Noritz NRCB199DV Owner's Manual

Also see for GHQ-C2801WX-FF US: Instructional manual Installation manual

Contents

22Guide for FunctionsSimultaneous use for DHW and HeatingOutdoor ResetThis Combi Boiler can operate DHW and Heating at the same time.However it can not operate in every conditions. The range of simultaneous use for DHW and Heatingwill be decided by both the "Heating Set Temperature" and "DHW Set Temperature".DHW temperature setting: 120°F(50°C in °C mode) or less.Heating temperature setting: 180°F(50°C in °C mode)*Higher Heating temperature is better.• Heating supply temperature setting is under 140°F (60°C in °C mode).• When DHW temperature setting is 140°F (60°C in °C mode).When DHW/Space Heating Priority (Installer Mode [I:16_dHP]) is set to [2:dH].( ) is lit on the Operation Panel, theOutdoor Reset (Energy Saving) is enabled.The Outdoor Reset Control feature may beused to enhance energy efficiency whilemaintaining optimal heating performance.With the Outdoor Reset Control, the heatingtemperature setting automatically changesaccording to the outdoor temperature andthe current heating system application.The graph shows an example relationshipbetween Outdoor Temperature and HeatingSet Temperature.* If the is lit (not flashing), then the Combi Boiler operates simultaneously DHW and Heatingautomatically by increasing the heating supply temperature.* Contact Noritz America for more information about simultaneous use for DHW and Heating.Simultaneous OperationDHW Priority (Operate solely)DHW ONOFFHeating ONOFFDHW ONOFFHeating ONOFF200(93)(82)(71)(60)(49)(38)(27)(16)(-12) (-7) (-1) (4) (10) (16) (21) (27)180160140120100806010 20 30 40 50Outdoor Temperature [°F (°C)]Heating Set Temperature [°F (°C)]60 70 80