IBC SFC-99 Installation And Operating Instructions Manual page 82

This unit is equipped with a feature that saves energy by reducing the unit's water
temperature as the heating load decreases. This feature is equipped with an override
which is provided primarily to permit the use of an external energy management system
that serves the same function. THIS OVERRIDE MUST NOT BE USED UNLESS AT
LEAST ONE OF THE FOLLOWING CONDITIONS IS TRUE:
• An external energy management system is installed that reduces the unit's water
temperature as the heating load decreases.
• This unit is not used for any space heating.
• This unit is part of a modular or multiple unit system having a total input
of
300,000 BTU/hr or greater.
• This unit is equipped with a tankless coil.
US installers should contact IBC for any further information required.
IMPORTANT