898147-UUM-B-0713
Johnson Controls Unitary Products
3
DUCTLESS SYSTEM OPERATION
MUTI-SPLITS APPLICATION ONLY
In a multi-split application, the operating mode is determined by the
zone that initiates the first demand for heating or cooling. If the system
is energized and a heating demand has been initiated by zone 1, an
error code (E7) will be displayed of the front panel of the indoor unit of
any zone trying to initiate a cooling demand. The zone 1 remote (and
remotes for other zones calling for heating) must be powered off in
order to allow the system operating mode to switch to the cooling mode.
Once the zone initiates the cooling demand, the mode will have to be
reset in the same way to allow a heating demand in another zone. This
situation occurs only when there are very different requirements in two
or more zones in the system.
SINGLE SPLIT AND MULTI-SPLITS APPLICATIONS
COOLING MODE OPERATION
1.
Cooling Mode Operation Principles -
In the cooling mode, the
indoor coil absorbs the heat from the room and transfers it to the
outdoor coil where it is discharged. The system cooling capacity is
affected by the outdoor ambient temperature. The indoor fan oper-
ates continuously in cooling mode even when the cooling setpoint
temperature is reached. The indoor unit swing louver is fixed in an
upward position. The cooling operating range of the outdoor unit is
typically from 5°F (-15°C) to 115°F (46°C) for small capacity sys-
tems (9K & 12K) and 14°F (-10°C) to 115°F (46°C) for large capac-
ity systems (18+K).
2.
Anti-Freezing Protection in Cooling Mode -
If the unit is running
in cooling mode and frost starts forming on the indoor coil, the out-
door unit compressor will stop to protect your ductless system.
HEATING OPERATION
1.
Heating Operation Principles -
The refrigerant flow is reversed
during the heating cycle. The outdoor coil absorbs the heat from
outside and transfers it to the indoor coil where it is discharged into
the living space. The system heating capacity is also affected by
the outdoor ambient temperature. In heating mode, the indoor
blower will continue to operate for 60 seconds after the outdoor unit
shuts off. The indoor unit swing louver is fixed in a downward posi-
tion. The heating operating range of the outdoor unit is from 19 °F (-
7°C) to 75°F (24°C). In extreme low temperature conditions, it may
be necessary to supplement heating using other means such as
space heater, fireplace, etc.
2.
Auto Defrost -
When the outdoor temperature is low and/or with
high humidity, frost may form on the outdoor coil, reducing the abil-
ity of the unit to transfer energy. The unit will go into Auto Defrost
mode and the heating will be discontinued for 8 to 10 minutes.
When the defrost cycle is complete, the system will start running in
heating mode. While the outdoor unit is in defrost mode, the follow-
ing occur:
• The fan motors of the indoor and outdoor units will stop running.
• The indoor unit indicator flashes, and moisture may flow from the
outdoor unit and steam may be observed.
3.
Cold Air Prevention - Hot Heat Pump -
In heating mode, if the
indoor coil has not achieved a certain temperature, the indoor fan
will not operate for up to 3 minutes. This may occur during:
• Initial start-up of a heating cycle
• Immediately after completion of an Auto mode operation
• Heating under extremely low indoor temperatures
AUTO MODE OPERATION
When AUTO mode is selected, the setpoint temperatures in heating
and cooling modes are predetermined. When AUTO mode is activated,
the remote control temperature setpoint and fan operation cannot be
adjusted.
1.
AUTO Mode - Cooling Operation -
If the indoor ambient tempera-
ture is greater than 77°F (25°C), the ductless system will operate in
cooling mode and will continue to run until the indoor ambient tem-
perature reaches 75°F (24°C). At this point, the outdoor unit's com-
pressor and outdoor fan will operate for another 60 seconds, then
they will both turn off. The indoor fan will run continuously at a
speed determined by the indoor ambient temperature. When the
system is in AUTO mode and in cooling operation, the indoor unit
swinging louver is fixed in an upward position.
2.
Auto Mode - Heating Operation (heat pump only) -
If the indoor
ambient temperature is less than 68°F (20°C), the system will oper-
ate in heating mode and will continue to run until the indoor ambient
temperature reaches 69°F (21°C). At this point, the outdoor unit's
compressor and outdoor fan will operate for another 60 seconds,
then they will both turn off. The indoor fan will run continuously at a
speed determined by the indoor ambient temperature. When the
system is in AUTO mode and in heating operation, the indoor unit
swing louver is fixed in a downward position.
FAN MODE OPERATION
When the system is set to operate in FAN mode, the indoor fan runs
continuously in AUTO, low, medium or high speed. The outdoor unit is
off. In AUTO fan mode, the fan speed is determined by the indoor ambi-
ent air temperature.
DRY MODE OPERATION
When the system is set to operate in DRY mode, the indoor fan runs
continuously at low speed to maximize indoor air moisture removal.
TYPICAL INSTALLATION
SINGLE SPLIT
FIGURE 1:
Single-Split Indoor
ON/OFF
* To be provided at field
INDOOR UNIT
OUTDOOR UNIT
AIR IN
AIR IN
AIR OUT
AIR OUT
1
2
3
8
4
5
7
6
2
1. Power Cable*
2. Remote Control
3. Front Panel
4. Filter
5. Guide Louver
6. Wall Pipe
7 Bind Tape
8. Drainage Pipe
