ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
BLOWER SPEED CONTROL SUF 199 AND 250
The input of the SUF 199 and SUF 250 is determined by the blower. The input of the water heater may be determined by clocking the meter as shown on page 5 or by making sure the blower i s receiving the proper Hz signal. The blower rpm is controlled by the Central Control Board (CCB). The signal to the blower may be measured by attaching a MULTIMETER that has a Hertz (Hz) setting as shown in the illustration to the right. If the Hz signal is within +/
Meter black lead is connected to ground (not shown) and the red lead is connected to an open te rminal o n bl ower spee d con trol connection.
Model | Hz | Hz |
|
|
|
199 N | 133 | 87 |
|
|
|
250 N | 133 | 87 |
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199 LP | 200 | 156 |
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|
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250 LP | 266 | 96 |
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Note: R emoving the plug show n in the illustration will cause the blower to accelerate and the input of the water heater to increase to a much higher rate.
Meter red probe
connected to
open terminal on
plug
State Water Heaters – Technical Training Department 32 | Ashland City, Tennessee © 2009 |
Servicing should only be performed by a Qualified Service Agent |
