Trane ReliaTel User manual

ReliaTel™
Microprocessor Controls
November 2010 RT-SVD03G-EN
Diagnostic Manual

© 2010 Trane All rights reserved RT-SVD03G-EN
Introduction
3 to 10 ton Convertible and 12½ to 50 ton Dedicated Packaged Rooftops
3 to 10 ton cooling only and gas electric convertible packaged units can be built with either
electromechanical or ReliaTel™ controls. 12½ to 50 ton units are built with ReliaTel controls only.
All Heat pumps are built exclusively with ReliaTel controls. This publication covers both
electromechanical and ReliaTel controls. Due to the more complex application and service
opportunities, greater emphasis is placed on units with ReliaTel controls.
This publication does not cover all aspects of service. It assumes that the service person is an
experiencedcommercial servicetechnician withastrong backgroundin electricalcontrolsandDC
circuits. If you are not experienced and fully qualified in HVAC service, do not attempt to use this
manualtoserviceequipment.Doingsocouldcausepersonalinjurytoyourselforothersandcould
result in expensive equipment or property damage.
ReliaTel Introduction
ReliaTel is not the name of a circuit board, but rather an overall communicating control system
consisting of up to eight communicating modules.
ReliaTel is the name given to the second generation microprocessor controls developed by Trane.
ReliaTelcontrolswerefirst usedinthe3-10tonconvertiblepackagedcoolingwithelectricheat,gas
electric, and heat pumps. ReliaTel has been added to other commercial products as well. In April
2003, 12½-25 ton dedicated units were converted to ReliaTel controls. In April 2004, ReliaTel
controls were added to 27½ to 50 ton dedicated units
Why change?
The Micro has proven itself to our customers in thousands of applications around the world. A
microprocessor based unit provides superior comfort, unmatched reliability and much greater
flexibility than conventional systems. ReliaTel has even more flexibility, is more compact, has
additional system reliability enhancements and more.
Muchof whatReliaTeldoeswill bevery familiar to service technicians accustomed to the previous
generation Micro. Testing and troubleshooting is similar, and in many cases the same. There are,
however, some significant differences, so it is important that the service person use the correct
material for the unit being serviced.

Table of Contents
RT-SVD03G-EN 3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3 to 10 ton Convertible and 12½ to 50 ton Dedicated Packaged Rooftops 2
ReliaTel Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Why change? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ReliaTel vs. Electromechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ReliaTel – Module Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Module Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Low Voltage Terminal Strip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Typical Control Box Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
ReliaTel Refrigeration Module (RTRM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
RTRM Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
27½ to 50 Ton Unit Additional Diagnostics (VAV only) . . . . . . . . . . . . . . . . . 33
Default Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
ReliaTel Option Module (RTOM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
RTOM Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
RTOM Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Setpoint Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
ReliaTel Ventilation Module (RTVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
RTVM Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
RTVM Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Setpoint Potentiometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
ReliaTel Dehumidification Module (RTDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
RTDM Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
RTDM Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Verifying Proper Air Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Units with Direct Drive Indoor Fan with MMC . . . . . . . . . . . . . . . . . . . . . . . . . 44
ReliaTel LED Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ReliaTel Refrigeration Module (RTRM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Green System LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Green Transmit LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Yellow Receive LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ReliaTel Options Module (RTOM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Green system LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ReliaTel Ventilation Module (RTVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Green system LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

4RT-SVD03G-EN
ReliaTel Air Handling Module (RTAM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Green system LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
ReliaTel Dehumidification Module (RTDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Green system LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Economizer Actuator Module (ECA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Green system LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Ignition Control (IGN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
TCI COMM3/4 Interface (Tracer, VariTrac) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Yellow RX (Receive) LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Green TX (Transmit) LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
LCI (LonTalk) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
LED1 Green MODBUS LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
LED4 Green LCI status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
LED2 Red Service LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
LED3 Yellow Comm RX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
ReliaTel Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Protocol of Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Auto-Cycle Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Resistance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Step Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Service Tips: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Thermostats and Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
High Temperature sensor Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Operation with a Conventional Thermostat (Constant Volume) . . . . . . . . . . . . 74
Zone Sensor Module Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Mechanical Zone Sensor Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Temperature input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Setpoint input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Mode Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Programmable Zone Sensor BAYSENS119A
and BAYSENS019C (Obsolete) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
RTRM/RTOM (Temperature Inputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Outdoor Air Sensor, Discharge Air Sensor, Coil Temperature Sensor . . 83
Zone Sensor Averaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
COMM3/4 Interface Operation & Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 86
Wiring: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

RT-SVD03G-EN 5
LED’s: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Communication problems: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
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 units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
2-stage units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
ReliaTel Hot Surface Ignition Control (12.5 - 50 Ton 1 Stage, 2 Stage, and Mod-
ulating Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Ignition Control Module Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Sequence of Operations (1 and 2 heat units) . . . . . . . . . . . . . . . . . . . . . . 91
Heat Pump Demand Defrost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Defrost Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Defrost Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Emergency Heat Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Diagnostic Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Independent Circuit Defrost Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
ReliaTel Economizer Module Layout (Honeywell) . . . . . . . . . . . . . . . . . . . . . . . . . 96
ReliaTel Economizer Layout (RTEM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
ReliaTel Economizer Actuator Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
ReliaTel Economizer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Customer Benefit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
VAV Economizer Cooling Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Economizer Operation with Zone Sensor,
Programmable Zone Sensor or ICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Economizer Operation with Conventional Thermostat (CV only) . . . . . . . . 100
Barometric Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Economizer Control Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Thermostat Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Economizer Damper Enthalpy Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Economizer Operation Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Dry bulb/Reference Point Selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Comparative Enthalpy Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Reference Enthalpy Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Reference Dry Bulb Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Internal Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
ReliaTel Economizer Operation & Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

6RT-SVD03G-EN
ReliaTel Economizer Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Economizer Actuator Module W7340A1004 (used prior to 08/1/05) . . . 106
Service Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
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 Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
ReliaTel Humidity Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
To Test Humidity Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Space Pressure Control with Statitrac (27.5-50 Tons) . . . . . . . . . . . . . . . . . . . . . 111
Description of Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Exhaust Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Sensor and Setpoint Arbitration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Space Pressure Zero Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Exhaust Damper Output Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Failure and Override Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . 112
Electromechanical Economizer Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Electromechanical Economizer Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Electromechanical Mixed Air Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Service Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Electromechanical Economizer (3 Position Damper) . . . . . . . . . . . . . . . . . . . . . 115
ReliaTel Control Temporary Operation 3-25 tons . . . . . . . . . . . . . . . . . . . . . . . . 116
ReliaTel Supply Air Tempering Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Enable Supply Air Tempering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Constant Volume Units with Staged Heat . . . . . . . . . . . . . . . . . . . . . . . . 117
Variable Air Volume Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Discharge Air Sensing with TCI Comm3/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
3-25 Ton Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
27.5-50 Tons units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
CO2 Sensor Connections
(ReliaTel Units with Demand Controlled Ventilation) . . . . . . . . . . . . . . . . . . . . . 119
Demand Controlled Ventilation (DCV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
RTEM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
RTEM w/ RTRM v8.0 and Later . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
RTEM w/ RTRM v7.0 and Earlier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Honeywell Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Voyager 27.5 - 50 tons VAV Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

RT-SVD03G-EN 7
ReliaTel Ventilation Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Dehumidification with Hot Gas Reheat (3-25 Tons) . . . . . . . . . . . . . . . . . . . . . . 125
Sequence of Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Modulating Dehumidification with Hot Gas Reheat (27.5-50 Tons) . . . . . . . . 128
Controls Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Heating/Cooling Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Low Ambient Mechanical Cooling Operation (3-25 Ton Units) . . . . . . . . . . . . 132
Evaporator Defrost Control (EDC) Function . . . . . . . . . . . . . . . . . . . . . . 132
ReliaTel Condenser Fan Control Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
12.5 – 25 Ton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
27.5 – 50 Ton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Condenser Fan Sequencing Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Odyssey Independent Circuit Heat Pump Condenser Fan Control . . . . . . . 134
Phase Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
3 – 25 Ton ReliaTel Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Electromechanical Time Delay Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Time Delay Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Fan “Off” Delay Solid State Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Snubber Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Transformer Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Transformer Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
High Pressure and Low Pressure Lockout Circuits . . . . . . . . . . . . . . . . . . . . . . . 139
LPC Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
LPC Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
LPC Operation for 27.5-50T Units with Modulating Reheat . . . . . . . . . . 139
HPC Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
HPC Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Novar Controls (Sequence of Operation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Novar Controls Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Cooling with an Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Cooling without an Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Economizer Set-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Novar Controls Checkout/Troubleshooting Procedure . . . . . . . . . . . . . . . . 143
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Checkout Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Voyager Commercial 27½ to 50 Tons CV and VAV . . . . . . . . . . . . . . . . . . . . . . . 146

8RT-SVD03G-EN
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
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 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Supply Duct Static Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
VHR Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
BAYSENS021A Setpoint Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Remote Setpoint Inputs on RTAM J7: . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Outdoor Air Flow Compensation for VAV Units . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Outdoor Airflow Compensation (27½ - 50 Ton VAV only) . . . . . . . . . . . 158
Set up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Operation for RTRM 7.0 and Earlier with RTEM or Any RTRM with Honey-
well ECA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Operation for RTRM 8.0 and Later with RTEM . . . . . . . . . . . . . . . . . . . . 159
Software Change History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

RT-SVD03G-EN 9
General Information
ReliaTel vs. Electromechanical
Three to ten ton convertible packaged gas/electric (YSC, YHC) and cooling only (TSC, THC) are
available without microprocessor controls. With electromechanical controls, zone sensors cannot
control the units, nor can building automation systems communicate with it. Electromechanical
units require the use of a thermostat or relay based control system to directly control relays,
contactors,etc.The ignitioncontroland economizerare differentthan theonesused withReliaTel.
Service information for these components are handled separately in this book.
•ReliaTel Controls: 9th digit “R”
•Electromechanical Controls: 9th digit “E”
•27.5-50 Ton: ReliaTel controls 10th digit “M” or greater.
ReliaTel – Module Descriptions
Each ReliaTel Module is a communicating control.
ReliaTel Refrigeration Module (RTRM)
EveryReliaTelunitusesanRTRM.TheRTRMprovidesprimaryunitcontrolforheatingandcooling.
In addition, it has built-in logic that controls heating and cooling staging, minimum run times,
diagnostics, heat pump defrost control, short cycle timing and more. It can be controlled directly
by any of the following:
• Zone Sensor Module (BAYSENS006-11B, AYSTAT661-664B).
• Programmable Zone Sensor (BAYSENS019*, 20*, AYSTAT666*).
• Conventional Thermostat (such as BAYSTAT036-038A, ASYSTAT701-703).
Note: UnlikethepreviousMicro,aconventionalthermostatdoesnotrequireanysortofinterface.
It can be wired directly to the RTRM.
In addition, the unit can be controlled using Trane® ICS systems by applying the appropriate
interface. The RTRM is configured through the unit wiring harness. The same module is used on
gas/electric, cooling only with electric heat, and heat pumps. The following additional inputs are
connected to the RTRM:
• Outdoor Air Sensor (OAS).
• Coil Temperature Sensor (CTS) heat pump only.
• Smoke detector (unless it is factory installed) or other shutdown device.
ReliaTel Option Module (RTOM)
The RTOM gets power from and communicates with the RTRM.
Any of these optional ReliaTel devices require the use of an RTOM:
• Frostat (FOS).
• Clogged Filter Switch (CFS).
• Fan Failure Switch (FFS).
• Discharge Air Sensor (DAS) used for supply air tempering and ICS input data.
• Smoke Detector, Factory Installed (A factory-installed Smoke Detector provides instant
shutdown and ICS alarm output.)
Note: On 27.5-50 Ton Units RTOM is standard.

10 RT-SVD03G-EN
General Information
Reliatel Ventilation Module (RTVM)
TheRTVMisamodulerequiredforunitsconfiguredwithSpacePressureControlwithStatitrac.The
modulecontrolstheExhaustDamperPosition0-10VdcoutputaswellastheSpacePressureSensor
calibration routine. The module accepts the following inputs:
• Statitrac Configuration.
• Space Pressure Input.
• Space Pressure Setpoint.
• Space Pressure Setpoint Deadband.
Reliatel Dehumidification Module (RTDM)
The RTDM is a module required for units configured with Modulating Dehumidification. The
module controls Modulating Cooling and Reheat valves as well as the Reheat Circuit Pumpout
Solenoid. The module accepts the following inputs:
• Reheat Circuit Entering Evaporator Temperature.
• Reheat Circuit Low Pressure Cutout Input.
Economizer Actuator w/ Module (ECA or RTEM)
The economizer can be used with or without the Options module. The actuator has a detachable
communicating module, which can be replaced separately. The outdoor air sensor, connected to
the RTRM, provides outdoor temperature information for the changeover decision.
The ECA accepts the following inputs:
• Mixed Air Sensor (MAS).
• Return Air Sensor (RAS) for comparative enthalpy or ICS input data.
• Outdoor Humidity Sensor (OHS) for reference or comparative enthalpy.
• Return Air Humidity Sensor (RHS) for comparative enthalpy.
•CO
2Sensor 0-10VDC input.
• Remote Minimum Potentiometer (RMP).
• Active/Passive DCV Configuration Input (RTEM only).
• The Power Exhaust relay is connected to the ECA module as well.
COMM3/4 Communication Interface
Allows ICS communication between a ReliaTel unit and Trane ICS systems as follows:
• Tracer™ 100 series
• Tracer™ Summit
•Tracker™
•ComforTrac™
• VariTrac™ 1 (Comfort Manager)
• VariTrac™ 2 (Central Control Panel)
LonTalk® Communication Interface
Allows Building Management System (BMS) communication to a ReliaTel unit. There are 2 LCI
versions, one for SCC control (constant volume units) and one for DAC control (VAV units).

RT-SVD03G-EN 11
Module Flow Diagram
Figure 1. TSC/THC Refrigeration Module (RTRM) Electric Heat/No Heat
LED or indications
TS/H Refrigeration Module
4 Zone Sensor Inputs (AIP)
4 Outputs
Non Heat Pump Config (BIP)
1 Compressor Config (BIP)
1 Stage Heat Config (BIP)
4 Thermostat inputs (BIP)
3 to 7 wire Communicating ZSM
Indoor Fan Output (BOP)
MODBUS Communication
Compressor 1 Output (BOP)
Compressor 1 Proving (BIP)
Compressor 1 Disable (BIP)
Emergency Stop (BIP)
Electric Heat 1st Stage
Electric Heat 2nd Stage
Service Test input (BIP)
Outdoor Air Temp (AIP)
LEDs: System TX, RX
24 VAC
Power
Sensor
Resistor
Electric
Heat 2
Electric
Heat 1
CC1
IDF
Unit Control, Select one
Zone Sensor
Mechanical
Thermostat
G Y1 Y2 W1
R C/B
Zone Sensor
Programmable
COMM 3/4
Communication
Interface
Options
Module
Economizer
Module
w/Actuator

12 RT-SVD03G-EN
Module Flow Diagram
Figure 2. Refrigeration Module (RTRM) Gas Heating
LED or indications
YS/H Refrigeration Module
4 Zone Sensor Inputs (AIP)
4 Outputs
Non Heat Pump Config (BIP)
1 Compressor Config (BIP)
1 Stage Heat Config (BIP)
4 Thermostat inputs (BIP)
3 to 7 wire Communicating ZSM
Indoor Fan Output (BOP)
MODBUS Communication
Compressor 1 Output (BOP)
Compressor 1 Proving (BIP)
Compressor 1 Disable (BIP)
Emergency Stop (BIP)
Service Test input (BIP)
Outdoor Air Temp (AIP)
LEDs: System TX, RX
24 VAC
Power
Sensor
Resistor
CC1
IDF
Unit Control, Select one
Zone Sensor
Mechanical
Thermostat
G Y1 Y2 W1
R C/B
Zone Sensor
Programmable
COMM 3/4
Communication
Interface
Options
Module
Economizer
Module
w/Actuator
Gas Heat
Module
(IGN)
1200 BPS Comm
RTRM

RT-SVD03G-EN 13
Module Flow Diagram
Figure 3. Refrigeration Module (RTRM) Heat Pump
LED or indications
WS Refrigeration Module
4 Zone Sensor Inputs (AIP)
4 Outputs
No Electric Heat Configuration (BIP)
(open when heaters installed)
Outdoor Fan Output
7 Thermostat inputs (BIP)
3 to 7 wire Communicating ZSM
Switchover Valve Output
MODBUS Communication
Compressor 1 Output (BOP)
Compressor 1 Proving (BIP)
Coil Sensor Temp (AIP)
Electric Heat 2nd Stage
Compr 1 Disable (BIP)
Service Test input (BIP)
Outdoor Air Temp (AIP)
LEDs: System TX, RX
24 VAC
Power
Sensor
Resistor
Electric
Heat 2
Electric
Heat 1
CC1
SOV
Unit Control, Select one
Zone Sensor
Mechanical
Thermostat
G Y1 Y2 O
W2 X2 T
R C/B
Zone Sensor
Programmable
COMM 3/4
Communication
Interface
Options
Module
Economizer
Module
w/Actuator
IDF
ODF
Sensor
Indoor Fan Output
1 Stage Electric Heat Config. (BIP)
(open when 2 Stage
heaters installed)
Emergency Stop (BIP)
Outdoor Air Temp (AIP)
RTRM

14 RT-SVD03G-EN
Module Flow Diagram
Figure 4. Options Module (RTOM)
Options Module
Modbus Communication
Economizer
Actuator
Module
Refrigeration
Module
24 VAC
Supply Air Tempering Config (BIP)
Frostat Input (BIP)
Clogged Filter Input (BIP)
Fan Failure Switch (BIP)
Smoke Detector/Hi Temp Input (BIP)
Discharge
Air Sensor
24 VAC
Discharge Air Temperature (AIP)
Exhaust Fan Setpoint (AIP)
Relative
Humidity
Sensor
24 VAC Exhaust (BIP)
Purge (BIP)
Pressurize (BIP)
Dehumid SP
Humidistat (BIP) Dehum/Reheat
(3-50 tons)
Voyager 3 Configuration
Condenser Fan Cycling
(27.5 - 50 ton)
Modulating Gas Heat
Configuration
Discharge Air Heat Setpoint
Heat Pump Low Ambient Limit
Config.
Alarm Indication Config.
Reheat Enable
Supply Air Reheat Setpoint
RTOM

RT-SVD03G-EN 15
Module Flow Diagram
Figure 5. Honeywell Economizer Module (ECA)
Refrigeration
Module
24 VAC
Honeywell Economizer Module
Power Exhaust
ModBus Communication
24 VAC
PWR
EXH
relay
D
B
A
C Enthalpy/Temperature
Setpoint Pot.
0-50% Minimum
Position Pot.
C02 Setpoint Adjustment
(500-1500 ppm)
Mixed Air Temp (AIP)
10K 25C Neg Coeff
Return Air Relative Humidity (AIP)
4-20 mA Pos Coeff
Return Air Temp (AIP)
10K 25C Neg Coeff
Outdoor Air Relative Humidity (AIP)
4-20 mA Pos Coeff
IAQ Sensor (C02) (AIP)
0-10 VDC
Remote Minimum Position Pot. (AIP)
0-270 Ohm
MA Sensor
RH Sensor
RA Sensor
RH Sensor
Potentiometer
C02Sensor
Status LED
E
ECA

16 RT-SVD03G-EN
Module Flow Diagram
Figure 6. Economizer Module (RTEM)
Refrigeration
Module
24 VAC
ReliaTel Economizer Module
Power Exhaust
ModBus Communication
24 VAC
PWR
EXH
relay
D
B
A
CEnthalpy/Temperature
Setpoint Pot.
DCV Setpoint LL
300-1900 ppm
(RTRM v8.0 & later)
DCV Setpoint UL
500-1500 ppm (pre-RTRM
v8.0)
1000-2000 ppm (RTRM
v8.0 & later)
Mixed Air Temp (AIP)
10K 25C Neg Coeff
Return Air Relative Humidity (AIP)
4-20 mA Pos Coeff
Return Air Temp (AIP)
10K 25C Neg Coeff
Outdoor Air Relative Humidity (AIP)
4-20 mA Pos Coeff
IAQ Sensor (C02) (AIP)
0-10 VDC
Remote Minimum Position Pot. (AIP)
0-270 Ohm
MA Sensor
RH Sensor
RA Sensor
RH Sensor
Potentiometer
C02Sensor
Status LED
E
DCV Mode
24VAC
DCV Min Pos 0-40/50%
Design Min Pos 0-10/50%
RTEM

RT-SVD03G-EN 17
Module Flow Diagram
Figure 7. COMM 3/4 Module for ICS Communication/ LonTalk Communication Interface (LCI/TCI)
COMM 3/4 Module/LCI
Modbus Communication
Refrigeration
Module
24 VAC
Options
Module
Building
Automation
System(BAS)
Must be configured for
COMM3 or COMM4
depending on input
device.
LCI is self-configured.
Address (BIP)
COMM3/4 only
COMM3
COMM4
Receive LED
Transmit LED
or
RTAM (VAV)
LCI/TCI

18 RT-SVD03G-EN
Module Flow Diagram
Figure 8. Air Control Module (RTAM)
TCI/LCI
or
Refrigeration
Module
Options
Module
DIP Switch
Duct Static Pressure Transducer
IGV
or
VFD
VAV Box Relay
Remote Static
Pressure Setpoint
Remote Static
Pressure Deadband
Remote Reset
Setpoint
Remote Reset
Amount
Remote Morning
Warmup setpoint
Remote Supply
Air Cooling
Setpoint
Static Pressure
Setpoint
Static Pressure
Deadband
Reset
Setpoint
Reset
Amount
Morning
Warmup
Setpoint
Supply
Air Cooling
Setpoint
RTAM Module
Supply Air
Heating
Setpoint
Changeover
Input
RTAM

RT-SVD03G-EN 19
Module Flow Diagram
Figure 9. ReliaTel Ventilation Module (RTVM)
Ventilation Module
Modbus Communication
Options
Module
24 VAC
Statitrac Config
Exhaust Damper Output
Bldg. Pressure Transducer
Calibration Output
Bldg. Pressure Transducer
Bldg. Pressure
Setpoint
Bldg. Pressure
Setpoint Deadband
RTVM

20 RT-SVD03G-EN
Low Voltage Terminal Strip
TEST terminals.
ByjumperingfromTEST1toTEST2,theservicetechniciancantesttheunitorstartitwithorwithout
any controls attached. See TEST MODE section for details.
Compressor 1 disable.
Ifthefactoryinstalledjumperfrom1to2isremoved(Compressor1disable),compressor1willnot
run, even in the TEST MODE. This is where a load shedding device could be connected.
Compressor 2 disable.
Ifthefactoryinstalledjumperfrom3to4isremoved(Compressor2disable),compressor2willnot
run, even in the TEST MODE. This is where a load shedding device could be connected.
Emergency Stop.
If the factory installed jumper from 5 to 6 is removed (Emergency Stop), the unit will not run. The
RTRMsystemLEDwillbeon.TheunitwillhaveHeat+Cooldiagnostic.Anexternalsmokedetector
or other interlock device can be added here.
Figure 10. Low Voltage Terminal Strip
Figure 11. LTB Layout
Compressor 1 Disable
Compressor 2 Disable
Immediate Shutdown,
Automatic Reset
24 VAC
Test Terminals
Test 1 Test 2
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023
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
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
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#/-
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