3 | INSTALLATION | 3 |
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BEFORE INSTALLATION
Inspect the Load Bank for obvious damage such as broken wires, broken or dented panels, cracked ceramic insulators, or any other component breakage that may have occurred in shipment.
LOCATION
The Master Load 750 is a portable, indoor, outdoor Load Bank, and should be installed in a dry, cool,
CAUTION
Installation must prevent hot exhaust air from recircu- lating into the air intake. Inlet air temperatures exceeding 120° F (50° C) may cause damage to the Load Bank. After installation, test the unit at full load and verify that the inlet air temperature does not exceed 120° F (50° C).
AIRFLOW CONSIDERATIONS
Even with an ample supply of cooling air, the load bank may overheat if it is not properly installed. There are two types of airflow problems that should be avoided:
1.Recirculating Airflow - If the hot, exhausted air is permitted to recirculate through the load bank, the air will reach such a high temperature and low density that it will no longer cool the resistance elements. A load bank should not be installed so close to any surface as to reflect the exhausted air back to the air intake. When two or more load banks are being used, care must be taken in posi- tioning the units so that the exhausted air of one unit does not feed the air intake of another.
2.Restriction of Cooling Air - Any obstruction located within 8 feet (2.4 m) of the inlet and exhaust screens will restrict the load bank's air- flow. Airflow is also restricted when two or more load banks have air inlets positioned too close to each other. This competition for cooling air caus- es a low pressure area, restricting adequate air- flow.
WARNING
It is important to install the Load Bank properly. Installation errors may result in a catastrophic failure.
The over temperature switch, a protective device in the load bank, will guard against some of these prob- lems. If protective circuitry prevents application of the load, determine the source of the problem. DO NOT DISABLE THE OVER TEMPERATURE SWITCH. This causes a safety hazard and voids our warranty. The following installation instructions are critical to the safe operation of the Load Bank. Refer to the Load Bank Safety section of this manual.
POWER REQUIREMENTS
The Load Bank requires a 120 volt, single phase, 60 Hz, 15 amp source of power for operation of the con- trol panel and cooling fan. A power cord for control power is provided with the Load Bank. Connect the power cord to a grounded 120 volt source.
Load power is connected to the Load Bank through receptacles on the side of the Load Bank labeled L1 and L2.
WARNING
Do not energize the Load Bank with the top cover removed. Make sure the top cover panel is securely fas- tened to the frame.
Cables to the Load Bank should be of adequate size to handle the maximum rated current according to the National Electrical Code and any local codes. A ground stud is provided and must be connected to the frame of the power source, which in turn must be con- nected to a good earth ground.
WARNING
Never exceed the rated voltage as this will cause the Load Bank to overheat.
Lower voltages and different frequencies may be applied to the load circuit of the Load Bank. Frequency change causes no derating of the load; however, the applied KW with a lower voltage is com- puted by using the following formula:
KWApplied = KWRated | X | (Voltage Applied)2 | |
(Voltage Rated)2 | |||
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MASTER LOAD 750
