RBI Boiler, Installation And Operation Instructions Manual

Page: 97 / 154

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14.6 - IB boiler
- Indirect water
heater temperature
adjustment
If the heater is installed to perform
double service (heating and domestic
hot water by an indirect water heater),
to control the indirect water heater
temperature you have to use keys
and . When the keys
are pressed, the display, item “N” in
Figure 14-1, shows the indirect water
heater setpoint being selected. The
range within which the indirect water
heater can be set is 104°F (40°C) to
140°F (60°C).
WARNING!!!
Water
temperature over 125°F (51°C)
can cause severe burns instantly
or death from scalds. Children,
disabled and elderly are at
highest risk of being scalded.
Feel water before bathing or
showering.
14.7 - IB boiler
- Heating
temperature
adjustment
The boiler supply hot water at the
temperature set by adjusting keys
or as shown in Figure
14-1. The room thermostat turns the
circulator pumps on in order to satisfy
the heat demand of the rooms controlled
by the thermostat. To maximize the
heaters’ performance, the heating
temperature, should be set at a value
that is just sufficient to maintain the
desired temperature of the rooms. As
the weather gets colder, progressively
increase the heating water temperature
by key . When the weather gets
milder turn the water temperature down.
- 2022 = “Winter supply temperature”.
Is the supply temperature
correspondent to the “Winter outdoor
temperature” (parameter 2021).
Suggested values are 104°F (40°C)
for fl oor radiant panels or 158°F
(70°C) for radiators heating systems.
- 2023 = “Spring outdoor temperature”.
Is the typical spring outdoor
temperature you want the heating
service to the minimum capacity.
Suggested value is 64°F (18°C).
- 2024 = “Spring supply temperature”.
Is the supply temperature
correspondent to the “Spring outdoor
temperature” (parameter 2023).
Suggested values are 86°F (30°C)
for fl oor radiant panels or 108°F
(42°C) for radiators heating systems.
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
outdoor temperature is higher than
parameter 2020 (“Warm weather
shutdown temperature”) the heating
service switches off. When the outdoor
temperature reduce below parameter
2020 (“Warm weather shutdown
temperature”), the heating service
switches back on. If, for some reason
the heating service doesn’t match the
load, using parameters 2022 (during
cold winter) and 2024 (during spring
season), to rise or lower the calculated
temperature and match the desired
room temperature.
14 - USE
14.8 - IB boiler
- Outdoor reset
adjustment
While in the “Installers’ Menu” (Section
14.14), set the 2003 parameter to
01. In this mode the heating supply
temperature, calculated temperature
in Figure 14-2, 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 Figure 14-2. 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.
14.8.1 - Outdoor reset
applications
Outdoor reset is a sophisticated way to
maximize comfort and boiler ef fi ciency.
When making adjustments to change
the supply temperature, it is advisable
to fi rst set the suggested default
values for the desired curve shown
in Figure 14-2. If these default values
do not produce a satisfactory result,
then proceed to make the appropriate
adjustments bearing in mind that:
A - each parameter must be very
gradually;
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;
14.8.2 - Outdoor reset:
setting parameters
Refer to Section 14.14 and set:
- 2020 = “Warm weather shutdown
temperature”. When the outdoor
temperature drops this value
the heating system is forced to
shutdown. Suggested starting value
is 72°F (22°C).
- 2021 = “Winter outdoor temperature”.
Is the design winter temperature
used for the basic heat load
calculation.