Hitachi RAS-2WHVRP Instruction Manual page 21

REFRIGERANT PIPING & REFRIGERANT CHARGE
8.2.1 Outdoor unit stop valve
Spindle Type
 Spindle valve
 Flare nut
 Cap
 Check joint for service port
Spindle valve
Tighten the spindle with a torque above:
Counterclockwise.... Open
Clockwise .... Close
Closed before shipment
Check joint
(Only charging hose can be connected)
Tighten the cap with 16 N.m torque
Cap
Tighten the cap with 37 N.m torque
(Attach this after work)
Hexagonal wrench size used for spindle valve:
(*) Size 2hP, 2.5hP
Gas valve
Liquid valve
Do not apply two spanners
at this position. If applied,
leakage will occur
Do not work with two
spanners here.
Refrigerant leakage
shall occur
Use two spanners here
for pipe connection
9 PMML0509 rev.0 - 02/2019
Stop valve
(liquid)
Stop valve
(gas)
Closed upon factory shipping
Refrigerant pressure
Refrigerant piping
Hexagonal wrench
(field supplied) (*)
3hP
4 mm 5 mm
4 mm 4 mm
Stop valve
(Spindle type)
Flare nut

Outdoor unit
gas liquid
valve valve
RAS-(2/2.5)whvRP
7-9 7-9
RAS-3whvRP 9-11 7-9
!
C A U T I O N
• At the test run, fully open the spindle and ball stop valve.
• If not fully opened, the devices will be damaged.
• Do not attempt to turn service valve rod beyond its stop.
• Do not loosen the stop ring. If the stop ring is loosened, it is dangerous
since the spindle will hop out.
• An excess or a shortage of refrigerant is the main cause of trouble
to the units. Charge the correct refrigerant quantity according to the
description of label at the inside of service cover.
• Deeply check for refrigerant leak. If a refrigerant leak occurs, it may
cause risk of deflagration if any flame or spark is produced close to
the unit. Harmful gases or difficulties for breathing may occur in case
of leak.
8.2.2 Connecting flare adapter
The piping sizes for indoor unit and outdoor unit are different.
Attach the flare adapter (accessories) at the indoor piping union
part.
Use the adequate flare adapter as follows:
Indoor unit
2.0 HP
2.5 HP
3.0 HP
Tightening Torque (Nm)
 
gas liquid gas liquid
valve valve valve valve valve
34-42 34-42 33-42 33-42 14-18
68-82 34-42 33-42 33-42 14-18
Flare adapter
gas pipe liquid pipe
Big size
( 15.88→ 12.70)
∅ ∅
Big size Small size
( 15.88→ 12.70) ( 9.52→
∅ ∅ ∅
Small size
-
( 9.52→
∅

gas liquid
valve
14-18
14-18
-
6.35)
∅
6.35)x2
∅