Alpha Technologies AlphaGen DCX2000 - Operator's Manual - Manual (Page 16)

16 041-135-B0-001 Rev. A (07/2013)
2.0 Operation, continued
2.6 Operation at High Altitude
The standard carburetor air-fuel mixture will be excessively rich at high altitudes. This will decrease
performance and increase fuel consumption.
High altitude performance can be improved by installing a smaller diameter main fuel jet in the carburetor.
If you always operate the generator at altitudes higher than 5000 feet (1500 m) above sea level, have an
authorized Alpha Service Center install a high altitude main jet.
Even with suitable carburetor jetting, engine horsepower will decrease approximately 3.5% for each 1000
feet (305 m) increase in altitude. The affect of altitude on the horsepower will be greater than this if no
carburetor modification is made.
Have any carburetor modifications reversed before operating at lower altitudes. Operation of the
generator at an altitude lower than the carburetor is jetted for may result in reduced performance,
overheating, and serious engine damage caused by an excessively lean air/fuel mixture.
CAUTION!
2.7 Operation at Extreme Temperatures
High temperatures adversely affect generator operation.
Generator performance will decrease 1% for each 10°F
(5.5°C) increase in temperature above 85°F (29°C). The
normal operating range of this generator is 5° to 104°F (-15°
to 40°C). Although the generator can operate at 5°F (-15°C)
it will be necessary to use a lower viscosity engine oil such
as SAE 0W-40. Even with 0W-40 oil, the engine will be
more difficult to start.
When operating the generator below 5°F (-15°C), the unit may be difficult to start. In temperatures above
104°F (40°C), the output power will be derated.
CAUTION!
2.8 Engine Shutdown
To stop the engine in an emergency, push the engine switch on the control panel to the OFF position.
In an emergency, push the engine switch to the off position. This will stop the engine with or without a load.
However, repeatedly stopping the generator without disconnecting all loads may damage the generator or power
supply.
CAUTION!
Normal Shutdown Procedure:
1. Disconnect load.
2. Push the engine switch to the OFF position.
3. Turn the fuel valve to the OFF position.
Recommended Oil
SAE 0W-40 SAE 10W-40
0° F 32° F 113° F
(-18° C) (0° C) (45° C)
Fig. 2-8, Recommended Oil By Temperature
Fig. 2-9, Fuel Valve ON/OFF Positions