NuTone Car Amplifier 478 76478 77 User Manual

INSTALLATION INSTRUCTIONS  
READ & SAVE THESE INSTRUCTIONS!  
Apartment House  
Intercoms  
MODELS: 478-76 & 478-77  
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  
1
2
3
DIR.  
486B  
APT. NO 1  
TWISTED  
PAIR  
478-76  
INLCUDES:  
DOOR REL.  
R
467  
478  
ADAPTOR  
A2  
A1  
TWISTED  
PAIR  
POSTAL LOCK  
LOBBY SPKR.  
A2  
A1  
TWISTED  
PAIR  
ADAPTOR BOX  
C
A2  
A1  
A2  
A1  
RING COMMON 1  
CONTROL  
GROUND  
RING SWITCH  
REMOTE COMMON  
16VAC  
16VAC  
301  
TRANSFORMER  
(Please see other side for Model 478-77)  
 

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