10
I. ETC102 CONTROL
❑ WARNING: Do not use ETC102 with 110V circuits to the TT
terminals. For Switching 110V, use switch terminals. (See
THERMOSTAT DIAGRAM 7 on page 19).
❑ The ETC102 TR/TW/C terminals are rated at 24VAC, 1 amp
resistive.
❑ The ETC102 SWITCH terminals are rated at 120VAC, 10 amp
resistive.
❑ For controlling zone valves, multi-zone controllers and switching
relays, follow applicable wiring diagrams for typical low voltage
thermostat circuits.
❑ Some newer switching relay models do not work properly with “Power
Stealing” thermostats. The ETC102 can be a power stealing
thermostat unless powered separately. Connect 24VAC power from
the switching relay board or from a step-down transformer to 24V and
0V terminals. (See THERMOSTAT DIAGRAM 4 on page 17 and
THERMOSTAT DIAGRAM 7 on page 19).
J. TPI WIRING CONTROL
❑ NOTE: THE TPI THERMOSTAT MUST BE POWERED WITH
24VAC.
❑ The TPI 24VAC only requires 20mA, or about 0.5 Watts.
❑ 24VAC power must be connected to 24VAC connectors on the
bottom right corner of TPI. (See THERMOSTAT DIAGRAM 5 on page
18).
❑ Connect control wiring to PUMP/TT normally open relay connections
(rated for both 24V and 110V wiring) on the bottom left corner of TPI.
(See THERMOSTAT DIAGRAM 5 on page 18).
❑ All and only 110VAC wiring must go through an appropriate chase
nipple installed in the knockout at bottom of TPI case.
❑ TPI Wiring will vary depending on the type of boiler and valve controls
in the system. (See THERMOSTAT DIAGRAM 5 on page 18).
❑ CAUTION: If Sensor is soldered directly to TPI, DO NOT BEND
SHARPLY OR OVERWORK.
K. INSULATION INSTALLATION
❑ Place included fiberglass insulation between and around the water
supply and boiler supply connections. Attach lid using the four screws
provided. (See FIGURE 2 on page 22)
❑ Insulate hot water pipes with pipe insulation.
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