Honeywell TB6575B1000/U Installation Instructions - Page 14

TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS NOTE: Exiting Installer Test Mode is the same as the method for entering test mode, OPERATION Test M27587 Fig. 25. Installer Test (IT) mode screen. PROPORTIONAL + INTEGRAL (P+I) CONTROL Like a mechanical thermostat, the fan coil thermostats have On/Off control output. However, this output is regulated by a P+I algorithm, enabling the thermostat to control closer to setpoint than conventional thermostats. This results in performance where the space temperature is maintained within 0.75°C (1.5°F) of the setpoint regardless of fan speed. NOTE: Integral action corrects the temperature control errors of proportional-only control, but it is slower to react to large temperature or setpoint changes. Table 5. Installer Test (IT) Codes and Options. IT Code Option Code Description Value Option Description 10 Heat Control 0 Close 1 Open 20 Auxiliary Heat Control 0 Close 1 Open 30 Cool Control 0 Close 1 Open 40 Fan Control 0 Close 1 Low Speed 2 Medium Speed 3 High Speed 50 Pipe Sensor 32-199 Displays the pipe sensor temperature. Only used for System Type 3 or 6 (ISU code #2, value 3 or 6). Only the Analog pipe sensor is tested. 71 Software Main version 01-99 A 2-digit number, 01-99 72 Software Vice version 01-99 A 2-digit number, 01-99 73 Configuration 01-99 A 2-digit number, 01-99 Data Main version 74 Configuration 01-99 A 2-digit number, 01-99 Data Vice version 75 Week Produced 01-52 A 2-digit number, 01-52 76 Year Produced 08-99 A 2-digit number, 08-99 Economy Setback Modes ACTIVITY SENSING (ISU CODE #22) If Activity Sensing is enabled, any time the thermostat is not touched (no single key is pressed) for the duration selected, the thermostat automatically falls back into the Economy Setback. The LCD displays ECONOMY SETBACK just to the right of the main temperature display to indicate Activity Sensing mode is active. When any key is pressed, the thermostat controls to Occupied mode. BUTTON PRESS SETBACK (ISU CODE #19-5) The default remote setback option is for economy setback via a button press on the thermostat. In this mode, the thermostat can quickly be setback by pressing and holding down the System Mode button for more than 3 seconds. The LCD displays ECONOMY SETBACK just to the right of the main temperature display to indicate the Setback is active. When any key is pressed, the thermostat controls to Occupied mode. REMOTE SETBACK (ISU CODE #19) Remote Setback is activated by a dry contact closure on the remote setback input from an occupancy sensor, time switch, or hotel card key. The thermostat controls to the user/installer defined setback setpoints for increased energy savings. The LCD displays Economy Setback just to the right of the main temperature display to indicate the Remote Setback mode is active. When Remote Setback is active, all buttons on the thermostat are disabled. However, the button combinations to access Installer Setup (ISU) and Installer Test (IT) remain enabled. ECONOMY SETBACK OPERATION For Heat Mode, when Economy Setback is enabled, the set point changes to the remote setback heating setpoint (ISU CODE #20). For Cool Mode, when Economy Setback is enabled, the set point changes to the remote setback cooling setpoint (ISU CODE #21). For 4 pipe applications with Auto Changeover and Heat/ Cool Setpoints, when Economy Setback is enabled, the cool setpoint changes to the remote setback cooling setpoint and the heat setpoint changes to the remote setback heating setpoint. The new effective deadband is the difference between the remote setback heating setpoint and the remote setback cooling setpoint. 62-0311-05 14