Operating instructions

80
User Interface Display
Explanation
CH Settings
Allowed Range: 35°F to 100°F (2°C to 38°C)
Default Setting: 70°F (21°C)
If outdoor temperature is greater than Warm Weather
Shutdown Temperature, demand for CH blocked and pumps
stopped.
Allowed Boiler Range: 60°F to 195°F (40°C
to 91°C)
Default Boiler Setting:180° F (82°C)
Boiler capable of operating in Outdoor Reset Mode when
included Outdoor Sensor is connected and proper CH Mode
selected.
If CH Mode = 1, ‘Outdoor Temperature Reset with Thermo-
stat’ or 2, ‘Full Outdoor Reset’ boiler will adjust CH set point
proportional to outdoor temperature as dened by Outdoor
Reset Curve below.
Outdoor reset curve adjusted by modifying Design and Mild
Weather reference temperatures. See points A & B of Reset
Curve below.
Calculated CH set point always limited between ‘Reset Curve
Boiler Minimum/Maximum’ temperatures. See points C & D
of Reset Curve below.
Figure A-2 Outdoor Reset Curve
Calculated supply temperature follows thick black line in
graph above based on outdoor temperature.
25°F
170°F
20
180
200
160
140
120
100
80
60
40
60
100
70°F
A
D
C
B
Reset Curve
Boiler Minimum
Reset Curve
Boiler Maximum
Points
A
and
B
dene a
straight line. Boiler min. and
max.,
C
and
D
dene a
section on that straight line.
F°
C°
93
82
71
60
49
38
27
16
C°
F°
-6
4
16
38
21°C
21°C70°F
77°C
-4°C
Note:
• Modes only function when outdoor temperature sensor
connected.
• If ‘Open’ outdoor sensor detected CH set point equal to
‘Boiler Reset Curve Design’ temperature.
• Outdoor temperature used for CH set point calculation
measured once a minute and averaged with
previous measurement to compensate for rapid outdoor
temperature variations.
Allowed Min. Range: 40°F to 180°F (4°C to 82°C)
Default Min. Setting: 70°F (21°C)
Allowed Max. Range: 80°F to 195°F (27°C to 91°
C)
Default Max. Setting: 180°F (82°C)
B
Allowed Boiler Range: 35°F to 120 F (2°C to
49°C)
Default Boiler Setting: 100°F (37°C)
Allowed Outdoor Range: 35°F to 85°F (2°C to
29°C)
Default Outdoor Setting: 70°F (21°C)
100
A
C
D
APPENDIX A - CONTROL MODULE