DCN: 141-00940-09 11/02/07
15
TXB16 Control Unit Installation
Location and Mounting
Install the TXB16 Control Unit in a protected, convenient, INDOOR location near the HVAC system or in a
service accessible area such as an equipment closet or garage.
Mount the Control Unit in a vertical position on a wall or sturdy structural member. The unit may be
mounted on the HVAC system but care should be taken to avoid the hot burner section or high vibration
areas.
Control unit wiring
The TXB16 HVAC Control Unit is connected to the HVAC system and to the Wall Display Unit as well as
the X10 communication interface and power connections.
Control Unit to WDU wiring
Control Unit to HVAC System wiring
Electrically, the Control Unit looks like a standard thermostat to your HVAC system. All connections to the
HVAC system are made at the normal thermostat connections on the HVAC unit.
Control Unit Setup.
You are advised to refer to your HVAC system’s documentation for specific
information on its thermostat connections and setup requirements.
You must know the following:
1. HVAC system type: Gas, Electric or Heat Pump
2. Fan requirement:
a. No fan with Heat (Gas heat)
b. Fan with Heat (Electric heat)
3. For Heat Pump systems: Changeover valve type:
a. Change over with cool (O thermostat connection)
b. Changeover with heat. (B thermostat connection)
Note on retrofit wiring
. You may note (and be sure to note on the wiring form) that you have additional
wires when you disconnect your old thermostat. Usually these wires are for auxiliary functions such as filter
or trouble indicators. For Heat Pump systems there may be emergency heat (EH) wiring or both O and B
changeover connections. These wires are not used in the TXB16 installation and in most cases these
extra wires are not required for normal HVAC system operation.
Refer to the following HVAC wiring diagrams for the type of HVAC system that you have, Standard
Gas/Electric or Heat Pump.
WDU
+12V
GND
DATA
CLK
J1
4 wire connection to Wall Display Unit
Use Thermostat wiring or 22 Ga Twisted pair
(Cat 3/5 wiring OK)
GND G
+12VDC +V
CLOCK C
DATA D
TS16
Control Unit
