Carrier 30GTN - Page 76

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Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 2

Tab 5c

PC 903 Catalog No. 533-099 Printed in U.S.A. Form 30GTN-1T Pg 76 5-99 Replaces: New

Main Page

Table of Contents1
Major System Components3
General3
Main Base Board (MBB)3
Expansion Valve (EXV) Board3
Compressor Expansion Board (CXB)3
Scrolling Marquee Display3
Energy Management Module (EMM)3
Typical Control Box Overview6
Enable/Off/Remote Contact Switch10
Emergency On/Off Switch10
Cooler Thermistor Locations11
Operating Data11
Sensors14
- T10 - Remote Space Temperature Sensor14
Thermostatic Expansion Valves (TXV)15
Compressor Protection Control System (CPCS) or Control Relay (CR)15
Compressor Current Protection Board15
- (CGF) and Control Relay (CR)15
Electronic Expansion Valve (EXV)16
Energy Management Module16
Capacity Control16
- Minutes Left for Start26
- Minutes off Time26
- Loading Sequence26
- Lead/Lag Determination26
- Capacity Sequence Determination26
- Capacity Control Overrides26
Head Pressure Control27
- COMFORTLINK™ UNITS (with EXV)27
- Units with Txv27
Pumpout27
- Exv Units27
- Txv Units27
Marquee Display Usage29
Service Test29
Conﬁguring and Operating Dual Chiller29
- Control29
Temperature Reset43
Demand Limit45
- DEMAND LIMIT (2-Stage Switch Controlled)45
- Externally Powered Demand Limit45
- DEMAND LIMIT (CCN Loadshed Controlled)45
Troubleshooting46
- Compressor Protection Control System46
- (CPCS) Board46
Compressor Ground Current (CGC) Board46
- B-420A/B)46
EXV Troubleshooting46
- Step 1 − Check Processor Exv Outputs46
- Step 2 - Check Exv Wiring46
- Step 3 - Check Resistance of Exv Motor Windings46
- Step 4 - Check Thermistors that Control Exv46
- Step 5 - Check Operation of the Exv47
Alarms and Alerts47
Alarm and Alert Codes48
Service52
Electronic Components52
Compressors52
- Compressor Removal52
- Oil Charge52
Cooler52
- Cooler Removal52
- Replacing Cooler53
- Servicing the Cooler53
Condenser Coils55
Condenser Fans55
Refrigerant Feed Components56
- Electronic Expansion Valve (Exv)56
- Moisture-Liquid Indicator57
- Filter Drier57
- Liquid Line Solenoid Valve57
- Liquid Line Service Valve57
Thermistors57
- Location57
- Replacing Thermistor T257
- Replacing Thermistors T1,T5,T6,T7, and T858
- Thermistors T3 and T458
- Thermistor/Temperature Sensor Check58
Safety Devices63
- Compressor Protection63
- Low Oil Pressure Protection63
- Crankcase Heaters63
- Cooler Protection63
Relief Devices64
- High-Side Protection64
- Low-Side Protection64
- Pressure Relief Valves64
Other Safeties64
Pre-Start-Up64
System Check64
Start-Up and Operation65
Actual Start-Up65
Operating Limitations65
- Temperatures65
- Voltage65
- Minimum Fluid Loop Volume65
- Flow Rate Requirements65
Operation Sequence66
Appendix A - Ccn Tables67

Carrier 30GTN - Page 76

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