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Accessories GB
• CB 250-3,0 230V/1 Duct heater — 5385
• CB Preheater Connection Kit — 142852
Installation and connection
1. Install electrical pre-heater (ELH) at least 100 mm distance from the unit in the outdoor air duct. Relay (RL) is used to
control the pre-heater. Connect the relay to any free digital output on the connection board (CB).
2. Connect pre-heater (ELH) and the power supply to the relay (RL). A circuit breaker (BRK) is not included in the pack-
age and must be ordered separately. It must be installed in the circuit.
3. Install a duct temperature sensor (OAT) before the electrical pre-heater on the outdoor side of the unit and connect it
to any free Analog Input on the connection board (CB).
Fig. 15 Pre-heater connections
Configuration
1. Go to Service menu
2. Enter password (default 1111)
3. Go to Components menu, select Extra Controller menu and set Extra Controller Mode setting as Pre-
heater. Pre-heater setpoint can be set in the same menu. Do other advanced settings if necessary. Read “Installa-
tion and Service” manual for more information.
4. Configure connection of the pre-heater. Go to Service menu. Select Output menu. In next menu select DIGITAL
tab. Select the digital output to which the pre-heater is connected. Example if it is connected to DO3 on the connec-
tion board, then select DIGITAL OUTPUT 3 and select Step Controller Y4 Extra Controller from the output
type list.
5. Configure internal outdoor temperature sensor as extra controller temperature sensor. Go to Service menu. Select
Input menu. Select ANALOG tab. Select the ANALOG INPUT 1 and change its configuration from Outdoor Air Tem-
perature Sensor (OAT) sensor to Extra Controller Temperature Sensor (ECT).
6. After sensor configuration is changed select the Analog Input to which the newly installed duct temperature sensor
(OAT) is connected and configure it as Outdoor Air Temperature Sensor (OAT).
11.3.3 Internal water heater
A water heating battery can be installed inside the unit and connected to water system.
211480 | B003
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