Operation And Service; How It Works - State Water Heaters 120 Series Service Handbook

how it worKs

This section of the manual will cover operation, common service procedures and water heater construction.
The water heater covered in this manual has a helical shaped coil heat exchanger that is submerged in
the storage tank. These water heaters use a top mounted down fired radial design Burner. This is a forced
draft burner; hot burning gases are forced through the heat exchanger under pressure and exit through the
exhaust/vent connection located at the bottom of the water heater.
Starting at the top air and fuel gas are drawn in by the Combustion Blower and Venturi, see Combustion
Blower on page 11 and Venturi on page 22. Flue gases and are forced through the helical shaped heat exchanger
by the Combustion Blower and out through the exhaust/vent outlet, see Figure 6 below.
BLOWER/BURNER
GAS VALVE
ASSEMBLY
ARROWS SHOW
PATH OF FLUE
GASES THROUGH
THE HEAT
EXCHANGER
10

OPERATION AND SERvICE

INTERNAL VIEW
Figure 6
Servicing should only be performed by a Qualified Service Agent
COMBUSTION
AIR INTAKE
CONNECTION
HELICAL SHAPE
HEAT EXCHANGER
EXHAUST/VENT
OUTLET