Carrier 69NT40-541-306 Operation And Service Download

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T-354

4–22

Cd35 Bulb Mode

Bulb mode is a user selectable mode of operation that is an extension of dehu
midification control (Cd33). If dehumidification is set to "Off," code Cd35 will dis
play "Nor" and the user will be unable to change it.

After a dehumidification set point has been selected and entered for code Cd33,
the user may then change code Cd35 to "bulb." After bulb has been selected
and entered, the user may then utilize function codes Cd36 and Cd37 to make
the desired changes.

Cd36

Evaporator
Speed Select

This code is enabled only if in the dehumidification mode (code Cd33) and bulb
mode (Cd35) has been set to "bulb." If these conditions are not met, "alt" will be
displayed (indicating that the evaporator fans will alternate their speed) and the
display cannot be changed.

If a dehumidification set point has been selected along with bulb mode then "alt"
may be selected for alternating speed, "Lo" for low speed evaporator fan only,
or "Hi" for high speed evaporator fan only.

If a setting other than "alt" has been selected and bulb mode is deactivated in
any manner, then selection reverts back to "alt."

Cd37

Defrost Termination
Temperature Setting
(Bulb Mode)

This code, as with function code Cd36, is used in conjunction with bulb mode
and dehumidification. If bulb mode is active, this code allows the user to change
the defrost termination thermostat settings. If bulb mode is deactivated, the
DTS set ting returns to the default.

Cd38

Supply Recorder Sensor
(SRS)

Code Cd38 will display the current secondary supply temperature sensor read-
ing for units configured for four probes. If the unit is configured with a Data-
CORDER, Cd38 will display "

-----

." If the DataCORDER suffers a failure, (AL55)

Cd38 will display the supply recorder sensor reading.

Cd39

Return Recorder
Sensor (RRS)

Code Cd39 will display the current secondary return temperature sensor read-
ing for units configured for four probes. If the unit is configured with a Data-
CORDER, Cd39 will display "

-----

." If the DataCORDER suffers a failure, (AL55)

Cd39 will display the return recorder sensor reading.

Cd40

Container
Identification
Number

Code Cd40 is configured at commissioning to read a valid container identifica-
tion number. The reading will not display alpha characters, only the numeric
portion of the number will display.

Cd41
Cd42

Not Applicable

Scroll Units Only

Cd43 AutoFresh Mode

Code Cd43 is a user selectable mode of operation that allows the opening and
closing of a mechanical air vent door via a stepper motor. These selection
modes are as follows:

OFF - Air makeup vent will remain closed.

User - Allows for manual selection of the setting.

Delay -The opening of the door is based on selected time, return temperature

and flow rate (percent opened).

gASLM - The opening is based percent open and CO2 and O2 selectable limits

(LM). This selection is only active if the unit has a CO2 sensor.

TEST / CAL (CO2 sensor option units only) - The door will fully open and close

to allow the user to inspect its operation. If CAL is selected, the control-
ler will zero calibrate the CO2 sensor input.

If the unit is not configured with AutoFresh, the CD43 will display "----"

Cd44 AutoFresh Values

Code Cd44 will display CO2 and O2 concentrations and limits. If the unit is not
configured for AutoFresh or a CO2 sensor is not installed, CD44 will display "--
--"

Table 4–5 Controller Function Codes (Continued)

CODE

TITLE

DESCRIPTION