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USRA 2-8-8-2 Steam Engine Operating Instructions
Adjusting Chuff Rate
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Reset Feature 27 - (5 Clanks, 2 Clinks)
Reset Feature 27 allows the operator to “fine tune” the rate of chuff relative
to the speed of the engine by setting the minimum and maximum chuff
points. To do this with the MTH Z-4000, follow the steps below:
1. With the steam engine on the track, and the transformer throttles in the
“OFF” position, press the “PROGRAM” button for the track in use. The
display will read “00” and “PG”.
2. Using the “WST/HRN” button, scroll the top display up to “27,” then
press “BELL SELECT.” The transformer will power the engine in Reset,
and run the Proto-Sounds® to Reset Feature 27 (5 Clanks, 2 Clinks).
3. Raise the throttle from the “OFF” position and press the “PROGRAM”
button. This will release the transformer from the Program Mode without
the engine leaving Reset Feature 27.
4. With the throttle set low, press the “WST/HRN” button. You will hear a
single bell, and the engine will begin to move forward with no chuff.
5. Reduce the throttle until the engine just stalls , and press “WST/HRN.”
You will hear a double bell. This is the motor speed where the chuff will
begin.
6. Raise the throttle until the engine is running at the speed that you want
the chuff to be the fasteset, and press “WST/HRN”. You will hear 3 bells,
and the engine will stop.
7. Bring the throttle to the “OFF” position to complete the Reset Feature.
Test the settings by running the engine. You may need to repeat the
procedure to further adjust the thresholds. And remember you can always
return to the Default Settings by using Reset Feature 18.
NOTE: Special note for steam engines only. Once you have reached reset
18 you have two options. Option 1 resets all the reset features except for
reset feature 27 (Chuff Rate) back to the default setting. Option 2 resets all
reset features back to the default setting. For Option 1, press the
horn/whistle button once after you have heard the 3 clanks and 3 clinks this
will reset all the reset features except reset 27 (Chuff Rate) back to the
factory settings. For Option 2, press the horn/whistle button again you
have now reset the remaining reset feature 27 (chuff rate) back to the
factory setting. All the reset features now have been set back to the factory
settings
.
