Table 15 Ð State of Items Controlled

MODE

(DISPLAY

RETURN

SUPPLY

OUTDOOR-

RETURN-

EXHAUST

SUPPLY FAN

RETURN

HEAT

ELECTRIC

 

CODE)

FAN

FAN

AIR

AIR

DAMPER

INLET GUIDE

FAN IGV

INTERLOCK

HEAT ALL

 

 

 

 

DAMPER

DAMPER

 

VANES (IGV)

 

RELAY

STAGES

Pressurization

(34)

Off

On

Open

Close

Close

Open to

Close

On

Off

 

 

 

 

 

 

 

Static Pressure

 

 

 

 

 

 

 

 

 

 

Set Point

 

 

 

Purge

(36)

On

On

Open

Close

Open

Open to

Open to

On

Off

 

 

 

 

 

 

 

Static Pressure

D cfm

 

 

 

 

 

 

 

 

 

Set point

 

 

 

Evacuation

(35)

On

Off

Close

Close

Open

Close

Open

Off

Off

Fire Shutdown

(37)

Off

Off

Close

Open

Close

Close

Close

Off

Off

 

 

 

 

 

 

 

 

 

 

 

(Set point) Ð This subfunction displays the current operating system set points.

To view set points, depress , then use the key to display the occupied heat set point. Continue to depress to display all the various system set points. Table 13 shows the order of the various set points.

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(Inputs) Ð The inputs subfunction displays the read-

ings at the various temperature sensors, fan status, static pres- sure sensors, enthalpy switch, and freezestat. It also allows the outside-air temperature sensor, enthalpy switch, return- air relative humidity sensor, outside-air relative hu- midity sensor, and ®lter status to be forced to a user deter- mined value or status. The forced value overrides the value that the control system actually reads. This permits opera- tion in the event of a faulty sensor.

To read a sensor, enter , then scroll to the de-

sired sensor reading using the key. To force an input, see Example 3. Table 13 shows the order of the readouts.

Example 3 Ð Forcing An Input Value

KEYBOARD

DISPLAY

COMMENTS

ENTRY

RESPONSE

 

 

INPUTS

System inputs

 

 

Scroll past:

 

SPT X

Space temperature

 

SAT X

Supply air temperature

 

RT X

Return air temperature

 

MAT X

Mixed air temperature

 

OAT 60

Outside air temperature

 

 

Outside air temperature value

8 0

OAT 80/FORCED

forced to 80. NOTE: Forced

value toggles between value

 

 

 

 

and word forced

 

 

Outside air temperature

 

OAT 60

forced value removed.

 

 

Display no longer ¯ashes

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

(Outputs) Ð The output subfunction displays or

forces the output value percentage of the inlet guide vanes, mixed air damper and heating and cooling valves. It also displays or forces the ON/OFF status of the supply fan and heat interlock relay, displays the status of electric heat stages, and displays optional output status for return fan volume con- trol, analog output temperature control, discrete output tem- perature control, discrete output time clock, and humidi®er stages.

To read a system output value, enter , then scroll

to the desired output using the key. To force a system

output value, see Example 4. Table 13 shows the order of the output values.

Example 4 Ð Forcing An Output Value

KEYBOARD

DISPLAY

COMMENTS

ENTRY

RESPONSE

 

 

OUTPUTS

System Outputs

 

 

Scroll past:

 

IGV X

Inlet guide vanes

 

MIXD X

Mixed air damper

 

HCV X

Heating coil valve

 

CCV X

Cooling coil valve

 

SF OFF

Supply fan off

 

 

Supply fan forced ON.

 

SF ON/FORCED

NOTE: Supply fan forced

 

value toggles between value

 

 

(SF ON) and word FORCED

 

SF OFF

Supply fan forced value re-

 

moved. Display no longer ¯ashes

 

 

HISTORY FUNCTION

Ð Displays the 9 latest alarms generated by the

unit in the order of their occurrence. If 9 alarms are dis- played, the occurrence of a 10th alarm shifts the ®rst alarm off the display.

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Carrier 39L State of Items Controlled, Example 3 Ð Forcing An Input Value, Example 4 Ð Forcing An Output Value

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