Install Instructions

Alternate Wiring:
Wiring Instructions
1. Connect the WHITE wire to the transformer's common
connection.
2. Connect the RED wire to the transformer's hot output.
3. Connect the GREEN wire to a ground source that is
electrically common to the boiler ground.
4. Cut off the quick connectors from both YELLOW wires and
strip the wire ends.
5. Open the 24 VAC hot connection to the other limit controls
ahead of the fi rst limit control.
6. Wire the YELLOW leads as shown to connect the LTR's
relay in series and ahead of all other limit controls.
24 VAC Class 2
Transformer
120 VAC
HOT
COMMON
24 VAC
GREEN
WHITE
RED
YELLOW
YELLOW
Limit
Controls
Gas
Valve
Wiring Boilers with an Integrated Control Module:
On boilers equipped with a United Technologies integrated
boiler control module, Taco recommends the use of the "Boiler
Module Wiring Harness". This harness is standard on the
LTR0243U-1 controls or is available from Taco.
Wiring Instructions
1. Disconnect the boiler wire harness from the integrated
control module.
2. Plug the boiler wire harness connector into the female
connector on the LTR wiring harness.
3. Plug the male connector on the LTR wiring harness into the
integrated control module.
4. Plug boiler module module wiring harness into LTR.
Integrated Boiler
Control
Male
Connector
Female
Connector
Factory Wiring
Boiler Module
Wiring Harness
1
3
2
4
• Shock hazard. Disconnect power source before servicing. Serious
injury or death could result.
• Only use the wiring harness supplied with the control or factory
supplied alternates. Use of other wire harnesses or insulation types
could result in fi re causing property damage, serious injury, and
death.