Wiring Guide
Table Of Contents
- Thermostat Input (24 vac):
- Power Input (120 vac):
- Circulator Output; Secondary / AUX 1 (120 vac):
- Circulator Output; Primary / AUX 2 (120 vac):
- H Connect the Hot output to Hot power input on circulator.
- Circulator Output; Priority Zone / AUX 3 (120 vac):
- 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
- 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 and long on cycles usually is too low of water temperature.
Outdoor Reset Control uses an outdoor sensor to compare it against the a 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 9 of this manual on page X to have access to wire.
Sensor Connections:
Boiler Sensor: A boiler supply sensor is required for either indoor or outdoor reset.
Mount the supplied strap-on sensor to the supply piping of boiler and
wire the sensor to the Boiler Sensor terminal block on zone control.
Outdoor Sensor: An outdoor sensor is required when utilizing the outdoor reset
function. Mount the Taco outdoor sensor P# 9300-2052RP on north
side of building and wire to Outdoor Sensor terminal block on zone
control.
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.