Macurco GD-2B User Instructions - page 9
9
In addition to the methane (natural gas) and propane (LP) gas that it is designed to
detect, the GD-2B can also be affected by a broad range of combustible gases. Some of
these that may cause an alarm are: alcohol, ammonia, cleaning solvents, paint thinner,
gasoline vapors, and aerosol propellants. Aerosol cans such as hair spray usually contain
a combustible gas. Always make sure that there is adequate ventilation when you use
these products. Proper location, not in kitchens or bathrooms, will minimize alarms due to
normal use of household products.
RESET/SILENCE SWITCH
The switch on the front of the GD-2B labeled “TEST/RESET,” performs four functions.
1. A short press of the button (less than 5 seconds) will place the unit into self-test mode
with no alarm relay activation. The buzzer will sound for two complete alarm cycles,
the LED will turn red for 5 seconds and then it will alternate between green and amber
every second while the self-test executes. About a minute after entering in self-test
mode software will simulate an alarm condition. When this happens, the LED turns red
and the buzzer will sound two complete alarm cycles. The unit will then return to
normal operation.
2. Pressing and holding the button will cause the buzzer to sound for two complete alarm
cycles and LED turns red for 5 seconds and then to solid amber for 30 seconds. The
alarm relay is activated during the 30 seconds while LED is solid amber. Button can be
released once the solid amber is displayed. 30 seconds after entering self-test mode
the alarm relay will turn off and the LED will alternate between green and amber every
second while the self-test executes. About a minute after entering self-test mode
software will simulate an alarm condition. When this happens, the LED turns red and
the buzzer will sound two complete alarm cycles. The unit will then return to normal
operation.
3. If the GD-2B is in an alarm condition due to the detection of combustible gas, one
push of the switch will cause the alarm buzzer to mute for five minutes. After the five-
minute period, if gas is still present, the status light will again switch to RED, the alarm
relay will close and the buzzer will sound. If after the five-minute period, the detected
gas level has dropped below 25% LEL the GD-2B unit will reset unless it is latched in.
See LATCH IN option of OPERATION section.
4. If the GD-2B is at the end of its seven year life the TEST/RESET switch can be used to
temporarily silence the buzzer function. See section "End-of-life Indicator"