Chamberlain LiftMaster TAC2C Installation Manual Download Page 2

 

© 2011, The Chamberlain Group

01-35895B 

All Rights Reserved

When wiring is complete, secure the new faceplate to 
the existing housing with the provided screws (4).

SET THE MASTER CODE

Once power is applied, the unit will begin to “click” to 

indicate that it is powered, and is waiting to be programmed for 
the unit’s Master Code. The Master Code is used to unlock the 
programming functions of the unit. The Master Code should not 
be distributed as a User Code.

Enter 

on the unit’s keypad.

Enter 4-digit Master Code. Example: 1234.

 “BEEP” 

“BEEP”

Write down the Master Code and store in a secure 
location.

1

2

3

1 2 3

4 5 6

7 8 9

*

0 #

RELAY 1
COM

RELAY 1
NO

RELAY 1
NC

RELAY 2

         NC

RELAY 2
         NO

RELAY 2
      COM

RELAY 1

COM

RELAY 1
NO

RELAY 1
NC

RELAY 2

         NC

RELAY 2

         NO

RELAY 2

      COM

Connect the power wires to the new transformer and 
plug the transformer into a 110 Vac outlet ONLY, any 
other type of outlet will cause damage to the unit. 

NEW 16 Vdc 
Transformer 

(provided)

110 Vac Outlet ONLY

8

POWER

Ground Wire

Crimp the ground lug onto the end of the 

ground wire on the new board. Attach the 

ground lug to the ground screw in the 

existing housing.

Rewire the relay 1 and 2 wires 

to the relay 1 and 2 terminal 

blocks on the new board.

Ground Lug

Ground Screw 

in existing 

housing

Remove the PHONE, POWER, and AUTOCALL 

terminal blocks from the new board. Leave the 

Relay 1 and 2 terminal blocks.

NEW TAC2C BOARD

AUTOCALL

PHONE/TELCO

RELAY 1

RELAY 2

POWER

AUTOCALL

PHONE/TELCO

Attach the labeled wires to the new TAC2C board as shown.

RELAY 1

RELAY 2

COM

NO

NC

COM

NO

NC

For complete programming information refer to the 
Programming Guide.

6

7

9

Testing

TEST GATE / DOOR RELAYS

Test Relay 1 

Enter 4 digit Master Code. 

Press 1 to test Relay 1.

Test Relay 2

Enter 4 digit Master Code. 

Press 2 to test Relay 2.

TEST THE TELEPHONE CONNECTIONS

 Place a telephone call from the resident’s telephone to verify 
the unit is operating properly, then hang up the phone.

 
Press the “Call” button on the unit’s keypad. The telephone in 
the residence should ring.

To test Relay 1 have someone answer the telephone and enter 
“*9” (Star + 9) to activate Relay 1. The unit will disconnect 
the call as soon as the relay is activated. To test Relay 2 have 
someone answer the telephone and enter “*5” (Star + 5). 
Relay 2 should activate. The unit will disconnect the call as 
soon as the relay is activated.

1

1

2

1

2

2

3

IMPORTANT NOTE:

 

DO NOT use the existing transformer, 

the 

provided

 transformer MUST be used instead.

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