INSTALLATION AND OPERATION INSTRUCTIONS
2-6
SFC BOILER / WATER HEATERS - SFC 199
2.5 ADDING DOMESTIC HOT WATER
STORAGE
2.5.1 Tankless Domestic Hot Water with a Storage
Tank
The SFC series unit has the ability to connect a domestic hot water storage tank
to the unit to provide larger volumes of domestic hot water during peak demands.
The storage tank is piped to the unit’s domestic hot and cold water piping
connections
(see B in Figure 31).
You must install a bronze or stainless steel
pump to circulate water from the storage tank through the unit’s domestic hot
water coil.
The pump to the optional junction box can be wired.
In this case, you can wire the pump and aquastat together without connecting to
the unit. When the line-voltage aquastat energizes the pump, the the flow sensor
detects the flow of domestic water and activates the water heater to heat to its
programmed temperature. The unit will switch off its internal pump.
2.5.2 Domestic Hot Water with an Indirect Tank Heater
You can connect the SFC series unit to an indirect tank. Connect the indirect
tank’s supply and return connections to the unit’s primary loop using a hydraulic
separator or closely-spaced tees
.
Properly sized piping must be installed. A
properly sized pump must also be installed between the unit and the indirect
tank.
The pump to the optional junction box can be wired.
2.6 SPACE HEATING
2.6.1 Overview
The SFC series unit is designed to be installed in a primary/secondary type
piping system. The unit comes complete with a factory-installed unit pump.
The pump is designed 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 circulate space heating water through
the heating system. The unit can operate a separate building pump (120V 1.0
AMP max).
There are various ways to zone a space heating system. Local wholesalers sell
control packages that offer easy methods to connect the zoning system to the
unit. See example piping and electrical drawings at
www.ibcboiler.com.
The unit supplies heat to the space using an outdoor reset line. With an
outdoor sensor installed, the unit automatically adjusts its space heating water
temperature based on the parameters programmed into the unit.
See separate
SFB/SFC controller manual for parameter information.
If the Outdoor sensor is
not installed, the unit uses the temperature set in the “User Set Up” menu “Boiler
Supply Temperature” to supply hot water to the space heating system.
NOTE
The correct 10KΩ temperature
sensor (or aquastat) must be
used to operate the indirect
water heater properly. If the
incorrect sensor is used
the domestic hot water may
overheat causing serious
injury or death.
