Rh
Input
Power Connection (24 Volt AC Heating Transformer or Millivolt Power Source)
G
Fan Control
Output
W1 / E / W3
Output
W2
Output
(W1) 1st Stage Conventional Heat,
(E) Emergency Heat, (W3) 3rd Stage Auxiliary Heat
2nd Stage Conventional Heat
O / B / V3
Output
(O) Cool Active Reversing Valve
(B) Heat Active Reversing Valve
(V3) Zone Valve Power Close
Y1
Output
1st Stage Compressor
Y2
Output
2nd Stage Compressor
L
Input
System Malfunction Indicator
C
Input
24 Volt AC Transformer Common
Input
Optional Remote Sensor (indoor or outdoor)
S1
S2
3
Installer Manual
Conventional Systems
Typical Wiring Configurations
NOTE: The “System Type” option will be configured in the Installer Settings section. Shaded areas do not
apply to the 3020.
Heat Only or Millivolt
1 HEAT / 1 COOL Single or Dual Transformer
Set System Type to 11CONV
Set System Type to 11CONV
Rh Power Connection
W1 Heat Relay
G Fan Relay [note 4]
C 24 Volt AC Transformer Common
[note 1]
Hydronic Heat Only
Set System Type to 1HD
Rh
Rc
W1
Y1
G
C
24 Volt AC Power (heating transformer) [note 2]
24 Volt AC Power (cooling transformer) [note 2]
Heat Relay
Compressor Relay
Fan Relay
24 Volt AC Transformer Common [note 1, 3]
2 HEAT / 2 COOL Single or Dual transformer
Rh 24 Volt AC Power (heating transformer)
Set System Type to 22CONV (3220 Only)
W1 Zone Valve Power Open
V3 Zone Valve Power Close
Rh 24 Volt AC Power (heating transformer) [note 2]
Rc
W1
W2
Y1
Hydronic Heat / 1 Cool
Y2
Set System Type to 11HD
G
Rh 24 Volt AC Power (heating transformer) [note 2]
C
Rc 24 Volt AC Power (cooling transformer) [note 2]
W1 Zone Valve Power Open
G
C
Fan Relay [note 4]
24 Volt AC Transformer Common [note 1]
NOTES - Conventional Systems
V3 Zone Valve Power Close
Y1 Compressor Relay
G
C
24 Volt AC Power (cooling transformer) [note 2]
Heat Relay Stage 1
Heat Relay Stage 2
Compressor Relay Stage 1
Compressor Relay Stage 2 [note 4]
Fan Relay
24 Volt AC Transformer Common [note 1, 3]
[1]Optional 24 Volt AC common connection.
[2]Remove factory installed jumper for dual
transformer systems.
[3]In dual transformer systems, transformer
common must come from cooling transformer.
[4]If needed for system.
Fan Relay (cooling fan only)
24 Volt AC Transformer Common [note 1, 3]
Provide disconnect and overload protection
as required.
Installer Manual
4
Heat Pump Systems - Typical Wiring Configurations
NOTE: The “System Type” option is configured in the Installer Settings. Shaded areas do not apply to 3020.
1 HEAT / 1 COOL - No Auxiliary Heat
2 HEAT / 2 COOL - No Auxiliary Heat
Set System Type to 11HP
Set System Type to 32HP (3220 Only)
Rh 24 Volt AC Power
Rc Connected to Rh with supplied Jumper Wire
Rh 24 Volt AC Power
Rc Connected to Rh with supplied Jumper Wire
O/B Changeover Valve [note 2]
Y1 Compressor Relay
O/B Changeover Valve [note 2]
Y1 Compressor 1 Relay (1st stage heating/cooling)
G Fan Relay
C 24 Volt AC Transformer Common [note 1]
Y2 Compressor 2 Relay (2nd stage heating/cooling)
G
Fan Relay
24 Volt AC Transformer Common [note 1]
Optional System Fault Monitor [note 4]
2 HEAT / 1 COOL - Including Auxiliary Heat
C
Set System Type to 21HP (3020 Only)
L
Rh 24 Volt AC Power
3 HEAT / 2 COOL – Including Auxiliary Heat
Rc Connected to Rh with supplied Jumper Wire
Set System Type to 32HP (3220 Only)
O/B Changeover Valve [note 2]
Rh
Y1 Compressor Relay (1st stage heating/cooling)
E Auxiliary/Emergency Heat Relay [note 6]
G
Fan Relay
C
24 Volt AC Transformer Common [note 1]
24 Volt AC Power
Rc
Connected to Rh with supplied Jumper Wire
O/B Changeover Valve [note 2]
Y1
Compressor 1 Relay (1st stage heating/cooling)
Y2
Compressor 2 Relay (2nd stage heating/cooling)
2 HEAT / 1 COOL - Including Auxiliary Heat
E/W3
Auxiliary Heat Relay (3rd stage heating) [note 5] Set System Type to 22HP (3220 Only)
G
Fan Relay
Rh 24 Volt AC Power
C
24 Volt AC Transformer Common [note 1]
Rc Connected to Rh with supplied Jumper Wire
L
Optional System Fault Monitor [note 4]
O/B Changeover Valve [note 2]
NOTES - Heat Pump Systems
Y1 Compressor Relay (1st stage heating/cooling)
[1] Optional 24 Volt AC common connection.
[2] O (cool active) or B (heat active) is selected in
the Installer Settings menu.
[3] Install a field supplied jumper between the
W2 and W1/E/W3 terminals if there is
no separate emergency heat relay installed.
[4] If the L terminal is used, the 24 Volt AC common must be connected (C terminal).
[5] If a separate emergency heat relay is installed, the W1/E/W3 terminal should have both the auxiliary heat 1 relay and emergency heat relay connected.
[6] If a separate emergency heat relay is installed, the W1/E terminal should have both the auxiliary heat 1 relay and emergency heat relay connected.
Provide disconnect and overload protection as required.
W2 Auxiliary Heat Relay (2nd stage heating) [note 3]
E
Emergency Heat Relay [note 3]
G
Fan Relay
C
24 Volt AC Transformer Common [note 1]
L
Optional System Fault Monitor [note 4]
5
Installer Manual
Additional Wiring Options
NOTE: Additional options are configured in the
Installer Settings section.
S1
S2
4
NOTES - Additional Wiring Options
[1]These terminals can be used to connect a
Braeburn® indoor or outdoor remote sensor.
Indoor or Outdoor Remote Sensor [note 1]
Attach Thermostat to Sub-Base
UP
UP
INSTRUCTIONS
1) Line up the thermostat body with the sub-base.
2) Carefully push the thermostat body against the
sub-base until it snaps in place.
3) Insert Quick Reference Card into slot
on top of thermostat.
NOTE: This thermostat ships configured as a 1H/1C conventional
thermostat. Confirm installer settings. See page 8.
Installer Manual
6
3 Quick Reference
10
11
INSTRUCTIONS
12
1
13
14
2
15
16
3
4
5
6
7
8
9
Thermostat and Display
1 Room Temperature..........................Displays the current room temperature
2
Set Temperature..............................Displays the current set point temperature
3
Reset
Button ...................................Resets current time, program and user settings
Button................................Selects the system you want to control
5
BACK Button....................................Moves back in installer/user setup modes
6
NEXT Button.....................................Moves forward in installer/user setup modes
7
RETURN Button................................Returns to normal mode from installer/user setup modes
8
Service Indicators .........................Displays various service/maintenance information
9
FAN Button.......................................Selects the system fan mode
10
Quick Reference Instructions..........Stored in slot located at top of thermostat
11
Low Battery Indicator......................Indicates when the batteries need to be replaced
12
Fan Indicator....................................Indicates when the system fan is running
13
System Status Indicator .................Displays information about the status of the system
14
Lock Mode Indicator .......................Indicates if the thermostat is locked
15
SpeedBar® .......................................Increases or decreases settings (time, temperature, etc.)
16
Outdoor Temperature Indicator.... Displays along with the outdoor temperature reading (see note below)
Installer Clear Button .....................Located on back of thermostat body – clears all settings
Battery Compartment .....................Located in the back of thermostat
4
SYSTEM
NOTE: If a Braeburn® outdoor sensor was connected you can view the outdoor temperature by
pressing the BACK and NEXT buttons at the same time.
7
Installer Manual
4 Installer Settings
The Installer Settings must be properly configured in order for this thermostat to operate correctly. The
Installer Settings are menu driven. The portion of these settings that do not apply to your setup will be
skipped. These settings are indicated below with comments. More detail on each setting follows this table.
INSTRUCTIONS
1. Press and hold down the RETURN
and buttons for 3 seconds.
2. Release both buttons and the first
installer setting will be displayed.
3. Change settings as required using the
or portion of the SpeedBar®.
4.Press NEXT or BACK to move to the
next or previous setting, press
RETURN to exit.
NOTE: Shaded areas below do not apply to the 3020.
No. Installer Setting
Factory (Notes follow this table) Default
Setting
Options
Comments
(More information follows this table)
1 Temperature Scale
F DEG
F DEG
Select for Fahrenheit display
C DEG
Select for Celsius display
2 Auto Changeover
oF AUTO
oF AUTO
Disables Auto Changeover mode
ON AUTO
Enables Auto Changeover mode
11CONV
Select for 1H/1C Conventional system
22CONV
Select for 2H/2C Conventional system
3 System Type
11CONV
11HP
Select for 1H/1C Heat Pump system
21 HP
Select for 2H/1C Heat Pump system (3020 only)
22HP
Select for 2H/2C Heat Pump system
32HP
Select for 3H/2C Heat Pump system
1HD
Select for Heat Only Hydronic system
11HD
Select for Hydronic Heat/1C system
4 1st Stage Differential
0.5 DIF1
0.5, 1.0 or Select a 1st stage temperature differential of
2.0 DIF1.5°, 1° or 2° F (0.2°, 0.5° or 1.0° C)
5 2nd Stage Differential
2.0 DIF2
1.0, 2.0, 3.0, Select a 2nd stage temperature differential of 1°,
[note 1]
4.0, 5.0 or 2°, 3°, 4°, 5° or 6° F (0.5°, 1.0°, 1.5°, 2.0°, 2.5° 6.0 DIF2
or 3.0° C)
6 3rd Stage Differential
2.0 DIF3
1.0, 2.0, 3.0, Select a 3rd stage temperature differential of 1°, 2°,
[note 1]
4.0, 5.0 or 3°, 4°, 5° or 6°F (0.5°, 1.0°, 1.5°, 2.0°, 2.5° or 3.0°C)
6.0 DIF3
Installer Manual
8
No. Installer Setting
Factory (Notes follow this table) Default
Setting
Options
(More information follows this table)
Comments
7
8
9
10
1st Stage Fan Control
HG FAN 1
[note 2]
Emergency Heat]
HE EMER
Fan Control [note 3]
Reversing Valve
REVO
(O/B Terminal) [note 4]
Fossil Fuel
AE AUX
Backup Heat [note 3]
HG FAN 1
HE FAN 1
HE EMER
HG EMER
REVO
REVB
AE AUX
AG AUX
Select for 1st stage Gas heating
Select for 1st stage Electric heating
Select for Electric Emergency Heat
Select for Gas Emergency Heat
Select for cool active Reversing Valve (O terminal)
Select for heat active Reversing Valve (B terminal)
Select for Electric Auxiliary heat (with compressor)
Select for Gas Auxiliary heat (without compressor)
11
Compressor Power Outage oF CPOP
Protection [notes 3, 5]
oF CPOP
on CPOP
Disables Power Outage Lockout Delay
Enables Power Outage Lockout Delay
12 AC Power Interrupt
AC oF MONR AC oF MONR Disables AC Power Interrupt Warning
Warning [note 5]
AC on MONR Enables AC Power Interrupt Warning
13Compressor Short
5 CSCP
5, 4, 3, 2 or Select a compressor short cycle protection delay Cycle Protection [note 6]
0 CSCP of 5, 4, 3, 2 or 0 minutes
14 Residual Cooling
60 FAN
90, 60, 30 Select a Residual Cooling Fan Delay of 90, 60,
Fan Delay [note 6]
or 0 FAN 30 or 0 seconds.
15 Circulating Fan Lock
oF CIRC
oF CIRC
Disables Circulating Fan Lock mode
on CIRC
Enables Circulating Fan Lock mode
16 Indoor Remote Sensor
I SENS
I SENS
Temperature is sensed from thermostat only.
Control* [note 7]
E SENS
Temperature is sensed from remote sensor only.
A SENS
Temperature is combined with the thermostat and the remote sensor.
17 Lockout Security Level
2 LOCK
2 LOCK
If locked – Complete lockout is enabled
1 LOCK
If locked – Partial lockout is enabled (SpeedBar®
is still functional)
18 Auto Changeover
3 BAND
2, 3, 4 or 5 Select a Dead Band of 2°, 3°, 4° or 5˚ F (1.0°, 2.0° or 3.0° C) for Auto Changeover mode.
Dead Band [note 8] BAND 19 Compressor Balance
NO BALC
NO BALC
Point [notes 3, 9]
15-50 BALC
20 Auxiliary Heat Balance
NO BALA
NO BALA
Point [notes 3, 9]
70-40 BALA
90-60 LIM
21 Heat Set Point Upper Limit 90LIM
Cool Set Point Lower Limit 45LIM
45-80 LIM
[note 6]
22
Disables Balance Points
Select a Compressor Balance Point of 15°- 50°F
(-9°-10° C)
Disables Balance Points
Select a Auxiliary Heat Balance Point of 70°- 40° F
(21°- 4.0° C)
Select a Heat Set Point Upper Limit of 90°-60° F
(32°-10° C)
Select a Cool Set Point Lower Limit of 45°-80° F
(7.0°-27° C)
*When
a Braeburn® outdoor sensor is connected, the thermostat automatically recognizes it. Press BACK and NEXT at the
same time to display outdoor temperature.
NOTE: Additional options such as Service Monitors, Setting the lock code, etc. are located in the User
Settings – See User manual for information on setting these options.
9
Installer Manual
NOTES - Installer Settings
1
2
3
4
5
6
7
8
9
Only available if a 2 or 3 stage system type was selected in option 3.
Only available if a Conventional system was selected in option 3.
Only available if a 2 or 3 stage Heat Pump system was selected in option 3.
Only available if a Heat Pump system was selected in option 3.
Only available if the 24 Volt AC common wire is connected to the C terminal.
Not available if a Heat Only Hydronic system is selected in option 3.
Only available if a Braeburn® indoor remote sensor was connected.
Only available if auto changeover was enabled in option 2.
Only available if a Braeburn outdoor sensor was connected.
Detailed Explanation of Installer Settings (also see NOTES above):
1 Temperature Scale – Selects a temperature scale of either °F or °C.
2 Auto Changeover – Selects auto changeover on or off. When auto changeover mode is enabled and selected, the system automatically switches between heating and cooling modes. There is a 5 minute
delay when switching from heating to cooling or cooling to heating in auto changeover mode.
NOTE: Also see “Auto Changeover Dead Band” in option 18.
3 System Type – Selects the system type for your installation. NOTE: Changes made to this option will
reset options 4 through 11 back to their default values dependant on the system type.
4 1st Stage Differential – Selects a 1st stage temperature differential.
5 2nd Stage Differential [note 1] – Selects a 2nd stage temperature differential.
6 3rd Stage Differential [note 1] – Selects a 3rd stage temperature differential.
7 1st Stage Fan Control [note 2] – Selects a 1st stage fan control of either gas or electric heat.
8 Emergency Heat Fan Control [note 3] – Selects emergency heat fan control of either gas or electric heat.
9 Reversing Valve [note 4] – Selects the output state of the O/B terminal. Select O for this terminal to
be active in the cool mode or select B for this terminal to be active in the heat mode.
10
Auxiliary Fossil Fuel Heat Pump Control [note 3] – When set to electric (AE AUX), both the compressor (1st stage) and auxiliary stage(s) will run when a call for auxiliary heat is made. When set to gas (AG AUX), the compressor stage(s) will be locked out one minute after a call for auxiliary heat. NOTE: This option
can be overridden if setting an auxiliary heat balance point in Option 20.
11 Compressor Power Outage Protection [notes 3, 5] – Selects power outage protection on or off. When enabled, this thermostat will provide cold weather compressor protection by locking out the compressor stage(s) of heating for a period of time after a power outage greater than 60 minutes.
12 AC Power Interrupt Warning [note 5] – When enabled, the thermostat will display an outage warning when AC power to the thermostat is lost.
13 Short Cycle Protection [note 6] – Selects the number of minutes the cooling compressor will be locked out after turning off. This short cycle protection is also active in the heat mode if a heat pump system
was selected in Option 3.
Installer Manual
10
14 Residual Cooling Fan Delay [note 6] – Selects a delay for the system fan after the cooling compressor has turned off. This delay will help remove the remaining cool air out of the ductwork providing additional efficiency.
15 Circulating Fan Lock – When enabled, the only user fan options available are ON and CIRC (Circulation).
The AUTO option is not available with this option enabled.
16 Indoor Remote Sensor Control [note 7] – If a Braeburn® indoor remote sensor is connected during installation, the thermostat will automatically detect the sensor. When an indoor sensor is detected, you
may select between thermostat only (I SENS), remote sensor only (E SENS) or combining the thermostat
and the remote sensor (A SENS). NOTE: This option does not apply to a Braeburn outdoor sensor. When
an outdoor sensor is connected the thermostat automatically recognizes it and no further configuration
is necessary.
17 Lockout Security Level – Selects the level of keypad lockout when the thermostat is locked. Level 2
locks the entire thermostat (including the front reset button). Level 1 locks everything except the
SpeedBar® allowing for up and down temperature adjustment. NOTE: The lock code is set in the User
Settings mode (see User Manual).
18
Auto Changeover Dead Band [note 8] – When auto changeover mode is enabled in option 2 and
selected, the system automatically switches between heating and cooling when the room temperature meets the normal criteria for either a heating or cooling call. There is a forced separation (dead band) between the heating and cooling set points so that the systems do not work against each other. This
option selects the amount of this dead band in degrees with the default being 3° F.
19 Compressor Balance Point [notes 3, 9] – Locks out the use of the compressor heat stage when the outside air temperature is less than the selected setting of 15° F to 50° F (-9° C to 10° C).
20
Auxiliary Heat Balance Point [notes 3, 9] – Locks out the use of the auxiliary heat stage when the outside air temperature exceeds the selected setting of 70° F to 40° F (21° C to 4° C). NOTE: This
balance point overrides the fossil fuel compressor lockout in option 10. If this option is set to gas and the outdoor temperature is over the auxiliary balance point, the compressor will remain on during a call
for auxiliary heat.
21 Heat Set Point Upper Limit – Selects the heating set point upper adjustment limit.
22 Cool Set Point Lower Limit [note 6] – Selects the cooling set point lower adjustment limit.
11
Installer Manual
5 System Testing
Warning Read Before Testing
• Do not short (or jumper) across terminals on the gas valve or at the heating or cooling system control
board to test the thermostat installation. This could damage the thermostat and void the warranty.
• Do not select the COOL mode of operation if the outside temperature is below 50º F (10º C). This could possibly damage the controlled cooling system and may cause personal injury.
• This thermostat includes an automatic compressor protection feature to avoid potential damage to the compressor from short cycling. When testing the system, make sure to take this delay into account.
NOTE: The compressor delay can be bypassed by pressing the reset button on the front of the thermostat.
All user settings will be returned to factory default, however all Installer settings will remain as originally
programmed in section 4.
1 Press the SYSTEM button until the thermostat is in HEAT mode.
2 Using the SpeedBar® raise the set temperature a minimum of 3 degrees above the current room temperature. The system should start within a few seconds. With a gas heating system, the fan may not start right away.
3Press SYSTEM until the thermostat is in the OFF mode. Allow the heating system to fully shut down.
4Press SYSTEM until the thermostat is in the COOL mode.
5 Using the SpeedBar lower the set temperature a minimum of 3 degrees below the current room temperature. The system should start within a few seconds (unless compressor short cycle protection is active – See note above).
6 Press SYSTEM until the thermostat is in the OFF mode. Allow the cooling system to fully shut down.
7 Press FAN until the thermostat is in FAN ON mode. The system fan should start within a few seconds.
8 Press FAN until the thermostat is in FAN AUTO mode. Allow the system fan to turn off.
Installer Manual
12
®
Limited Warranty
When installed by a professional contractor, this product is backed by a 5 year limited
warranty. Limitations apply. For limitations, terms and conditions, you may obtain a full
copy of this warranty:
· Visit us online: www.braeburnonline.com/warranty
· Phone us: 866.268.5599
· Write us: Braeburn Systems LLC
2215 Cornell Avenue
Montgomery, IL 60538
5
YEAR
LIMITED
WARRANT Y
Store this manual for future reference.
®
Braeburn Systems LLC
2215 Cornell Avenue • Montgomery, IL 60538
Technical Assistance: www.braeburnonline.com
Call us toll-free: 866-268-5599 (U.S.)
630-844-1968 (Outside the U.S.)
©2016 Braeburn Systems LLC • All Rights Reserved • Made in China.
3020-100-03
Notes
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising