Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler - Manual (Page 80)

80
User Interface Display Explanation
CH Set
tings
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
Thermostat’ or 2, ‘Full Outdoor Reset’ boiler will adjust
CH set point proportional to outdoor temperature as
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 below based on outdoor temperature.
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)
1 0 0
A
C
D
APPENDIX A - CONTROL MODULE
A
B
D
C
80
100
120
140
160
180
200
220
0 20 40 60 80 100
Outdoor Temperature F
Supp
ly
T
em
pe
ra
tu
re
S
et
po
in
t
F
Reset Curve Design Points , A and B,
define a straignt line.
Boiler Min and Max, C and D, define a
section on the straignt line.
Boiler supply temperature Setpoint
follows the bold line sections
Outdoor Temperature °F
Suppy Temperature Setpoint
°F