Accessories
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12.3 Temperature control
12.3.1 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:
• CB 125-1,2 230V/1 Duct heater — 5290
• Duct temperature sensor (ECT) — 211524
• CB Preheater Connection Kit — 142852
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. 13 Pre-heater connections
Configuration
1. Go to Service menu
2. Enter password (default 1111)
211473 | A001
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