Piping Work - Haier MRV II Instruction Manual

sending,
it must connect with air sending and air return duct ,it is forbidden to blow
air into working room directly, otherwise the noise level will be so high
due to the high fan speed from the air outlet .
4.3.5.3 Connection between indoor unit and duct should be soft, and
connect a static pressure box out of unit to avoid shaking and noise pass
through the duct.
4.3.5.4 The design for air sending/return duct, static pressure box, and air
sending/return outlet should be done by the design organization with
relative competency to ensure indoor unit air sending character matches
the duct .

5 Piping work

Refrigerant pipe is made of phosphorus deoxidized copper seamless
steel pipe , weld them together with copper or phosphorus welding rod.
When carrying out this work please comply with the followings strictly :
dry ,clean, hermetic. Therefore, note the below items during working:
5.1 After cutting off the pipe refer to dimensions, blow it with nitrogen for
cleanness. For the pipe which diameter is over 25mm, the pipe inside
need to be cleaned with duster cloth for dust and copper scraps.
5.2 Cover the both ends of the pipe to prevent the dust , vapor and
impurity into the pipe.
5.3 Do not execute the piping work in the rain, moist air and water may
- 12 -
Part 1