This is generally an electrical heater. When the skin air gets to all-around 6*c (forty two.8F) the heater will come on and warmth the air up to safeguard the components within from frost. Normally this could freeze the heating and cooling coils within and burst them. Their components portfolio incorporates https://cristiankhcwn.slypage.com/32889964/5-simple-techniques-for-air-handling-units-ahus