Section 1 — General Information
Guardian
1.10 ENGINE OIL RECOMMENDATIONS
The unit has been filled with
| Temperature | Oil Grade(Recommended) |
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| Above 80º F (27º C) | SAE 30W or |
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| 32º to 80º F | SAE |
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| Below 32º F (0º C) | SAE 10W or |
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Any attempt to crank or start the engine before it ! has been properly serviced with the recommended
oil may result in an engine failure.
1.12 EMISSIONS CONTROL SYSTEM
(MODEL 0046265)
This model is equipped with an active exhaust emis- sions control system to comply with certain California air district regulations for natural gas emergency gener- ating sets, including the South Coast Air Quality Management District. DO NOT tamper with or disable any part of this system, including the exhaust catalyst, carburetor, oxygen sensor,
This model is of a size (greater than 50 brake horse- power) that may require a review by air permitting authorities prior to installation and operation. Consult the local air management district for details and spe- cific requirements.
1.11 COOLANT
Use a mixture of half low silicate, ethylene glycol base antifreeze and half deionized water. Use only deionized water and only low silicate antifreeze. If desired, add a high quality rust inhibitor to the recommended coolant mixture. When adding coolant, always add the recom- mended
DANGER
Do not remove the radiator pressure cap while
!the engine is hot or serious burns from boiling liquid or steam could result.
Ethylene glycol base antifreeze is poisonous. Do
!not use mouth to siphon coolant from the radia- tor, recovery bottle or any container. Wash hands thoroughly after handling. Never store used antifreeze in an open container because animals are attracted to the smell and taste of antifreeze even though it is poisonous to them.
Do not use any chromate base rust inhibitor
!with ethylene glycol base antifreeze, or chromi- um hydroxide (“green slime”) will form and cause overheating. Engines that have been oper- ated with a chromate base rust inhibitor must be chemically cleaned before adding ethylene glycol base antifreeze. Using any high silicate antifreeze boosters or additives also will cause overheating. Generac also recommends that any soluble oil inhibitor NOT be used for this equip- ment.
Figure 1.4 - Emissions Control System
1.12.1 AIR FUEL RATIO CONTROLLER
The air fuel ratio controller is an advanced micro- processor designed to work with a
Principle of Operation: The oxygen sensor, installed on the exhaust pipe, between the engine and the cat- alytic muffler (closer to the engine), continuously moni- tors the exhaust gas composition. A feedback signal is sent from the oxygen sensor to the air fuel ratio con- troller, which controls the fuel system to maintain the optimal, stoichiometric air fuel ratio. The air fuel mix- ture to the engine is controlled by biasing the diaphragm in the fuel regulator using vacuum (from the carburetor). This vacuum signal is directed to the fuel regulator via the control valve. The air fuel ratio con- troller determines the amount of vacuum signal sent to the fuel regulator. The more vacuum sent to the regula- tor, the more restricted the fuel flow will be, therefore the leaner the air fuel mixture.
Generac® Power Systems, Inc. 7