Installation; Mounting On Truss; Separating Indoor Unit (If Required) (Only For 3.0 - 6.0Hp Models) - Hitachi RPI-3.0FSN2SQ Installation & Maintenance Manual

IN-THE-CEILING (DUCT)
4.3

Installation

4.3.1 Mounting on Truss

In the case that the indoor unit is installed in the
false ceiling space without hanging, pay attention
to the following items.
(1) Apply vibration absorbing mats (10t) under
the indoor unit.
< RPI-3.0FSN2SQ - RPI-6.0FSN2SQ >
Vibration Absorbing
Mat (10t)
P
Wooden Bar
Place the three wooden bars on the
truss as showing in the figure.
Note that the middle wooden bar should be placed
in the center position of the unit.
Truss
< RPI-7.0FSN2SQ >
P
Truss
Field-Supplied Wooden Bar
Place the three wooden bars on the
truss as showing in the figure.
Note that the middle wooden bar should
be placed in the center position of the unit.
View from
Wooden Bar
(2) Apply an auxiliary drain under the indoor unit
if the ambient humidity is higher than 80%
(RH).
10
2-16
Indoor Unit
Truss
View from P
Vibration Absorbing
Mat (10t)
Wooden Bar
Vibration Absorbing
Mat (10t)
P
Truss
Vibration Absorbing
Mat (10t)
4.3.2 Separating Indoor Unit (If Required)
(Only for 3.0 - 6.0HP Models)
ATTENTION:
Separate the indoor unit only when necessary.
Separate the indoor unit in the following order.
(1) Remove the 4 bolts (M6) on the back of the
supply air box (Fig. 4.2).
(2) Carefully pull the fan cover away, taking care
not to damage the fan motor wiring (Fig. 4.2).
Supply Air
Electrical Box
Fig. 4.2
(3) If further disassembly is required, unplug the
fan motor connector (Fig. 4.3).
(4) Remove the 5 bolts (M6) securing the
fan assembly to the heat exchanger
compartment. The fan assembly will be
lifted off (Fig. 4.3).
When removing the fan assembly, loosen the
screws and lift off the fan assembly.
When attaching the fan assembly,
mount it onto the screws as shown.
Thermistor
for Air Inlet Temp.
Connector
Electrical Box for Fan Motor
NOTES:
1) The fan cover has sharp edges. Take care not to
injure yourself when handling.
2) Ensure not to damage or deform the air inlet
temperature thermistor.
3) Check to ensure that the connector for the fan motor is
connected to the unit.
4) Attach the fan cover as shown in the figure.
5) Tighten the screws securely.
If they are loose, vibration or noise will occur.
Fig. 4.3 Removing Fan Assembly
Heat Exchanger
Compartment
Fan Cover
Return Air
Heat Exchanger
Compartment
Fan Assembly
Fan Support
Fan Assembly
Fan Cover
P5414985
TC-12001