Fan-coils are terminal units for room heating, cooling and ventilation that are widely
used in hotel buildings and, in general, in accommodation facilities such as guest houses,
residences, bed & breakfast and farm holidays.
Control with Ekinex
The application examples show two widely used system confi gurations. In the fi rst
example, the fan-coil units (1) are connected to a 2-pipe distribution system and in the
only exchange coil (3) circulates alternately warm or cold fl uid. The temperature of each
room is controlled by an EK-EP2-TP room thermostat (A) to which a window opening
contact (6) is connected. The EK-HO1-TP hotel module (B) controls the 3-speed fan and
the fl ow of heated or chilled water by means of the valve (2) with ON/OFF servomotor.
Connected to the hotel module (D) are a contact of the condensate drip tray (5), an EK-
STC-10K-3435 contact temperature sensor (D) and an EK-STI-10K-3435 immersion
temperature sensor (C) installed on the fl ow pipe of the heat transfer fl uid. The room
thermostat (A) allows the guest to manually change the desired temperature and
ventilation operation. If necessary, it is also possible to limit the temperature change
range to ± 3°C. Thanks to the bus connection, it is possible to switch the operating
mode (e.g. from standby to comfort) from reception when the guest arrives (check-in)
or earlier. In this application the switchover between heating and cooling can take place
automatically, by measuring the temperature of the conveying fl uid coming from the
boiler room by means of the immersion temperature probe (C) connected to a hotel
module input (B). Alternatively, Ekinex devices can receive the switching from the bus
(centralised manual switching).
Heating and cooling with fan-coils
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���������� 2
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BO1
BO2
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BO5
BO6
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BO10
EK-HO1-TP
Room Hotel Controller
BO4
V1
V2
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A
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COOL
BO9
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N
bus KNX
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AI1
BO1
AI2/BI2
BI3
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BI6
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BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
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N
bus KNX
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AI1/BI1
BO1
AI2/BI2
BI3
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BI6
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BI8
BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
Dev.
Line
Area
R
2
1
3
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T
A
B
D
���������� 1
T
C
BO1
BO2
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BO5
BO6
BO3
BO7
BO10
EK-HO1-TP
Room Hotel Controller
BO4
V1
V2
V3
T
A
E
H
8
O
B
COOL
BO9
L
N
bus KNX
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AI1
BO1
AI2/BI2
BI3
BI4
BI5
BI6
BI7
BI8
BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
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N
bus KNX
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AI1/BI1
BO1
AI2/BI2
BI3
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BI5
BI6
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BI8
BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
Dev.
Line
Area
R
Application example (2-pipe distribution system)
Ekinex devices
A) Room temperature controller EK-EP2-TP
B) Hotel module EK-HO1-TP
C) NTC temperature sensor (immersion) EK-STI-10K-3435
D) NTC temperature sensor (contact) EK-STC-10K-3435
Other components
1) Fan-coil unit
2) Valve with ON / OFF servomotor
3) Heat exchange battery
4) Fan group
5) Contact for condensate drip tray
6) Window contact
1
2
6
7
A
B
���������� 2
BO1
BO2
S
BO5
BO6
BO3
BO7
BO10
EK-HO1-TP
Room Hotel Controller
BO4
V1
V2
V3
T
A
E
H
8
O
B
COOL
BO9
L
N
bus KNX
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BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
L
N
bus KNX
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BI7
BI8
BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
Dev.
Line
Area
R
3
5
1
4
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6
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A
B
���������� 1
BO1
BO2
S
BO5
BO6
BO3
BO7
BO10
EK-HO1-TP
Room Hotel Controller
BO4
V1
V2
V3
T
A
E
H
8
O
B
COOL
BO9
L
N
bus KNX
3
4
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BO1
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BI7
BI8
BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
L
N
bus KNX
3
4
5
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8
9 10 11 12
13 14 15 16 17 18 19 20 21 22
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BO1
AI2/BI2
BI3
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BI5
BI6
BI7
BI8
BI9
COM
BI10
BI11
BI12
COM
0..10V
Com
Com
BO2
BO3
BO4
COMV
V1
V2
V3
12/24 Vac
BO5
HEAT
12/24 Vac
COOL
230 Vac 50/60 Hz
BO6
BO7
BO8
BO9
BO10
Dev.
Line
Area
R
3
5
4
Application example (4-pipe distribution system)
In the second example, the fan-coil units (1) are connected to a 4-pipe distribution
system. With this type of distribution, if both fluids are available from the boiler
room, there can be heated and cooled rooms in the same building at the same time
according to guests’ preferences or exposure. In the same room, it is also possible to
heat in the early morning and evening and cool during the central hours of the day.
The fan-coil units are equipped with two heat exchange batteries (3, 5) and a fan
unit with brushless motor controlled by an inverter board. The room temperature
is controlled by the EK-EQ2-TP room thermostat (A). The EK-HO1-TP hotel module
(B) has the 0-10V voltage output required to continuously control the fan speed;
it also controls the two valves with ON / OFF servomotor (2, 4) for the flow of
heated or chilled water. This configuration allows to obtain all the advantages of
these terminals: more precise response to the variation of thermal loads, greater
temperature stability, reduced noise and high efficiency even at partial load with
consequent reduction of electrical consumption.
Comfort and energy saving
In both cases utility functions for comfort, energy efficiency and maintenance of the
system can be added according to the needs of managers and guests of the facility.
Temperature reductions can be called up automatically when guests leave the room,
simply by removing the card from the EK-TH2-TP card holder (not shown in the
picture) which is part of the access control system; in other cases, the opening of a
window, detected by the contact (7) connected to an input of the room thermostat
(A), automatically switches the operating mode from comfort to building protection,
avoiding dissipating heating and cooling energy outside the building.
In the room example, the contact temperature sensor (D) on the heat exchanger
allows the fan (4) to be started only when the temperature of the conveying fluid
is comfortable for the guests (warm-start function). If the sensor is missing, the
function can also be carried out by setting a simple start-up delay.
If the fan-coil units are also used in high or voluminous rooms (such as the lobby,
restaurant or conference rooms) air stratification can occur, with energy waste and
discomfort for the occupants. To limit this effect, an additional temperature sensor is
connected to the room thermostat (A) and a maximum vertical temperature gradient
is set not to be exceeded.
The hotel module (B) has an operating hours counter that increases the count when
the fan (4) is at least in first speed. When the set time interval is reached, a signal is
activated for the replacement of the air filter, facilitating maintenance work.
Ekinex devices
A) Room thermostat EK-EQ2-TP
B) Hotel module EK-HO1-TP
Other components
1) Fan-coil unit
2) Valve with ON / OFF servomotor (warm fluid)
3) Heat exchange battery (warm fluid)
4) Valve with ON / OFF servomotor (cold fluid)
5) Heat exchange battery (cold fluid)
6) Contact for condensate drip tray
7) Window contact
HOTEL SOLUTIONS
HOTEL SOLUTIONS
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