Module Assembly And Outputs; C450Ccu Temperature Sensors - Johnson Controls System 450 Series Technical Bulletin

Table 2: C450CCU menu blocks
Screens Description
60-65 Defrost configuration screens
• 60: This is the dEFR configuration menu. Use the screens in this menu to configure the parameters to use in the defrost control.
• 61: Use this screen to configure the duration of the refrigeration-off period of the defrost cycle. This parameter applies to active and
passive defrost modes. Limits: 0min-99 min. The default duration is set to 30min. A value of 0 disables the defrost control feature.
• 62: Use this screen to configure the temperature at which the refrigeration-off period of the defrost cycle terminates. This screen
is not visible if the dTYP parameter is set to PASS. This screen is also not visible if the sensor type for Sn-2 in screen 23 is bin or --.
Limits: 30°F to 90°F or -1°C to 32°C. Default value: 40°F or 4.5°C.
• 63: Use this screen to configure the duration of the drip time period of the defrost cycle. This parameter only applies to active
defrost mode. This screen is not visible if the dTYP parameter in screen 35 is set to PASS. Limits: 0min-10min. The default value is
5min.
• 65a-65h: Use these screens to set start times for a maximum of 8 defrost cycles for a 24 hour period. The times display in either a
12 hr or 24 hr format, depending on the parameter set in the CLK in screen 101. Unused slots are indicated with blinking --:--. Limits:
12hr format: 12:00 AM-11:59 PM, 24hr format: 00:00-23:59. Default values: dF-1: 12:00 AM, dF-2: 04:00 PM, dF-3 to dF-8: --:--.
70-72: Manual defrost configuration screens
70: This is the MdEF configuration screen. Use the screens in this menu to manually start or terminate a defrost cycle. The menu is
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visible only if the dUR parameter in screen 61 is not zero.
71: Use this screen to manually start a defrost. The screen displays INIT when a defrost cycle is not active. Set the INIT value to
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Strt to initiate defrost. You can choose one of the following options: ---- or Strt. The default value is ----. This screen is only visible
depending on the current state of defrost.
72: Use this screen to manually terminate a defrost. The screen displays dSTP if a defrost cycle is active. Set the dSTP value to StOP
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to terminate the defrost cycle. If defrost type is set to Active, this terminates the refrigeration-off period of the cycle and begins the
drip time or fan delay period if applicable. This screen is only visible depending on the current state of defrost. You can choose one
of the following options: ---- or StOP. The default value is ----. If defrost mode is set to active, you can use this screen to stop the drip
time or fan delay periods of the defrost.
80-81 Evaporator fan configuration screens
• 80: This is the EFAN configuration menu. Use this menu to configure the off-mode fan state for the evaporator fans.
• 81: Use this screen to configure off-mode fan state or the desired state of the evaporator fan or fans when the refrigeration output
is off. You can choose from the following options: Single-speed: ON or OFF. Two-speed fan: OFF, HI, or LO. The default value is OFF.
Sn-1 high temperature alarm screens:
90-92
• 90: This is the Alarm menu for the refrigerated space high temperature alarm. The high temperature alarm remains active within
the controller even if an alarm relay is not defined.
• 91: Use this screen to set the high temperature alarm threshold for the refrigerated space temperature sensor Sn-1. The high
temperature alarm does not have an effect on the condensing unit operation. The alarm disables before any part of the defrost
cycle occurs. Limits: -40°F to 90°F or -40°C to 32°C. The Sn-1 alarm auto-resets at 80% of the alarm setpoint.
• 92: On this screen, you can view the Sn-1 high temperature alarm delay. Once a high temperature alarm condition exists, the
controller delays this amount of time before it activates the alarm state. The timer for this alarm does not count down during any
part of a defrost cycle. Limits: 0min-240min. Default value: 30min.
100-102 Clock configuration screens:
• 100: This is the Clock menu. Use the screens in this menu to set the clock format and the time of day.
• 101: On this screen, you can view the time in a 12h or 24h format. You can choose one of the following options: 12h or 24h. Default
value: 12h.
• 102: Use this screen to set the current time of day. Limits: 12h format: 12:00 AM- 11:59 PM, 24h format 00:00 – 23:59.
110-112: Backlight configuration screens:
110: Use this screen to set the brightness levels for the backlight. The backlight comes on at the bKLH level when you press a
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button. When the screen times out, the backlight switches to bKLL level.
111: Use this screen to set the backlight brightness for low level. Limits: OFF or 0 - 10. Default value: 5.
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112: Use this screen to set the backlight brightness for high level. Limits: 1- 10. Default value: 10.
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Module assembly and outputs

The condensing unit control module controls the relay outputs of both the control module and the
expansion modules. For more information about the System 450 modules that you can use in a
control system, see Table 21.

C450CCU temperature sensors

Condensing unit control modules use A99 Series temperature sensors only.
See Table 3 for information about sensor types, the corresponding output setup values and ranges,
sensor models, and transducer models that you can use in condensing unit control systems.
Note: Two A99BB-500C temperature sensors with 5m or 16-3/8 ft cable length are included with
the C450CCU-4C controller. See
pressure transducers.
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Ordering information
System 450 Series C450CCU Condensing Unit Control System Technical Bulletin
for available temperature sensors and