8
OAU-SVX01K-EN
Table of Contents
nance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Cooling Season . . . . . . . . . . . . . . . . . . . . 55
Heating Season . . . . . . . . . . . . . . . . . . . . 55
Condenser Coil Cleaning . . . . . . . . . . . . . 56
. . . . . . . . . . . . . . . . . . . . . . . . . 56
. . . . . . . . . . . . . . . . . . . . . . 58
Superheat and Refrigeration Circuit Data
Non-Heat Pump Units . . . . . . . . . . . . . . . 68
ASHP Units . . . . . . . . . . . . . . . . . . . . . . . . 72
Microprocessor Control . . . . . . . . . . . . . . 76
System Alarms . . . . . . . . . . . . . . . . . . . . . 76
Sensor Failure Alarm Display . . . . . . . . . 76
RTRM Failure Modes . . . . . . . . . . . . . . . . 80
Variable Speed VFD Troubleshooting . . 80
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
. . . . . . . . . . . . . . . . . . . . . 81
Field Installation of Factory-Provided Sensors
82
Attention Startup or Service Technician
Horizon UC600 v11.0 Released . . . . . . . . 86
Documents Included in This Packet: . . . . 86
Unchanged from Previous Versions: . . . 86
Suction Pressure Monitoring . . . . . . . . . 86
Compressor Run Status and Diagnostics 86
Updated Point Names to Match Tracer SC 86
Minimum Supply Air Flow Setpoints . . . 86
Gas Heater Staging Off at Minimum Capacity
86
Reduced Hot Gas Reheat Purge Mode . . 86
Unit Shutdown Due to Condensate Overflow
86
Liquid Line Pressure Setpoint Reset . . . . 86
Hot Water Reheat . . . . . . . . . . . . . . . . . . . .87
Expanded Fallback Control . . . . . . . . . . . .87
. . . . . . . . . . . . . . . . . . .88
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Space Control and Single Zone VAV
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
. . . . . . . . . . . . . . . . . . . . . .88
Starting Sequence . . . . . . . . . . . . . . . . . . .88
Supply Fan Sequence . . . . . . . . . . . . . . . .88
. . . . . . . . . . . . . . . . . . . . .89
. . . . . . . . . . . . . . . . . . . . . .89
Discharge Air Control . . . . . . . . . . . . . . . .89
Multi-Zone VAV Control . . . . . . . . . . . . . .89
Space Control . . . . . . . . . . . . . . . . . . . . . . .89
Single Zone VAV Control . . . . . . . . . . . . . .89
. . . . . . . . . . . . . . . . .89
Discharge Air Control . . . . . . . . . . . . . . . .89
Multi-Zone VAV Control . . . . . . . . . . . . . .89
Gas Heat Ignition Failure . . . . . . . . . . . . . .90
Water Source Heat Pump . . . . . . . . . . . . .90
. . . . . . . . . . . . . . . . . . . . . . . . .90
Discharge Air Control . . . . . . . . . . . . . . . .90