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2.7.3
Water heating with ICM cascade systems
Hot water tanks can be connected hydraulically and
electrically directly to a boiler (heating boiler model).
• Water heating is controlled by the boiler. During a
DHW demand, this boiler will not be called by the ICM
module for space heating. In case of demand, another
boiler may be started.
• If water heating is timed using the Hydronic 3 boiler
with the storage tank must be connected to the ICM
module (master) via terminals 17 and 18.
NOTE:
B If the user wants to prepare hot water
using the 3-way valve of the boiler and he
wants to continue supplying the heating
zone, he must switch off the warm water
priority on the FW200 for all heating
zones since with the factory settings, hot
water priority is active by default.
2.7.4
Internal frost protection function
The ICM module is equipped with an internal frost
protection function: if the supply temperature falls
below 45 °F (7 °C), a boiler starts and runs until a supply
temperature of 60 °F (15 °C) has been achieved. Any
heating pump that is connected to the ICM module will
also run (
chapter 3 2.7.5).
B Connect the supply temperature sensor to the ICM
master module if the internal frost protection function
is required.
NOTE:
B The frost protection function of the
Hydronic 3 provides comprehensive
system frost protection. This requires the
connection of an outdoor temperature
sensor.
Details about the ICM module | 7
2.7.5
Control of one heating pump
In heating systems with only one heating zone, the
heating pump can be connected directly to the ICM
module (master).
The heating pump runs:
• as long as at least one boiler pump is running (if
required, set the pump run-on time on the boiler
accordingly
boiler installation instructions); or
• briefly after remaining idle for 24 hours (anti-seizing
protection).
NOTE:
B The anti-seizing pump protection lets the
heating pump run at least once every day
even without a heat demand (e.g. during
summer).
B Leave your heating system switched on
all year to prevent the pump (in summer)
from seizing up.
2.7.6
External switching contact
The ICM module is equipped with an external switching
contact (
fig. 6, [G]). For the characteristics of this
switch, see
table 2, page 5.
This external switching contact can be used optionally,
e.g. to connect a temperature switch for protecting the
radiant floor heating against a too-high water
temperature.
If the switching contact is opened, all boilers are
switched off via the ICM module. As soon as the
switching contact is closed again, the boilers are ready
for operation again.
2.7.7
System versions overview
As a manufacturer of advanced heating technology, we
give high priority to the development and manufacture of
economical and clean-burning boilers. To guarantee this,
our boilers are equipped with modulating burners. To
make optimum use of the burner characteristics,
Hydronic 3 controls should be used.
6 720 643 835 (2011/06)
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