Fisher FSL-850B-H-3F Installation And Operation Manual page 37

When removing the outdoor unit, two ropes are needed to hang the unit along the four ways. In
order to avoid the excursion, the angle between the ropes should be less than 40 degree.
Please use M12 to tight the support fundus.
3) Refrigerant pipe connection
Note:Do not loosen the cap of the pipes when connecting the pipes between the indoor unit and the
outdoor unit. Connecting the pipes as soon as possible after loosening the cap of the pipes to avoid the
entering of water and dusk. A metal pipe should be utilized if a pipe should be installed through a wall.
◆ The connection of the pipes should confirm to the following principles:
◆ Make sure to lessen the length of connecting pipe, the height difference between the indoor and
outdoor unit, and the number of bends, and enlarge the diameter of bends.
The permitted maximum value of each case:
Height difference between the indoor and outdoor unit
◆ The pipe meld type could be employed for the connection of the pipes between the indoor and
outdoor units.
◆ The pipe joint should be tightly connected when a pipe joint is employed between two pipes. It
is better to use only one connecting pipe if the distance is not far.
◆ The pipes should not be shriveled when the pipes are connecting. The bend diameter should be
longer than 200 millimeter. The connecting pipes should not be extended or curved frequently and the
curving process should not be larger than 3 times in the same bending position.
4) Vacuum evacuating, leakage testing and refrigerant charging
◆ The system is charged with nitrogen gas from the low-pressure valve until the pipe pressure
increasing to 1Mpa, and the leakage is examined at the connecting or welding position with soap water.
Crane way schematic
90° Number of bends
Length of connecting pipes
33
＜ 30m
＜ 12
＜ 50m