Trane Rtaaiom3 Manual
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Page 71
71RTAA-IOM-3 Alarm/Running/Maximum Capacity Indicator Wiring If the optional remote Alarm/Running/ Maximum Capacity contacts are used, provide electrical power, 115 VAC (contact load not to exceed 1150 VA inrush, 115 VA sealed), with fused- disconnect to a customer-furnished remote device. Also provide proper remote device ground connection. To install the available remote running and alarm indication, the installer must provide leads 525 thru 532 from the panel to the proper terminals of terminal strip...
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72RTAA-IOM-3 External Chilled Water Setpoint (CWS): Remote Resistor/Potentiometer, Voltage Source 2-10 VDC, or Current Source 4-20 mA This option allows the external setting of the Chilled Water Setpoint, independent of the Front Panel Chilled Water Setpoint, by one of three means: 1. A remote resistor/potentiometer input (fixed or adjustable)2. An isolated voltage input 2-10 VDC 3. An isolated current loop input 4-20 mA Methods 2 and 3 are usually used in interfacing with a Generic BAS or a process...
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73RTAA-IOM-3 2. Isolated 2-10 VDC Voltage Source Input Set DIP Switch SW1-1 of Options Module 1U2 to “OFF”. Connect the voltage source to terminals TB1 -4 (+) and TB1 -5 (-) on Options Module 1U2. CWS is now based on the following equation: CW Setpoint 0 F = (VDC x 8.125) - 16.25 Sample values for CWS vs. VDC signals are shown in Table 13. Minimum setpoint = 0 F (2.0 VDC input) Maximum setpoint = 65 F (9.4 VDC input) Maximum continuous input voltage = 15 VDC Input impedance = 40.1 Kohms SW1 -1 off) 3....
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74RTAA-IOM-3 If the potentiometer is to be remotely mounted, it and the resistor must be connected to the UCM prior to mounting. Then, with the UCM display in Menu 0 and the display advanced to “Active Current Limit Setpoint”, the UCM can be used to calibrate the positions of the potentiometer to correspond with the desired settings for the current limits. External resistor input values for various current limit setpoints are shown in Table 14. 2. 2-10 VDC Voltage Source Input Set DIP Switch SW1-2 of...
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75RTAA-IOM-3 Installation Check List Complete this checklist as the unit is installed, to verify that all recommended procedures are accomplished before the unit is started. This checklist does not replace the detailed Instructions given in the “Installation -Mechanical” and “Installation -Electrical” sections of this manual. Read both sections completely, to become familiar with the installation procedures, prior to beginning the work. Receiving [ ] Verify that the unit nameplate data corresponds to...
Page 77
77RTAA-IOM-3 Operating Principles – Mechanical General This section describes the mechanical operating principles of Series R air- cooled chillers equipped with microcomputer-based control systems. The 130 thru 400-ton Model RTAA units are dual-circuited, helical-rotary type air-cooled liquid chillers. The basic components of an RTAA unit are: - Unit Control Module (UCM) - Unit-mounted panel - Helical-rotary compressor - Direct Expansion evaporator - Air-cooled condenser - Oil supply system (hydraulic...
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78RTAA-IOM-3 Figure 40 Refrigeration System and Control Components Single Circuit(Continued on Next Page)
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79RTAA-IOM-3 Figure 40 (Continued from Previous Page) 1 Schrader valve 2 Suction temperature sensor* 3 Manufacturing process tube 4 Suction service valve (optional) 5 Motor winding thermostat* 6 Discharge temperature sensor* 7 Pressure relief valve (450 psi) 8 High pressure cutout (405 psi)* 9 Discharge check valve 10 Evaporator waterside vent 11 Discharge line shutoff valve 12 Oil separator in/out cap 13 Saturated condensing temperature sensor* 14 Condenser header 15 Subcooler header 16 Liquid line...
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80RTAA-IOM-3 Figure 41 Refrigeration System and Control Components Duplex Circuit(Continued on Next Page)