11
USER’S INFORMATION MANUAL
SFC COMBI BOILERS
4.
To:
•
Save the changes, touch the Return button.
•
Exit without saving the changes, touch the On/Off button.
SPACE HEATING
The SFC series unit is designed to be installed in a primary/secondary type
piping system. The unit comes complete with a factory installed pump. The pump
is guaranteed to circulate heating system water through the unit’s heat exchanger
and primary loop piping only. The building’s distribution piping system may
require a dedicated pump or pumps to provide circulation of the space heating
water through the heating system. The unit can operate a separate building pump
(120V 1.0 AMP max).
Zoning of the space heating system can be accomplished many ways. Several
control packages are available from your local wholesaler and offer an easy
method of connecting the zoning system to the unit. Example piping and
electrical drawing are available at
www.ibcboiler.com
The unit supplies heat to the space using an outdoor reset line. With an outdoor
sensor installed the unit will automatically adjust its space heating water
temperature based on the parameters programmed into the unit.
See separate
publication SFC controller manual for parameter information.
If the outdoor
sensor is not installed, the unit will use the temperature set in the User Setup
menu “Boiler Supply Temperature” to supply hot water to the space heating
system.
SEQUENCE OF OPERATION
The unit operates in a similar way for both a space heating and a domestic
hot water call for heat. When the unit is powered up the controller enters a self
diagnostic mode and displays 2 in the Service Display.
The sequence of operation is as follows:
1.
The unit receives a call for heat from closing terminals X13.1 and X13.2
(24 volts section). The unit can also receive a call from domestic hot water
heating from the internal fl ow sensor, or from a 10KΩ sensor or aquastat
(X13.4 and X13.5 in 24V terminal).
2.
The unit does a safety check and energizes the fan for a pre-purge (
Service
Display = 3
).
