ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
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.
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.
Venturi
Gasket
w/o orifice
Gas Control Without Orifice
Natural Gas
Venturi Gasket w/ LP Gas Orifice (.230” Brass)
Gas Control with .230” LP Orifice
A supply gas pressure | regulator |
(service regulator) must be installed on | |
the gas supply line within 10' (305 cm) | |
of the unit. |
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State Water Heaters – Technical Training Department 6 | Ashland City, Tennessee © 2009 |
Servicing should only be performed by a Qualified Service Agent |
