7
English
2.5 NIGHTTIME FREE COOLING OPERATION
〈
AUTOMATIC HEAT PORGE FUNCTION AT NIGHT
〉
The nighttime free cooling is an energy-conserving function
which works at night when the air conditioners is off, reducing
the cooling load in the morning when the air conditioner is
turned on by ventilating rooms which contain office equipment
which raises the room temperature.
• Nighttime free cooling only works during cooling and when
connected to Building Multi or VRV systems.
• Nighttime free cooling is set to “off” in the factory settings; so
request your dealer to turn it on if you intend to use it.
Operation image
(a) Outside temperature
(b) Indoor temperature
(c) Set temperature
(d) Operating state of Air conditioner
(e) Operating state of Total heat exchanger
EXPLANATION OF NIGHTTIME FREE COOLING
OPERATION IMAGE
The unit compares the indoor and outdoor temperatures after
the air conditioning operation stops for the night. If the following
conditions are satisfied, the operation starts, and when the
indoor temperature reaches the air conditioning setting, the
operation stops.
<Conditions>
[1] the indoor temperature is higher than the air conditioning
setting and
[2] the outdoor temperature is lower than the indoor tempera-
ture,
If the above conditions are not satisfied, reevaluation is made
every 60 minutes.
3
OPERATION PROCEDURE
3.1 COOLING, HEATING, AND FAN ONLY OPERA-
TION (Refer to figure 5)
[PREPARATIONS]
• To protect the unit, turn on the main power switch 6 hours
before operation.
Do not turn off the power during the heating or cooling sea-
son. This is to ensure smooth start-up.
Press the operation mode selector button several times
and select the operation mode of your choice;
“
” Cooling operation
“
” Heating operation
“
” Fan only operation
NOTE
• “
” can only be set for systems operating in cooling and
heating at the same time.
“
” is displayed on all remote controllers when
using the VRV
ΙΙ
system cooling only type, but only “
” and
“
” can be set.
• Select the operating mode on a remote controller on which
“
” is not displayed.
“
” “
” and “
” (only for simultaneous cooling/heat-
ing systems) cannot be selected on remote controllers on
which it is displayed.
See 3.2 if “
” is displayed.
Press ventilation mode selector button if you wish to
change the mode.
The display rotates through the following selections
every time the button is pressed.
NOTE
• Above is available only if the remote controller BRC1D527 is
connected with this unit.
It is unnecessary to change ventilation mode because the
mode is already set to “automatic mode”.
• If you change this mode with BRC1A62, consult your dealer.
Press ventilation fan speed button if you wish to change
the fan speed.
The display rotates through the following selections
every time the button is pressed.
After the selection, the ventilation fan speed display dis-
appears.
And the fan speed of the combined air conditioner regu-
larly displays.
NOTE
• Above is available only if the remote controller BRC1D527 is
connected with this unit.
• It is unnecessary to change four speed mode because the
mode is already set to “Low” or “High” mode by the installer.
• If you want to know or change this mode with BRC1A62 con-
sult your dealer.
Press the on/off button.
The operation lamp lights up and the system starts oper-
ation.
Stopping the system
Press start/stop one more time. The operation lamp will go off.
The unit will stop.
• After stopping operation, the fan may continue operating for
up to a minute.
• The fan may stop, but this is not a malfunction.
OFF
ON
ON
OFF
OFF
OFF
40
30
20
(time)
Following morning
22:00
24:00
(d)
(e)
Oper
ating state
T
emper
ature (˚C)
Nighttime free cooling operation
(a)
(b)
(c)
1
2
Automatic mode
Heat exchange mode
Bypass mode
3
Low
High
L
H
4
01_EN_3P130767-3G.fm Page 7 Monday, March 5, 2007 10:05 AM
