求翻译：4.换热机组主要配件均采用国内外著名品牌的高品质产品。换热机组工作在设计工况下，负荷平稳，低噪音，性能可靠，维修率低。是什么意思？

4 main components are made of heat exchanger unit of well-known brand of high quality products. Working conditions in the design of heat exchanger unit, the load stable, low noise, reliable performance, low maintenance.

4.substation main components are used in domestic and international famous brand high-quality products. substation work under tuned in design, load a smooth, low noise, low maintenance, reliable performance.

4. heat transfer unit major assembly uses the domestic and foreign famous brands the high quality product.The heat transfer unit work under the design operating mode, the load is steady, the low noise, the performance is reliable, the service rate is low.

4. heat exchanger unit main parts are made of high quality domestic and foreign famous brand products. Heat exchanger unit working under design conditions, load a smooth, low noise, reliable performance and low maintenance rate.

4 them. heat exchanger unit main parts adopt famous brand high quality products it. Heat exchanger unit working under design conditions, load a smooth, low noise, reliable performance and low maintenance rate.