Operation with a conventional thermostat

Operation

Operation with a conventional thermostat

The ReliaTel module has conventional thermostat connections as well as Zone Sensor Module connections. When a conventional thermostat is controlling the unit, operation differs as follows:

•Supply Air Tempering feature is not available. If outdoor air is being introduced through the equipment, discharge air temperature may be cold when not actively heating.

•Proportional Integral (PI) control is not available.

•Zone Sensor Diagnostics are only available on the RTRM module on the J6 terminals, instead of at the Zone Sensor in the space.

•Intelligent Fall-Back is not available. If a failure occurs in the device controlling the equipment, operation will cease.

•Heat Pump Smart Recovery and Smart Staging is not available. Heat Pump operation becomes more costly unless the generic control being applied can accomplish this.

•Remote Sensing Capabilities are not available on most mechanical thermostats.

•Space Temperature Averaging capabilities are not available on most mechanical thermostats.

•27½ to 50 VAV - Conventional thermostat input terminals are inactive.

•Built in Night Set Back and Unoccupied Functions function differently with a conventional mechanical thermostat.

•A built-in algorithm which allows for automatic reset of the discharge air temperature while economizing is not available.

The terminal strip for attaching the thermostat wires is located on the RTRM module in the control compartment.

When the unit is operating from a conventional thermostat or other binary input, the economizer setpoint feature, relative to the cooling and heating setpoints, is lost. The economizer control is based strictly on a signal from the thermostat, but still maintains mixed air temperature control of 53°±3°F when in the economizer mode. The economizer enable and disable function is still determined by the outside air sensor through the RTRM.

If a single-stage thermostat is used, only the economizer (if enabled) or the compressor (if economizer is disabled) will operate on a call for cooling. A twostage thermostat is required to achieve economizer operation and compressor operation at the same time.

With economizer enabled, a Y1 call for 1st stage cooling will be the economizer. The damper will modulate between minimum position and 100% to maintain mixed air temperature at 53°±3°. At 50°F the damper will be at minimum position. If the economizer is enabled, a Y2 call for 2nd stage cooling will start the first compressor if required. If the economizer is disabled, 1st stage (Y1) will be the first compressor. If the unit has two compressors, a call for 2nd stage cooling (Y2) will start the second compressor. When using a conventional thermostat, or other binary input, the ReliaTel controls will only allow two stages of cooling.

Figure 30 - Terminal strip

COM

W1/0

Customers occasionally require operation with a conventional thermostat rather than a zone sensor. In some cases there is a preference for a specific thermostat model, and in others there is reluctance to adopt newer technology that may not be as well understood as conventional thermostats. In addition, non-Trane Building Controllers typically provide an interface to HVAC equipment based on a conventional thermostat interface. Units applied with this type of controller need to accept conventional thermostat inputs.

48	RT-SVX20A-E4

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