Hydrolevel OS-100 User Manual

MODEL OS-100

Outdoor Sensor Kit

for Model 3200-Plus and
Model 3250-Plus
Fuel Smart HydroStats

manufactured after 0/0/11

Kit Includes

• Outdoor Reset Sensor with 9-foot cable

• Sensor mounting bracket with 2 screws and 1 wire clip

• Two spade connectors

• Knockout wire bushing

WARNING

installing or servicing control. Only qualified personnel may install or service this control in
accordance with local codes and ordinances. Read instructions completely before proceeding.

This document provides instructions for connecting the Hydrolevel Outdoor Sensor Kit to an installed
Fuel Smart HydroStat control. For information on installing the HydroStat control, please refer to the
installation instructions provided with the control or log onto www.hydrolevel.com.

Electrical shock hazard. To prevent electrical shock, death or
equipment damage, disconnect power supply before

CAUTION

should be thoroughly cooled before installing or
servicing control.

To prevent serious
burns, boiler

Before installation, determine the
proper location for the sensor

• Sensor should be mounted on the
northern outside wall of the house,
shielded from direct sunlight.

• Sensor should be installed high
enough off the ground to protect
it from accidental damage or
drifting snow.

• Sensor should be installed away
from potential heat sources
such as exhaust fans, windows,
or doors.

83 Water Street • New Haven, CT 06511 • Phone [phone] • FAX [phone] • www.hydrolevel.com

1

INSTALLING THE SENSOR

STEP 1 Using the

two screws and wire
clip provided, attach
the sensor bracket to
the side of the house.

STEP 3 Using an extended wood

or masonry bit, drill a ¼" hole
through the side of the house at a
location giving the best access to
the boiler and the HydroStat control.

WARNING: Use caution to select
the hole location away from wires
or piping within the house wall.

WIRING

STEP 2 Secure the

sensor on the bracket by
pressing it down into the
slotted hole as shown
above.

STEP 4 Feed the sensor cable

through the hole and into the house.
Seal the hole with a bead of silicone
or other appropriate caulking
material.

STEP 5 Inside the house, route

the sensor cable to the HydroStat
control. Splice in an additional
length of wire as needed and, using
a crimping tool or pliers, terminate
with the two spade connectors pro­vided.

NOTE: To avoid interference with
the sensor signal, do not run the
sensor cable close to any other
wiring such as telephone, cable,
power, etc.

Locate the three quick connect posts on the HydroStat
circuit board. The sensor cable will plug into two of
these terminals depending on the features to be used.

OUTDOOR RESET AND
WARM WEATHER SHUTDOWN
Attach the spade connectors to the right and
center spade posts (OR and C) for full outdoor reset

functionality including warm weather shutdown protec­tion. Wiring this way overrides the Thermal Targeting
function of the Fuel Smart HydroStat control.

WARM WEATHER SHUTDOWN ONLY

Connect the wire ends to the left and center spade
connectors (WWSD and C) to add warm weather shut­down functionality only. When wired this way, the Fuel
Smart HydroStat control will utilize its internal Thermal
Targeting function to reset the boiler temperature.

2