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Technical Literature Department 9 of 52 Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent
ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
OPERATION & SERVICE
HOW IT WORKS
This section of the Service Manual will cover operation, common service procedures and
water heater construction. The water heater covered in this Service Manual has a helical coil
shaped heat exchanger that is submerged in the storage tank. The water heater uses a top
mounted down fired radial 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.
COMBUSTION
AIR INTAKE
CONNECTION
EXHAUST/VENT
CONNECTION
INTERNAL VIEW
EXTERNAL VIEW
Starting at the top combustion air and
fuel gas are drawn in by the blower
(page 10) and Venturi (page 14).
The hot burning gases exit the radial
burner (page 11) and are forced
through the coil shaped heat
exchanger.
Flue gases spiral through the heat
exchanger and exit the water heater
through the exhaust/vent connection
at the bottom.
HELICAL
SHAPED
HEAT EXHNGER
BLOWER/BURNER
GAS VALVE
ASSEMBLY
COMBUSTION
AIR INTAKE
CONNECTION
EXHAUST/VENT
CONNECTION