Hitachi RCD-2.5FSN2, Service Manual

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2 Unit installation
70
SMGB0077 rev.0 - 01/2013
2.10 DX-Interface
2.10.1 Accesories supplied with the unit
Check that the following accessories are supplied with the unit.
N O T E
Please contact your HITACHI distributor if any of the accessories has not been supplied with the unit.
Accessory Appearance Quantity Purpose
Control box 1 System control box
Expansion valve box 1
Expansion valve for refrigerant cycle
control
Thermistor 4
Temperature sensing:
inlet air (blue)
outlet air (red)
gas line (yellow)
liquid line (black)
Control box fixing accessory 4 Control box cover lock
Harness jumper 1 Motor alarm connection jumper
2.10.2 Unit installation
• The installation of a specific remote controller is necessary during the installation comissioning. Once the installation
commissioning is finished, this remote controller can be removed if the pin 7 is switched to ON position. In this case, pay
attention to all the setting details related with the remote controller because after remove it, they cannot be changed.
• Do not install the DX-Interface where electromagnetic wave is directly radiated to the control box or expansion valve box.
• Install a noise filter when noise is emitted from power supply.
• Do not install the DX-Interface where generation, flowing, staying or leakage of flammable gas may occur.
• When the false ceiling contains high humidity, dew condensation water may occur on the outer surface of the expansion
valve box. Therefore utilize the insulation on the outer surface of the expansion valve box.
Installation Location
1
Installation methods are selectable according to the dimension of the false ceiling.
2
Keep the distance between the unit or device with heat exchanger and the expansion valve box for the piping length
up to 5m. Also the elevation difference between the unit or device with heat exchanger and the expansion valve box
must be no more than 2m.
3 Check the ceiling slab is strong enough. If the ceiling slab is too weak to support the weight of the expansion valve box,
noise and vibration may occur.
4 Secure proper space around the control box and expansion valve box for operation and maintenance work. Also a ser-
vice access door should be prepared in order to remove the DXInterface without getting rid of the ceiling plate.
5 Select a suitable and convenient location for the refrigerant piping connection.
6 Do not install the DX-Interface in a kitchen where vapor or mist flows. Dew condensation water may occur on the ex -
pansion valve box while cooling operation. In this case, utilize the insulation.
7 Do not install the DX-Interface in a organic solvent (thinner or benzine) environment. Synthetic resin parts may dissolve.
8 Do not install the DX-Interface where generation, flowing or staying of flammable gas may occur.
9 The sound of refrigerant running through from the expansion valve box may be heard. Therefore install the expansion
valve box where the sound will not leak such as in the false ceiling of a hall way.
10
Use ceiling material with sound-proof such as plaster board.