Iaq Sensor; Oaq Sensor; Display Configuration; Modes - Carrier 50PG20-28 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

IAQ Switch -- For units with the economizer option or
accessory and the ECB control board, the IAQ switch input
is provided on the field connection terminal board (TB2). The
IAQ Switch Input configuration, Configuration-->AIR.Q
--->I!.CEidentifies the nonnatly open or nonnatly closed status
of this input when the indoor air quality value is low (good)
and also selects the unit response to this input.
6 24 VAC source for dry contact
7 24 VAC simaal input
NOTE: An IAQ switch cannot be used if an enthalpy switch is
already on this input.
IAQ Sensor -- For units with the econolnizer option or
accessory and the ECB control board, the IAQ sensor input
is provided on the field connection terminal board (TB2). The
IAQ Analog Input configuration, Configumtion-->AIR.Q
---_IA.(T selects the unit response to this input. Default conver-
sion to 0 to 2000 ppm can be changed in the configurations.
2 4-20 mA + simnat
3 4-201hA colrnnon
OAQ Sensor -- For units with the economizer option or
accessory and the ECB control board, the OAQ sensor input is
provided on the field connection tenninat board (TB2). The
OAQ Analog Input configuration, Configumtion--_AIR.Q
--->OA.15T selects the unit response to this input. Default con-
version to 0 to 2000 ppm can be changed in the configurations.
3 4-20 mA COlranon
4 4-20 mA + simaat
NOTE: An OAQ sensor cannot be used ifa humidity sensor is
used.
CONTROLS OPERATION
Display Configuration
-- The Configuration-->DISP
submenu is used to configure the local display settings.
Metric Display (METR) This variable is used to change
the display tiom English units to Metric units.
Language Selection (LANG) This variable is used to
change the language of the ComJortLink display. At this time,
only English is available.
Password Enable (PROT) This variable enables or dis-
ables the use of a password. The password is used to restrict
use of the control to change configurations.
Selwice Password (PSWD) This variable is the 4-digit
numeric password that is required if enabled.
Test Display LEDs (TEST) This is used to test the opera-
tion of the ComJbrtLink display.
M odes -- The ComJortLink controls operate under a hierar-
chy of colrnnand structure as defined by tbur main elements:
the System Mode, the HVAC Mode, the Occupied stares, and
the Unit Control Type.
The System Mode is the top level that defines three main
states of the control system: Disabled, Enabled, or Test.
The HVAC Mode is the next level that defines four main
states of functional operation: Disabled, Fan Only, Cool, and
Heat.
The Occupied stares affects set points for cooling and
heating in Space Sensor control mode and operation of the
economizer for indoor air quality ventilation and fiee cooling.
The Unit Control Type (Configutvttion-->U?CTT-->U.CTL)
de151es if temperature control is based on thermostat inputs or
space temperature sensor input.
The general operating mode of the control and the stares of
some related operation lockouts are located on the display at
two locations: Run Status _ MODE and Operating Modes---_
MODE.
System Mode (SYS) In Run Stares, the current system
mode is displayed as a number with expandable text. In
Operating Modes, system mode is displayed as expandable
text.
RUN STATUS OPERATING MODES
NUMBER EXPANDED TEXT EXPANDED TEXT
1 Disabled Unit Operation Disabled
2 Enabled Unit Operation Enabled
3 Test Serv ce Test Enab ed
HVAC Mode (HVA153 In Run Status, the current allowed
HVAC mode is displayed as a number with expandable text. In
Operating Modes, HVAC mode is displayed as expandable
text.
RUN STATUS
NUMBER EXPANDED TEXT
1 Disabled
2 Fan Only
3 Cool
4 Heat
OPERATING MODES
EXPANDED TEXT
HVAC Operation Disabled
Ventilation (Fan Only)
Cooling or Free Cooling
Heating
NOTE: Optional Humidi-MiZer
TM
operation is included
within Cooling 1node.
Currently Occupied (OI5'153 Displays the current state of
assumed space occupancy based on unit configuration and
inputs.
Timed Override in Effect (T.OVR) Displays if the state of
occupancy is currently occupied due to an override.
Linkage Active (LINK) Displays if a linkage master in a
zoning system has established "linkage" with this unit.
Circuit OAT Lockout (C.L0153 Displays if one or more
refiigerant circuits operation is prevented due to outdoor
temperature limit lockout.
Heat OAT Lockout (H.L0153 Displays if heating operation
is prevented due to outdoor temperature limit lockout.
Econo Cool OAT Lockout (E.LOC) Displays if econo-
mizer operation for cooling is prevented due to outdoor
temperature limit lockout.
Unit Configuration-
Many configurations that indi-
cate what factory options and/or field accessories are installed
and other colrnnon operation variables are included in Unit
Configuration (15bnfiguration--+UNII). Configuration will be
done at the factory for any factory-installed option (FIOP).
Start-Up Delay (S.DLI) This configuration sets the con-
trol start-up delay after the power is interrupted. This can be
used to stagger the start-up oflnultipte units.
Unit Control Type (U.CTL) This configuration defines if
temperature control is based on thermostat inputs or space
temperature sensor input.
• U.CTL = 2 (Thermostat) The unit determines cooling
and heating demand by the state of G, Y1, Y2, W1, and
W2 inputs from a space therlnostat. This value is the
factory default.
• U.CTL = 3 (Space Sensor) The unit determines cooling
and heating delnand based on the space temperature and
the appropriate set point.
Thermostat Control Type (T..CTL) This configuration ap-
plies only if Unit Control Type is Therlnostat (15bnfigumtion
--->Un#-->U.15TL = 2). The value determines alternative cool-
ing and Hmnidi-MiZer circuit staNng. See the Cooling and
Humidi-MiZer sections for more il_'onnation. The factory
default value is T.15TL= 0 (Adaptive).
Fan On When Occupied (OC.FN) This configuration ap-
plies only if Unit Control Type is Space Sensor (Configm.ation
_Un#--+U.15TL = 3). A YES value wilt operate the indoor t_an
whenever the unit is in the Occupied mode. A NO value wilt
operate the indoor tan only when heating or cooling is neces-
salT. The factory default value is YES.
39