Carrier 69NT40-511-199, 69NT40-521 manual Variable option 34 is set to F refer to Table

CODE	TITLE	DESCRIPTION
#
		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.

		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
	Defrost Interval	return sensor temperature is less than 10_C, the interval timer countdown begins.
Cd27		The interval timer is reset if the return sensor temperature rises above 25.6_C.
	(Hours)
		(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.
		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
	Temperature Units	and pushing the ENTER key. The factory default value is Celsius units.
Cd28			NOTE
	(_C or _F)
		This function code will display “---------------“ if the Controller configuration
		variable option 34 is set to _F (refer to Table 3-1).
		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
Cd29	Failure Action	selection code:
	(Mode)	A -- Full Cooling (SMV 100%)
		B -- Partial Cooling (SMV 50% open)
		C -- Evaporator Fan Only
		D -- Full System Shutdown -- Factory Default
		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:
Cd30	In-Range Tolerance	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
		The stagger start offset time is the amount of time that the unit will delay at
Cd31	Stagger Start Offset	start-up, thus allowing multiple units to stagger their control initiation when all
	Time (Seconds)	units are powered up together. The eight possible offset values are:
		0 (Factory Default), 3, 6, 9, 12, 15, 18 or 21 seconds

T-268-07 3-8