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6. FEATURES AND OPERATION
OPERATION: The CO alarm is operational once a battery is installed and testing is
complete. The green LED will blink once per minute. For models 7035/7035SL, the
LCD will also continuously display “ On” to indicate that the CO alarm has power.
LOW BATTERY CONDITION: When the battery voltage drops below an acceptable
level, the alarm will chirp once per minute and the green LED will blink for 5 seconds at
the same time. For models 7035/7035SL, the LCD will also continuously display “bAt”.
The battery should be replaced immediately for uninterrupted protection. Please see
Section 5 for information regarding battery replacement.
SERVICE (TROUBLE) CONDITION: An internal microcontroller continuously monitors
the sensor function and other critical components. If an internal failure of any of these
components should occur, the alarm will chirp twice per minute and the red LED will
blink for 5 seconds at the same time. For models 7035/7035SL, the LCD will also
continuously display “Err”. The trouble condition indicates a problem with the unit.
Please see Section 12 for information regarding service.
LIFE MONITOR (END-OF-LIFE) CONDITION: The electrochemical sensor has an
estimated life expectancy of five years. Once the battery is installed or activated, a
microcontroller monitors the total time that the alarm is under power. After five years of
service, the “End-of-Life” signal will be activated; the alarm will chirp once per minute
and the red LED will glow for 1 second at the same time. For models 7035/7035SL, the
LCD will also continuously display “End” to indicate that the sensor life has expired and
the alarm should be replaced.
ALARM CONDITION: When CO gas is detected at a level and duration specified in
Section 2 CO RESPONSE TIME, the horn will sound and the red LED will flash. The
alarm signal will sound 4 short beeps every 6 seconds for 5 minutes, and thereafter 4
short beeps every minute until manually or automatically reset. The red LED will flash 4
times every 6 seconds until the CO gas which caused an alarm activation has cleared.
See Section 8 for information about manual and automatic alarm reset.
TEST/RESET BUTTON: The TEST/RESET button is used to check the alarm for proper
operation and to temporarily mute horn for 5 minutes when alarm is activated, for 24
hrs. during the first week of a “Low Battery” signal activation, or for 60 hrs. during the
first month of an “End-of-Life” signal activation.
LCD DISPLAY FUNCTION (FOR MODELS 7035/7035SL): When alarm is operating
normally, the LCD will continuously display “On”. If room temperature exceeds 120°F
(48°C), the LCD will display “On” for 1 second every minute. If a CO level of 40 ppm or
more is detected, or alarm is activated, the LCD will display current CO level detected
up to 600 ppm. The LCD will display 600 ppm for CO levels detected above 600 ppm.
MEMORY RETRIEVAL OF CO LEVELS DETECTED (FOR MODELS 7035/7035SL):
To display the current and highest CO level detected, tap the TEST/RESET button. The
LCD will display the recorded data in the following order:
1. The current CO level detected from 10-600 ppm,
2. The peak or highest CO level detected from 10-600 ppm, and
3. The total length of time the alarm has detected the peak CO level from 0-999
minutes. Each reading will appear for five seconds.
To erase the record in memory, press and hold the TEST/RESET button until all three
readings have been displayed, the alarm bursts a long beep, and the display reads
"Clr". Disconnecting the battery from the alarm for 1 minute will also erase memory.
