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12 - USE
12.7 - Adjusting the
domestic hot water
temperature
The domestic hot water temperature is
adjusted by turning knob "11" shown in
fi gure 37. When the knob is turned, the
display, item "1" in fi gure 37, shows a
fl ashing
and the temperature being
selected. The range within which the
domestic hot water can be set is 104°F
(40°C) to 140°F (60°C) or from 104°F
(40°C) to 158°F (70°C) when an indirect
storage tank is used.
12.8 - Heating
system temperature
adjustment
The boiler provides hot water to the
heating system at the temperature
set by adjusting knob "7" as shown
in figure 37. The room thermostat
turns the boiler's circulator pump on
in order to satisfy the heat demand of
the rooms controlled by the thermostat.
To maximize the boilers' performance,
temperature knob "7", should be set at
a value that is just suffi cient to maintain
the desired temperature of the rooms. As
the weather gets colder, progressively
increase the water temperature by
adjusting knob "7". When the weather
gets milder turn the water temperature
down. This extremely simple method
is suitable for the following types of
systems:
1. small systems with radiators where
the thermostat is installed in a room
whose temperature is characteristic
of all the other rooms;
2. large systems with radiators, where
each zone is controlled by its own
room thermostat. Where zone valves
are used the boiler pump is shutdown
only when all the room thermostats
are satisfi ed.
3. large systems with low temperature
radiant panels , where each zone is
controlled by its own room thermostat.
Where zone valves are used the boiler
pump is shutdown only when all the
room thermostats are satisfi ed.
CAUTION!!! If the boiler
is installed in a low temperature
system follow the settings specifi ed
in section 5.9 or the heating system
may be damaged.
12.9 - Heating
system type
selection
The boiler is factory set for wall stat
control as per section 12.8.
The heating system type can be changed
by going to the "Installers' Menu" in
section 12.17 and changing the
parameter. One of the three following
heating modes can be selected:
-CH = 00 "Wall stat control": follow
section 12.8;
-CH = 01 "Outdoor reset control": follow
section 12.10 (an outdoor temperature
sensor is required);
-CH = 02 "Outdoor reset control with
room compensation control": follow
section 12.10 to 12.10.6 (an outdoor
temperature sensor is required):
12.10 - Outdoor
reset adjustment
While in the "Installers' Menu", set the
parameter to 01. In this mode
the heating supply water temperature,
calculated temperature in fi gures 38
and 39, will be adjusted automatically
based on the input from the outdoor
temperature sensor. The relationship
between the outdoor temperature
and the supply water temperature,
corresponds with the graphs shown in
fi gures 38 and 39. In order to change
the relationship between the supply
water temperature and the outdoor
temperature, all the parameters listed
in the sections below must be set.
46
12.10.1 - Outdoor
reset applications
Outdoor reset is a sophisticated way to
maximize comfort and boiler effi ciency.
It is suitable for the following system
types:
A - small systems, with radiators where
the thermostat is installed in a room
whose temperature is characteristic
of all the other rooms. The room
thermostat is used to turn the boiler
on and off.
B - Iarge systems, with radiators, where
each zone is controlled by its own
room thermostat. Where zone valves
are used the boiler pump is shutdown
only when all the room thermostats
are satisfi ed (see to an appropriate
electrical system).
C - small systems, with low tempera-
ture radiant panels where the
thermostat is installed in a room
whose temperature is characteristic
of all the other rooms. The room
thermostat is used to turn the boiler
on and off. In this type of system it is
necessary to consider that the radiant
panel systems sometimes have long
lag times. It may be necessary to
adapt the heating system and use the
"Reaction"
parameter in order
to compensate, see section 12.17.
D - Iarge systems with low temperature
radiant where each zone is controlled
by its own room thermostat. Where
zone valves are used the boiler pump
is shutdown only when all the room
thermostats are satisfi ed.
CAUTION! If the boiler is
installed in a low temperature
system, follow the settings specifi ed
in section 5.9 or the heating system
may be damaged.
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