Automatic Test; Third Party Control; Cooling/Heating Control; Dehumidification Control - Carrier 48LC Series Controls, Start-Up, Operation And Troubleshooting

Automatic Test

The AUTOMATIC TEST submenu is used to execute all the
applicable tests to the system automatically. These include
independent component, cooling, heating, and a system one.
Table 5 shows the steps taken during the independent, cooling,
and heating automatic tests. The Hold time represents the time at
which that control waits before moving on to the next step.
The AUTO SYSTEM TEST will execute the independent auto
test, then the cooling auto test, then the heating auto test. At the end
of the system auto test a prompt will ask if you want to enter
measured data and complete a service report.
Table 5 – Independent, Cooling, and Heating Automatic Tests
AUTO INDP TEST
Step Action
1 Turn on Crankcase Heater Relay
2 Set ODF1 to the High Cool Speed
3 Set ODF1 to the Minimum Speed
4 Turn ODF1 off
5 Set ODF2 to the High Cool Speed
6 Set ODF2 to the Minimum Speed
7 Turn OD21 off
8 Set ODF3 to the High Cool Speed
9 Set ODF3 to the Minimum Speed
10 Turn ODF3 off
11 Set IDF speed to 100%
12 Set Economizer Damper to 100%
13 Turn on power exhaust 1
14 Turn on power exhaust 2
15 Set Economizer Damper to 0%
16 Turn off power exhaust 2
17 Turn off power exhaust 1
18 Set IDF to the ventilation speed
19 Turn on alarm relay
20 Turn off alarm relay
21 Set IDF to 0% speed
22 Turn off Crankcase Heater relay
AUTO COOL TEST
Step Action
1 Set ODF auto transition
2 Set IDF auto transition
3 Turn on Cool A1 test
4 Turn off Cool A1 test
5 Turn on Cool A2 test
6 Turn on Cool A1 and Cool A2 tests
7 Turn off Cool A1 and Cool A2 tests
AUTO HEAT TEST
Step Action
1 Set IDF auto transition
2 Turn on Heat 1 test
3 Turn on Heat 2 test
4 Turn off Heat 1 and Heat 2 tests

THIRD PARTY CONTROL

Third party controls may interface with the unit SystemVut
controller through the connections described below. See other
sections of these instructions for more information on the related
unit control and configurations.

Cooling/Heating Control

The thermostat inputs are provided on TB1 of the board. The
Unit Control Type configuration, UNIT CONTROL TYPE,
must be 0 (Tstat) to recognize the below inputs. Terminal R is
the 24- -VAC source for the following:
Y1 = first stage cooling
Y2 = second stage cooling
Y3 = third stage cooling
W1 = first stage heating
W2 = second stage heating
G = Indoor fan

Dehumidification Control

On Humidi- -MiZer
are provided with quick connects. The Space Humidity Switch
configuration,
SWITCH
Hold (Sec)
identifies the normally open or normally closed status of this input at
0
HIGH humidity. The RH Sensor configuration, SETTINGS UNIT
30 CONFIGURATIONSANALOG INPUTS CONFIGS SPRH
SENSOR CHANNEL, identifies the point on the MBB (Main Base
30
board) or the IOB (Input Output board) the sensor was wired into.
5

Remote Occupancy

30
30
The remote occupancy input can be provided on one of the
5
configurable inputs, most commonly TB3. The Remote
Occupancy Switch configuration, REMOTE OCC TYPE,
30
identifies the normally open or normally closed status of this input
30
when unoccupied. The Remote Occupancy Channel configuration,
5
REMOTE OCC CHAN, identifies the discrete input (DI) assigned
30
for this function.
60

Remote Shutdown

10
The remote shutdown input is provided for unit shutdown in response
10
to switch input configured most commonly on TB3. The Remote
60
Shutdown Switch configuration, REM. SHUTDOWN TYPE,
10
identifies the normally open or normally closed status of this input
10
when there is no shutdown command. The Remote Shutdown
30
Channel configuration, REM. SHUTDOWN CHAN, identifies the
10
discrete input (DI) assigned for this function.
10

Alarm Output

30
The alarm output is provided on as a configurable relay, most
0
commonly on TB2, to indicate when a current alarm is active. The
output will be 24- -VAC if a current alarm exists. The Alarm Relay
Channel configuration, ALM RELY CHANNEL, identifies the
Hold (Sec)
discrete output (DO) assigned for this function.
0

Economizer Damper Control

0
60
For units with the economizer option or accessory, the damper
30 position can be directly controlled through the IAQ sensor input.
The IAQ Analog Input configuration, IAQ LEVEL CONTROL
60
will have to set to 2 (CTL MINP). When IA.CF = 2, an external 4
30
to 20 mA source is used to move the damper 0% to 100% directly.
60
Hold (Sec)

Display Configuration

0
60
The SETTINGSDISPLAY SETTINGS submenu is used to
configure the local display settings.
60
20
METRIC DISPLAY
This variable is used to change the display from English units to
Metric units.
LANGUAGE
This variable is used to change the language of the SystemVu
display. At this time, only English is available.
CONTRAST ADJUST
This is used to adjust the contrast of the SystemVu display.
12
R system units the HUMIDISTAT and SPRH leads
SETTINGSUNIT
INPUTS CONFIGSHUMSTAT

CONTROLS OPERATION

CONFIGURATIONS
CHANNEL