Honeywell TB6575B1000/U Installation Instructions - Page 6

TB6575/TB8575 DIGITAL FAN COIL THERMOSTATS Accessory Wiring Remote Pipe Sensor Wiring The remote pipe sensor is used for 2 pipes auto and 2 pipes heat and cool with auxiliary heat changeover. The pipe sensor will sense the temperature in the pipes to tell the thermostat when the system is set for Heat or Cool. 1. Check Installer Setup Number (ISU) 5 to ensure it is set to the desired value. (See Table 4 on page 11). 2. Wire pipe sensor to Sc and Ps terminals. 3. Attach pipe sensor to the pipe. 4. Insulate pipe sensor, as necessary. 5. Change pipe sensor thresholds for cooling or heat- ing by setting Installer Setup Numbers (ISU) 6 and 7 to desired values. NOTE: For complete wiring instructions, please follow the installation instructions provided with the remote sensor. Sensor Wiring for Temperature Averaging Fig. 4-Fig. 6 illustrate sensor wiring for temperature averaging applications. SUBBASE Rs Sc TR21 TR21 T T T T Remote Temperature Sensor Wiring The TR21 is an optional remote temperature sensor that can be used as an alternative to the internal sensor. In addition to the TR21, other sensors that use a 20k Ohm curve may be used as the remote sensor. TR21 TR21 T T T T WARNING Risk of electrical shock. Can cause severe injury, property damage or death. Disconnect power supply before servicing. M27559 Fig. 4. Wiring four TR21 (20K ohm) sensors. CAUTION Erratic system operation hazard. Failure to follow proper wiring practices can introduce disruptive electrical interference (noise). Keep wiring at least one foot away from large inductive loads such as motors line starters, lighting ballasts, and large power distribution panels. Shielded cable is required in installations where these guidelines cannot be met. Ground shield only to grounded controller case. IMPORTANT All wiring must comply with local electrical codes and ordinances or as specified on installation wiring diagrams. - Wall module wiring can be sized from 16 to 22 AWG (1.31 to 0.33 sq. mm) depending on the application. - The maximum length of wire from the thermostat to a wall module is 1000 ft. (305 m). - Twisted pair wire is recommended for wire runs longer than 100 ft. (30.5 m). 1. Check Installer Setup Number (ISU) 4 to ensure it is set to use the remote sensor. (See Table 4 on page 11). 2. Wire sensor to Rs and Sc thermostat terminals. 3. Push excess wire back into the hole. Plug the hole using non-hardening caulk, putty or insulation to prevent drafts from affecting performance. 4. Remove sensor cover. 5. Mount sensor to the wall or junction box using the screws and anchors provided. 6. Level the sensor for appearance only. Device functions correctly even when not level. 7. Replace sensor cover. SUBBASE Rs Sc T4 T3 T4 T3 1 TR21-A 1 TR21-A 1 THE TR21-A IS A 10K OHM SENSOR. M27560 Fig. 5. Wiring two TR21-A (10K ohm) sensors to provide a temperature averaging network. SUBBASE Rs Sc TR21 T T T4 T3 TR21 T T 1 TR21-A 1 THE TR21-A IS A 10K OHM SENSOR. M27561 Fig. 6. Wiring two TR21 (20K ohm) sensors and one TR21-A (10K ohm) sensor to provide a temperature averaging network. 62-0311-05 6