Daikin 910121750 Installation Operation & Maintenance Download

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IOM 1178-1 / Page 11 of 16

Operating Your Thermostat

Cooling/Dehumidifier

1. Press SYSTEM to select “Cool”.

2. Press to adjust the thermostat setting below room

temperature. The fan should come on immediately on
high speed, followed by cold air circulation. The display
should show “System On”. If the setpoint temperature

display is flashing, the compressor lockout feature is op

erating (see

page 8,

#11. Select Temperature Display

Adjustment 5 LO to 5 HI on).

3. Adjust temperature setting to 3° below room temperature.

The second stage cooling should begin to operate and the
display should show “System On +2”.

4. Press to adjust the temperature setting above room tem-

perature. The cooling system should stop operating.

If The Thermostat Is Configured For Dehumidification:

To check the dehumidifier when System On appears and the

cooling system is running press *HUMIDITY button once.

Press to adjust the humidity 2% or more below the room

humidity level. DeHum On will appear indicating it is calling

for the dehumidification.

If the room humidity is lower than the adjustment range, press
to 40% and hold it for four seconds. This will force the De-

Hum On for one complete cooling cycle to test the dehumidi

fication equipment.

After adjusting the humidity setting the display will return to
temperature in approximately 10 seconds. To switch the dis-
play back to temperature immediately after adjusting humid-

ity setting press HUMIDITY again.

Note:

If Auto Schedule is displayed instead of Humidity, Auto

Schedule must be turned off in the Configuration Menu.

If The Thermostat Is Configured For Economizer:

When the cool set point is 1.0 degree F below the space tempera

ture the DH/A output is enabled and the System On icon flashes

Choose The Fan Setting (Auto or On)

Fan Auto is the most commonly selected setting and runs the
fan only when the heating or cooling system is on.

Fan On selection runs the fan continuously for increased air
circulation or to allow additional air cleaning.

Tip:

Running the fan more frequently will increase your

energy consumption. Most systems use a 1/2 or 1/3

HP electric motor to power the fan.

Choose The System Setting (Cool, Off,
Heat, Auto)

Press the SYSTEM key to select:

Cool:

Thermostat controls only the cooling system.

Off:

Heating and Cooling systems are off.

Heat:

Thermostat controls only the heating system.

Auto:

Auto Changeover is used in areas where both heating

and cooling may be required on the same day. AUTO allows
the thermostat to automatically select heating or cooling
depending on the indoor temperature and the selected heat

and cool temperatures. When using AUTO, be sure to set the

Cooling temperatures more than 1° Fahrenheit higher than the
heating temperature.

Manual Operation For Non-Programmable

Mode

Press the SYSTEM key to select “Heat” or “Cool” and use

the keys to adjust the temperature to your desired setting.

After selecting your desired settings you can also press the
SYSTEM key to select AUTO to allow the thermostat to

automatically change between “Heat” and “Cool”.

Manual Operation (Bypassing The

Program) Programmable Mode

Manual operation will bypass the program and allow you to
adjust the temperature as you desire. The temperature you set

in Hold will be maintained indefinitely. Press or to adjust the

temperature. The HOLD key will appear. Press the HOLD

key. “Hold At” will appear next to the setpoint temperature

and the thermostat will maintain the new setpoint temperature
until Run Schedule is pressed to resume program operation.

Program Override (Temporary Override)

Press or keys to adjust the temperature. This will override the
temperature setting for a (default) four hour override period.
The override period can be shortened by pressing or length-
ened by pressing. Program Override period can range from 15
minutes to 7 days.

Example:

If you turn up the heat during the morning pro-

gram, it will be automatically lowered later, when the tempo-
rary hold period ends. To cancel the temporary setting at any
time and return to the program, press Run Schedule.

If the SYSTEM key is pressed to select AUTO the thermo-

stat will change to “Heat” or “Cool”, whichever ran last. If

it switches to “Heat”, but you want “Cool”, or it changes to

“Cool”, but you want “Heat”, press both keys simultaneously

to change to the other mode.

Set Current Time And Day

1. Press Menu key to enter installer menu. Then press Set

Time once to indicate hour & AM or PM designation in

clock display.

2. Press and hold either the

touch key until you

reach the correct hour and AM or PM designation.