Hitachi Set Free mini-HNRQ1 Series, Service Manual

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8
INSTALLATION
1.4 Model of Outdoor Unit
The number of indoor units that can be connected to an outdoor unit is defined in the following table :
Table 1.1 System Combination
Outdoor Unit Type
Min. Total Capacity of
the indoor units can be
connected
(kW)
Max. Total Capacity of
the indoor units can be
connected
(kW)
Numbers of the indoor
units can be connected
(Q’ty)
Min. Capacity at
Individual Operation
(kW)
RAS-3.0HNBRKQ1 4.0 10.40 2~4 2.2
RAS-3.5HNBRKQ1 5.0 13.00 2~5 2.2
RAS-4.0HNBRKQ1 5.6 14.56 2~6 2.2
RAS-4.5HNBRKQ1 6.0 15.60 2~6 2.2
RAS-5.0HNBRKQ1 7.0 18.20 2~7 2.2
RAS-6.0HNBRKQ1 8.0 20.80 2~8 2.2
RAS-6.5HNBRKQ1 9.0 23.40 2~9 2.2
RAS-7.0HNBRMQ1 10.0 26.00 2~10 2.2
RAS-8.0HNBRMQ1 11.2 29.10 2~10 2.2
RAS-10HNBRMQ1 14.1 36.50
2~10(13)
△ 2.2
RAS-11HNBRMQ1 15.5 40.30
2~10(14)
△ 2.2
RAS-12HNBRMQ1 16.8 43.60
2~10(15)
△ 2.2
Notes:
(1) The connectable indoor unit capacity ratio can be calculated as follows:
Connectable Indoor Unit Capacity Ratio = Total Indoor Unit Capacity / Total Outdoor Unit Capacity.
(2) It is suggested that the total capacity of indoor units which are operated simultaneously should not exceed the capacity of outdoor
units under the following conditions. Otherwise, there is a decrease in operating performance.
●
When there are some 4-way cassette indoor units and high wall indoor units in the system;
●
When the outdoor air temperature is 43°C or more during the outdoor unit cooling operation;
●
When the outdoor air temperature is lower than -10°C during the outdoor unit heating operation.
(3) When operating the outdoor unit under low heating load conditions and the outdoor temperature is 15°C WB or more, only one indoor
unit is in the operation, the outdoor unit will be Thermo-OFF* to protect the compressor from failure.
(4) *: When RAS-7.0~12HNBRMQ1 outdoor units are connected with the RCIM-0.8FSN4 or RCD-0.8~1.0FSN3 or RCS-0.8~1.0FSN,
if only one of these indoor unit is operating in cooling mode, the minimum outdoor temperature is limited to 5°C DB.
(5) For the same system, if the connectable indoor unit capacity ratio is over than 100%, and which all the indoor units operate
simultaneously, capacity of every indoor unit should be less than its rated capacity.
(6)
△ :
When the number of indoor units which are connected to the model of RAS-10~12HNBRMQ1 outdoor unit is over than 10 units,
the following restrictions are also required to meet.
(a) The piping system must be divided into two main pipes, the total capacity and the number of the units connected to each main
pipe should be as equal as possible.
(b) The maximum height difference between outdoor and indoor units is 30 meters and the maximum height difference between indoor
units is 10 meters, the longest piping length between the branch pipe to the connected indoor unit is 10 meters.
(c) The connectable indoor unit capacity ratio should not be more than 105%.
(d) Only 0.8~4.0HP of ducted indoor units can be selected.
No.1
No.10
No.2 No.3 No.4 No.5 No.6
No.7
No.8 No.9 No.11 No.12 No.13 No.14
No.15
*Thermo-ON: The outdoor unit and some indoor units are running;
Thermo-OFF: The outdoor unit and some indoor units are standby, but don’t run.