How To Operate; When Interlocked With An Indoor Unit; When Not Interlocked With An Indoor Unit; Before Starting Operation - Mitsubishi Electric Fresh Master GUF-100RDH3 Operating Instructions Manual

3. How to operate

3.1. When interlocked with an indoor
unit
• Operation will be synchronized with an indoor unit.
• The humidifier will be operated by the heating signal received from
the indoor unit. (For GUF-50, 100RDH3)
• In the case of GUF-50, 100RDH3, there is no temperature control
since the temperature is adjusted according to the outside air tem-
perature.
Starting and stopping operation
• Using the Remote controller to start or stop the indoor unit will au-
tomatically start or stop the Fresh Master.
Operation modes
• The Fresh Master will operate in the same mode as the synchro-
nized indoor unit (heat, cool and fan).
• The Fresh Master will be cool when the indoor unit is operated in
dry mode.
When using with multiple indoor units
• When using with multiple indoor units that are set differently, the Fresh
Master will operate in the mode with priority of: heat, cool and fan.
When operating only the Fresh Master
• The Fresh Master can be operated independently by pressing the
Ventilation button on the Remote controller (in this case, the opera-
tion mode will be fan).
• Pressing the Ventilation button each time will switch the display
between Stop, Low and High.
Stop
3.2. When not interlocked with an
indoor unit
• GUF-50, 100RD3 will adjust the temperature according to the in-
door temperature set using the Remote controller.
• In the case of GUF-50, 100RDH3, there is no temperature control since
the temperature is adjusted according to the outside air temperature.

3.2.1. Before starting operation

• Make sure that the power supply is turned ON before use.
(Keep the power supply turned ON at all times when the Fresh Master is
in use. Use of the unit without power can result in compressor failure.)
• Start running after the "HO" display has disappeared. The "HO"
display briefly appears on the room temperature display (max. 10
minutes) when the power is turned on and after a power failure.
This does not indicate any failure of the Fresh Master.
• The operation modes of the Fresh Master air-cooling operation and
heating operation are different from those of the outdoor units.
When the operation is started with cooling/heating and other in-
door units or the Fresh Master connected to the counterpart out-
door units are already running in the same operation mode, the
Remote controller displays air-cooling/heating mode. However, the
operation comes to stop, and you cannot get a desired mode. When
this occurs, you will be notified by the "cool" or "heating" display
that flashes in the liquid crystal display of the Remote controller.
Set to the operation mode of other indoor unit or the Fresh Master
by the operation switch button.
The above does not apply to the models that simultaneously run
both the cooling operation and heating operation.
• The outdoor units stop when all the indoor units and the Fresh
Master connected to the counterpart outdoor units stop.
• During heating operation, even if the indoor unit or the Fresh Master is
set to operation while the outdoor unit is in defrosting operation, opera-
tion starts after the defrosting operation of the outdoor unit has ended.
Low High
Warning:
Check and confirm the power circuit before use. For contents,
refer to the previously described chapter [Crucial points to be
observed for safety].

3.2.2 ON/OFF

Operation lamp
˚C
TEMP.
CLOCK→ON→OFF
TIMER SET
PAR-F27MEA
Start an operation
Press [ON/OFF] button
Operation lamp lights up and operation starts.
Stop an operation
Press the [ON/OFF] button again
Operation lamp goes off and operation stops.
• Once the buttons have been set, pressing of the [ON/OFF] button
only can repeat the same operation thereafter.
• During operation, the operation lamp above the [ON/OFF] button
lights up.
Caution:
Even if the operation button is pressed immediately after the op-
eration has stopped, operation will not restart for about 3 min-
utes. This function protects the machine. It automatically starts
operation after approximately 3 minutes.

3.2.3. Selecting operation

Operation mode
[selecting operation]
button
PAR-F27MEA
When selecting operation
Press the [selecting operation] button
• Consecutive press of the selecting operation button switches the
operation over to "cooling," "fan," "(automatic)," and "heating." For
the contents of operation, check the display.
For cooling
Press the [selecting operation] button and bring up the "cooling"
display
˚C
ON/OFF
[ON/OFF] button
FILTER
CHECK TEST
˚C
˚C
TEMP.
ON/OFF
CLOCK→ON→OFF FILTER
CHECK TEST
TIMER SET
7