Voyager Commercial 27½ To 50 Tons Cv And Vav; Overview; Constant Volume (Cv); Variable Air Volume (Vav) - Trane ReliaTel Diagnostic Manual

Voyager Commercial 27½ to 50 Tons CV and VAV

Overview

As of April 19, 2004, all 27½ to 50 ton commercial rooftop units YCD, YCH, TED, TEH, TCD, TCH 330-
600 are built using ReliaTel controls. The 10th digit of the model number is "M" and beyond. ReliaTel
controls replace the now obsolete UCP controls.

Constant Volume (CV)

CV units operate much like 3-25 ton units with a few exceptions. These units may use a
conventional thermostat or zone sensor. The units can be controlled using a LonTalk
Communications Interface (LCI) or Tracer™ Summit. Every unit comes with an RTRM and RTOM.
All other circuit boards are optional depending upon unit configuration. Troubleshooting the
controls is comparable to 3-25 ton units.

Variable Air Volume (VAV)

VAV units use the same circuit boards as CV models, but operation and in some cases
troubleshooting, are significantly different. The following section contains operating and
troubleshooting information on VAV units. Every unit comes with an RTRM, RTOM, and RTAM.
Additional information can be found in the Installation Operation and Maintenance (IOM) guide.
VAV with ReliaTel versus VAV with UCP
ReliaTel units do everything UCP units did and more. Here are some differences between UCP and
ReliaTel units:
VAV Setpoint panel: ReliaTel has the same setpoints as UCP but they are mounted on (and integral
to) the RTAM module. Also, every setpoint can be provided remotely by clipping the appropriate
jumper and using the terminal strip on the RTAM
Exhaust Fan Setpoint panel: ReliaTel exhaust fan setpoint potentiometer is located on the RTOM
module in the main control box.
Zone sensor and NSB inputs: With ReliaTel, these inputs are located on the RTRM module instead
of LTB1 (UCP).
Note: The thermostat inputs on the RTRM are ignored. These inputs are for CV units only.
Emergency stop: This input, called ESTOP , is located on LTB1-5 and LTB1-6 instead of LTB1-16 and
LTB1-17 (UCP).
The following modules are used in 27.5-50 ton Voyager units as of 4/19/04. Digit 10 of the model
number is M or higher. ReliaTel modules communicate with each other on a ModBus link. Each
module has a status LED indicating that the module is communicating with the link.

RTRM - ReliaTel Refrigeration Module - (standard)

This is the primary control module. It has built-in terminal strips for Zone Sensor, thermostat, and
Night Setback connections as well as diagnostic outputs for service. In addition, the RTRM has the
following inputs and outputs:
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Compressor outputs
Outdoor fan relay outputs
Low Pressure (LPC) inputs
Outdoor Air Sensor (OAS) input
Supply Fan output
Electric Heat outputs (TE* only)
TEST mode input
Emergency Stop input
RT-SVD03G-EN