INVENTOR R2FO-50 User Manual page 35

Installation of Indoor Unit
1.
Align the center of the piping flare with the pyramidal face of relevant valve.
2.
Screw in the flare nut by hand and then tighten the nut
with spanner and torque wrench refer to the following.
Hex nut
Ф 6
Ф 9.52
Ф 12
Ф 16
Ф 19
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.
●
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.
Air discharge method
Use refrigerant of
outdoor unit
Use vacuum pump
Use vacuum pump
Installation of connection pipe
Tightening torque (N . m)
15～20
35～40
50～55
60～65
70～75
Exhausting(with A5mm hexagon wrench)
Length of connection pipe
Below 5m
5-15m
20-30m
Indoor unit piping
Spanner
Outdoor unit
Check valve
Fig.18
One-way valve
Charge volume of additional refrigerant
Volume on nameplate
24K model Volume on nameplate+30g/m
48K model Volume on nameplate+100g/m
33
Taper nut Piping
Torque wrench
Gas side
Indoor unit
C
A
D
B
Pipe joint
Joint nut
Limited block
Bonnet
Valve sterm