Wiring Guide
Table Of Contents
- Thermostat Input (24 vac):
- Power Input (120 vac):
- Circulator Output; Zones 1-6 (120 vac):
- Circulator Output; ZR / AUX 1 (120 vac):
- Circulator Output; Primary / AUX 2 (120 vac):
- H Connect the Hot output to Hot power input on circulator.
- Low Limit Aquastat / Tankless Coil Application (120 vac):
- SmartPlus Recirc Logic Sensor
- -Connect the strap-on sensor to the two terminals labeled Recirc Sensor on switching relay.
- SAFETY NOTICE
- TWO SEPARATE sources of power may be connected to an oil boiler’s aquastat control.
- Zone naming
- Programmable output naming
- Alerts & messages
- Post purge time delay adjustment
- Pump exercise time delay adjustment
- Priority protection time delay adjustment
- Indoor boiler reset
- Outdoor boiler reset
- SmartPlus® DHW recirculation logic
- AUX 1 output behavior
- AUX 2 output behavior
- AUX 3 output behavior
- Cooling function
- Zone association
- For your convenience, the Taco Tech Support team is available anytime 24/7. Just call 401-942-8000 for help.
6.
Reset Control Setup & Wiring (Optional)
Boiler Reset Types:
The ZVC406-5 includes two types of boiler reset control logic:
Indoor Reset Control (Load Reset) uses the thermostat cycling information to determine the
supply water temperature. Thermostat short cycling usually indicates supply water
temperature is too high. Long on cycles usually indicates supply water temperature is too low.
Outdoor Reset Control uses an outdoor sensor to compare it against the reset ratio
(configured by installer) to determine the appropriate supply water temperature.
General Operation:
When any thermostat calls for heat,
the appropriate zone valve is
energized, and the yellow light goes on. When the zone valve is fully open, the red light goes
on and energizes the circulator relay(s). The boiler end switch relay and modulating output will
be controlled by the reset algorithm. either based on indoor thermostat operation or on
outdoor temperature.
Control Setup:
The Taco eLink mobile app is required to set type of reset control and
parameters to operate. See section 7 for more information on the Taco eLink mobile app.
Wiring of Reset Control:
Remove the inner cover as shown in section 10, page X of this manual to have access to wire.
Sensor Connections:
Boiler Sensor: A boiler supply sensor is required for either indoor or outdoor reset.
Wire the supplied strap-on sensor to the Boiler Sensor terminal block.
Outdoor Sensor: An outdoor sensor is required when utilizing the outdoor reset
function. Connect Taco sensor P# 9300-2052RP to Outdoor Sensor
terminal block and mount on north side of building.
Boiler Connections:
Modulating Output: Most Mod-Con boilers have and input for an external modulating
signal (0-10 vdc or 4-20 ma) to control boiler. Connect the
modulating output to appropriate input terminals on boiler; noting
that the polarity is correct. Some Mod-Con boilers also require a T T
call for heat to activate boiler. In this case, wire the Main Boiler End
Switch to T T input on boiler.
Dry Contact End Switch: ON/OFF boilers are controlled by the Main Boiler End Switch on
zone control. Wire the Main Boiler End Switch to T T input on boiler.