Applications Guide Tracer Graphical Programming - Trane
Applications Guide Tracer Graphical Programming - Trane Applications Guide Tracer Graphical Programming - Trane
® Chapter 5 Cooling tower with variable-speed fan example Reviewing the sequence of operation In this scenario a cooling tower with a variable-speed fan delivers condenser water to a small chiller plant. The following specifications apply to control of the cooling tower. Condenser water pump When condenser water is requested by the chiller plant, command the condenser water pump to start. If condenser water flow fails to be confirmed within 30 seconds, command the pump to stop and indicate a pump failure at the operator display and turn on the alarm output. A user must be able to reset the alarm at the operator display. Cooling tower fan Upon successful confirmation of condenser water flow, and when the cooling tower supply water temperature exceeds the setpoint by 2.5°F, turn on the fan. Modulate the fan to maintain the condenser water supply temperature according to setpoint. When the cooling tower supply water temperature is 2.5°F below the setpoint, turn off the fan. Note that the setpoint is adjustable from the operator display and that it is limited to a minimum of 65°F and a maximum of 95°F. Sump heater Cycle the sump heater if the sump temperature falls below 40°F (this value is adjustable at the operator display). If the outdoor air temperature falls below 32°F, turn on the sump heater continuously. If the sump temperature remains below 36°F (this value is adjustable at the operator display) for 15 minutes, or if the sump temperature falls below 32°F, indicate an alarm at the operator display and turn on the alarm output. 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, including temperature and humidity, fails. Alarms must be resettable at the operator display. Calculations Calculate and display the change in water temperature across the cooling tower, the ambient wet-bulb temperature, and the approach temperature. (The approach temperature is defined as the difference between the ambient wet-bulb temperature and the condenser water supply temperature.) Thespecificationsforthepumpandthefanhavechanged.Thealarms have changed a little bit with the addition of the humidity sensor failure. The calculations section is completely new. 80 CNT-APG001-EN
® Reviewing the sequence of operation Analysis of this scenario results in Figure 84. The corresponding data definition is presented in Table 7, and a wiring diagram is presented in Figure 85 on page 83. Figure 84: Cooling tower with variable-speed fan drive data Table 7: Cooling tower with variable-speed fan drive data definition Data Type Name Notes Inputs Analog Supply Temp Universal input configured as thermistor or RTD (Balco, Platinum) Return Temp Universal input configured as thermistor or RTD (Balco, Platinum) Sump Temp Universal input configured as thermistor or RTD (Balco, Platinum) Binary Outdoor Air Temp Outdoor Air Humidity Flow Status Condenser Water Request Universal input configured as thermistor or RTD (Balco, Platinum) Universal input configured as a current input CNT-APG001-EN 81
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- Page 130 and 131: ® Chapter 6 VAV AHU example Review
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®<br />
Reviewing the sequence of operation<br />
Analysis of this scenario results in Figure 84. The corresponding data definition<br />
is presented in Table 7, and a wiring diagram is presented in<br />
Figure 85 on page 83.<br />
Figure 84: Cooling tower with variable-speed fan drive data<br />
Table 7: Cooling tower with variable-speed fan drive data definition<br />
Data Type Name Notes<br />
Inputs Analog Supply Temp Universal input configured as thermistor or RTD<br />
(Balco, Platinum)<br />
Return Temp Universal input configured as thermistor or RTD<br />
(Balco, Platinum)<br />
Sump Temp Universal input configured as thermistor or RTD<br />
(Balco, Platinum)<br />
Binary<br />
Outdoor Air<br />
Temp<br />
Outdoor Air<br />
Humidity<br />
Flow Status<br />
Condenser<br />
Water Request<br />
Universal input configured as thermistor or RTD<br />
(Balco, Platinum)<br />
Universal input configured as a current input<br />
CNT-APG001-EN 81
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