Carrier PrimeLINE 69NT40-561-200 Operation And Service Manual page 67

CODE TITLE
Cd29 Failure Action (Mode)
Cd30 In-Range Tolerance
Cd31 Stagger Start Offset
Time (Seconds)
Cd32 Current Limit
peres)
Cd33 Humidity Setpoint
Cd34 Economy Mode (On-
Off)
Table 4–6 Controller Function Codes (Continued)
If all of the control sensors are out of range (alarm code AL26) or there is a probe
circuit calibration failure (alarm code AL27), the unit will enter the shutdown state
defined by this setting. The user selects one of four possible actions as follows:
A - Full Cooling (Compressor is on, economized operation.)
b - Partial Cooling (Compressor is on, standard operation.)
C - Evaporator Fan Only (Evaporator fans on high speed, not applicable with fro-
zen setpoints.)
d - Full System Shutdown - Factory Default (Shut down every component in the
unit.)
The in-range tolerance will determine the temperature band around the setpoint
which will be designated as in-range.
For normal temperature control, control temperature is considered in range if it
is within setpoint in-range Tolerance. There are four possible values:
1 = +/- 0.5°C (+/-0.9°F)
2 = +/- 1.0°C (+/-1.8°F)
3 = +/- 1.5°C (+/-2.7°F)
4 = +/- 2.0°C (+/-3.6°F) - Factory Default
If the control temperature is in-range, the green IN-RANGE light will be illuminat-
ed.
In-range tolerance shall be set to +/- 2.0°C upon activation of dehumidification or
Bulb Mode (Cd33, Cd35, Cd48).
When CCPC is actively controlling, in-range tolerance is not considered.
"-----" will be displayed whenever Dehumidification or Bulb Mode is enabled or
when CCPC with six hour re-activation is actively controlling.
"-----" will be displayed whenever Frozen Economy Mode is operating.
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.
(Am- 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 HUMIDIFICATIONMODE
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 Pre-trip 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.
DESCRIPTION
4–29 T-362