Combination furnace/water heater system

Heating · Combination Furnaces · printed page 136 (PDF page 137)

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Book index entries

Combination Furnaces Combination Furnace/Water Heater System Furnace/Water Heater System – Combination

Text in the illustration

an air conditioning coil is sometimes installed in the air handler to provide cooling during the warmer months
thermostat
supply plenum
air flow
furnace coil
water flow
air return
blower
hot
cold
pump
filter
fan coil unit
gas water heater (high efficiency) (large capacity)

Generated explanation

The diagram shows a combination space-heating and domestic hot-water system using a large-capacity, high-efficiency gas water heater connected to a fan coil unit. A pump circulates heated water from the tank through the furnace coil, with arrows indicating the supply and return water paths. Return air enters the bottom of the air handler through a filter, passes the optional air-conditioning coil and blower, and flows through the heating coil into the supply plenum. A thermostat is shown with control wiring to the blower and pump. The water heater also has labeled cold-water inlet and hot-water outlet connections.

Components

gas water heater fan coil unit furnace coil circulation pump blower air filter air-conditioning coil return air duct supply plenum thermostat control wiring water piping shutoff valves water heater vent

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