HS-04 Operator’s Manual Chapter 2: Description • 11
Control Buttons
Two control buttons, AIR and POWER MODE, are located below the LCD.
Alarm LED
The alarm LED above the sensor and buzzer openings alerts you to gas, low battery, and failure
alarms.
Buzzer
One solid-state electronic buzzer is located inside the case. Sound exits the case through a hole in
the upper left corner of the front case. The buzzer sounds for gas alarms, malfunctions, and low
battery voltage. It also provides feedback for button presses and while in Display, User,
Maintenance, or Gas Select Mode.
Vibrator
A vibrating motor inside the HS-04 case vibrates for gas alarms and unit malfunctions.
NOTE: If STEALTH is set to ON, the vibrator only functions when VIB in the STEALTH Gas
Select Mode item is set to ON (see page 96).
Table 3: HS-04 Control Button Functions
Button Function(s)
AIR • turns on LCD backlight
• resets alarm condition if LATCH is set to ON in Maintenance Mode
• enters User Mode, Maintenance Mode, and Gas Select Mode when
used with POWER MODE
• activates the demand zero function (adjusts the HS-04’s fresh air
reading)
• changes the value of a parameter available for adjustment
• scrolls through parameter options
POWER MODE • turns the HS-04 on and off
• turns on LCD backlight
• enters and scrolls through Display Mode
• enters instructions into the HS-04’s microprocessor
• resets alarm condition if LATCH is set to ON in Maintenance Mode
• enters User Mode, Maintenance Mode, and Gas Select Mode when
used with AIR
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