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 ignition control and economizer are different than the ones used with ReliaTel.
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)
Every ReliaTel unit uses an RTRM. The RTRM provides primary unit control for heating and cooling.
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: Unlike the previous Micro, a conventional thermostat does not require any sort of interface.
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.
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