USER’S INFORMATION MANUAL
10
DC/HC SERIES BOILERS
TANKLESS DOMESTIC HOT
WATER MODES
DC SERIES BOILERS ONLY
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.
(This the most energy efcient mode but will result in the “Cold Water Sandwich
Effect”.) The boiler will respond to a call for domestic hot water as a priority over
the space heating demand. When the domestic hot water demand is satised the
boiler will return to the space heating load if the load is still calling.
Comfort Mode (the top 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 is the least efcient mode but does offer the
most consistent hot water delivery temperatures). This temperature will be the
minimum temperature of the heat exchanger at all times unless the boiler is
heating a low temperature load.
ECO Comfort Mode (the bottom 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 boilers heat exchanger is allowed
to cool. (This mode is the most practical of the three options).
To toggle between the 3 modes simply press the Domestic Hot Water Comfort /
Eco button.
Table of Programmable Parameters
PARAMETER DESCRIPTION DEFAULT RANGE / OPTIONS
USER SET UP
Boiler Supply Temperature 180°F (82°C) 86°F (30°C) to 194°F (90°C)
Tankless Domestic Hot Water
Temperature
120°F (49°C) 104°F (40°C) to 149°F (65°C)
Table 2: Programmable Parameters
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