Systemair HWC, FR1600, Hydr. Pre-heat - Hot-water pre-heater

Pre-heater Topvex FR-TR The pre-heater is an option and can be ordered as an accessory, to be installed inside the FR or TR unit. For proper operation, the correct indoor conditions must also be met. The common ambient indoor temperature for the winter season is 72°F (22°C) with 30-40% RH. Operating outside of that range may result in condensation of the casing and a considerable reduction in airflow. A frost pretection sensor is fitted to reduce the risk of damage from freezing.