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ULTRAFORCE COMMERCIAL GAS WATER HEATER
INSTALLATION QUICK TIPS - SUF 199 AND 250 GAS PRESSURE
ADJUSTMENT PROCEDURE:
GAS PRESSURE
SUF 199 AND 250 MODELS
IMPORTANT NOTE
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
must not exceed a maximum of 10.5" w.c.
(295kPa) for natural gas, or 14" w.c. (3.45
kPa) for propane. The minimum supply gas
pressure is 4.8" w.c. (1.20 kPa) for natural
gas and 8.5" w.c. (2.12 kPa) for propane
gas."
Once the unit is installed and filled with water
and the inlet pressures confirmed, simply
turn the switch "on" and observe operation.
Cycle the unit "off" and "on" several times to
ensure proper operation.
State Water Heaters – Technical Training Department 6
SUF 120 thru 400 SERVICE HANDBOOK
Servicing should only be performed by a Qualified Service Agent
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
Gas Control with .230" LP Orifice
A supply gas pressure
(service regulator) must be installed on
the gas supply line within 10' (305 cm)
of the unit.
Ashland City, Tennessee © 2009
Venturi
Gasket
w/o orifice
Venturi
Gasket w/
LP Gas
Orifice
(.230"
Brass)
regulator
198152-002
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