059705–00 REV. B
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HYDRONIC HEATING
HYDRONIC HEATING FEATURES
SYSTEM TEMPERATURE OFFSET
The Offset value moves the starting point of the Reset Ratio curves. Therefore, any change made to the Offset will immediately
change the value of the Calculated system water temperature by the same amount. For example, if the Calculated system water
temperature were 150°F based on the specific outdoor temperature and Reset Ratio, then increasing the Offset from 0°F to 10°F
would increase the Calculated system water temperature to 160°F.
In a new installation, start with a Offset value of 0°. Adjust the Offset value in mild weather. If the ambient building temperature is
too warm in the warm weather, decrease the Offset. If the ambient building temperature is too cold in the mild weather, increase
the Offset. The rule of thumb for baseboard radiation is to change the Offset by 4°F for every 1°F degree you wish to change the
building temperatures. For radiant heat applications, change the Offset by 1° or 2° for every degree you wish to change the building
temperature. The Offset can be set from –40 to 40°F.
NIGHT (SLEEP) SETBACK
Whenever the Outdoor temperature (OD) falls below the Outdoor start (CUT), the system pump is activated and the Genesis
Heat-Timer
®
regulates the heating system to hold the Target Water temperature (TGT). As the Outdoor temperature (OD) changes,
the Genesis Heat-Timer
®
adjusts the actual water temperature (SYS) to hold a constant or Day (NORMAL) heat level. The Day heat
level is for when occupants are present and active.
The Genesis Heat-Timer
®
can also hold a lower or Night (SLEEP) setback heat level. This lower level of heat is for when the building
is unoccupied, or tenants are sleeping. The Genesis Heat-Timer
®
has the capability of programming (2) Day (WAKE/RETURN) and
(2) Night (AWAY/SLEEP) times for each day of the week. When the building comes out of Night (SLEEP) setting, there is an factory
default optional Boost setting to quickly bring the building up to comfortable temperatures.
BOOST AND EARLY SHUTDOWN
The Boost is designed to return the building to its Day (WAKE) heat level after Night (SLEEP) heat level. It does it by increasing the
temperature of the Calculated Water Temperature (TGT) by a set amount of degrees set by the Boost Adjustment for a period of
time that is based on outside temperature.
Early Shutdown is a feature that allows a building, usually commercial, to start Night Setback earlier than the last Night (SLEEP) schedule
setting for that day. The Genesis Heat-Timer
®
calculates the time period from the last Night (SLEEP) schedule setting for that day based
on Outdoor temperature (OD). The warmer it is outside the earlier the Genesis Heat-Timer
®
will shift to Night (SLEEP).
At 65°F Outdoor Temperature (OD) the Early Shutdown is the longest of 90 minutes. At 0°F Outdoor Temperature (OD) there is no
Early Shutdown or Early Shutdown is 0 minutes.
SYSTEM PUMP RUN-ON
This allows the Genesis Heat-Timer
®
to run the System Pump for a longer period of time after the boiler has been turned off. Consequently,
dissipating the excess heat from the boiler combustion chamber. That way the boiler should not over heat and activate its high limit.
SCHEDULES
•
By setting an operating Schedule and Night Setback, you can save energy while providing comfortable heat to the building.
The setting allows the Genesis Heat-Timer
®
to reduce Target temperature (TGT) by a specific number of degrees set by the
Sleep Setback during the night (SLEEP) or when building is unoccupied (AWAY), i.e. office buildings and schools.
•
During the day, Day Time (WAKE and RETURN) settings will change Target temperature (TGT) based on Outdoor temperature
(OD), Water Offset, Reset Ratio. A Night Time setting will reduce the Target temperature by the Night Setback number of
degrees. Each week day can has (2) Day (WAKE/RETURN) and (2) Night (AWAY/SLEEP) settings. Each schedule period can have
an individual desired building temperature setting.
NOTE
The BOOST and EARLY SHUTDOWN features are only accessible online through ICMS (Internet Control Management System).
