Page 458 - Womens Pavilion

TotalAlert Infinity™ NFPA Medical Gas Notification System

NOTE: 2.3.8 B50 4-20mA Combination
Each pair of terminals labeled on the signal Board
board connector is labeled “+” and “-”. Ensure
that when a source equipment dry contact is A Combination alarm can contain a B50
wired to two master panels, the same side of board that contains four 4-20mA inputs that
the dry contact is connected to the same termi- can be used with a 2 or 3 wire transmitter.
nal at both panels. For example, if the source The board also contains seven signal inputs,
equipment’s normally closed contact is wired to which monitor normally closed signal inputs,
the “+” of the first master panel, ensure it is also and six normally closed dry contact relay out-
connected to the “+” terminal of the second puts. Each alarm panel can have a maximum
master panel. of one B50 board.
2.3.7 B4X Relay Output Board
Identify each set of field installed 4-20mA

A Master or Combination alarm can contain input signal wires (2 or 3 wires per set) inside
multiple relay output boards; up to a maxi- the alarm rough-in box. Route each set of in-
mum of 4 boards with 16 relay outputs each. put wires to the appropriate terminals on the
The B4X boards (B40, B41, B42, B43) utilize B50 board. Connect each set of signal wires
normally closed dry contact relay outputs. to the terminal blocks, noting the correct
The outputs on the B4X boards are labeled polarity (Figure 28).
Y01 through Y16.

Identify each pair of field installed relay
output signal wires inside the alarm rough-in
box. Route each pair of relay output wires as
shown in Figure 27 to the appropriate termi-
nals on the relay board. Connect each pair
of signal wires to the terminal blocks, noting
the correct polarity (+,-). Refer to NFPA Mas-
ter/Combination Wiring Diagram (Section
3.1/3.3).

Figure 28: B50 Board Wire Routing

Figure 27: B4X Board Wire Routing

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