UTICA BOILERS SSC UBSSC-075 Installation Operation & Maintenance page 81

User Interface Display
Allowed Range: 35°F to 100°F (2°C to 38°C)
Default Setting: 70°F (21°C)
Allowed Boiler Range: 60°F to 195°F (40°C
to 91°C)
Default Boiler Setting:180° F (82°C)
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)
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)
APPENDIX A - CONTROL MODULE
If outdoor temperature is greater than Warm Weather
Shutdown Temperature, demand for CH blocked and pumps
stopped.
Boiler capable of operating in Outdoor Reset Mode when
included Outdoor Sensor is connected and proper CH Mode
selected.
A
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 defi 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.
1 0 0
B
Figure A-2 Outdoor Reset Curve
Calculated supply temperature follows thick black line in
graph above based on outdoor temperature.
C°
93
82
77°C
71
60
C
49
D
38
27
21°C 70°F
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.
81
Explanation
F°
200 A
180
170°F
160
140
120
100
80
60
16
F° 20 40
4
C° -6
25°F
-4°C
A B
Points and defi ne a
straight line. Boiler min. and
C D
max., and defi ne a
section on that straight line.
D
Reset Curve
Boiler Maximum
Reset Curve
C
Boiler Minimum
B
60
100
16
38
70°F
21°C