Cautions In Piping Installation - Carrier XCT7 Installations- Und Benutzerhandbuch

Installation instructions
If the coating on the fastening area is stripped off, the nuts rust easily.
Dimensions (bottom view) (unit of measurement: mm)
175
84
259
(5) Refrigerant pipe connection
Pipe connection method:
• 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 against the pipe being broken or bent.
• When connecting the pipe, aim at the centre to thread the nut
by hand and tighten it using double spanners.
• Do not let impurities such as sand, water, etc. into the pipe.

Cautions in piping installation:

• When welding the connector with hard solder, charge nitrogen into the pipe to prevent oxidation; or else, the pipe will
clog the capillary and the expansion valve, even causing fatal accidents.
• The refrigerant pipe should be clean. If water or other impurities enter the pipe, charge nitrogen to clean the pipe. The
nitrogen should flow under the pressure of about 0.5Mpa and when charging nitrogen, shut off one end of the pipe with
your hand to increase the pressure in the pipe, then loosen and shut off the other end.
• The piping installation should be performed after the stop valves are closed.
• Before welding the valve and the pipes, use a wet cloth to cool down the valve and pipes.
• When the connection pipe and the branch pipe need to be cut down, please use special shears and do not use a saw.
Pipe material and specs selection
1.Please select a refrigerant pipe made of the below material. Material:
phosphoric oxidized 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's thickness and specs according to the pipe selection
method (the unit is with R410A; if the pipe over 19.05 is 0-type, the pressure
preservation will be bad; thus, it must be 1/2H type and over the minimum
thickness.
3.The branch pipe must be from Carrier.
4.When installing the stop valve, refer to the relevant operation instructions.
5.The pipe installation should be within the permissible range.
6.The installation of branch pipe and gather pipe should be performed
according to the relevant manual.
A 600
C
439
D
E
175
80
F
70
7
A leg pitch1
B leg pitch2
C Front grill (air outlet side)
D Drain hole
E Bottom frame
F Knock-out hole (for piping line)
When fastening and loosening the
nut, operate using double spanners,
because a single spanner is not
sufficiently firm.
Spanner
Connector
Nut
Spanner
If threading the nut as aiming away
from the center, the screw thread will
be damaged; further, it will cause
leakage.
Drain pipe disposal
• Make sure the drain works properly.
• In snowy regions, the accumulation of
snow in the space between the heat
exchanger and external plate may
lower operating efficiency.