Installation manual
4
RRHQ+RRLQ006~008BAV3
Outdoor unit for air to water heat pump
4PW54244-1
6 When installing the unit in a place frequently exposed to snow,
pay special attention to elevate the foundation as high as
possible.
7 If you install the unit on a building frame,
please install a waterproof plate (field
supply) (within 150 mm of the underside of
the unit) or use a drain kit (refer to
combination table in "Possible options" on
page 3) in order to avoid the drainwater
dripping. (See figure).
Selecting a location in cold climates
■ To prevent exposure to wind, install the outdoor unit with its
suction side facing the wall.
■ Never install the outdoor unit at a site where the suction side
may be exposed directly to wind.
■ To prevent exposure to wind, install a baffle plate on the air
discharge side of the outdoor unit.
■ In heavy snowfall areas it is very important to select an
installation site where the snow will not affect the unit. If lateral
snowfall is possible, make sure that the heat exchanger coil is
not affected by the snow (if necessary construct a lateral
canopy).
Refrigerant piping specifications
Installing near a wall or obstacle
■ Where a wall or other obstacle is in the path of the outdoor unit
air intake or exhaust airflow, follow the installation guidelines
below.
■ For any of the installation patterns below, the wall height on the
exhaust side should be 1200 mm or less.
Wall facing one side (unit: mm)
Walls facing two sides (unit: mm)
Walls facing three sides (unit: mm)
NOTE
Units cannot be installed hanging from ceiling or
stacked.
CAUTION
When operating the outdoor unit in a low outdoor ambient
temperature, be sure to follow the instructions described
below.
Construct a large canopy.
Construct a pedestal.
Install the unit high enough off the ground
to prevent burying in snow.
CAUTION
■ Piping and other pressure containing parts shall
comply with the applicable national and international
regulations and shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for
refrigerant.
■ Installation shall be done by a licensed refrigerant
technician, the choice of materials and installation
shall comply with national and international
regulations. In Europe the EN378 is the application
standard that shall be used.
To persons in charge of piping work:
■ Be sure to open the stop valve after piping installing
and vacuming is complete. (Running the system with
the valve closed may break the compressor.)
■ It is forbidden to discharge refrigerant into the
atmosphere. Collect the refrigerant in accordance with
the freon collection and destruction law.
Refrigerant piping specifications
Maximum allowable piping length
between outdoor unit and indoor unit
30 m
Minimum required piping length
between outdoor unit and indoor unit
3 m
Maximum allowable height difference
between outdoor unit and indoor unit
20 m
Additional refrigerant required for
refrigerant pipe exceeding 10 m in
length
20 g/m
Gas pipe - outer diameter 15.9 mm (5/8")
Liquid pipe - outer diameter 6.4 mm (1/4")
>100 >350
≤1200
>50
>50
>350
>100
>100
>350
>50
1D_IM_4PW54244-1.book Page 4 Friday, October 30, 2009 8:20 AM
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