9
MZ series
4.2 Installation of the Connection Pipe
Connecting piping for indoor unit and outdoor unit are in manifold mode. (As shown below).
Fig 6
4.2.1 Piping between the Indoor and Outdoor Units
(1) If the liquid and gas stop valves which have the sign of A , B, C, D or E have not been connected to the
indoor units, please turn off the screw cap with the spanner airproof.
(2) Refer to Fig.7 for the moments of torque for tightening screws.
(3) Let the flare end of the copper pipe point at the screw and then tighten the screw by hand.
(4) After that, tighten the screw by the torque wrench unit it clatters (as shown in Fig.7).
(5) The bending degree of the pipe can not be too small; otherwise it will crack. And please use a pipe tube
bender to bend the pipe.
(6) Wrap the exposed refrigerant pipe and the joints by sponge and then tighten them with the plastic tape.
P ipe
F lare N ut
S panner
Fi
g
7
1) During the connection of the indoor unit and the refrigerant pipe, never pull any joints of the indoor unit by force;
otherwise the capillary pipe or other pipe may crack, which then would result in leakage.
2) The refrigerant pipe should be supported by brackets, that is, don
’
t let the unit withstand the weight of it.
3) If the piping connection size of outdoor unit does not match the piping connection size of indoor unit, use the
piping connection dimension of indoor unit. And use different-diameter joints which is installing on the place of
the piping connection to connect the indoor unit.
4) For the MZ system, each pipe should be labeled to tell which system it belongs to avoid mistaken
inaccurate piping.
4.2.2 Allowable pipe length and drop height among indoor and outdoor units
If the total refrigerant pipe length (liquid pipe) is smaller than that listed in the table below, no additional
refrigerant will be charged.
Table 6
Model
FGH-42ES-MZ
Total Liquid Pipe
Lenght (a+b+c+d+e)
131.2ft
Pipe
diameter
Thickness of
copper tube
Tightening
torque
1/4 inch
≥0.
0315 inch 11
～
22 ft·lbf
3/8 inch
≥0.
0315 inch 26
～
29 ft·lbf
1/2 inch
≥0.
0315 inch 33
～
37 ft·lbf
5/8 inch
≥
0.0394 inch 44
～
48 ft·lbf
