How to Control a Steam-Heat Exchanger

Turn on the radiators in each room. Every radiator has a valve that can be opened or closed, depending on the season. In warm months it should be closed, and in winter it should be open.

Check the valve you previously opened. If you hear a hiss, it may be that the nut that's part of the valve has loosened. Tighten the nut with your wrench and see if the hissing stops. Do not over-tighten the nut; otherwise, you may not be able to turn the valve when you need to.

Look for the bleeder valve and check it. Often, the bleeder valve looks like a wing nut on a screw. The bleeder valve allows the system to be evacuated when it's not in use or being repaired. Also, when you open the system for heat at the beginning of winter, you need to get the air out of the radiator. All you have to do is open the bleeder valve and listen for the hiss. When the hiss disappears and you start to see water, the radiator is free of air. After the air has been evacuated from the system, close the bleeder valve.

Control the amount of heat allowed into the room. By partially closing the valve on the radiator, you can lessen the amount of heat coming into the room. If you want it warmer, open the valve more to allow a higher volume of steam to run through the radiator.