Refrigerant Pipe Engineering - Carrier X-POWER Series Service Manual

R410a DC Inverter 60Hz

3. Refrigerant Pipe Engineering

3.1 Refrigerant Pipe Processing
3.1.1Basic requirements
3.1.1.1 Operation procedure
Determine the route and size of the pipeline according to the construction drawing  Make and installing
bracket, hanger and support  Make and arrange pipe accessories  Recharge nitrogen gas for protection
 Brazing welding  Pipe flushing  air tightness test  Thermal insulation  Vacuum drying
3.1.1.2 Three principles for refrigerant piping
Caution: Removing oil for copper pipe of a system that uses R410A
For the system that uses R410A, oil-free copper pipes should be selected (they can also be customized).
If ordinary (oily) copper pipes are used, it must be cleaned with gauze that is dipped into
tetrachloroethylene solution.
Purpose of cleansing copper pipe: Remove the lube (industrial oil used during the processing of the
copper pipe) attached to the inner wall of the copper pipe. The ingredients of such lube are different from
those of the lube used by the R410A refrigerant, and they will produce deposit through reaction, which
may cause complicated system fault.
Special Note: Never use CCl4 for pipe cleansing and flushing, or the system will be seriously damaged.
3.1.1.3 Support for refrigerant pipe
1. Fixing horizontal pipe
When the air conditioner is running, the refrigerant pipe will deform (for example, shrunk/expanded or
inclined downward). To avoid pipe damage, use hanger or support to support it (see the table below for
the criteria).
Pipe Diameter Less than Ф25/32in.(20mm)
Interval between
support points
In general, gas pipe and liquid pipe should be suspended in parallel, and the interval between support
points should be selected according to the diameter of the air pipe. Since the temperature of the flowing
refrigerant will change as the operation and working condition change, which will result in hot expansion
and cold shrinkage of the refrigerant pipe, so the pipe with thermal insulation should not be clamped
tightly, otherwise the copper pipe may get broken due to stress concentration.
2. Fixing vertical pipe
Fix the pipe along the wall according to the pipeline route. Round log should be used at the pipe clip to
120
Ф25/32~1-37/64in.(Ф20~40)
3.28ft(1m)
Larger thanФ1-37/64in.(Ф40mm)
4.92ft(1. 5m)
Carrier service manual
6.56ft(2. 0m)
Installation