Install Instructions

WIRING TO 24 VAC TRANSFORMER
For boilers using a standard 24 VAC transformer
WIRING TO INTEGRATED BOILER CONTROL MODULE
Connect RED wire to hot side of 24 Volt boiler trans-
former (R). Connect WHITE wire to common side of
24 Volt boiler transformer (C). Connect the GREEN
wire to any suitable, unpainted ground screw.
Note: for operation of the control, the green wire
must be connected to a ground source electrically
common with boiler ground.
Cut-off the connectors and strip the ends of the two
yellow wires of the Model 1100 harness. Break into
the burner circuit between the hot side of the trans-
former (R) and other limit controls. Connect either
YELLOW wire to the hot side. Connect the other
YELLOW wire in series with other limit controls.
Important: The switch contacts of the low water cut-
off (yellow wires) must be wired in series with all
other limit and operating controls (as shown above).
Important: For boilers equipped with a United Technologies
Integrated Boiler Control Module, Hydrolevel does not rec-
ommend use of the supplied wiring harness as it will require
splicing into the boiler manufacturer’s factory wiring. If you
choose to do so, be sure to check for correct polarity to pre-
vent equipment damage.
Hydrolevel offers a simple plug-in wiring harness
(Hydrolevel Part No. 45-348) which is available at leading
plumbing and heating distributors.
Step
➊
Step
➋
Hydrolevel Wiring Harness
Part No. 45-348
(available separately)
Model 1100 Instructions 8/13/03 2:52 PM Page 5