What is a recommended practice when using a blast coil to heat outdoor air supply?

Turning on the steam and allowing for a warm-up period before opening the dampers is a recommended practice when using a blast coil to heat outdoor air supply. This approach ensures that the air passing through the coil is adequately heated before being distributed throughout the space. If the dampers are opened too soon, cold air can be introduced into the system, which can result in an uncomfortable indoor environment and put unnecessary stress on the heating system.

By allowing the steam to circulate and warm the coil first, it helps achieve a more consistent temperature rise in the air being heated. This method also promotes system efficiency, as the coils will be operational at an optimal temperature before cold air is mixed into the system. Consequently, this practice minimizes the risk of condensation or other operational issues that may arise from introducing cold air to the heating system too soon.