Honeywell TB6575 SuitePRO Installation Instructions Manual page 6

TB6575/TB8575 SUITEPRO™ DIGITAL FAN COIL THERMOSTATS
Remote Pipe Sensor Wiring
The remote pipe sensor is used for 2 pipe auto 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 10).
2. Wire pipe sensor to Sb and Ps terminals.
3. Attach pipe sensor to the pipe.
4. Change pipe sensor thresholds for cooling or heating by
setting Installer Setup Numbers (ISU) 6 and 7 to desired
values.
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 Honeywell sensors that use a 20k Ohm curve may
be used as the remote sensor.
WARNING
Risk of electrical shock.
Can cause severe injury, property damage or
death.
Disconnect power supply before servicing.
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 dia-
grams.
— 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 10).
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.
NOTE: For complete wiring instructions, please follow the
installation instructions provided with the remote
sensor.
62-0278—01
Sensor Wiring for Temperature Averaging
Fig. 5 – Fig. 7 illustrate sensor wiring for temperature averaging
applications.
Rs
TR21
T
TR21
T
Fig. 5. Wiring four TR21 (20K ohm) sensors.
Rs
T4
1
TR21-A
1 THE TR21-A IS A 10K OHM SENSOR.
Fig. 6. Wiring two TR21-A (10K ohm) sensors to
provide a temperature averaging network.
TR21
T
TR21
T
1 THE TR21-A IS A 10K OHM SENSOR.
Fig. 7. Wiring two TR21 (20K ohm) sensors and
one TR21-A (10K ohm) sensor to provide
a temperature averaging network.
Thermostat Wiring Diagrams
The figures in this section illustrate typical wiring for:
• TB6575A1000 and TB6575B1000 fan coil thermostats, which
are 120/240 Vac powered. Refer to Fig. 8 – Fig. 14, beginning
on page 7,
• TB8575A1000 model, which is 24 Vac powered. Refer to
Fig. 15 – Fig. 21, beginning on page 8.
6
INSTALLATION
SUBBASE
Sc
TR21
T T T
TR21
T T T
M27559
SUBBASE
Sc
T3 T4 T3
1
TR21-A
M27560
SUBBASE
Rs Sc
T4 T3
T
1
TR21-A
T
M27561