3-15
T-292
Table 3-5 Controller Function Codes (Sheet 3 of 3)
Cd31 Stagger Start Offset
Time (Seconds)
The stagger start offset time is the amount of time that the unit will delay at start-
up, thus allowing multiple units to stagger their control initiation when all units are
powered up together. The eight possible offset values are:
0 (Factory Default), 3, 6, 9, 12, 15, 18 or 21 seconds
Cd32 Current Limit
(Amperes)
The current limit is the maximum current draw allowed on any phase at any time.
Limiting the unit’s current reduces the load on the main power supply. This is ac-
complished by reducing the SMV position until current draw is reduced to the set
point. 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
Cd33
Perishable Mode
Dehumidification
Control (% RH)
Relative humidity set point is available only on units configured for dehumidifica-
tion. 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 “
-- -- -- -- --
” will display. The value can be set to “OFF.” “TEST,” or a range of
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
heat LED should illuminate, indicating that dehumidification mode is activated.
After a period of five minutes in the “TEST” mode has elapsed, the previously
selected mode is reinstated.
Cd34 Economy Mode
(On--Off)
Economy mode is a user selectable mode of operation provided for power saving
purposes.
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
temperature above which defrost will terminate. It allows the user to change the
setting within a range of 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, the DTS setting re-
turns to the default.
Display Only Functions -- Continued
Cd38 Secondary Supply
Temperature Sensor
Code Cd38 will display the current secondary supply temperature sensor reading
for units configured for four probes. If the unit is configured with a DataCORDER,
Cd38 will display “
-- -- -- -- --
.” If the DataCORDER suffers a failure, (AL55) Cd38
will display the supply recorder sensor reading.
Cd39 Secondary Return
Temperature Sensor
Code Cd39 will display the current secondary return temperature sensor reading
for units configured for four probes. If the unit is configured with a DataCORDER,
Cd39 will display “
-- -- -- -- --
.” If the DataCORDER suffers a failure, (AL55) Cd39
will display the return recorder sensor reading.
Cd40 Container Identifica-
tion Number
Code Cd40 is configured at commissioning to read a valid container identification
number. The reading will not display alpha characters, only the numeric portion of
the number will display.
Cd41 Valve Override
SERVICE FUNCTION:
This code is used for troubleshooting and allows manual
positioning of the economizer, unloader, suction modulation and oil return valves.
Refer to paragraph 6.17 for operating instructions.
Cd42 Oil Return Valve
The status of the valve is displayed (Open - Closed).
Cd45 Fresh Air Vent
Position Sensor
The fresh air flow (CMH/CFM) is displayed. Unless AL50 is active or CnF47 is
OFF. This function code will automatically activate for 30 seconds and display
when a vent position change occurs.
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