Installation and operation manual
5
4PW17551-1B
ECFWER6
Microprocessor controller for fan coils
The thermostat controls an electric heater as integration
or replacement of a hot water heating system.
When the operating mode selector switch is turned
to
and the electric heater is turned on, the fan runs
continuously at medium speed.
For safety reasons, the fan is turned off 2 minutes after
the electric heater is turned off, whether this occurs
when the desired air temperature is reached or when the
electric heater is turned off manually using the operating
mode selector.
The controller starts the unit according to the following
logic based on the water temperature that is detected by
a dedicated probe:
■
Water temperature <17°C: Cooling mode enabling
signal
■
Water temperature >37°C: Heating mode enabling
signal
In installations with electric heater control, the same
probe sends the enabling signal for the electric heater to
turn on according to the following logic:
■
Water temperature <37°C: Additional electric heater
enabling signal. (This enabling signal is sent only if
the operating mode selector switch is turned
to ).
■
Water temperature >39°C: The additional electric
heater is switched off.
Technical data and operation limits
Electric heater control
■
During operation of the electric heater, the
fan runs at medium speed only.
■
During heating operation of 2-pipe system
units equipped with an electric heater and
motorised valves, only the electric heater
works.
Fan coil enabling system based on the water
temperature
For switching based on water temperature, the
supplied water probe needs to be installed.
See "Position of the water temperature probe"
on page
11 for installation of the water
temperature probe.
Warehouse temperatures
–40°C~85°C
Operation temperatures
0°C~40°C
Accuracy of temperature probes
±0.5°C
Maximum current on terminal V1, V2
and V3 (fan speed)
1.1 A
Maximum current on terminal R and
V (valve and electric heater)
0.15 A
1B_I+OM_4PW17551-1B.book Page 5 Wednesday, October 5, 2005 9:18 AM
