Laars INDIRECT-FIRED Installation And Operating Manual

Contents

Laars INDIRECT-FIRED Installation And Operating Manual Manual pdf 17 page image

17Pre-installation continued-DOMESTIC HOT WATER PRIORITYTwo options are available, Priority and Non-Priority.1. Priority – Demand for space heating is interrupted or postponeduntil the domestic hot water demand is satisfied. This optionprovides maximum delivery of domestic hot water. Priority isrecommended when:a) Boiler net output is 100,000 Btu per hour or less, orb) When boiler output required to satisfy domestic hot waterdemand is at least 50% of the boiler output required to satisfyspace heating demand, orc) When an interruption in space heating can be tolerated during along domestic hot water draw.2. Non-Priority – Boiler output is divided between space heatingand domestic hot water heating. Delivery of domestic hot watercan be reduced during simultaneous space and domestic hot waterheating operations, depending on such factors as boiler output,boiler over-sizing, number of space heating zones calling for heat,and the ratio of domestic hot water load to space heating load.