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78 TP-7092 11/22

Figure 66 Specific Gravity Temperature Correction

Correction

Example No. 1

Temperature below 26.7°C (80°F)

Hydrometer Reading 1.250

Acid Temperature - 6.7°C (20°F)

Subtract .024 Specific Gravity

Corrected Specific Gravity is 1.226

1.250 - .024 = 1.226

Example No. 2

Temperature above 26.7°C (80°F)

Hydrometer Reading 1.235

Acid Temperature 37.8°C (100°F)

Add .008 Specific Gravity

Corrected Specific Gravity is 1.243

1.235 + .008 = 1.243

The temperature correction amounts to about .004 (4 points) of

specific gravity for each 5.5°C (10°F) change in temperature.

1-787

Table of Contents3
Safety Precautions and Instructions7
Introduction13
Service Assistance16
Descriptions and Service Views17
Introduction17
Engine17
Alternator17
Generator Set Enclosure17
Transfer Switch17
Controller18
Oncue® Plus Generator Management System20
Accessories20
Cold Weather Package Kit20
Battery Heater Kit20
Breather Tube Heater and Oil Heater Kit21
Fuel Regulator Heater (18 and 20Kw Models Only)22
Oil Pressure Sensor Boot Kit23
Carburetor Heater23
Emergency Stop Kit24
Load Management24
Powersync Automatic Paralleling Module (APM)24
Programmable Interface Module (PIM)25
Service Views26
Generator Set Operation27
Prestart Checklist27
Exercising the Generator Set27
Local Starting and Stopping28
Automatic Operation28
Remote Starting and Stopping28
Remote Emergency Stop Switch28
Engine Start Crank Cycle30
Engine Cooldown30
Automatic Operation with Model RXT Transfer Switch30
Automatic Operation with Other Transfer Switches30
Exercise31
Setting the Exerciser31
Unloaded Cycle Exercise with Complete System Diagnostics32
Unloaded Full-Speed Exercise33
Loaded Full-Speed Exercise (with RXT Only)33
Shutdown During Exercise (Advanced Diagnostic)33
Power Failure During Exercise Cycle33
Faults34
Warnings34
Shutdowns34
Shutdown During Exercise (Advanced Diagnostic)34
ATS Communication Errors34
Resetting the Controller after a Fault Shutdown34
Faults Related to Paralleling37
RDC2 Controller Operation39
RDC2 Generator Set/Transfer Switch Controller39
Control and Indicators39
Controller Keypad40
LED Indicators41
LCD Display41
Controller Power42
Battery Charging42
Changing Settings43
Setting the Exerciser45
Setting the Exerciser at Controller Power-Up45
Changing the Exercise Settings45
RDC2 Controller Menus47
Main Menu47
Overview Menu48
Engine Metering Menu49
Generator Metering Menu50
Generator Set Information Menu51
Genset Run Time Menu51
Genset System Menu52
ATS Status Menu54
ATS Configuration Menu55
Date and Time Menu56
Networking Information Menus56
Networking Status Submenu57
Networking Configuration Submenu (Oncue® Password)58
RBUS Information60
Remote Devices Submenu61
Programmable Interface Module (PIM) Status Menu62
Load Control Menus63
Event Log64
Scheduled Maintenance65
Service Schedule, 14 Kw Models66
Service Schedule, 18 and 20 Kw Models67
Lubrication System68
Low Oil Pressure Shutdown68
Oil Check69
Engine Oil Recommendation69
Oil Change Procedure69
Resetting the Maintenance Timer71
Oil Cooler (18/20RCA/RCAL Only)71
Spark Plugs72
Air Cleaner Service73
Air Cleaner, 14 Kw Models73
Air Cleaner, 18/20 Kw Models74
Cooling System75
Exhaust System75
Battery76
Cleaning the Battery77
Checking Electrolyte Level77
Checking Specific Gravity77
Storage Procedure79
Lubricating System79
Fuel System79
Cylinder Lubrication79
Exterior Preparation79
Battery79
Troubleshooting81
Introduction81
Fault Messages81
Circuit Protection81
Controller Internal Circuit Protection81
Line Circuit Breaker81
USB Port and Auxiliary Winding Mini-Breaker81
Stop Switches82
Thermostat82
Troubleshooting84
Appendix A. Abbreviations85

Brand	Kohler
Model	20RCAL
Category	Portable Generator
Language	English

Kohler 20RCAL User Manual

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