INSTALLATION INSTRUCTIONS

READ & SAVE THESE INSTRUCTIONS!

Apartment House

Intercoms

MODELS: 478-76 & 478-77

TWISTED

PAIR

Model 478-76

Use as a replacement control amplifier for the former Direct-A-Com 1 System, Model 476 amplifier:

1.Install the Model 467 Postal/Main Door Timer module as described in the instructions packaged with the unit.

2.Wire the amplifier-adapter to the system as shown in the wiring diagram.

TO APT. NO 3

TO APT. NO 2

DIR.

1

 

 

2

 

3

478-76

DOOR REL.

INLCUDES:

 

 

 

 

 

 

 

 

 

POSTAL LOCK

467

A2

 

 

TWISTED

478

 

 

A1

 

 

 

 

ADAPTOR

 

TWISTED

PAIR

LOBBY SPKR.

 

 

 

 

 

 

 

PAIR

 

 

 

 

 

ADAPTOR BOX

 

 

 

 

 

 

 

 

 

A2

 

 

 

 

 

A1

 

 

 

RING COMMON 1

 

 

A2

 

 

 

 

 

 

 

 

 

 

A1

 

 

CONTROL

 

 

RING SWITCH

 

 

GROUND

 

 

 

 

 

 

16VAC

 

REMOTE COMMON

 

 

 

 

 

 

 

 

16VAC

 

 

301

TRANSFORMER

486B

APT. NO 1

R

A2

A1

C

(Please see other side for Model 478-77)

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NuTone 478-76.478-77 installation instructions Apartment House Intercoms, Models 478-76