Carrier 69NT40-511-1 Operating And Service Manual page 47

CODE
TITLE
#
Current Limit
Cd32
(Amperes)
Dehumidification
Control (% RH)
Cd33
(Optional)
Economy Mode
Cd34
(On--Off) (Optional)
Bulb Mode
(Normal--Bulb)
Cd35
(Optional)
Evaporator Speed
Select
Cd36
(Cd35 must be in
"Bulb")
Defrost Temperature
Cd37 Sensor Setting
(Optional)
In the unlikely event that AL55 activates, Function Codes Cd38 and Cd39 will display SRS and RRS,
respectively.
Secondary Supply
Air Temperature
Cd38
(Optional)
Inapplicable Functions Display - -- -- -- -- -
The current limit is the maximum current demand allowed on any phase at any
time. Limiting the unit's current (amperage) reduces the load on the main power
and lowers the compressor discharge pressure. When desirable, the limit can be
lowered. Note, however, that capacity is also reduced. The five values for 460vac
operation are:
15, 17, 19, 21 (Factory Default), 23
This code is only applicable to units with a humidity sensor (HS).Relative humidity
set point is available only on units configured for dehumidification. When the
mode is activated, the control probe LED flashes on and off every second to alert
the user. If not configured, the mode is permanently deactivated and Cd33 will
display "----------." When set point is available, it can be set to "OFF." "TEST," or 65
to 95% relative humidity in increments of 1%. If bulb mode is active (code Cd35)
and "Lo" speed evaporator motors are selected (code Cd36) then set point
ranges from 60 to 95%. When "TEST" is selected or test set point is entered, the
heaters should be turned on, indicating that dehumidification mode is activated.
After a period of five minutes has elapsed in this mode, the previously selected
mode is reinstated.
Economy mode is a user selectable mode of operation provided for power saving
purposes. Refer to sections 3.1.7.1 and 3.1.7.2 for a more detailed description of
economy mode.
Bulb mode is a user selectable mode of operation that is an extension of normal
dehumidification. If dehumidification is set to "Off," code Cd35 will display "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.
This code is enabled only if a dehumidification set point has been selected using
function code Cd33 and "bulb" has been selected using function code Cd35. If
these conditions are not met, "alt" will be displayed indicating that the evaporator
fans will alternate their speed whenever a dehumidification set point is selected.
This display cannot be changed by the user. 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."
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
temperature above which the defrost termination sensor (DTS) temperature must
go to terminate defrost. It allows the user to change the setting from 4_C to
25.6_C in 0.1_C (0.2_F) increments. This value is changed using the UP/DOWN
ARROW keys, followed by the ENTER key when the desired value is displayed. If
bulb mode is deactivated in any manner, the DTS setting above which defrost
terminates defaults to the normal 25.6_C (78_F) setting.
NOTE
This code is only applicable to units without a DataCORDER that are configured
to have four probes. If this is true, it will then display the current secondary supply
air temperature.If the unit is configured with a DataCORDER, the Controller
function code Cd38 will display "----------." and the display values for SRS will
appear on the DataCORDER function code dC1.
3-9
DESCRIPTION
T-268-07