Assessments - 3, GPA: 3.7
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The NEMA 1 enclosure is intended for indoor use only. The NEMA 3R enclosure is weather proof and can be used indoors or outdoors. Follow these rules: • Install the transfer switch on a firm, sturdy supporting structure. • To prevent switch distortion, level the switch if necessary. This can be done by placing washers between the switch enclosure and the mounting surface. • Never install the switch where water or any corrosive substance might drip onto the enclosure. • Protect the switch at all times against excessive moisture, dust, dirt, lint, construction grit and corrosive vapors. AUTOMATIC SYSTEM OPERATION When this generator, along with its transfer switch, has been installed and interconnected, a circuit board in the generator panel constantly monitors utility power source voltage. Should that voltage drop below a preset value, and remain at such a low state for a preset amount of time, the generator cranks and starts. After the generator starts, the transfer switch transfers load circuits so the generator can power them. When utility source voltage has been restored, the switch re-transfers back to the utility source voltage and the generator then shuts down. GENERATOR AC CONNECTION SYSTEMS The generator was shipped from the factory with its stator AC output leads connected in a single-phase, 3-wire generator AC connection system (Figure 1.1). The stator assembly in this system consists of a pair of stationary windings, with two leads brought out of each winding. Each single winding can supply 120 volts AC, 60 Hertz. When the two windings are connected in series, a 240 volts, 60 Hertz AC output results. Typically the two “hot” leads in the circuit are Wires No. 11 and 44. The “Neutral” leads are the junction of Wires 22 and 33. Figure 1.1 - Generator AC Connection System MAIN CIRCUIT BREAKER The generator’s main circuit breaker is included with the unit as shipped from the factory. The breaker for each unit is described in Figure 1.2 at the top of page 5. GENERATOR FUEL SYSTEM Your unit has been factory tested and adjusted using a natural gas fuel system. If propane (LP) gas is preferred, contact an authorized service dealer. Section 1 - General Information Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators Generac® Power Systems, Inc. 5 Gaseous fuels such as natural and LP (propane) gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explosion. No leakage of fuel is permitted. Natural gas, which is lighter than air, tends to collect in high areas. LP gas is heavier than air and tends to settle in low areas. ENGINE PROTECTIVE DEVICES The engine has several safety switches which cause the engine to automatically shut down under the following conditions: low oil pressure, high coolant temperature, engine overspeed, low coolant level or overcrank (Figure 1.3). Figure 1.3 - Engine Protective Devices LOW OIL PRESSURE SWITCH This switch is normally-closed (N.C.) but is held open by engine oil pressure during engine running. Should operating oil pressure drop below about 8-10 psi (55-68 kPa), the switch contacts close and the engine shuts down automatically (Figure 1.4). Figure 1.4 - Low Oil Pressure Switch HIGH COOLANT TEMPERATURE SWITCH Normally open (N.O.) thermostatic switch has sensing tip which is immersed in captive coolant. Should coolant temperature exceed about 230°F (110°C), the switch contacts close, which causes the engine to shut down automatically (Figure 1.5). Figure 1.5- High Coolant Temperature Switch LOW COOLANT LEVEL SWITCH Should engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shutdown. To prevent such overheating without automatic shut down, the engine has a low coolant level sensor. If the engine coolant drops too low, the engine automatically shuts down (Figure 1.6). Section 1 - General Information Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators Model Rating Phase Actual Current C/B Rating* % over rating Circuit Breaker 004188 15,000 1 62.5 70 112% 70A BQ2 004189 15,000 1 62.5 70 112% 70A BQ2 004370 20,000 1 83.3 90 108% 90A BQ2 004371 20,000 1 83.3 90 108% 90A BQ2 004474 25,000 1 104.2 125 120% 125A BQ2 004475 25,000 1 104.2 125 120% 125A BQ2 * Amp Rating of C/B structured under model. Figure 1.2 - Main Circuit Breaker Section 1 — General Information Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators Figure 1.6 - Low Coolant Level Sensor OVERSPEED SHUTDOWN The CMA circuit board on liquid cooled units receives AC frequency (rpm) signals directly from the stator AC power windings, via sensing leads S15 and S16. Should AC frequency exceed about 72 Hz, circuit board action will automatically shutdown the engine (Figure 1.7). *Rated power of generator is subject to and limited by such factors as ambient temperature, altitude, engine condition, and other factors. Engine power will decrease about 3.5% for each 1000 feet above sea level and wil...
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