Occupied Cooling (31) Ð Indicates that the unit is in the Cooling mode to satisfy its Occupied Cooling set point.

Occupied Fan Only (32) Ð Indicates that the unit is main- taining set point by using a mixture of outside and return air only. No mechanical heating or cooling is being used.

Nighttime Free Cooling (33) Ð Indicates that the supply fan is on and using outside air to precool the space served by the unit. Unit must be con®gured for nighttime free cool-

ing ( ). (This mode is enabled by .)

Smoke Pressurization (34) Ð Indicates that the unit is in the Pressurization mode. This mode is issued from the ®re system panel. Refer to Table 15 for the state of the items controlled.

Smoke Evacuation (35) Ð Indicates that the unit is in the Smoke Evacuation mode. This mode is issued from the system panel. Refer to Table 15 for the state of the items controlled.

Smoke Purge (36) Ð Indicates that the unit is in the Smoke Purge mode. This mode is issued from the ®re system panel. Refer to Table 15 for the state of the items controlled.

Fire Shutdown (37) Ð Indicates that the unit is in the Fire Shutdown mode. This mode is issued from the ®re system panel or local smoke detector. Refer to Table 15 for the state of the items controlled.

Quick Test (38) Ð Indicates that the unit is in the Quick Test mode. It allows the user to test all inputs and outputs con- nected to the PIC controller. All control routines are deac- tivated when the unit is in this mode. This mode can only be initiated manually when the supply fan status is OFF. (HOA switch is in OFF position.) In order to reactivate all

the con®gured control routines, press and then press .

Timed Override (39) Ð Indicates that the unit operation has been extended by the user. Unit must be con®gured for

Timed Override schedule and timed override hours ( ).

 

Table 14 Ð Display Codes

 

 

 

FORCE STATES

Display

Description

1Fire mode force

2Internal safety force

3Quick Test/Service tool force

4HSIO/Building Supervisor force

5Remote Building Supervisor force

6Loadshed minimum offtime force

7Data transfer force

8BEST (Building Environmental Systems Translator) force

9Temperature override force

10Loadshed force

 

OPERATING MODES

Display

Description

21Temperature Reset in effect

22Demand Limit in effect

23Unoccupied Heating mode

24Unoccupied Cooling mode

26Optimal Start mode

27Unoccupied mode

29Optimal Stop mode

30Occupied Heating mode

31Occupied Cooling mode

32Occupied Fan Only mode

33Nighttime Free Cooling mode

34Pressurization mode

35Evacuation mode

36Smoke Purge mode

37Fire Shutdown mode

38Quick Test mode

39Timed Override mode

 

ALARMS

Display

Description

60Air quality 1 high limit

61Air quality 2 high limit

62Air quality/constant outside air suspended

63(Not used)

64DX cooling shutdown

65Pressurization

66Evacuation

67Smoke purge

68Fire shutdown

69Service/maintenance required

70Linkage failure

71Space temperature low limit

72Space temperature high limit

73Supply-air temperature low limit

74Supply-air temperature high limit

75Return-air temperature low limit

76Return-air temperature high limit

77Mixed-air temperature low limit

78Mixed-air temperature high limit

79Outside-air temperature low limit

80Outside-air temperature high limit

81Static pressure low limit

82Static pressure high limit

83Relative humidity low limit

84Relative humidity high limit

85Fan status

86Freezestat

87Analog temperature control sensor low limit

88Analog temperature control sensor high limit

89Outside-air relative humidity low limit

90Outside-air relative humidity high limit

91Supply velocity pressure low limit

92Supply velocity pressure high limit

93Return velocity pressure low limit

94Return velocity pressure high limit

95Delta CCFM low limit

96Delta CCFM high limit

97Filter status

98Duct high humidity

CCFM Ð Cfm x 100

79

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Carrier 39L specifications Display Codes, Force States, Display Description, Operating Modes, Alarms

39L specifications

The Carrier 39L is a cutting-edge air conditioning unit designed for both residential and commercial applications, providing exceptional cooling and heating performance. Equipped with advanced technologies, this system ensures optimal climate control while maintaining energy efficiency.

One of the standout features of the Carrier 39L is its inverter technology. This innovation allows the system to adjust its compressor speed based on the ambient temperature, which results in a significant reduction in energy consumption. By operating at varying capacities rather than a fixed output, the 39L can maintain a consistent temperature, enhancing comfort while lowering electricity bills.

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Durability is also a key characteristic of the Carrier 39L. Constructed with high-quality materials and coated with corrosion-resistant treatments, the unit is built to withstand various environmental conditions. This ensures long-lasting performance and reduces the need for frequent maintenance.

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