Tankless Domestic Hot Water Modes; Adding Domestic Hot Water Storage; Comfort And Eco Comfort Modes; Tankless Domestic Hot Water With A Storage Tank - IBC DC Series Installation And Operating Instructions Manual

2.4
2.5
2-4
DC SERIES BOILERS / WATER HEATERS DC 15-95, DC 15-96, DC 20-125, DC 33-160
TANKLESS DOMESTIC HOT WATER
MODES
2.4.1 Tankless Domestic Hot Water - Standard,

Comfort and ECO Comfort Modes

Standard Mode (both LEDs are off): The boiler's heat exchanger will not
maintain its domestic hot water temperature between demands for hot water. The
boiler / water heater will respond to a call for domestic hot water as a priority over
the space heating demand. When the domestic hot water demand is satisfied the
boiler / water heater will return to the space heating load if the load is still calling.
Comfort Mode (the bottom LED is on): The boiler's heat exchanger will
maintain the pre-programmed temperature set in parameter n. or as set for
the Tankless hot water temperature. This temperature will be the minimum
temperature of the heat exchanger at all times unless the boiler / water heater is
heating a lower temperature load.
ECO Comfort Mode (the top LED is on): This mode operates like the Comfort
Mode but has the added advantage of learning when the domestic hot water is
used. During the low use periods the boiler /water heater's heat exchanger is
allowed to cool.
To toggle between the 3 modes simply press the Domestic Hot Water Comfort /
Eco button.
ADDING DOMESTIC HOT WATER
STORAGE
2.5.1 Tankless Domestic Hot Water with a Storage
Tank
The DC series boiler / water heater has the ability to connect a domestic hot
water storage tank to the boiler / water heater to provide larger volumes of
domestic hot water during peak demands.
The storage tank will be piped to the boiler's domestic hot and cold water piping
connections (see Figure #30 on Page 1-30). A bronze or stainless steel pump
must be installed to circulate water from the storage tank through the boiler's
domestic hot water coil. The pump and the tank aquastat can be wired directly to
the boiler's control for ease of installation.
Alternately, the pump and aquastat can be wired together without connecting to
the boiler / water heater. When the pump is energized, the flow of water through
the domestic hot water coil in the boiler / water heater will be sensed by the flow
sensor and activates the boiler / water heater. The boiler / water heater will switch
off its internal pump and operate at its programmed water temperature.
INSTALLATION AND OPERATION INSTRUCTIONS