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Accessories
10.3 Temperature control
10.3.1 Electrical duct pre-heater
Electrical pre-heater can be installed in the outdoor air duct to pre-heat outdoor air before it reaches the unit and pre-
vent icing in the heat exchanger.
• PH — electrical pre-heater
• ECT — extra controller temperature sensor
• H — contactor
• 1 — Outdoor air
• 2 — Supply air
• 3 — Extract air
• 4 — Exhaust air
Component/product — Article number:
• Duct temperature sensor (ECT) — 211524
• CB Preheater Connection Kit — 142852
• VSR 300:
CB 160-1,2 230V/1 Duct heater — 5291
• VSR 500:
CB 200-2,1 230V/1 Duct heater — 5384
Installation and connection
1. Install electrical pre-heater at least 100 mm distance from the unit in the outdoor air duct. Contactor is used to control
the pre-heater. Connect contactor it to any free digital output.
2. Connect pre-heater and the power supply to the contactor.
3. Connect extra controller temperature sensor (ECT) to any free analog input.
Fig. 12 Pre-heater connections
Configuration
1. Go to Service menu
2. Enter password (default 1111)
3. Go to Components menu, select Extra Controller menu and select mode as Preheater. Pre-heater setpoint
can be set in the same menu. Do other advanced settings if necessary.
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 connected. Example if it is connected to DO3 on the connection
board, then select DIGITAL OUTPUT 3 and select Step Controller Y4 Extra Controller from the output type
list.
5. Configure extra controller temperature sensor. Go back to Input menu. Select ANALOG tab. Select the analog input
to which the extra controller temperature sensor is connected. Example if it is connected to AI6 on the connection
211458 | A002
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