Carrier Aquazone 50QE900-250FS Owner's Manual page 20

About Advanced Features & Operation
KEYPAD LOCK - To prevent unauthorized use of the thermostat,
the front panel buttons may be disabled. To disable, or
'lock' the keypad, press and hold in the Mode button.
While holding the Mode button in, press the Up and Down
buttons in together. The Locked icon will appear on the
display.
Press all 3 for
Keypad Lockout
MODE
To unlock the buttons, again press and hold the Mode
button. While holding the Mode button in, press the Up
and Down buttons in together. The Locked icon will
disappear from the display.
DRY CONTACT SWITCH - The terminals are 'normally open'.
Closing or completing the circuit will cause the thermostat
to enter Occupied 1. This feature allows an external
device such as a Central Time Clock, Occupancy Sensor,
or a Telephone activated device to force 1 or more
thermostats into
the thermostat must be in Program On. Set Occupied 1
to Off for all 7 days, so the Contact closure will be in
control. When the thermostat
via the Dry Contact
I2:00
Pm
We
unoccupied
On
Occupied 1. For the Dry Contact to work
is forced into Occupied 1
closure, the icon Occupied 1 will blink.
Important Note: For control of multiple
thermostats by 1 source, refer to
document P/N 88-175 'Potential Phasing
CK1
Problems' before installation.
GND
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OOL
Locked
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EAT