Lowell MA250 - Manual (Page 5)

Instruction Sheet
IS-MA60/125/250
Issued: 5-1-14
Lowell Manufacturing Company 100 Integram Drive Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660 Fax: 636-257-6606 Click: www.lowellmfg.com
5
Amplifier Installation and Connection
This unit was carefully checked and packed before leaving the factory. However, it is always a good idea to inspect
the shipping container and unit for indications of improper handling. If the unit has been damaged, make an
immediate claim to the dealer or distributor from whom it was purchased. If the unit was shipped to you, notify the
transportation company without delay, saving all packing materials, in order to process the claim.
INSPECTION
PASSIVE CONVECTION COOLING AND VENTILATION
This unit is cooled via passive convection and therefore designed for continuous operation. Excessive heat due to
poor ventilation can shorten the lifespan of electronic equipment and could void the manufacturer’s warranty. Do
not block the amplifier’s vent slots located on the top, sides, and bottom of the chassis.
SHELF MOUNTING
This amplifier may be placed on a wooden or metal wall-mount shelf. Do not remove the plastic feet from the
bottom of the amplifier chassis. When the amplifier is placed on a countertop or is shelf-mounted, the plastic feet
maintain the proper spacing under the amplifier for passive convection cooling. Do not block the side vents of the
amplifier chassis and do not place anything on top of the amplifier where the vents on the top of the chassis would
be blocked. If it is desired to stack an equalizer like the Lowell EQ1, AM/FM tuner, or other music program source
unit on top of the amplifier, use spacers to make sure there is a minimum of 1.75" clear above the amplifier for
ventilation. Make sure that the spacing blocks do not obstruct the vents on top of the amplifier chassis.
RACK MOUNTING
If the amplifier will be rack mounted, we recommend that you provide a minimum of 1.75
” of open space
above and below the unit to assure proper ventilation. Provide ventilation fans in the equipment cabinet if
that is required to maintain an amplifier operating temperature of no higher than 92
o
F. To mount the
amplifier in a Lowell equipment cabinet, use standard 10-32 Phillips-head machine screws (like the
Lowell model RS or RSP rack screws) with integral plastic washers to protect the finish of the front panel
of the amplifier. R
ack mounting brackets for the amplifier are included.
The AC power cord provided with this amplifier is equipped with a North American style NEMA 5-15P plug and the
AC SUPPLY SWITCH (see item on page 4) is set to operate on a 115 VAC 50/60 Hz. power source. The amplifier
may also be powered with 24VDC (See the DC current requirements under POWER CONSUMPTION in the
TECHNICAL SPECIFICATIONS section on page 3).
If this unit is to be used in other geo-political areas of the world, it may be necessary to change the AC SUPPLY
SWITCH to operate on 230 VAC. Remove the plug from the end of the cord and replace it with one appropriate for
the local power grid receptacle standards. The internal wire color code for the cord supplied with this unit is as
follows:
Green/Yellow
Earth “E” or Safety Ground
Blue Neutral “N”
Brown Line “L” or Hot
Note: If a British Standard BS1363 plug is installed, it must be provided with a 5 Amp fuse.
Since electrical color codes vary around the world, make sure that the correct connections are made to the cord
even if the local color code is different. If in doubt, obtain the services of a locally qualified electrical professional.
POWER WIRING
Before installing the amplifier, continue the inspection by running a quick performance check. Connect an 8
W test
speaker to the 8
W direct output terminals and a tuner, tape deck, or CD player to one of the aux inputs and set the
controls for operation. CAUTION: TO PROTECT THE SPEAKER FROM DAMAGE, DO NOT TURN THE UNIT ON
UNTIL ALL CONNECTIONS HAVE BEEN MADE. IN ADDITION, MAKE SURE THE UNIT IS GROUNDED
BEFORE TESTING. In this way you can check the basic operation of the amplifier before actually installing the unit
and making all of the final terminations required for the permanent installation. If shipping damage has resulted in
the amplifier being inoperable out of the box, call Lowell Customer Service to arrange for a replacement.
INITIAL PERFORMANCE CHECK
WARNING:
THIS AMPLIFIER MUST BE EARTH GROUNDED.