⚡Wiring Diagrams (Applications) & Operational Modes

Depending on the application you can choose different wiring schemes for the FCT (with respect to the Fan). This section will provide information on the seven possible schemes.

There is a total of 7 possible applications each with its specific wiring. They you can group them in 2 categories, depending whether you are utilizing a 3-speed or an ECM fan.

The two categories have very different wiring so it is advisable to examine the wiring diagram below in detail in order to choose the right application/wiring for your specific installation.

A summary can be found in the table below:

Application code	Fan Type	Description
00	1-3 speeds	2-pipe ON/OFF (220VAC)
01	1-3 speeds	2-pipe ON/OFF 3-wire valve (220VAC)
02	1-3 speeds	4-pipe ON/OFF 3-wire valve (220VAC)
03	ECM fan	4-pipe ON/OFF (220VAC)
04	ECM fan	2-pipe ON/OFF (220VAC)
05	ECM fan	2-pipe ON/OFF 3-wire valve (220VAC)
06	1-3 speeds	2-pipe ON/OFF (220VAC) Electric heater

Wiring Diagrams (Applications)

Note on Application 06

• It is intended for Fan Coil Units that have a build in heater that works in addition to the main pipe heating element in order to provide additional/more efficient heating.

• The Fan Coil Thermostat observes the Actual Fan Speed turns the heating element ON (via the relay circuitry), when the Fan Speed is MED or HIGH (an indication that a lot of heating is required).

• The Fan Coil Thermostat turns the heating element OFF when the observed Actual Fan Speed is LOW.

• There is a built-in back-off time mechanic, that leaves the Fan running for 1 minute after either the target temperature has been reached or the devices has been turned off. This allows the FAN to run a bit longer than it would have normally in order to cool the heating element and protect the system from overheating.

Wiring Diagrams (Applications)

You can change the applications with the following command set.

Application 06 is available only for devices with firmware version ≥ 1.9.

SET

You can set the target applications with the command:

Byte index	Hex value – Meaning
0	60 – The command code.
1	00: Application 0. Default value. 01: Application 1. 02: Application 2. ... 06: Application 6. This application is available only for devices with firmware version ≥ 1.9.

Example downlink: 0x6001 – 0x01: Sets the application 1.

GET

This command gets the application. The keepalive data in the example below is omitted for clarity.

Byte index	Sent request	Received response
0	61– Command code	61 – Command code
1		00: Application 0. 01: Application 1. 02: Application 2. ... 06: Application 6. This application is available only for devices with firmware version ≥ 1.9.

Example downlink sent by the server: 0x61;

Example command: 0x6101 – 0x01: Application 1.

Allowed Operational Modes

You can change the allowed operational modes with the following command set.

SET

You can set the allowed operational mode with the command:

Byte index	Hex value – Meaning
0	54 – The command code.
1	00: Ventilation/Heating/Cooling. Default value. 01: Ventilation/Heating. 02: Ventilation/Cooling.

Example downlink: 0x5401 – Sets the allowed operational mode to Ventilation/Heating.

GET

This command gets the allowed operating mode.

Byte index	Sent request	Received response
0	55 – Command code	55 – Command code.
1		00: Ventilation/Heating/Cooling. 01: Ventilation/Heating. 02: Ventilation/Cooling.

Example downlink sent by the server: 0x55;

Example command: 0x5501 – The allowed operating mode is Ventilation/Heating.

The keepalive data in the example above is omitted for clarity.

Change current operational mode

You can set/get the current operational mode with the following commands:

SET

You can set the operational mode with the command:

Byte index	Hex value – Meaning
0	52 – The command code.
1	00: Ventilation. Default 01: Heating. 02: Cooling.

Example downlink: 0x5201 – Sets the operational mode heating.

GET

This command gets the operational mode.

Byte index	Sent request	Received response
0	53 – Command code	53 – Command code.
1		00: Ventilation. 01: Heating. 02: Cooling.

Example downlink sent by the server: 0x53;

Example uplink sent by the device: 0x5301 – The current operational mode is heating.

The keepalive data in the example above is omitted for clarity.

Valve open/close time

This is applicable only to applications: 01 and 05

Feature for advanced users, use with care.

You can change the valve open/close time with the following command set.

SET

Set the valve open time.

Byte index	Hex value – Meaning
0	31 – The command code.
1	XX - Valve open/close time. Default value: 0xA0 (160 seconds).

Example downlink: 0x310F - Sets the valve open/close time to 15 seconds.

GET

Get the valve open time.

Byte index	Sent request	Received response
0	32 – Command code	32 – Command code
1		XX - Valve open/close time.

Example downlink sent by the server: 0x32;

Example command response: 0x320F – The valve open/close time time is 15 seconds.

Acceptable values: 1...255 seconds (1sec. resolution).