Carrier 69NT40-511-199 - Manual (Page 46)

3-8 T-268-07
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DESCRIPTION TITLE
Inapplicable Functions Display ----------
Display Only Functions
NOTE
Function codes Cd27 through Cd37 are user-selectable functions. The operator can change the value of
these functions to meet the operational needs of the container.
Cd27 Defrost Interval
(Hours)
The defrost interval is the time interval between defrost cycles. Five selectable
values are available: 3, 6, 9, 12 or 24 hours. The factory default value is 12 hours.
The time interval of the first defrost will not begin counting down until defrost
termination sensor (DTS) is below 10_C (50_F). The time interval to the next
defrost cycle is entered into the Controller at the time DTS is below 10_C (50_F)
or at power-up. (See code Cd37 for deviations.) If DTS reaches 25.6_C (78_F) at
any time during the timer count down, the interval is reset and the countdown
begins over. If DTS has failed (i.e., alarm code AL60 is active) and the primary
return sensor temperature is less than 10_C, the interval timer countdown begins.
The interval timer is reset if the return sensor temperature rises above 25.6_C.
(See section 4.4.6.)
Defrost Interval Timer Value Option: If the software is configured to “ON” for this
option, then the value of the defrost interval timer will be saved at power down
and restored at power up. This option prevents short power interruptions from
resetting an almost expired defrost interval, and possibly delaying a needed
defrost cycle.
NOTE
The defrost interval timer counts only during compressor run time.
Cd28 Temperature Units
(_C or _F)
This code determines the temperature units (_C or _F) which will be used for all
temperature displays. The user selects _C or _F by selecting function code Cd28
and pushing the ENTER key. The factory default value is Celsius units.
NOTE
This function code will display “--- --- --- --- ---“ if the Controller configuration
variable option 34 is set to _F (refer to Table 3-1).
Cd29 Failure Action
(Mode)
If all of the control sensors are out of range (alarm code AL26) or there is an
alarm code AL27 failure, the unit will enter the shutdown state defined by the
failure action. The user selects one of four possible actions as designated by a
selection code:
A -- Full Cooling (SMV 100%)
B -- Partial Cooling (SMV 50% open)
C -- Evaporator Fan Only
D -- Full System Shutdown -- Factory Default
Cd30 In-Range Tolerance
The in-range tolerance will determine the band of temperatures around the set
point which will be designated as in-range. If the control temperature is in-range,
the in-range light will be illuminated. 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
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