{"id":303,"date":"2021-02-11T19:09:03","date_gmt":"2021-02-12T00:09:03","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/basichvac\/?post_type=chapter&p=303"},"modified":"2021-03-24T11:21:26","modified_gmt":"2021-03-24T15:21:26","slug":"unit-heaters","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/basichvac\/chapter\/unit-heaters\/","title":{"raw":"Unit Heaters","rendered":"Unit Heaters"},"content":{"raw":"Click play on the following audio player to listen along as you read this section.\r\n\r\nhttps:\/\/video.bccampus.ca\/id\/0_274ev4tu?width=608&height=70&playerId=23448552\r\n\r\n[pb_glossary id=\"698\"]Unit heaters[\/pb_glossary]<\/strong> are often installed at ceiling height or recessed into a wall, and consist of a heating element, a built in blower fan and louvers to direct the direction of heated airflow. They are small and compact in size, yet have a high capacity for heating a room or area.\r\n\r\nIf a single unit heater is to be installed, its heated airflow should be directed towards the area of highest ambient heat loss, such as a window or door, however care should be taken to make sure that no surface is heated beyond a safe level.\r\n\r\nIf multiple unit heaters are installed their air flow should be directed in a circular motion along the exposed outer walls.\r\n\r\nControl of unit heaters is similar to that of baseboard heaters, in that there must be a temperature activated switch, either installed directly on the heater unit, or more effectively, in another part of the room. A built-in fan switch is also provided to allow the fan to circulate air during warm weather without energizing the heater elements.\r\n\r\nUnit heaters are available anywhere from 2 kW to 60 kW, with units on the lower side, up to approximately 5 kW usually being single-phase AC and controlled by low-voltage thermostats and relays, while units rated above 5 kW are usually three-phase.","rendered":"

Click play on the following audio player to listen along as you read this section.<\/p>\n

https:\/\/video.bccampus.ca\/id\/0_274ev4tu?width=608&height=70&playerId=23448552<\/p>\n

Unit heaters<\/a><\/strong> are often installed at ceiling height or recessed into a wall, and consist of a heating element, a built in blower fan and louvers to direct the direction of heated airflow. They are small and compact in size, yet have a high capacity for heating a room or area.<\/p>\n

If a single unit heater is to be installed, its heated airflow should be directed towards the area of highest ambient heat loss, such as a window or door, however care should be taken to make sure that no surface is heated beyond a safe level.<\/p>\n

If multiple unit heaters are installed their air flow should be directed in a circular motion along the exposed outer walls.<\/p>\n

Control of unit heaters is similar to that of baseboard heaters, in that there must be a temperature activated switch, either installed directly on the heater unit, or more effectively, in another part of the room. A built-in fan switch is also provided to allow the fan to circulate air during warm weather without energizing the heater elements.<\/p>\n

Unit heaters are available anywhere from 2 kW to 60 kW, with units on the lower side, up to approximately 5 kW usually being single-phase AC and controlled by low-voltage thermostats and relays, while units rated above 5 kW are usually three-phase.<\/p>\n

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