SystemAir SAVE VTR 250/B Betriebs- Und Wartungsanleitung Seite 47

GB
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
• OAT — outdoor air duct temperature sensor
• RL — relay
• 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
• 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).
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Accessories |