Hitachi RPI-0.8FSG1 Service Manual page 370

FIELD WORK INSTRUCTION
<Attention for Installing CH Unit>
Before installing the CH units, pay attention to the service access and sound.
(1) The CH unit consists of mechanical components such as solenoid valves in order to change the
operation mode from cooling to heating or heating to cooling respectively.
Therefore, please provide a service access door (minimum of 600✕600mm) beneath the CH unit.
(2) Flowing sound of refrigerant may be heard from the CH unit when the solenoid valve in the CH unit is
activated. Therefore, take the following action to minimize the sound.
* Install the CH unit inside the ceiling.
As for the ceiling material, select a material like a plaster board which minimizes operation sound.
* Do not install the CH units in near a bed room or hospital room.
(3) Install the CH units according to the below table.
Correct
Outdoor Unit
CH Unit
1 2
l +l , l +l
0 1 2 3,
l : Max 30m
4
* CH units are installed according to the below table.
* The piping length between the 1st multi-kit and the farthest indoor unit is within 30m.
* The total piping length between each multi-kit and each indoor unit is within 30m.
* The maximum lift among indoor units is within 15m.
* The maximum lift between the outdoor unit and the indoor unit is within 50m (In the case that the
position of the outdoor unit is higher than that of the indoor unit) / 40m (In the case that the position of
the outdoor unit is lower than that of the indoor unit)
5-10
L: Max. 100m (Actual)
Max. 125m (Equivalent)
l: Max. 30m
3
l
4
Indoor Unit
H2: Max. 4m
Height Difference among CH Unit
Lowest Indoor Unit
Installed Higher
than Outdoor Unit
Lowest Indoor Unit
Installed Lower
than Outdoor Unit
CH Unit
Indoor Unit
l +l , l
0 1
l l : Max. 30m
4+ 5
Less than 15m
(Max. Indoor Unit: 16 Units)
Height Difference
of CH Unit
0 to 3m
3.1 to 5m
5.1 to 6m
Outdoor Unit
1 2 3
L: Max. 100m (Actual)
+l
2 3,
Max. 125m (Equivalent)
Max. Connectable
CH Unit
Up to 16
Up to 10
Up to 8
l: Max. 30m