Riverside Works • Egmont Street • Mossley • OL5 9NETel. 01457 835700 • Fax. 01457 832700
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Some System Considerations Secondary Vent. Calorifiers can be supplied for open vented or unvented (sealed) systems. In open vented systems the vent pipe allows escape of air from the calorifier, ingress of air during drain-down, thermal expansion of water and (in the event of control failure) escape of steam from the calorifier. The vent pipe should never be blocked. No valves should be fitted to it except, where more than one calorifier share a common vent, special 3-way vent/bypass valves. These ensure that the calorifier is always open to atmosphere. << Back |