Initial Check - Hitachi CH-UNIT Installation And Operation Manual

CH UNIT INSTALLATION

4.2 INITIAL CHECK

Install the CH unit with a proper clearance around it for
−
maintenance working space, as shown in next figure.
2-Suspension Bolt
Upper Side
M10 or W3/8
(Field-Supplied)
Min. A
Bottom Side
Unit: mm
Electrical Box
Service Space
(300 x 300)
Service Access
Door
(450 x 450)
Min. 70
Min. A
Min. 70
Size
A
model
CH-6.0N1 300
CH-10.0N1 400
Check to ensure that the ceiling is sufficiently strong to
−
sustain the CH unit. If the ceiling is weak, abnormal sound
and vibration may occur.
The refrigerant flow sound may be heard from the CH unit
−
when the electric expansion valve in the CH unit is activated.
Therefore, take the following action to minimize the sound.
a) Install the CH unit inside the ceiling. As for the ceiling
material, select a material like a plaster board (at least
9mm) which minimizes operation sound.
b) Do not install the CH unit in a place near bed rooms or
hospital rooms.
The refrigerant flow sound may be head from the CH unit
−
when the operation is changed to cooling/heating mode.
Therefore install the CH unit in the ceiling of corridor so that
refrigerant flowing sound may not be heard in the room.
Do not install the CH unit in a hot or humid place like kitchen
−
to prevent dew condensation on the outer surface of the CH
unit.
When installing the CH unit in such places, apply additional
insulation.
Pay attention to the following points when the CH unit is
−
installed in a hospital or other facilities where there are
electronic waves from medical equipment.
a) Do not install the CH unit where the electromagnetic wave
is directly radiated to the electrical box or intermediate
wiring. (Operating Line)
b) Install the CH unit and components as far as practical or
at least 3 meters from the electromagnetic wave radiator.
c) Install a noise filter when the power supply emits harmful
noises.
The installation place should be convenient for the refrigerant
−
piping or electrical wiring connection.
Do not install the CH unit in the place with organic solvent
−
atmospheres, such as painting and cleaning factories.
Synthetic resin material may be damaged.
Do not install the CH unit in the place where flammable gas
−
may generate, drift or accumulate. Also avoid the place
where the carbon fabric may float.
PMML0204 rev.0-05/2010
13