3M 478DA (D-15) Installation Manual - page 2
A. Package Contents
Qty. Part
Number
Description
1
78-8050-8476-7
Installation Instructions
1
78-9236-3421-2
Model 478DA (D-15) Intercom
1
78-8095-0213-7
Cable Assembly
1
78-8028-9283-2
Transformer, 14 VAC, Plug-In
1
78-6912-0130-1
Operating Instructions
1
78-8028-8969-7
Warranty Card
1
34-7016-3597-0
Dealer Receiving Report Card
1
78-8050-8438-7
Wire Cover
2
78-8027-9017-4
Mounting Guide
1
78-8028-8990-3
Mounting Bracket
8
26-1000-4190-9
Screw, Phillips, Self-tapping, 6-20 x 1/4 inch
Check for shipping damage. Notify the shipping company immediately if any is found. Retain all packaging and components for
inspection by the shipping company.
B. Introduction
The Model 478DA "D-15" is a single-channel intercom for point-to-point communication applications. The 478DA includes a
visible/audible presence alert and the capability of two units communicating with the same speaker. Follow these instructions
carefully to ensure proper installation and reliable operation.
C. Mounting Methods
The D-15 has four rubber feet for countertop placement, but we suggest permanent surface attachment to prevent movement. Use
the enclosed mounting guides and "A" bracket to mount the D-15 to a wall, microphone stand flange mount, junction box or optional
pedestal mount (78-8028-9095-0) as shown in figure 2. Use of the pedestal mount positions the unit closer to the operator for better
voice clarity and lower listen volume. Install the "A" bracket as follows:
1. Attach the "A" bracket to the pedestal mount, junction box or wall.
2. Attach the two mounting guides to the D-15 bottom using six of the 6-20 x 1/4-inch screws per figure 2-A.
3. Connect power and plug-in cables to the rear of D-15 and mount the rear wire cover.
4. Slide the D-15 onto the "A" bracket and lock it in place with the remaining two 6-20 x 1/4-inch screws.
D. Connection to Optional System Components
1. SPEAKER & DETECTION CABLE The D-15 requires the following cabling from the menu sign to the D-15:
OUTSIDE SPEAKER/MIC - 18-22 AWG twisted pair
MAGNETIC LOOP - 16-18 AWG twisted pair with shield.
AIR SWITCH - 18-22 AWG twisted pair.
OPTIONAL OUTSIDE MICROPHONE -18-22 AWG twisted pair with shield,
NOTE: If the D-15 is being used as a backup intercom to a wireless system, the wiring requirements of the wireless intercom
take precedence.