Instruction manual

46
12 - USE
proceed to make the appropriate
adjustments bearing in mind that:
A - each parameter must be set in
small degrees;
B - after each parameter change, wait
at least 24 hours in order to see the
result;
C - the closer the adjustment curve
matches the actual load of the
building, the greater the comfort and
the energy savings will be;
D - knob “33” in figure 1 can be used to
make the small line shifts, “b”,
shown in figures 40 and 41. These
shifts will move the line in
increments of approximately 1 °F (1
° C), up to 18 °F (10 ° C).
12.4.3 - Climatic
adjustment: setting
parameters
Refer to section 12.10 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 tempera-
ture 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
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;
176 °F (80 ° C) for “high temperature”
systems.
Refer to section 12.11and set:
- = “Reaction” of the calculated
temperature with respect to the
outdoor temperature input. The range
of adjustment is between 1 °F (1 ° C)
and 18 °F (10 ° C). A low “Reaction”
value results in a constant dwelling
temperature but extended time in
reaching full running conditions and
responding to outdoor temperature
changes. A high “Reaction” value
results in reaching full running
conditions quickly, but also possible
oscillations in the dwelling
temperature.
It is advised to maintain a “Reaction”
value between 1 and 2;
- = “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.
12.4.4 - Climatic
adjustment: 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 outside temperature
for the calculation of the heat
requirement is 23 °F (-5 ° C). In the
event that the climatic zone is different,
adjust the gradient of the curve,
parameter , to obtain a
calculated temperature of 176 °F (80
° C) for high temperature systems, see
Figure 40. For “Low Temperature”
systems adjust the gradient of the
curve, parameter , to obtain a
calculated temperature of 113 °F
(45 ° C), see Figure 41.
12.4.5 - Climatic
adjustment
activation
Once selected, climatic 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 “33” in figure 1, to raise or
lower the calculated temperature and
match the “Minimum heating
temperature” on an advanced or
delayed basis.
12.4.6 – Climatic
adjustment with
room
compensation
While in the “Installers’ Menu” set the
parameter to 02, see section
12.11. The system will function exactly
as described in the previous “Climatic
adjustment” sections except that now
the boiler pump will stay on
permanently. The opening of the room
thermostat contacts will translate into
a parallel downward movement of the
curve in figure 40 or 41. The value by
which the curve moves downwards can
be adjusted by the parameter
present in the “Installers’ Menu”, see
section 12.11. The parameter
can range from 1 °F (1 ° C) to 36 °F,
(20 ° C). The suggested values for this
parameter are:
- 18 °F (10 ° C) for high temperature
radiator systems;
- 6 °F (3 ° C) for low temperature radiant
panel systems
Values of this parameter that are too
high may translate into room
temperature instability. Values that are
too low may make the action of the
room thermostat ineffective. Climatic
adjustment with room compensation
can be used in all the systems
described in section 12.4.1. The
advantage being that the constant
running of the pump will stabilize and
standardize the room temperatures.
This is especially true when some
loops in the heating system have
considerably greater volume than
others.