Use and Care Manual

22
Guide for Functions
Simultaneous use for DHW and Heating
Outdoor Reset
This 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 Heating
will be decided by both the "Heating Set Temperature" and "DHW Set Temperature".
<Recommended Temperature Setting for using DHW and Heating at the same time>
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.
<Unsuitable Conditions>
• 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).
<DHW Priority>
When DHW/Space Heating Priority (Installer Mode [I:16_dHP]) is set to [2:dH].
(
) is lit on the Operation Panel, the
Outdoor Reset (Energy Saving) is enabled.
The Outdoor Reset Control feature may be
used to enhance energy efciency while
maintaining optimal heating performance.
With the Outdoor Reset Control, the heating
temperature setting automatically changes
according to the outdoor temperature and
the current heating system application.
The graph shows an example relationship
between Outdoor Temperature and Heating
Set Temperature.
* If the is lit (not ashing), then the Combi Boiler operates simultaneously DHW and Heating
automatically by increasing the heating supply temperature.
* Contact Noritz America for more information about simultaneous use for DHW and Heating.
Simultaneous Operation
DHW Priority (Operate solely)
DHW
ON
OFF
Heat
ing
ON
OFF
DHW
ON
OFF
Heat
ing
ON
OFF
200
(93)
(82)
(71)
(60)
(49)
(38)
(27)
(16)
(-12)
(-7) (-1) (4) (10) (16) (21)
(27)
180
160
140
120
100
80
60
10 20 30 40 50
Outdoor Temperature [°F (°C)]
Heating Set Temperature [°F (°C)]
60 70 80