ACCESSORY UNLOADER INSTALLATION
CONTENTS
SAFETY CONSIDERATIONS
040-420
GENERAL
MAJOR SYSTEM COMPONENTS
Table 1 - Unit Sizes and Modular Combinations
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Compressor Protection Control Module CPCS
Table 2 - LOCAL/ENABLE-STOP-CCN
Switch Positions and Operation
Table 3 - Thermistor and Transducer Locations
OPERATION DATA
Table 4A - Capacity
Control Steps,
Table 4A - Capacity Control Steps, 040-070cant
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Table 4A - Capacity Control Steps, 040-070cant
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Table 4D - Capacity Control Steps, 225, 250,280
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JG SEQUENCE
UNIT
LOAC
4G SEQUENCE
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Table 5 - Condenser Fan Sequence
Table 5 - Condenser Fan Sequence cant
Keypad and Display Module Also Called HSIO
Fig. 3 - Keypad and Display Module
Table 6 - Keypad and Display Module Usage
Table 8 - Accessing Functions and Subfunctions
Table 7 - Functions and Subfunctions
Table 9 - Keypad Directory STATUS
Table 9 - Keypad Directory cant STATUS cant
SUBFUNCTION 10 OUTPUTS
TEST
Table 9 - Keypad Directory cant STATUS cant
DISPLAY
Table 9 - Keypad Directory cant TEST cant
SCHEDULE
SERVICE
Table 9 - Keypad Directory SCHEDULE cant
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Table 9 - Keypad Directory cant SERVICE cord
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Table 9 - Keypad Directory cant
SET POINT
Example 1 -Reading Alarm Codes
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Table 10 - Operationat and Mode Display Codes
Example 2 - Reading Current Operating Modes
Example 3 -Using Test Function
Example 4 - Reading and Changing
Chilled Water Set Point
Example 5 -Using Return Water Temperature Reset
Fig. 4 - Cooling Return Water Reset
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Example 6 - Changing Reset Type
Fig. 5 - Cooling External Temperature Reset
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Table 11 -Service Functions
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Fig. 7 - 4-20mA Cooling Temperature Reset
Example 8 - Setting Time of Day and Day of Week
Fig. 8 - 4-20mA
Demand Limiting
Table 12 - Factory Configuration Keystrokes
Table 13 - Adjustable Field Configurations
Example 9 - Using the Schedule Function
Example 9 continued next page
Example 10 - Holiday Schedule Function
Example 9 - Using the Schedule Function cant
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Fig. 9 - Sample Time Schedule
TROUBLESHOOTING
Typical Stoppage Faults and Reset Types
Complete Unit Stoppage - Complete unit stop
Table 14 - Alarm Codes
Possible causes of failure
Code 30 Reset input failure 4 to 20 mA
CPCS
Fig. IOA - 24-VSafety Circuit Wiring
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32MP
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24VAC
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Plug
LEGEND
Low Voltage
Transformer
C G F
Fig. 12 - EXV Cable Connections to
1 Electronic Expansion Valve
Fig. 11 - Electronil c Expansion Valve EXV
EXV Driver Module, DSIO EXV
Circuit A -Thermistor T7, Suction Pressure Trans
ppTT - Suction Pressure Transducer
LEGEND D P T - Discharge Pressure Transducer
Oil Pressure Transducer
T - Thermistor Number
Fig. 15 - Thermistors
Fig. 14 - Thermistor Locations
Circuits A and B, Lead Compressor Only
WATER-SIDETEMPERATURE SENSOR Tl, T2, -ALL UNITS
Fig. 16 - Pressure Transducer
TEMP:;fTURE
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Selector Switch Locations
Control Modules
Fig. 18 - Module Address
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Fig. 19 - Sensor Bus Wiring Communications
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COMM
Fig. 22 - 4 In/4 Out Module SIO
Troubleshooting
Table
ACCESSORY UNLOADER INSTALLATION
Table 18 - Standard and Accessory Unloaders
Installation
13 6 y
Fig. 23 - Accessory Unloader Control Wiring 69
080-110SO/SO Hz and 130 60 Hz
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3.Wire in the solenoid valves
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WIRING
Fig. 26B - Demand Limit - Two External Switch
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Fig. 30 - Remote Reset from 4-20mA Signal
Fig. 27 - Demand Limit - 4-20mA Signal
Externally Powered
Fig. 28 - Demand Limit - 4-20mA Signal
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Installation
Fig. 35 -Remote Alarm
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Copyright 1994 Carrier Corporation
