Mitsubishi Electric Y Series Manual page 240

Installation Information
240
3. Precautions for fresh air intake-type indoor unit
3-1. Usage
♦The fresh air intake-type indoor unit is designed to supply pretreated outside air into the room. Do not use to
handle internal thermal load.
3-2. Unit characteristics
For PEFY-P-VMH-E-F and PEFY-P-VMHS-E-F
♦This unit cannot perform drying operation. The unit will continue fan operation and blow fresh air (air that is not
air-conditioned) when the Heating Thermo OFF or Cooling Thermo OFF mode is selected.
♦The fan may stop temporarily when the unit is connected to a simultaneous cooling/heating operation-type
outdoor/heat source unit (R2, WR2-Series) or during the defrost cycle.
♦If only this unit is used as an indoor unit, condensation may form at the supply air grille while the unit is
operated in cooling mode. This unit cannot perform dehumidifying operation.
♦The maximum connectable indoor units for 1 outdoor unit is 110% (100% in case of heating below -5°C).
♦When fresh air intake-type indoor units are connected to an outdoor unit together with other types of indoor
unit, the total capacity of the fresh air intake-type indoor units must be no more than 30% of the capacity of the
connected outdoor unit.
♦The AUTO mode on the local remote controller is available only when the fresh air intake-type indoor unit is
connected to the R2 or WR2-Series outdoor units.
♦The system changeover function is available only when all the connected indoor units are fresh air intake-type
indoor units.
♦Untreated outside air such as humid air or cold air will be blown into the indoor environment during Thermo
OFF operation, which may cause dew condensation on the grilles and ducts. Ensure that the grilles, ducts, and
rooms are properly insulated to prevent dew condensation.
♦An air filter must be installed in the air intake side. The filter should be attached where easy maintenance is
possible if using locally procured filters.
For PEFY-P-VMH-E-F
♦Outside air temperature ranges for the operation must be as follows:
Cooling: 21ºCD.B./15.5ºCW.B. ~ 43ºCD.B./35ºCW.B.
Heating: -10ºCD.B.~ 20ºCD.B.
The unit is forced to operate Thermo OFF (fan operation) when the outside air temperature is as follows.
Cooling: 21ºCD.B. or below; Heating: 20ºCD.B. or above
♦This unit switches the Thermo ON or OFF depending on the room temperature. The outside air is directly
supplied into the room during Thermo OFF. Take caution of the cold supply air due to low outside air
temperature and of condensation in the room due to high humidity of the outside air.
♦Either a remote controller (sold separately) or a remote sensor (sold separately) must be installed to monitor
the room temperature.
♦Use the unit in the way that the airflow rate will not exceed the 110% of the rated airflow.
♦Depending on the air conditioning load, outside temperature, and due to the activation of protection functions,
the discharge temperature may swing. Note that untreated outside air may be delivered directly into the room
upon the activation of protection functions.
For PEFY-P-VMHS-E-F
♦The outside air temperature ranges for operation are as follows:
Cooling: 17ºCD.B./15.5ºCW.B.–43ºCD.B./35ºCW.B.
Heating: -10ºCD.B.–+20ºCD.B.
The unit is forced to operate in Thermo OFF (fan operation) mode when the outside air temperature is as
follows:
Cooling: 17ºCD.B. or below
Heating: 20ºCD.B. or above