Hitachi YUTAKI RAS-2WHVRP1 - Outdoor Unit Stop Valve Operation; Connecting Flare Adapter

8.2.1 Outdoor unit stop valve
Spindle Type
Stop valve
(liquid)
Stop valve
(gas)
Closed upon factory shipping
 Spindle valve
 Flare nut
 Cap
 Check joint for service port
Outdoor unit
Tightening Torque (Nm)
   
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
RAS-(2/2.5)WHVRP1 7-9 7-9 34-42 34-42 33-42 33-42 14-18 14-18
RAS-3WHVRP1 9-11 7-9 68-82 34-42 33-42 33-42 14-18 14-18
Refrigerant pressure
Closed before shipment
Refrigerant piping
Hexagonal wrench
(eld supplied) (*)
Spindle valve
Tighten the spindle with a torque above:
Counterclockwise…. Open
Clockwise ...........…. Close
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 3HP
Gas valve 4 mm 5 mm
Liquid valve 4 mm 4 mm
Do not apply two spanners
at this position. If applied,
leakage will occur
Stop valve
(Spindle type)
Flare nut
Use two spanners here
for pipe connection
Do not work with two
spanners here.
Refrigerant leakage
shall occur
! CAUTION
• 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 deagration if any ame or spark is produced close to
the unit. Harmful gases or difculties for breathing may occur in case
of leak.
8.2.2 Connecting are adapter
The piping sizes for indoor unit and outdoor unit are di󰀨erent.
Attach the are adapter (accessories) at the indoor piping union
part.
Use the adequate are adapter as follows:
Indoor unit
Flare adapter
Gas pipe Liquid pipe
2.0 HP
Big size
(∅15.88→∅12.70)
-
2.5 HP
Big size
(∅15.88→∅12.70)
Small size
(∅9.52→∅6.35)
3.0 HP -
Small size
(∅9.52→∅6.35)x2
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0576 rev.0 - 06/2021
9
EN