Table of Contents
6 RT-SVX34F-EN
Economizer Operation Based on Reference
Enthalpy . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Economizer Operation Based on Compara-
tive Enthalpy . . . . . . . . . . . . . . . . . . . . . . . 90
Dehumidification (Modulating Hot Gas Re-
heat) Sequence of Operation
. . . . . . . . . . . 90
Gas Heat Sequence Of Operation . . . . . . . 91
Constant Volume (CV) Unit Fan Operation 91
Variable Air Volume (VAV) Unit Fan Opera-
tion (2 Stage and Modulating Gas Heat) 91
Variable Air Volume (VAV) Unit Fan Opera-
tion (Modulating Gas Heat Only) . . . . . . 92
Ignition Control Module . . . . . . . . . . . . . . 92
High Temperature Limit Operation and Loca-
tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Electric Heat Sequence Of Operation . . . . 92
Constant Volume (CV) . . . . . . . . . . . . . . . 92
Variable Air Volume (VAV) . . . . . . . . . . . 92
Variable Air Volume Applications (Single
Zone VAV) Sequence of Operation
. . . . . . 92
Occupied Cooling Operation . . . . . . . . . . 92
Occupied Heating Operation . . . . . . . . . . 93
Unoccupied Cooling and
Heating Operation . . . . . . . . . . . . . . . . . . 94
Dehumidification Operation . . . . . . . . . . 94
Failure and Overriding Conditions . . . . . 95
Low Pressure Control (LPC) Sequence of Op-
eration (ReliaTel Control)
. . . . . . . . . . . . . . 95
High Pressure Control and Temperature Dis-
charge Limit (ReliaTel Control)
. . . . . . . . . 95
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Fan Belt Adjustment . . . . . . . . . . . . . . . . . . 96
Monthly Maintenance . . . . . . . . . . . . . . . . . 98
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Cooling Season . . . . . . . . . . . . . . . . . . . . 98
Heating Season . . . . . . . . . . . . . . . . . . . . 99
Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . 100
Fall Restraint . . . . . . . . . . . . . . . . . . . . . . . . 100
Refrigeration System . . . . . . . . . . . . . . . . . 101
Refrigerant Evacuation and Charging . 101
Charge Storage . . . . . . . . . . . . . . . . . . . . 101
Compressor Oil . . . . . . . . . . . . . . . . . . . . 101
Compressor Replacements . . . . . . . . . . . 102
Electrical Phasing . . . . . . . . . . . . . . . . . . .102
Precision Suction Restrictor . . . . . . . . . .102
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
System Status/Diagnostics . . . . . . . . . . . .104
Terminal locations . . . . . . . . . . . . . . . . . .104
System Status / Diagnostics checkout proce-
dure (DC volt meter required) . . . . . . . . .104
Diagnostics (CV and SZ VAV Units Only) 105
Diagnostics (VAV only) . . . . . . . . . . . . . .105
Resetting Cooling and Ignition Lockouts 106
Zone Temperature Sensor (ZSM) Service In-
dicator . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
RTRM Zone Sensor Module (ZSM) Tests 107
Programmable & Digital Zone Sensor
Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
ReliaTel Refrigeration Module (RTRM) .108
Economizer Actuator (ECA)
Test Procedures . . . . . . . . . . . . . . . . . . . .108
ReliaTel Air Module (RTAM) Tests . . . . .109
ReliaTel Air Module (RTOM) Tests . . . . .110
Compressor—Blink Codes . . . . . . . . . . . .110
Troubleshooting . . . . . . . . . . . . . . . . . . . . . .111
TR-200 VFD Programming Parameters . .116
Unit Wiring Diagram Numbers . . . . . . . . . . .118
Warranty and Liability Clause . . . . . . . . . . . .122
COMMERCIAL EQUIPMENT - 20 TONS AND
LARGER AND RELATED ACCESSORIES
.122
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