Hitachi UTOPIA IVX STANDARD Series - Page 21

ENGLISH
b. For the downward piping
Gas piping
Knock-out hole
Bottom base
Cables
Liquid piping
? NOTE
Cablesshallnotcontactdirectlytothepipes.
c. For the rear side piping
Rear Cover
? NOTE
Removethe rearpipe cover under the rearcover and remove
partfollowingtheslit.
2 Mount the piping cover in order to avoid water entering into
the unit. Seal the holes where pipes and wires are inserted,
by using a insulation (eld-supplied).
3 If the eld-supplied piping is connected with stop valves
directly, it is recommended use a tube bender.
4 Check to ensure that the stop valves are closed completely
before connecting pipes.
5 Connect the eld supplied refrigerant pipes to the indoor unit
and outdoor unit. Apply the oil thinly at the seat are nut and
pipe before tightening.
6 After connecting the refrigerant piping, seal the open space
between knockout hole and refrigerant pipes by using
insulation material.
7 Operation of stop valve should be performed according to
the gure below.
Outdoor unit stop valve
Spindle Type

Spindle valve

Flare nut

Cap

Check joint for service port
Closed upon factory shipping
Tightening Torque (Nm)
   
Liquid valve 7-9 33-42
33-42 14-18
Gas valve 9-11 68-82
Spindle Type
Nº Description Remarks

Cap

Allen wrench Hex 4 mm

Refrigerant Piping Field Supplied

Flare nut

Refrigerant
Pressure
To Outdoor Unit

Seat Surface Fully closed position

Check Joint
Only the charging those can be
connected

Charge port cap

O-Ring Rubber

Spindle valve
Open – Counterclockwise
Close – Clockwise
Do not apply two
spanners at this
position. If applied,
leakage will occur
Stop valve
(Spindle type)
Flare nut
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0395B rev.0 - 11/2015
11