TR16 Installation
STOP
Before proceeding with removing an existing thermostat and installing the TR16,
Read the following important steps.
1. Record existing wiring information on the enclosed wiring form.
2. Perform the TR16 bench test
3. Check WDU wiring BEFORE applying power to control unit.
4. Be sure to install a freeze protection device as required.
Installation Overview
Standard thermostat wiring vs TR16 in retrofit applications.
Heating &
Cooling
System
4, 5 or 6 wires
18Ga thermostat wiring
4 Wires
TR16
Control
Unit
Heating &
Cooling
System
TR16
Wall Display
Unit
Thermostat
Replace
Thermostat with
Wall Display Unit
Insert Control Unit into
the thermostat wiring
OLD
NEW
4,5 or 6 wires
as original
installation
R
W
40-45
°
Heating
System
Thermostat connections
Red Wire 24VAC R
White Wire Heat W
Freeze Protection.
In cold climates that require the heating system to be used for building freeze protection, a mechanical
backup freeze protection device MUST be installed on the heating system. This can be a simple
mechanical heating thermostat or a preset thermoswitch installed in the heated area.
Mechanical
Thermostat or
Thermoswitch
Wire across Heater R/W terminals.
DCN: 141-00930-09 7/13/06
11
