Carrier 69NT40-541-505 Operation And Service Manual page 54

Code TITLE
No.
Cd30 In-Range Tolerance
Stagger Start Offset
Cd31
Time (Seconds)
System Current Limit
Cd32
(Amperes)
Cd33 Humidity Setpoint
Cd34 Economy Mode
Cd35 Bulb Mode
T-368
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Table 4–5 Controller Function Codes
The in-range tolerance will determine the band of temperatures around the set
point 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 INRANGE light will be illuminated.
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 startup,
thus allowing multiple units to stagger their control initiation when all units are pow-
ered 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. 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; however, capacity is also reduced.
The five values for 460VAC operation are 15, 17, 19, 21 (Factory Default), 23.
This is the value in percent to which the system will dehumidify or humidify. There
are configuration variables that determine whether dehumidification/humidification
capabilities are installed. In the test mode, the setpoint will be temporarily set to
1%, allowing the test of dehumidification. After 5 minutes, the normal setpoint is
restored. If unit is configured for HUMIDIFICATION MODE then selection of a set-
point greater than 75% will activate humidification, and a setpoint less than or
equal to 75% will activate dehumidification. If the unit is configured for dehumidifi-
cation 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 if CnF50, Enhanced Bulb Mode, is active.)
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 op-
eration 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 de-
sired changes.
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