User manual TRANE RTAD-SVX01E4

[. . . ] Installation Operation Maintenance Series RTM Air-Cooled Helical Rotary Liquid Chiller RTAD 085 - 180 (50Hz) Standard, Free Cooling and Heat Recovery models RTAD-SVX01E-E4 General information Foreword These instructions are given as a guide to good practice in the installation, start-up, operation, and maintenance by the user, of Trane RTAD chillers. They do not contain full service procedures necessary for the continued successful operation of this equipment. The services of a qualified technician should be employed through the medium of a maintenance contract with a reputable service company. Read this manual thoroughly before unit start-up. [. . . ] CWS is now based on the following equation: Setpoint (°C) = (mA * 2. 44) - 27. 56 External chilled-water setpoint: voltage source 2-10 V (dc), or current source 4-20 mA This option allows the external setting of the chilled-water setpoint (CWS), independent of the front panel chilled-water setpoint, by one of two means: 1 - An isolated voltage input 2-10 V (dc) 2 - An isolated current loop input 4-20 mA Note: For Free-Cooling units, this option will be available only in Compressor mode. RTAD-SVX01E-E4 55 Installation - Electrical External current limit setpoint: voltage source 2-10 V (dc) or current source 4-20 mA. This option allows the external setting of the current limit setpoint (CLS), independent of the front panel current-limit setpoint, by one of the two means: 1 - an isolated voltage input 2-10 V (dc) 2 - an isolated voltage input 4-20 mA To enable external current-limit setpoint operation, external currentlimit setpoint (operator setting menu) should be set to "E" using the clear language display. 1- 2-10 V (dc) voltage source input Set dipswitch SW1-2 of the option module A9 to "OFF . " Connect the voltage source to terminals 7 (+) and 8 (-) of the option module A9. CLS is now based on the following equation: CLS % = (V (dc)*10) + 20 Sample values for CLS vs. Minimum setpoint: 40% (2. 0 V (dc)input) Maximum setpoint: 120% (10. 0 V (dc)input) 4-20 mA Current source input Set dipswitch SW1-2 of the option module A9 to "ON. " Connect the current source to terminal 7 (+) and 8 (-) of option module A9. CLS is now based on the following equation: CLS % = (mA * 5) + 20 Sample values for CLS versus mA signals are shown in Table 29. Minimum setpoint = 40% (4. 0 mA) Maximum setpoint = 120% (20. 0 mA) Table 37 - Input values vs. external current-limit setpoint Resulting chilled-water setpoint (°C) 40 50 60 70 80 90 100 110 120 Outdoor air-temperature sensor This sensor is used for low ambient lockout and chilled-water reset by outdoor air temperature. This sensor is optional on the RTAD units. Remove the sensor from its shipping location in the control panel and install it in the fresh-air intake on the north wall of the building. Protect the sensor from direct sunlight and shelter it from the elements. Connect leads to terminals 1 and 2 from module A9 TB1. All wiring to and from the remote sensor must be made with shielded, twisted-pair conductors. Be sure to ground the shielding only at the UCM-CLD. Apply tape to the sensor end of the shielding to prevent it from contacting the surface. To prevent injury or death, disconnect the electrical power source before completing wiring connections to the unit. Voltage (V (dc)) 2. 0 3. 0 4. 0 5. 0 6. 0 7. 0 8. 0 9. 0 10. 0 Current (mA) 4. 0 6. 0 8. 0 10. 0 12. 0 14. 0 16. 0 18. 0 20. 0 Note: Not available for Free-Cooling units. 56 RTAD-SVX01E-E4 Installation - Electrical CAUTION!To prevent overheating at the terminal connections, use copper conductors only. Communication-link connection procedure 1. Refer to the Tracer installation literature to determine proper communication-link termination connections at the Tracer module. Connect the shield of the communication-link wiring to the designated shield terminal at the Tracer module. Connect leads to terminals 1 to 4 of TB2 of the module A9 of the UCM-CLD to the Tracer. There is no polarity requirement for the connection. At the UCM-CLD, the shield should be cut and taped to prevent any contact between the shield and ground. Communication card CSR This option allows the Clear Language Display in the control panel on RTAD units to exchange information (operating setpoints and Auto/Standby commands) with a higher-level control device, such as Tracer. [. . . ] Make sure that the filter shut off valve is closed. Other compressor isolation valves may also be closed depending upon the service that was completed. For example, changing the oil filter would require the compressor to be isolated and pulled into vacuum. Note: this procedure assumes that the oil that is put into the filter housing does not have contaminants such as non-condensable gases. The oil forces these gases out of the filter and oil line shut off valve without the need to pull a vacuum on this small volume. [. . . ]