INVENTOR RFI-66B, User Manual

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Notes for piping
Pipes for refrigerant and drainage should be insulated to avoid frosting and dripping.
Both of the indoor and outdoor units adopt flare-end connection.
Refrigerant pipe as shown below is used to connect indoor and outdoor units.
Note: Don’t bend the bendable pipe back and forth more than 3 times.
Note: Insulate all exposed parts of the flare-end connection joint and the refrigerant pipe.
2. When using copper pipe bought locally
Check valve of the outdoor unit should be shut (like position unworking). After the refrigerant pipe has been con-
nected to both indoor and outdoor units, exhaust from service mouth on low-pressure check valve of the outdoor
unit. After exhausting, put back nut of the service mouth and fasten.
3. After finishing step 1 and 2, check valve of outdoor unit should be fully open so that there is not blockage between
the indoor and outdoor refrigerant pipe.
Note: before fastening nut of the flare-end pipe, please apply some refrigerant oil to the end of the pipe and the joint.
1. Connecting the pipe
Check valve of the outdoor unit should be shut (like position unworking). Every time when connecting, remove
bonnet from the check valve and connect to flare-end pipe immediately (within five minutes), otherwise dust, mois-
ture and other small things may go into the pipe and cause troubles.
About the bendable pipe
The part with bendable pipe should be used on the indoor side.
The bending angle should not be more than 90.
It’s better for the bend to be in the middle of the pipe, and the radius of the bend is the bigger the better.
Don’t bend the bendable pipe more than three times.
When bending the pipe
Cut some part of the insulation pipe at the place of the bend (and wrap with polythene tape after bending)
Make radius of the bend as big as possible so that the pipe will not get flat or broken.
Indoor unit
Bendable pipe
19 1
Flare-end connection
12 1
Outdoor unit
Polythene tape
Insulation cover
Loosen the roll of pipe
Straighten end of pipe
Bend the pipe with thumb
Minimum radius: 100mm