Carrier Transicold 69NT40-561-001 Operation And Service Manual page 64

Code Title
Cd31 Stagger Start Offset
Time (Seconds)
Cd32 Current Limit
(Amperes)
Cd33 Humidity Setpoint
Cd34 Economy Mode (On-
Off)
Cd35 Bulb Mode
Cd36 Evaporator Fan
Speed Select
Cd37 Variable DTT Setting
(Bulb Mode)
T-340
Table 4–5 Controller Function Codes
Description
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.
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. When de-
sirable, the limit can be lowered. Note, however, that capacity is also reduced.
The five values for 460 VAC operation are: 15, 17, 19, 21, or 23 amperes. The
factory default setting is 21 amperes.
This is the value in percent to which the system will dehumidify or humidify.
There are configuration variables that determine whether dehumidification/hu-
midification capabilities are installed. In the test mode, the setpoint will be tem-
porarily set to 1%, allowing the test of dehumidification. After 5minutes, the
normal setpoint is restored. If unit is configured for HUMIDIFICATION MODE
then selection of a setpoint greater than 75% will activate humidification, and a
setpoint less than or equal to 75% will activate dehumidification. If the unit is con-
figured for dehumidification only, then the entire setpoint range will apply to de-
humidification. If Pretrip is initiated, this value will be set to "OFF" automatically.
(Replaced by Cd48 interface if CnF50 Enhanced Bulb Mode Interface is active.)
The current state of the economy mode option, "-----", On, or Off. CnF22 deter-
mines whether economy mode offered. Economy mode is a user selectable
mode of operation provided for power saving purposes.
The current state of the bulb mode option, "-----", nOr, or bULb.
(Replaced by Cd48 if CnF50, Enhanced Bulb Mode, is active.)
Bulb mode is an extension of dehumidification control (Cd33). If dehumidification
(CnF04) is set to "Off," Cd35 will display "Nor" and the user will be unable to
change it. CnF28 determines whether the bulb mode selection is offered.
After a dehumidification set point has been selected and entered for code Cd33,
the user may then change Cd35 to "bulb." After Bulb Mode has been selected
and entered, the user may then utilize function codes Cd36 and Cd37 to make
the desired changes.
This is the desired evaporator fan speed for use during the bulb Dehumidification
and Humidification mode option.
(Replaced by Cd48 if CnF50, Enhanced Bulb Mode, is active.)
This code is enabled only if in the dehumidification mode (Cd33) and bulb mode
(Cd35) has been set to "bulb." If these conditions are not met, "alt" will be dis-
played (indicating that the evaporator fans will alternate their speed) and the dis-
play 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."
This is the variable defrost termination thermostat setting to be used with the op-
tional bulb mode functionality. This item is only displayed if the bulb mode option
is configured on.
(Replaced by Cd48 interface if CnF50 Enhanced Bulb Mode Interface is active.)
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