Carrier 69NT40-561-300, Operation And Service Manual

Page: 63 / 174

4–29 T-365
Cd30 IIn-Range Tolerance The in-range tolerance will determine the temperature band around
the set point which will be designated as in-range. For normal tem-
perature control, control temperature is considered in range if it is with-
in 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
illuminated.
In-range tolerance shall be set to +/- 2.0°C upon activation of dehumid-
ification or bulb mode (Cd33, Cd35, Cd48).
When CCPC is actively controlling, in-range tolerance is not consid-
ered.
“-----“ will be displayed whenever Dehumidification or Bulb mode is en-
abled or when CCPC with six hour re-activation is actively controlling.
“-----“ will be displayed whenever Frozen Economy Mode is operating.
Cd31 Stagger Start Offset Time
(Seconds) The stagger start offset time is the amount of time that the unit will de-
lay at start-up, thus allowing multiple units to stagger their control initi-
ation 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. When desirable, the limit can be lowered. Note, howev-
er, that capacity is also reduced. The five values for 460 VAC opera-
tion are: 15, 17, 19, 21, or 23 amperes. The factory default setting is
21 amperes.
Cd33 Humidity Setpoint This is the value in percent to which the system will dehumidify or hu-
midify. There are configuration variables that determine whether dehu-
midification/humidification capabilities are installed. In the test mode,
the setpoint will be temporarily set to 1%, allowing the test of dehumid-
ification. After 5 minutes, 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
configured for dehumidification only, then the entire setpoint range will
apply to dehumidification. If Pretrip is initiated, this value will be set to
“OFF” automatically.
(Replaced by Cd48 interface if CnF50 Enhanced Bulb Mode Interface
is active.)
Cd34 Economy Mode (On-Off) The current state of the economy mode option, “-----”, On, or Off. CnF22
determines whether economy mode offered. Economy mode is a user
selectable mode of operation provided for power saving purposes.
Table 4–3 Controller Function Codes (Continued)
CODE # TITLE DESCRIPTION