Table of Contents
OAU-SVX006E-EN
7
Safety Controls . . . . . . . . . . . . . . . . . . . . . 57
. . . . . . . . . . . . . . . . . . . . . . . . . Maintenance
. . . . . . . . . . . . . . . . . 58
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Cooling Season . . . . . . . . . . . . . . . . . . . . 58
Heating Season . . . . . . . . . . . . . . . . . . . . 58
Condenser Coil Cleaning . . . . . . . . . . . . . 58
. . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Microprocessor Control . . . . . . . . . . . . . . 68
System Alarms . . . . . . . . . . . . . . . . . . . . . 68
Sensor Failure Alarm Display . . . . . . . . . 68
RTRM Failure Modes . . . . . . . . . . . . . . . . 72
Condenser Fan VFD Troubleshooting . . 72
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
. . . . . . . . . . . . . . . . . . . . . 73
Attention Startup or Service Technician
Horizon UC600 v11.0 Released . . . . . . . . 78
Documents Included in This Packet: . . . . 78
Unchanged from Previous Versions: . . . 78
Suction Pressure Monitoring . . . . . . . . . 78
Compressor Run Status and Diagnostics 78
Updated Point Names to Match Tracer SC 78
Minimum Supply Air Flow Setpoints . . . 78
Gas Heater Staging Off at Minimum Capacity
78
Reduced Hot Gas Reheat Purge Mode . . 78
Unit Shutdown Due to Condensate Overflow
78
Liquid Line Pressure Setpoint Reset . . . . 78
Discharge Air Temp. Reset for Single Zone
VAV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Hot Water Reheat . . . . . . . . . . . . . . . . . . . .79
Expanded Fallback Control . . . . . . . . . . . .79
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Space Control and Single Zone VAV Control
80
. . . . . . . . . . . . . . . . . . . . . .80
Starting Sequence . . . . . . . . . . . . . . . . . . .80
Supply Fan Sequence . . . . . . . . . . . . . . . .80
. . . . . . . . . . . . . . . . . . . . .81
. . . . . . . . . . . . . . . . . . . . . .81
Discharge Air Control . . . . . . . . . . . . . . . .81
Space Control . . . . . . . . . . . . . . . . . . . . . . .81
Single Zone VAV Control . . . . . . . . . . . . . .81
. . . . . . . . . . . . . . . . .81
Discharge Air Control . . . . . . . . . . . . . . . .81
Multi-Zone VAV Control . . . . . . . . . . . . . .81
Gas Heat Ignition Failure . . . . . . . . . . . . . .82
Water Source Heat Pump . . . . . . . . . . . . .82
. . . . . . . . . . . . . . . . . . . . . . . . .82
Discharge Air Control . . . . . . . . . . . . . . . .82
Multi-Zone VAV Control . . . . . . . . . . . . . .82
Compressor Low Ambient Lockout . . . . .83
Evaporator Frost Protection . . . . . . . . . . .83