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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Capstone MicroTurbine C200 Heat Recovery Module (HRM) User’s Manual 4.2. Monitoring Water Temperature The function of the temperature controller is to ensure that the temperature of the water leaving the HRM is maintained at the user-defined setpoint. In so doing, the controller stores the value of the outlet water temperature in the process variable (PV), which is viewable on the controller screen. By viewing the process variable, the user can monitor the water temperature and compare it to the temperature setpoint, which can also be displayed on the screen. See Figure 4 for the location of the process variable and setpoint on the controller screen. Refer to the UDC2500 Universal Digital Controller Product Manual (Table 1) for details about information displayed on the controller screen. 4.2.1. Water Temperature Too High If the value of the process variable (PV) is consistently higher than the setpoint, the exit water temperature may be increasing to a level that requires corrective action. If the exit water temperature reaches the over-temperature setpoint, the temperature controller issues an over- temperature alarm and ALM 2 (Alarm 2) is lit on the screen. Alarm 2 is a pre-programmed alarm setpoint that may be adjusted by the user to the requirements of a specific application. When ALM 2 is lit on the screen, water temperature has exceeded the maximum limit for safe operation, and immediate action is necessary to lower the temperature to a manageable level. When the over-temperature alarm is tripped, the normally-closed contact of the controller’s Alarm 2 relay opens. The C200 microturbine reads this signal at the designated fault discrete input on connector J12 of the User Control Board (UCB). The C200 microturbine reports the over-temperature input from the HRM as a fault incident, which results in an immediate shutdown of the microturbine. Refer to the C200 Microturbine User’s Manual (Table 1) for details about the UCB and fault handling in the C200 microturbine. 4.2.2. Water Temperature Too Low Exit water temperature that is too low will not cause an alarm signal to appear on the controller screen. However, the exit water temperature in the process variable (PV) on the screen can be periodically compared with the temperature setpoint to determine if it is continually lower than required for desired performance. Lower temperatures in the water output from the HRM can indicate that the efficiency of the heat transfer process has been impacted. 5. Troubleshooting and Diagnostics This section provides basic troubleshooting information that an operator can use to find the source of problems with the HRM. The following paragraphs contain possible causes of temperature control problems and loss of controller power, as well as information about diagnostic messages on the temperature controller. 400021 Rev B (October 2012) Page 22 of 26 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. WARNING: Users do not perform some of the following microturbine troubleshooting procedures, but it is important for users to be aware of them. Many troubleshooting and repair tasks require a Capstone Authorized Service Provider (ASP) or electrician to perform. Only a Capstone ASP is permitted access to the inside of the HRM or microturbine enclosure. Also, an electrician may be needed to repair or adjust electrical equipment, such as a distribution panel, external to the HRM.PDF Image | Capstone MicroTurbine C200 Heat Recovery Module (HRM) User’s Manual
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