Brasch GDCP-A, Instruction & Operation Manual

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             template is enclosed with the important papers shipped with the panel, and 

may be used to locate the mounting holes.  Attach the housing to a wall, or 
other solid support, using only these holes.  This unit must not be mounted by 
drilling or punching holes in the inside of the housing.  Metal shavings, or 
other foreign objects, may cause damage to the panel’s circuit boards.  The 
damage created would, of course, not be covered by the manufacturer’s 
warranty.   

Mount the panel with at least #10 screws through all four holes.  Make sure that 
the screws are driven in fully and that the mounting surface is strong enough to 
support the panel’s weight.      

2-5 

Wiring Connections  

2-5.1 

This control panel is designed to operate from 120 VAC power at 50/60 Hz.  The 
power circuit must be able to supply at least 120 VA to the panel.  This supply 
circuit must include a disconnect device or switch located within easy 
reach adjacent to the panel’s location.  This component must be clearly 
labeled as the disconnect device for the panel.   

Use 12 or 14 AWG, stranded wires to provide the 120 VAC power to the control 
panel.  Although the panel uses less than 0.5 Amps of operating current, 
extremely long lengths of wiring between the service breaker and the panel could 
result in large voltage drops occurring across the wire lengths.  If long lengths of 
wiring are required, use 12 AWG wiring for the supply circuit.   

The power connections are made on the Power Supply/Relay P.C. board.  Fig. 
3, page 13, shows an internal, bottom view of the assembled panel.  Use this 
figure to locate the Power Supply/Relay board.  Fig. 4, page 14, shows the 
location of the power terminal strip, TS1, where these connections are made.  L1 
is for the 120 VAC hot lead, while the 120 VAC neutral wire connects to L2.  
The four ground points on terminals 3 through 6 can be used to attach the 
circuit earth ground.  

  2-5.2  Connections between the panel and the transmitters require a five conductor, 

shielded cable.  This cable should have 18 AWG, stranded conductors.  Each 
conductor should have a distinct color to avoid any wiring errors at either the 
panel or transmitters.  This cable provides both the operating voltage to the 
transmitters and the digital communication lines between each transmitter and 
the control panel.    

            The transmitters can be connected in a parallel fashion.  This connection 

scheme is sometimes referred to as a daisy chain connection.  The farthest 
transmitter should be at, or less than, 1000 feet from the panel.  The panel 
contains two terminal strips for connecting the transmitter cable.  As many 
as four cables can be connected at the control panel.  Fig. 5, page 15, 
shows the location of these terminal strips.  The function of each terminal 
point is written directly next to each point.  Table 2-5.2, on page 16, 
explains the function of each terminal point on these strips.