Carrier 50HCQA Installation Manual download pdf (Page 14)

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 from English units to

Metric units.

Language Selection (LANG)

This variable is used to change the language of the ComfortLink

display. At this time, only English is available.

Password Enable (PROT)

This variable enables or disables the use of a password. The

password is used to restrict use of the control to change

configurations.

Service 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 operation of the ComfortLink display.

Unit Configuration

Many configurations that indicate what factory options and/or field

accessories are installed and other common operation variables are

included in Unit Configuration (ConfigurationUNIT). These

configurations will be set in the factory for the factory--installed

options (FIOPs). Field--installed accessories installed will require

configuration changes. General unit and fan control configurations

are also covered under this Unit Configuration menu.

Start--Up Delay (S.DLY)

This configuration sets the control start-up delay after the power is

interrupted. This can be used to stagger the start-up of multiple

units.

Unit Control Type (U.CTL)

This configuration defines if temperature control is based on

thermostat inputs or space temperature sensor input.

S 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 thermostat. This value is the factory default.

S U.CTL = 3 (Space Sensor) – The unit determines cooling and

heating demand based on the space temperature and the

appropriate set point. Used also as Linkage configuration. The

jumper wire in the installer’s packet must be connected between

R and W1 on the low voltage terminal board for heating mode to

operate.

Thermostat Control Type (T.CTL)

This configuration applies only if Unit Control Type is Thermostat

(ConfigurationUnitU.CTL = 2). The value determines

alternative cooling and Humidi-MiZer circuit staging. See the

Cooling and Humidi-MiZer sections for more information. The

factory default value is T.CTL =0(Adaptive).

Fan Status Switch (FN.SW)

This configuration identifies if a fan status switch is installed, and

what status (normally open, normally closed) the input is when the

indoor fan is OFF.

Filter Status Switch (FL.SW)

This configuration identifies if a filter status switch is installed, and

what status (normally open, normally closed) the input is when the

filter is CLEAN.

Fire Shutdown Switch (FS.SW)

This configuration identifies if a fire shutdown switch is installed,

and what status (normally open, normally closed) the input is when

the fire or smoke alarm is OFF (no alarm).

Remote Occupancy Switch (RM.SW)

This configuration identifies if a remote occupancy switch is

installed, and what status (normally open, normally closed) the

input is when UNOCCUPIED.

SAT Settling Time (SAT.T)

This configuration sets the settling time of the supply air

temperature (SAT). This tells the control how long to wait after a

stage change before trusting the SAT reading. See Adaptive

Thermostat Control (U.CTL =2, T.CTL =0) and Space Sensor

Control (U.CTL =3) within the Cooling operation section for

more information. The factory default value is 240 seconds.

RAT Sensor Installed (RAT.S)

This configuration identifies if a return air temperature (RAT)

sensor is installed. A YES value enables RAT display. A NO value

disables RAT display. Installing an RAT sensor will allow

economizer differential dry bulb control. Refer to the economizer

operation for more information.

RH Sensor On OAQ Input (RH.S)

This configuration identifies if a space relative humidity sensor is

installed on the outdoor air quality (OAQ) input. A YES value

enables SP.RH display. If a Humdi-MiZer unit, then the unit

determines dehumidification demand based on this input and the

appropriate set point. A NO value disables SP.RH display and use.

Space Humidity Switch (RH.SW)

This configuration identifies if a space relative humidity switch is

installed on the ENTHALPY input, and what status (normally

open, normally closed) the input is when the space humidity is

HIGH.

Temperature Compensated Start Cooling Factor

(TCS.C)

This factor is used in the equation of the Temperature

Compensated Start Time Bias for cooling. A setting of 0 minutes

indicates Temperature Compensated Start in Cooling is not

permitted.

Temperature Compensated Start Heating Factor

(TCS.H)

This factor is used in the equation of the Temperature

Compensated Start Time Bias for heating. A setting of 0 minutes

indicates Temperature Compensated Start in Heating is not

permitted.

Modes

The ComfortLink controls operate under a hierarchy of command

structure as defined by four main elements: the System Mode, the

HVAC Mode, the Occupied status, 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 status affects set points for cooling and heating in

Space Sensor control mode and operation of the economizer for

indoor air quality ventilation and free cooling.

The Unit Control Type (ConfigurationUNITU.CTL) defines

if temperature control is based on thermostat inputs or space

temperature sensor input.

The general operating mode of the control and the status of some

related operation lockouts are located on the display at two

locations: Run Status MODE and Operating Modes MODE.

ComfortLINK v2.X

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