6
Section 1
Introduction and Specifications
1-1
Introduction
1-1.1
This manual covers the capabilities, installation, set-up and operation of the
Brasch GDCP-A Control Panel. The panel and its associated transmitters are
referred to as the ventilation control system. These systems can be as simple
as a panel and one transmitter controlling one ventilation fan, or as complex as a
panel with 20 transmitters controlling six output zones with two ventilation fans
each.
The user is strongly encouraged to read, and understand, this entire
manual before attempting to install and operate this equipment.
1-2
Model Description
1-2.1
The Brasch GDCP-A Control Panel, along with its associated transmitters,
provides a complete monitoring system for detection and removal of dangerous
concentration of specific toxic gases. The system is capable of monitoring up to
20 remote locations for gases such as carbon monoxide and nitrogen dioxide.
The panel can then provide control signals, based upon the actual gas
concentration, to actuate warning alarms and operate ventilation equipment
within the monitored area.
The panel can control up to six ventilation zones. Two, dry-contact, normally
open, control relays are provided for each zone. The Low Alert set of contacts
have ten field adjustable levels. The concentrations of these levels are
dependent upon the type of gas being monitored. See Appendix E for the
actual Low Alert values. The High Alert set of contacts are factory set to close
at a predetermined level. This level is 100 parts per million, (PPM), for carbon
monoxide and 5 PPM for nitrogen dioxide. The Low Alert relay contacts will
close, (open), once the gas level is above, (below), the field selectable level and
a field selectable delay period has timed out. The High Alert contacts will close,
(open), once the levels are above, (below), the factory preset concentrations.
A dry-contact, normally open relay, that is common to all of the six control zones,
will close 15 minutes after a High Alert level is exceeded and maintained. Once
the High Alert level drops below the factory settings, this relay will again revert to
the normally open state. This relay may be used to send warning signals to
remote locations, or actuate external alarm components to provide additional
warnings. A piezoelectric buzzer, mounted beneath the GDCP-A s front panel,
will also sound while the relay contacts are closed. This buzzer may be silenced
by pressing and then releasing the ALM OFF switch located directly below the
buzzer sound venting holes on the right side of the front panel. This switch will
automatically reset itself after the alarm condition is no longer valid.
The GDCP-A Control Panel can be field programmed to suit the user s
requirements. Program choices are displayed on the 4 lines of a 20 character
per line, liquid crystal display. The appropriate choice is selected through the
use of a four key keypad located directly below the display. The active keys
Summary of Contents for GDCP-A
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