A.O. Smith HYB-90N, Installation And Operating Manual

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316888-001 Rev. 00 dRaFt Jun 28 245 www.hotwater.com 27
OPERATING INSTRUCTIONS
Changing the Standby Status
When the Standby Button is pressed, the Status changes
to normal operation and all the LEDs on the display will
light up for a period of 1 second to verify operation. The
button can toggle the status between Normal operation
and Standby.
Key Lock
NOTE: This is a tamper resistant feature.
The Key Lock is considered “On” or “Off”:
• Key Lock is turned “On” after one minute without a key
press by the user.
• Key Lock can then be turned “Off” for one minute
by simultaneously pressing the “Up” Button and the
“Down” Button for three seconds.
When the keys are locked, the Temperature Set-point
cannot be increased and the Operating Mode cannot be
changed. The set-point may be decreased while the keys
are locked.
The On/Off Button is not affected by the Key Lock feature.
All other buttons are “locked” when the Key Lock is
“On”.
The “Key Lock” icon will be displayed if the water heater
is either in the lock or unlock condition. The Icon is
composed of 3 components, the base, a locked and an
unlocked arc.
Operating Modes
Operating modes are:
Boost (for peak demand), Energy Saver and Vacation.
Three LEDs are used to indicate the Operating Mode.
Vacation Mode:
Yellow LED
Energy Saver Mode: Green LED
Boost Mode:
Orange LED
The Operating Modes have the following characteristics:
Vacation mode:
• Fixed temperature setting of 32°C (90°F)
• Set-point Difference is 8°C (14°F)
• Tank Set-point Differential is 12°C (22°F)
Energy Saver mode:
• Temperature range from 38°C to 57°C (100°F to 135°F)
in increments of 1°C or 1°F
• Set-point Difference is 8°C (14°F)
• Tank Set-point Differential is 8°C (14°F)
Boost mode:
• Temperature ranges from 60°C to 70°C (140°F to
158°F) in increments of 1°C or 1°F
• Set-point Difference is 8°C (14°F)
• Tank Set-point Differential is 5°C (9°F)
Switching between operating modes is done by pressing
the “Mode” Button when the Key Lock is “Off”. When
a mode is active, the corresponding LED is turned on.
Pressing the “Mode” button will cycle between the three
possible modes of operation.
DISPLAY PANEL
STANDBY-ON/OFF
BUTTON
STANDBY LED
(GREEN)
NUMERIC
DISPLAY
UP (HOTTER)
BUTTON
DOWN (COLDER)
BUTTON
KEY LOCK MODE BUTTON
MODE LEDs (3)
TEMPERATURE
UNITS-OF-MEASURE
BURNER IN
OPERATION
FAULT INDICATOR
FIGURE 33