INVENTOR R2FI-50, User Manual, Page: 35 / 116

2.
●
B
C
D
A
Installation of connection pipe
1.
Align the center of the piping flare with the pyramidal face of relevant valve.
Screw in the flare nut by hand and then tighten the nut
with spanner and torque wrench refer to the following.
Spanner
Torque wrench
Indoor unit piping
Taper nut Piping
NOTE: Firstly connect the connection pipe to indoor unit, then to outdoor unit; pay attention
to the piping bending, do not damage the connection pipe; the joint nut couldn’t tighten too
much, otherwise it may cause leakage.
Exhausting(with A5mm hexagon wrench)
When using refrigerant of outdoor unit:
1. Tighten nuts A, B, C, D substantially.
2. Remove cover from check valve A (As show
in Fig.18)
3. Twist open core of liquid valve B with hexagon
wrench, and at the same time hold screw driver
against core of gas valve A to let gas out. After
15 seconds of exhausting and refrigerant appears,
close one-way valve and tighten bonnet.
4. Fully open cores of both liquid valve and gas valve,
tighten bonnet, then check with soap water or leakage
detector to see if there is any leaking in the joints of
piping between indoor and outdoor units.
Fig.18
Gas side
Outdoor unit
Indoor unit
Check valve Pipe joint
Joint nut
Limited block
Bonnet
Valve sterm
One-way valve
Installation of Indoor Unit
Hex nut
Tightening torque (N.m)
Ф
9.52
Ф
16 60
～
65
35
～
40
Ф
6
15
～
20
Ф
12
50
～
55
Ф
19
70
～
75
Air discharge method
Length of connection pipe Charge volume of additional refrigerant
Use refrigerant of Below 5m Volume on nameplate
Use vacuum pump
Use vacuum pump
5-15m
20-30m
outdoor unit
24K model Volume on na30g/m
48K model Volume on na100g/m
33