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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 24 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
CONTROLS – GAS VALVE SUF 199 and 250
ADJUSTMENT PROCEDURE:
GAS PRESSURE
SUF 199 AND 250 MODELS
THE SUF 199 AND 250 MODELS
INCORPORATE A NEW GAS CONTROL,
WHICH OPERATES AT A MANIFOLD
PRESSURE OF 0"W.C. (0 kPa) FOR BOTH
NATURAL AND PROPANE GAS. SEE THE
GAS PRESSURE CHART ON PAGE 4.
THESE MODELS ARE CONFIGURED
PRIOR TO BEING SHIPPED FROM THE
FACTORY AND NO ADJUSTMENTS ARE
NECESSARY PRIOR TO STARTUP. THE
CONTROLLER MONITORS THE AIR FLOW
AND MAKES ADJUSTMENTS TO THE FAN
SPEED WHICH IN EFFECT CONTROLS
THE AMOUNT OF GAS FLOW.
THEREFORE, THE UNIT WILL SELF
ADJUST TO ACQUIRE THE CORRECT
AMOUNT OF INPUT.
Supply gas pressure to the water heater for
natural gas should be between a maximum
of 10.5" (2.59kPa for natural gas) W.C.
(14.0"/3.45kPa for propane) and a minimum
as shown on page 4: that is, for Natural Gas
4" (.98kPa) W.C. And 9.0" (1.97kPa) for
Propane Gas. The inlet gas pressure must
not exceed the maximum value.
Once the unit is installed and filled with water
and the in let p ressures c onfirmed, s imply
turn the switch "on" and observe operation.
Cycle the unit "off" and "on" several times to
ensure proper operation.
HIGH ALTITUDE INSTALLATION
The SUF 199 and 250 models are suitable
for installation up to 10,100 feet above sea
level with no adjustments.
GAS ORIFICE
The SUF 199 and 250 models do not have a
natural gas orifice. A .230” orifice is used on
LP gas models.
Gas Control Without Orifice
Natural Gas
Venturi
Gasket
w/o orifice
Gas Control with .230” LP Orifice
Venturi
Gasket w/
LP Gas
Orifice
(.230”
Brass)
IMPORTANT NOTE
A supply gas pressure regulator
(service regulator) must be installed on
the gas supply line within 10' (305 cm)
of the unit.