Giving your Family Peace of Mind
The installation of the generator
- Install the unit where air inlet and outlet openings will not become obstructed by leaves, grass, snow, etc. If prevailing winds will cause blowing or drifting, consider using a windbreak to protect the unit.
- Install the generator on high ground where water levels will not rise and endanger it. It should not operate in or be subjected to standing water.
- Allow suffi cient room on all sides of the generator for maintenance and servicing. This unit must be installed in accordance with current applicable NFPA 37 and NFPA 70 standards, as well as any other federal, state and local codes for minimum distances from other structures. DO NOT install under wooden decks or structures unless there is at least 5ft. (1.52m) of clearance above the generator, 3ft. (.91m) of clearance on sides and front, and a minimum of 18in. (457mm) of clearance at the back of the unit.
- Install the unit where rain gutter down spouts, roof run-off, landscape irrigation, water sprinklers or sump pump discharge does not fl ood the unit or spray the enclosure, including any air inlet or outlet openings.
- Install the unit where services will not be affected or obstructed, including concealed, underground or covered services such as electrical, fuel, phone, air conditioning or irrigation. This could affect Warranty Coverage.
- Where strong prevailing winds blow from one direction, face the generator air inlet openings to the prevailing winds.
- Install the generator as close as possible to the fuel supply to reduce the length of piping. REMEMBER THAT LAWS OR CODES MAY REGULATE THE DISTANCE AND LOCATION.
- Install the generator as close as possible to the transfer switch. REMEMBER THAT LAWS OR CODES MAY REGULATE THE DISTANCE AND LOCATION.
- The generator must be installed on a level surface. The generator must be level within a .5in (13mm) all around.
- The generator is typically placed on pea gravel, crushed stone or a concrete pad. Check local codes to see what type is required. If a concrete pad is required, all federal, state and local codes should be followed.
The National Fire Protection Association has a standard for the installation and use of stationary combustion engines. That standard is NFPA 37, its
requirements limit the spacing of an enclosed generator set from a structure or wall (Figure 1.10).
NFPA 37, Section 4.1.4, Engines Located Outdoors: Engines, and their weatherproof housings if provided, that are installed outdoors shall be
located at least 5ft. (1.52m) from openings in walls and at least 5ft. (1.52m) from structures having combustible walls. A minimum separation shall not
be required where either of the following conditions exist:
1. The adjacent wall of the structure has a fi re resistance rating of at least 1 hour.
2. The weatherproof enclosure is constructed of noncombustible materials and it has been demonstrated that a fi re within the enclosure will not
ignite combustible materials outside the enclosure.
Annex A — Explanatory Material
A4.1.4 (2) Means of demonstrating compliance are by means of full scale fi re test or by calculation procedures. Because of the limited spaces that are frequently available for installation, it has become apparent that exception (2) would be beneficial for many
residential and commercial installations. With that in mind, the manufacturer contracted with an independent testing laboratory to run full scale fire tests to assure that the enclosure will not ignite combustible materials outside the enclosure.
The criteria was to determine the worst case fire scenario within the generator and to determine the ignitability of items outside the engine enclosure at various distances. The enclosure is constructed of non-combustible materials, and the results and conclusions from the independent testing lab
indicated that any fi re within the generator enclosure would not pose any ignition risk to nearby combustibles or structures, with or without fi re service
SIZING GENERATOR TO START AND OPERATE CENTRAL AIR CONDITIONER
AND ELECTRIC MOTORS
SIZING GENERATOR TO START AND OPERATE CENTRAL AIR CONDITIONER
AND ELECTRIC MOTORS
Motor driven appliances (such as refrigerators and air conditioners) for initial start-up require larger amounts of current than when they are running. This is because induction motors initially act like a short-circuited transformer. The maximum start up current is referred to as " Locked Rotor Amps (LRA). This current will drop significantly when rotor accelerates to about 75% full speed. The LRA is typically 3 to 8 times continuous operating current (called full load amps, or (FLA). Note, this does not equate to 3 to 8 times real (active) power because the power factor of a starting motor is low (<0.5). That's why when selecting a home generator for starting requirements, you must consider primarily its current surge capability.
By the way, fridges may have lesser ratio between LRA and FLA because of the resistive heaters that are periodically connected to defrost the freezer.
You can usually find your appliance starting amps on its nameplate. If LRA is not indicated on the label, you can measure it although it may not be easy. Just don't try to do it unless you have proper electrical training. You will need to reach a single wire in the cable that feeds your device. If it is a cord and plug device, you may take an extension cord, carefully remove a few inches of the external sleeve and pull black lead out of the bundle. You will need a clamp-on meter with Peak (surge) capability. Set it to Peak reading, put on line worker rubber gloves and enclose the wire within the clamp. Finally, have someone turn on the device and take the reading. For reference, here are typical nominal starting requirements of single-phase 240VAC central air conditioners depending on their size.
Once you know LRA, you can pick a genset. However there is one lesser known detail you need to know. Most guides will tell to pick a system with surge current matching LRA of your motor. Well, with such an advice you may wind up with twice larger device than you really need. The case is that nameplate LRA is given for full voltage starting
. In reality, motor's current surge causes voltage dip of the generator. When voltage drops, the current is reduced proportionally. Most residential appliances can start with 30% voltage sag, that is at currents 30% lower than their nameplate LRA. With that, starting volt-amps can be 0.7×0.7=0.49 of nominal. Commercial application normally allow 15% drop.
The above chart may be confusing for some. Indeed, technically, 1 ton refrigeration is 4.7 hp or 3.5 kW. However, in case of air conditioners, electricity is used to pump energy from a cold area to a hot area. With a typical efficiency, 1 kW of electric power can transfer 3 to 4 kW of cooling. That's how 1 ton a/c can have 1 hp motor.
Example. Let's see what genset do you need for a 5-ton a/c. We find from our table that at nominal voltage such a device would initially draw 145A. But at 70% voltage it would draw only 145*0.7=101.5 A. From the genset data we see that to provide such a surge current you need a system rated 14kW or greater. Note that during steady state operation the a/c in our example will consume about 6 kW. So, you would have up to 8 kW available to run other devices in your home.
REVIEW AND RATINGS TABLE OF STANDBY GENERATORS FOR HOME USE
If you have several motor driven loads, the calculation is a bit more complicated. You need to find the load with the greatest difference between surge and running currents. Then add that difference to the total running current of all appliances assuming multiple devices rarely start up at exactly the same time. This will give you net surge current requirement of your backup system. See our generator sizing guide for details. If you are buying an automatic system without an "intelligent" load control, be aware that after detecting a service interruption it may try to activate all your motors simultaneously. With such a system you'll need a genset with the capacity to provide the total starting current. Otherwise, the motors may trip the genset's circuit breaker or can overheat and even burn out. Alternatively, you may choose to set your standby system to manual mode. Then in emergency you will first turn on the central a/c and then all other loads sequentially.
Optional Home Security Cameras Added
Optional Home Security Cameras Added
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