Installation Procedure; Cautions In Piping Installation - Carrier XCT7 Installations- Und Benutzerhandbuch

Installation Procedure

A. Refrigerant pipe connection
Pipe connection methods:
• To ensure efficiency, the pipe should be as short as possible.
• Daub the refrigerant oil on the connector and the flare nut.
• When bending the pipe, the bending semi-diameter should be as
large as possible to prevent the pipe from getting broken or bent.
• When connecting the pipe, aim at the centre to thread the nut
by hand and tighten it with the double spanners.
• For Fastening torque, please refer to "pipe specs and
fastening torque" on page 15.
• Don't let the impurities such as sand, water etc. enter the pipe.
For antifouling measures refer to Page 13.

Cautions in piping installation:

1. When welding the pipe with hard solder, flow nitrogen into the pipe to prevent internal oxidation. The pressure
gauge should be set at 0.02MPa. Perform the procedure with nitrogen circulation to prevent the oxide film in the
pipe from clogging the capillary and expansion valve and resulting in an accident.
2. The refrigerant pipe should be clean. If the water and the other impurities enter the pipe, use nitrogen to clean the
pipe. The nitrogen should flow under the pressure of about 0.5MPa . When blowing the nitrogen, close one end of
the pipe by hand to enhance the pressure in the pipe, then loosen the pressure of the hand (meanwhile close the
other open end).
3. The installation of the piping should be executed after closing the stop valves.
4. When welding the valve and the pipe, cool down the valve with a wet towel.
5. please use the special shears to cut the connection pipe and the branch pipe. Do not use a saw. When welding
copper pipe, use the phosphor copper welding rod without any welding flux. (welding flux will damage the piping
system. The welding flux containing chlorine will corrode the pipe, especially, the welding flux with fluorine will dam-
age the refrigeration oil.)
Pipe material and specs selection
1. Please select the refrigerant pipe of the below material. Material: the phosphoric oxidize seamless copper pipe,
model: C1220T-1/2H (diameter is over 19.05); C1220T-0(diameter is below 15.88).
2. Thickness and specs:
Confirm the pipe thickness and specs according to the pipe selection method (the unit is with R410A, if the pipe
over 19.05 is O-type, the pressure preservation will be bad, thus it must be 1/2H type and over the min. thickness.
3. The branch pipe and the gather pipe must be from Carrier.
4. When installing the stop valve, refer to the relative operation instruction.
5. The pipe installation should be in the allowable range.
6. The installation of branch pipe and gather pipe should be performed according to the relative manual.
Anti-fouling measures
First, clean the pipe.
Position
Outdoor
Indoor
Installation period
More than 1 month
Less than 1 month
Nothing to do with period
When fastening and loosening the nut,
operate with double spanners because one
spanner cannot ensure firmness.
Spanner
To avoid leakage and the damage of screw thread,
aim at the center while threading the nut.
Flatten the pipe end
Flatten the pipe end or seal with an adhesive tape
13
Spanner
Connector
Nut
Measures