Linear MULTI-CODE 4120 Installation Instructions page 2

If you have two single channel receivers: Set your transmitter so that the ten position
switch on side A will match your receiver #1. Set the ten position switch on transmitter side B
to your receiver #2 (see figure 2).
CODE SWITCH
SIDE A
If you have a MULTI-CODE™ 3021 or 3028 two channel receiver: Set the receiver
and transmitter (side A and B) code switch positions 1-9 to match. The 10th position on your
transmitter code switches are used for channel selection.
Channel 1 on the receiver is selected by moving the 10th position of the transmitter side A to the
off (open) position. Channel 2 is selected by moving the 10th position of the transmitter side B to
the on (closed) position. Once the codes have been set, check the operation and replace the lower
cover.
TRANSMITTER INSTALLATION
The transmitter is completely self contained, including battery, and can be operated while mounted
in the car. It is supplied with a clip for attaching to the sun visor, if desired. If the clip is used, attach
to the case by sliding it into the recess provided on the back of the transmitter until the small
dimples fit into the holes in the clip.
INSTR,INSTL,MC4120,2CH,TX - LINEAR P/N: 214881 Rev-C - INK: BLACK - MATERIAL: 20 LB. MEAD BOND - SIZE: 9.000" X 3.500" - SCALE: 1-1 - SIDE 2 OF 2
CODE SWITCH
SIDE B
Figure 2
PRINTER'S INSTRUCTIONS:
WARRANTY
ALL MULTI-CODE door related products carry an eighteen (18) month warranty against defects in
workmanship or material. This warranty begins at the date of manufacture, for eighteen months.
Nortek Security & Control warranties our product only to our authorized dealers and distributors,
and not to the end customer. If you have any questions about our warranty, please ask your dealer
to determine the nature and scope of his warranty. Nortek Security & Control does not assume, and
is not responsible for, any real or consequential damages from claims against the performance of
our product, nor is it liable for any costs related to loss of life, property, or revenue. Further, Nortek
Security & Control is in no way responsible for installation of our product, and will assume no costs
to reinstallation or removal. Nortek Security & Control Warranty is in lieu of all other warranties,
expressed, or implied.
PLEASE NOTE
Nortek Security & Control has devoted a great deal of time and research in order to provide the
most reliable equipment possible. Certain limitations must be observed.
(1) MULTI-CODE radio components must conform with FCC Part 15 requirements. For this reason, the range
and power of our radios is within specified limits.
(2) As with all manufacturers, Nortek Security & Control radios must accept all signals that they receive.
This may, in rare instances, create difficulty.
(3) You should test your entire system occasionally in order to be sure that all components are working in
good order.
(4) Nortek Security & Control dealers can provide you with information regarding the use of our radio
controls, and can provide valuable installation and operation information, when requested.