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RT-SVD03G-EN 23

Typical Control Box Layout

Figure 14. Typical Control Box Layout (T/YSC120E, T/YHC092-120E, & WSC120E)

Main Page

Introduction2
Reliatel Introduction2
Why Change2
Table of Contents3
General Information9
Reliatel Vs. Electromechanical9
Reliatel - Module Descriptions9
Module Flow Diagram11
Low Voltage Terminal Strip20
Typical Control Box Layout21
Reliatel Refrigeration Module (RTRM)25
RTRM Diagnostics26
27½ to 50 Ton Unit Additional Diagnostics (VAV Only)33
Default Operations34
Reliatel Option Module (RTOM)36
RTOM Layout36
RTOM Inputs37
Setpoint Potentiometers38
Reliatel Ventilation Module (RTVM)41
RTVM Layout41
RTVM Inputs41
Setpoint Potentiometers42
Reliatel Dehumidification Module (RTDM)43
RTDM Layout43
RTDM Inputs43
Verifying Proper Air Flow44
Units with Direct Drive Indoor Fan with MMC44
Reliatel LED Functions45
Reliatel Refrigeration Module (RTRM)45
Green System LED45
Green Transmit LED45
Yellow Receive LED45
Reliatel Options Module (RTOM)45
Reliatel Ventilation Module (RTVM)45
Reliatel Air Handling Module (RTAM)45
Reliatel Dehumidification Module (RTDM)46
Green System LED46
Economizer Actuator Module (ECA)46
Ignition Control (IGN)46
Green46
TCI COMM3/4 Interface (Tracer, Varitrac)47
Yellow RX (Receive) LED47
Green TX (Transmit) LED47
LCI (Lontalk)47
LED1 Green MODBUS LED47
LED4 Green LCI Status LED47
LED2 Red Service LED47
LED3 Yellow Comm RX47
Reliatel Test Mode48
Protocol of Communications48
Service Test Mode48
Auto-Cycle Test48
Resistance Test49
Step Test49
Test Mode50
Service Tips50
Thermostats and Sensors55
High Temperature Sensor Diagram73
Operation with a Conventional Thermostat (Constant Volume)74
Zone Sensor Module Testing78
Mechanical Zone Sensor Module78
Temperature Input78
Setpoint Input79
Mode Input80
Programmable Zone Sensor BAYSENS119A and BAYSENS019C (Obsolete)81
RTRM/RTOM (Temperature Inputs)83
Outdoor Air Sensor, Discharge Air Sensor, Coil Temperature Sensor83
Zone Sensor Averaging85
COMM3/4 Interface Operation & Troubleshooting86
Wiring86
Led's86
Communication Problems86
Direct Spark Ignition Control (Texas Instruments, 3-10 Ton Units Only)88
Direct Spark Ignition Control (Sequence of Operation, 3-10 Ton Units Only)89
1-Stage Units89
Reliatel Hot Surface Ignition Control (12.5 - 50 Ton 1 Stage, 2 Stage, and Mod- Ulating Gas Heat)90
Ignition Control Module Diagnostics90
Sequence of Operations (1 and 2 Heat Units)91
Heat Pump Demand Defrost93
Defrost Service Test93
Defrost Mode Operation93
Sequence of Operation94
Emergency Heat Operation94
Diagnostic Information94
Independent Circuit Defrost Operation95
Reliatel Economizer Module Layout (Honeywell)96
Reliatel Economizer Layout (RTEM)97
Reliatel Economizer Actuator Layout98
Reliatel Economizer Operation99
Customer Benefit99
VAV Economizer Cooling Operation99
Economizer Operation with Zone Sensor, Programmable Zone Sensor or ICS100
Economizer Operation with Conventional Thermostat (CV Only)100
Barometric Relief100
Power Exhaust101
Economizer Control Methods101
Thermostat Notes101
Economizer Damper Enthalpy Layout103
Economizer Operation Enthalpy Changeover104
Dry Bulb/Reference Point Selections104
Comparative Enthalpy Method104
Reference Enthalpy Method104
Reference Dry Bulb Method105
Internal Calculations105
Reliatel Economizer Operation & Inputs106
Reliatel Economizer Inputs106
Economizer Actuator Module W7340A1004 (Used Prior to 08/1/05)106
Service Tips106
Economizer Actuator Module W7340B1002 (08/01/05 and Later)107
Reliatel Economizer Control Actuator (LED Fault Code Info.)108
Actuator Fault (Honeywell)108
Actuator Fault (RTEM)108
Sensor Faults108
Reliatel Humidity Sensors109
To Test Humidity Sensors109
Space Pressure Control with Statitrac (27.5-50 Tons)111
Description of Function111
Exhaust Fan Control111
Sensor and Setpoint Arbitration111
Space Pressure Zero Function111
Exhaust Damper Output Control111
Failure and Override Modes of Operation112
Electromechanical Economizer Functions113
Electromechanical Economizer Testing114
Electromechanical Mixed Air Sensor114
Service Tips114
Electromechanical Economizer (3 Position Damper)115
Reliatel Control Temporary Operation 3-25 Tons116
Reliatel Supply Air Tempering Control117
Enable Supply Air Tempering117
Sequence of Operation117
Constant Volume Units with Staged Heat117
Variable Air Volume Units117
Discharge Air Sensing with TCI Comm3/4118
3-25 Ton Units118
27.5-50 Tons Units118
CO Sensor Connections119
(Reliatel Units with Demand Controlled Ventilation)119
Demand Controlled Ventilation (DCV)119
RTEM Operation119
RTEM W/ RTRM V8.0 and Later119
RTEM W/ RTRM V7.0 and Earlier121
Honeywell Operation122
Voyager 27.5 - 50 Tons VAV Notes122
Reliatel Ventilation Override124
Dehumidification with Hot Gas Reheat (3-25 Tons)125
Sequence of Events125
Modulating Dehumidification with Hot Gas Reheat (27.5-50 Tons)128
Controls Overview128
Heating/Cooling Changeover131
Low Ambient Mechanical Cooling Operation (3-25 Ton Units)132
Evaporator Defrost Control (EDC) Function132
Reliatel Condenser Fan Control Logic133
12.5 - 25 Ton133
Condenser Fan Sequencing Control133
Odyssey Independent Circuit Heat Pump Condenser Fan Control134
Phase Monitor135
3 - 25 Ton Reliatel Units135
Electromechanical Time Delay Relay136
Time Delay Relay136
Fan "Off" Delay Solid State Timer136
Snubber Circuits137
Transformer Troubleshooting138
High Pressure and Low Pressure Lockout Circuits139
LPC Logic139
LPC Sequence of Operation139
LPC Operation for 27.5-50T Units with Modulating Reheat139
HPC Logic141
HPC Sequence of Operation141
Novar Controls (Sequence of Operation)142
General142
Cooling with an Economizer142
Cooling Without an Economizer142
Economizer Set-Up143
Novar Controls Checkout/Troubleshooting Procedure143
General143
Checkout Procedure143
Voyager Commercial 27½ to 50 Tons CV and VAV146
Overview146
Constant Volume (CV)146
Variable Air Volume (VAV)146
RTRM - Reliatel Refrigeration Module - (Standard)146
RTOM - Reliatel Options Module - (Standard)147
RTAM - Reliatel Air Handler Module - (Standard on VAV)147
ECA - Economizer Actuator - (Optional)147
TCI - Trane Communication Interface - (Optional)147
LCI - Lontalk Communication Interface (Optional)147
IGN - Ignition Control Module (YC* Only)147
Configuration Input148
Supply Duct Static Pressure Control149
Modes of Operation149
VHR Relay151
Troubleshooting Tips152
Application Notes152
BAYSENS021A Setpoint Input152
Remote Setpoint Inputs on RTAM J7153
Outdoor Air Flow Compensation for VAV Units158
Outdoor Airflow Compensation (27½ - 50 Ton VAV Only)158
Set up158
Well ECA158
Operation for RTRM 8.0 and Later with RTEM159
Software Change History160
Index164

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