Applications Guide Tracer Graphical Programming - Trane

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® Chapter 8 Constant-volume AHU with warm-up, pre-cool, and communications is in heat mode, the supply fan is off, or the discharge air temperature sensor is failed. Heating valve Modulatetheheatingvalvetomaintainthedischargeairtemperatureat the discharge air heating setpoint. Close the heating valve if the air handler is in cool mode, the supply fan is off, or the discharge air temperature sensor is failed. Open the heating valve if the supply fan is off and the outdoor air temperature falls below the adjustable freeze avoidance setpoint. Humidification Enable humidification when the air handler is in occupied mode, the supply fan is on, and the outdoor air temperature falls below 55°F. Modulate the humidifier to maintain the space relative humidity setpoint. If the duct relative humidity exceeds 85%, turn off the humidifier to prevent condensation in the duct work and indicate an alarm. Dehumidification Enable dehumidification mode when the air handler is occupied, the supply fan is on, the outdoor air temperature is above 55°F, and the space relative humidity is above the space dehumidification setpoint. Modulate the cooling valve to maintain space relative humidity and the heating valve to maintain discharge air temperature. Alarms In addition to the alarm requirements mentioned above, indicate an alarm at the operator display and turn on the alarm output when any sensor fails. Alarms must be resettable at the operator display. Diagnostics conditions include the following: • Dirty filter • Duct humidity high limit • Exhaust fan failure • Low outdoor air temperature • Low (mixed air) temperature detection • Sensor failure (including discharge air temperature, mixed air temperature, outdoor air temperature, space temperature, and duct static pressure) • Supply fan failure The following failures shutdown the air handler and require a manual reset: • Discharge or mixed air temperature sensor failure • Fan failure • Low mixed air temperature 194 CNT-APG001-EN
® Reviewing the sequence of operation The corresponding data definition is presented in Table 23 and Table 24, and a wiring diagram is presented in Figure 165 on page 198. Table 23: Modified constant-volume AHU inputs and outputs data definition Inputs and outputs Type Name Notes Inputs 1 Analog Space Temp Universal input configured as thermistor or RTD 2 Analog Thumbwheel SP Universal input configured as thermistor or RTD 3 Analog Mixed Air Temp Universal input configured as thermistor or RTD 4 Analog Discharge Air Temp Universal input configured as thermistor or RTD 5 Analog Outdoor Air Temp Universal input configured as thermistor 6 Analog Duct Humidity 7 Binary Low Temp Detect 8 Binary Run/Stop Interlock 9 Binary Occupancy/Generic 10 Binary Supply Fan Status 11 Binary Filter Status 12 Binary Exhaust Fan Status Pressure Duct Static Pressure* Binary outputs 1 Supply Fan Start/Stop 2 Exhaust Fan Start/Stop 3 Not Used 4 Not Used 5 Not Used 6 Alarm Output Status/custom alarm indicator Analog outputs 1 Supply Fan Speed* Analog output configured as voltage, 0–10 V 2 Cooling Valve Position Analog output configured as voltage, 0–10 V 3 Heating Valve Position Analog output configured as voltage, 0–10 V 4 Face and Bypass Damper* Analog output configured as voltage, 0–10 V 5 OA Damper Position Analog output configured as voltage, 0–10 V 6 Humidifier Analog output configured as voltage, 0–10 V * These inputs and outputs are not used in this program but are often used in air-handler programs. Note: The inputs and outputs in this table are configured so that a Tracer AH540 main logic board could be replaced with a Tracer MP580/581 board, except for the Mixed Air Temp, which is input 6 on the Tracer AH540. Table 24: Modified constant-volume AHU variables data definition Variable Name Notes Tracer Summit binary variables Economizer Enable BAS Setpoint Enable Alarm Reset (BAS) CNT-APG001-EN 195
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Applications Guide Tracer Graphical
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CNT-APG001-EN ®
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Trane An American Standard Company
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Applications Guide Tracer Graphical Programming - Trane

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