Published at Monday, March 25th, 2019 - 02:18:00 AM. wiring. By Odile Cohen.
The book also includes end of section review questions and exercises that can be torn out and handed into the instructor for grading. A separate instructor supplement containing the answers to the end of section exercises is also available.
Hot water systems are used mostly in the Northeast. They are very versatile, and can be used to economically zone different parts of a building. As with the steam boiler and hot air furnace, these systems also have a flue damper, spill switch, and rollout switch. We are going to discuss a forced hot water system, meaning that there is a pump to circulate the water in the system. Most package boilers come with a combination aquastat/circulator relay control; 120 V is brought into the control to terminals L1 and L2. The thermostat is brought to terminals T1 and T2, the circulator is connected to terminals C1 and C2, and terminals B1 and B2 power the gas valve. When the thermostat calls for heat, it closes terminals T1 and T2.
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