Slant/Fin VSL-160C Part B - Manual (Page 36)

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13 - USE
13.10.3 - Outdoor reset:
setting parameters
Refer to Section 13.16 and set:
- = “The angle of the curve”,
which can be adjusted between
0.1 and 5.0. Suggested
starting values are: 0.6 for “low
temperature” systems; 1.6 for
“high temperature” systems;
- = “Minimum heating tempera-
ture”. When the calculated
temperature drops below this
value the heating service stops.
The range of adjustment is
between 68 °F (20 °C) and
140 °F (60 °C). The suggested
starting values are: 86 °F
(30 °C) for “low temperature”
systems; 104 °F (40 °C) for
“high temperature” systems;
- = “Maximum heating
temperature”. This parameter
is the high limit of the supply
heating temperature. Its range
of adjustment is between 86
°F (30 °C) and 194 °F (90 °C).
The suggested starting values
are: 113 °F (45 °C) for “low
temperature” systems or 176 °F
(80 °C) for “high temperature”
systems.
Refer to Section 13.17 and set:
- = This parameter must always
be at value of 1.
- = “Fix point” is the heating
calculated temperature, when
the outdoor temperature is
68 °F (20 °C). It is called “Fix
Point” because it is also the
angle fulcrum of the curve.
The suggested starting values
are: 92 °F (33 °C) for “low
temperature” systems 122 °F
(50 °C) for “high temperature”
systems.
13.10.4 - Outdoor reset:
zone adjustments
The default values previously
suggested are for boilers using an
outdoor temperature sensor installed
in dwellings with average heat loss in
areas where the design outside winter
temperature is 23 °F (-5°C). In the
event that the climatic zone is different,
adjust the parameter , to obtain
a calculated temperature of 176 °F (80
°C) for the typical design outside winter
temperature, see Figure 13-2.
13.10.5 - Outdoor reset
activation
Once selected, reset adjustment is
completely automatic and will switch
off at the end of the heating season
and switch back on at the beginning
of the heating season. When the
“Calculated temperature” is lower than
the “Minimum heating temperature”,
(parameter ), the heating service
switches off. When the “Calculated
temperature” exceeds the “Minimum
heating temperature” (parameter
) , the heating service switches back on.
If for some reason the heating service
doesn’t match the load, use knob “7”
in Figure 13-1, to raise or lower the
calculated temperature and match the
“Minimum heating temperature” on an
advanced or delayed basis.