State Industries SUF-100-250, SUF-60-120 Features And Components, 120,000 & 150,000 Btu/hr MODELS

Features And Components

Basic Operation

The water heaters covered in this manual have a helical coil shaped heat exchanger that is submerged in the storage tank. The water heater’s Main Burner is a radial design burner, it is mounted on the top and fires downward through the heat exchanger. 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. See Figure 1 and Figure 2.

BLOWER

BURNER

ASSEMBLY

INTAKE AIR

(combustion air)

CONNECTION

3 INCH PVC

MAIN

BURNER

(radial design)

HEAT

EXCHANGER

HELICAL

COIL

VENT (exhaust)

OUTLET

Figure 1

Blower/Burner Assembly Detail

INTAKE AIR		COMBUSTION
(combustion air)		BLOWER
CONNECTION
3 INCH PVC
BLOWER
FLANGE
FLAME
SENSOR
MAIN
BURNER
(radial design)	HOT SURFACE
	IGNITER
120,000 & 150,000 Btu/hr MODELS
COMBUSTION		INTAKE AIR
BLOWER ASSEMBLY		(combustion air)
		CONNECTION
		3 INCH PVC
		BLOWER
		FLANGE
		HOT SURFACE
		IGNITER
FLAME		MAIN
		BURNER
SENSOR
		(radial design)
199,000 & 250,000 Btu/hr MODELS

Figure 2

Hot Surface Igniter

The control system energizes the Hot Surface Igniter with 120 VAC during the igniter warm up period. When the igniter is energized it produces sufficient heat, >1800°F (>982°C), to ignite the Main Burner.

Note: Care must be taken when handling the igniter to prevent breakage.

Flame Sensor

The control system also monitors the flame sensor to confirm a flame is present at the Main Burner. If a flame is not verified during the ignition trial period (3-5 seconds) the control system will immediately de-energize the 24 Volt Gas Valve. See the Sequence Of Operation Flow Chart on page 59.

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