Danfoss Icon Master Guide D'installation page 22

Installation Guide
Application 0010: 4-pipe system with 2-way valves on supply pipes and automatic
change over for cooling controlled by a reference room thermostat.
Optional: Dewpoint sensor (recommended), circulation pump, heat demand signal and Global
standby.
Application description
4-pipe system with 2-way valves on supply pipes and automatic change over for cooling controlled by
reference room thermostat.
The system activates cooling mode via 2-way valves with thermal actuators on supply and return side by
activating the corresponding outputs (M1 - M4). Note: In this application outputs 1, 2, 3 & 4 on Danfoss Icon™
Master is used for the application and cannot be assigned to thermostats.
For cooling applications it is always recommended to have a dew point sensor installed in the system to
prevent moisture damage to floor and installations in cases where the relative humidty exceeds dew point.
Four conditions must be true before cooling in a room is allowed:
•
Reference room temperature must exceed the room setpoint + cooling hysterhesis.
•
No room has called for heating within neutral time.
•
The dew point sensor must not be active / no condensation risk present.
•
The room thermostat must be enabled for cooling (default = enabled).
The Global standby is a potential free input that can be used to remotely put the system in Global away
mode e.g. via an external 3rd party GSM module. When global standby input is active, all rooms receive a
15 degree celcius setpoint.
Settings
"SET 1" = Set desired cooling hysterhesis for change-over [+2 to +4K]
"SET 2" = Set neutral time that must pass without active heating or cooling, before change-over can be
activated [3-6 Hrs.]
APPLICATION
SETTINGS
22 | © Danfoss | FEC | 2018.12
Expansion Module for Danfoss Icon™ Master
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VIMDE20F / 088N2100
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