HydroStat User Guide

4
NOTE: Settings can be checked using the
TEST/SETTINGS Button. See page 8 for details.
Setting the High Limit
The high limit is factory set at 190°F. To adjust, turn the HI
TEMP Dial

until the desired setting is displayed. (Setting
range: 100°-220°F)
Setting the Economy Feature
The Economy Feature is factory set for a 1 zone heating sys-
tem. To adjust, turn the ECONOMY Dial

until the number
displayed equals the number of heating zones. Do not include
indirect water heaters in the number of heating zones. The
Economy Feature conserves fuel by reducing boiler tempera-
ture (see “How Thermal Targeting Works” below). If the heating
system is unable to supply needed heat to the house, the
ECONOMY Dial should be turned to a lower setting (example:
In a three zone house, turn the dial to 2 or 1). Conversely, if
the boiler provides adequate heat, added fuel savings can be
achieved by selecting a higher setting (example: 4 or 5). If the
heating and indirect water heater signals were not separated
when wiring the control, the Economy Feature should be
turned OFF to ensure the boiler supplies adequate tempera-
ture to heat the indirect tank.
Program/Low Limit Dial
The Program/Low Limit Dial

can be used to enter the con-
trol’s programming mode to select optional features described
on pages 10-12 of this manual. At all other times it should be
rotated fully counter-clockwise in the OFF position.
NOTE: One of the features (described on page 12) enables
the dial to be programmed for use as a Low Temperature Limit
setting. This feature should only be activated for boilers
equipped with tankless coils used for domestic hot water pro-
duction.
SETTING THE CONTROL
Low Temperature
Limit Setting
(OFF or 110°-220°F)
Factory: OFF
High Temperature
Limit Setting
(100°-220°F)
Factory: 190°F
Spade Connectors
for OS-100 Outdoor
Sensor Kit
Diagnostic LEDs


Economy Dial
(OFF or LO, 1, 2, 3,
4, 5, HI)
Factory: 1
SETTING
Disables economy function. Will allow boiler to fire until hi-
limit temp is reached and re-fire with a 10° subtractive
differential.
Provides lowest level of fuel savings. Use this setting only if
the house does not stay warm at higher settings.
Recommended setting for single zone systems
Recommended setting for Two zone systems
Recommended setting for Three zone systems
Recommended setting for Four zone systems
Recommended setting for Five zone systems
Provides highest level of fuel savings
Indicator Light
(indicates heat call)
Test/Settings Button

Dynamic
Display
Water Temperature
and Real Time Verifi-
cation of Setting Ad-
justments.
Vent Damper Recep-
tacle*
Draft Inducer Recep-
tacle*
Differentials are automatic
and will vary based on
control settings and boiler
temperature.
Note: The high limit differential
can be adjusted when the econ-
omy feature is turned off. See
Optional Features on page 10.
*Model specific
HOW THERMAL TARGETING WORKS
Thermal Targeting technology analyzes thermostat activity and continually evaluates how much heat the house re-
quires. When it is very cold outside, the heat demand is high and the HydroStat IC will raise the boiler’s Target temper-
ature to provide needed heat to the home. When the outside temperature is milder, the heat demand is lower. During
these periods, the HydroStat IC will lower the boiler’s Target temperature – saving fuel – while continuing to provide
comfort to the house.