Bedienungsanleitung Carrier 48 50PG C03-14 (Seite 16 von 188) (Englisch)

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HVAC Operation Disabled (HV.DN)

Allow disabling of HVAC mode. This is only available on a

network connection and shows if the unit has been forced into the

disabled status.

Cool Setpoint In Effect (EFF.C)

This shows the actual setpoint that is being used for control during

cooling mode. If a 0 is displayed, then space sensor control is not

being used and the unit is being controlled by a thermostat.

Heat Setpoint In Effect (EFF.H)

This shows the actual setpoint that is being used for control during

heating mode. If a 0 is displayed, then space sensor control is not

being used and the unit is being controlled by a thermostat.

Currently Occupied (OCC)

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 communication “Linkage” is established

between the unit and a linkage source.

Demand Limit in Effect (D.LMT)

Displays if a demand limit has been placed on the unit’s capacity.

Compressor OAT Lockout (C.LOC)

Displays if operation of one or more compressors is prevented due

to outdoor temperature limit lockout.

Heat OAT Lockout (H.LOC)

Displays if heating operation is prevented due to outdoor

temperature limit lockout.

Econo Cool OAT Lockout (E.LOC)

Displays if economizer operation for cooling is prevented due to

outdoor temperature limit lockout.

General Operation

48/50PG and 48/50PM units can provide cooling,

dehumidification, heating, and ventilation operation. Each unit

will operate under one of two basic types of control: thermostat or

space temperature sensor. There are many inputs, configurations,

safety factors, and conditions that ultimately control the unit. Refer

to the specific operation sections for detail on a specific unit

operation.

When thermostat control is enabled (Configuration→UNIT

→U.CTL = 1), the unit will operate based on discrete input

commands (G, Y1, Y2, W1, and W2) and there is a one minute

time delay between modes and when re−entering a mode. The G

command calls for ventilation, the Y1 and Y2 commands call for

cooling, and the W1 and W2 commands call for heating.

Thermostat Control Type (Configuration→UNIT→T.CTL) affects

how cooling operates based on Y1 and Y2 commands and if

cooling/heating stage time guards are applied.

When space temperature sensor control is enabled (Configuration

→UNIT→U.CTL = 2), the unit will try to maintain the Space

Temperature (Temperatures→AIR.T→SPT) between the effective

cool and heat setpoints (Run Status→MODE→EFF.C and

EFF.H). However, to minimize unnecessary cool to heat and heat

to cool changes, there is a 10 minute delay after the last stage turns

off before the control will switch modes and a 1 minute delay when

re−entering the last mode. Linkage operation overrides the mode

changeover delay to 15 seconds. The cooling and heating Mode

Select Timeguard (Operating Modes→COOL→MS.TG and

Operating Modes→HEAT→MS.TG) show the remaining time

before allowing the respective mode to be entered.

Temperature Setpoint Determination

Setpoints are used to control the unit while under space

temperature sensor control. The Cool Setpoint in Effect (EFF.C)

and the Heat Setpoint in Effect (EFF.H) are the points in which the

unit is controlling to at a specific time. These points are read only

points and change according to occupancy, the offset slider status,

and network writes (Linkage or LON).

If the building is in occupied mode, the Occupied Cool Setpoint

(Setpoints→OCSP) and the Occupied Heat Setpoint (Setpoints

→OHSP) are active. When the building is in unoccupied mode,

the Unoccupied Cool Setpoint (Setpoints→UCSP) and the

Unoccupied Heat Setpoint (Setpoints→UHSP) are active. The

heating and cooling set points are also separated by a Heat−Cool

Set Point Gap (Setpoints→GAP) that is user configurable from 2

to 10 degrees F. This parameter will not allow the setpoints to be

set too close together, it will change the last setpoint adjusted if it is

set within the GAP.

When the space sensor has a setpoint slider adjustment, the cool

and heat setpoints (occupied) can be offset by sliding the bar from

one side to the other. The SPT Offset Range (+/−) (Setpoints

→STO.R) sets the total positive or negative degrees that can be

added to the setpoints. With the slider in the middle, no offset is

applied. Moving the slider to the “COOL” side will subtract from

each setpoint, and sliding it to the “WARM” side will add to the

setpoints. The slider offset being applied at any given time is

displayed as Space Temperature Offset (Temperatures→AIR.T

→SPTO).

48/50PG and PM

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