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.
8. Trouble Shooting & FAQ’s
For your convenience, the Taco Tech Support team is available anytime 24/7. Just call 401-
942-8000 for help.
Problem:
Digital thermostats do not work correctly when connected to a switching relay.
Solution:
Some thermostats are a “Power Stealing” type which means
they are powered by the
switching relay with just 2 wires (
R
&
W
). A
resistor may be needed in order to have the thermostat
work properly.
This resistor should be placed between the
W
&
C
(
common
) terminals of the
switching relay. If the thermostat manufacturer does not
supply a resistor, a 1000 ohm ½ watt
resistor has proven to work with most.
Problem:
No heat in a zone or room of building.
Solution:
LED diagnostic lights will help find a component that is
not working properly. The
green LED should always be on, indicating
that power is connected, and the solid-state fuse is
good. When there is a call for heat, the red LED will come on indicating power to the zone
circulator. This indicates the thermostat is working correctly. If the red LED does not come
on, then check the thermostat and thermostat wiring for errors.
Problem:
Solution:
9. Inner Cover Removal & Fuses:
1. Gently push in tab in with finger on side of inner cover.
2. Lift cover and hinge up to remove it.
3. Fuses are replaceable; with 2 spare fuses attached to inner cover near
transformer.