MXZ-SM42NAMHZ Installation Manual

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4.2.2. Connection with Branch Box (Fig. 4-2)
• Thisunithasaredconnectionsoneachindoorunitandbranchboxandoutdoorunitsides.
• Remove the valve cover of the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the branch box and outdoor unit.
Permissible
length
(one-way)
Total piping length c1+b1+b2+a1+a2+a3+a4+a5+a6+a7+a8≤150m(492ft.)
Farthest piping length (L) *
1
c1+b2+a8≤80m(262ft.)
Piping length between outdoor unit and branch boxes c1+b1+b2≤55m(180ft.)
Farthestbranchboxfromtherstjoint(b2) b2≤30m(98ft.)
Farthest piping length after branch box (R) a8≤25m(82ft.)
Total piping length between branch boxes and indoor units a1+a2+a3+a4+a5+a6+a7+a8≤95m(311ft.)
Permissible
height difference
(one-way)
In indoor/outdoor section (H) *
2
H≤50m(164ft.)(Incaseofoutdoorunitissethigherthanindoorunit)
H≤40m(131ft.)(Incaseofoutdoorunitissetlowerthanindoorunit)
In branch box/indoor unit section (h1) h1+h2≤15m(49ft.)
In each branch unit (h2) h2≤15m(49ft.)
In each indoor unit (h3) h3≤12m(39ft.)
Number of bends
| c1 + b1 + a1 |, | c1 + b1 + a2 |, | c1 + b1 + a3 |, | c1 + b1 + a4 |, | c1 + b1 + a5 |, | c1 + b2 +
a6 |, |
c1 + b2 + a7 |, | c1 + b2+a8|≤15
*1 Thepipingspecicationtabledoesnotprovideaminimumlinesetlength.However,indoorunitswithconnectedpipinglengthlessthan16ft.(5m)couldproduceintermit-
tent noise during normal system operation in very quiet environments. Please be aware of this important information when installing and locating the indoor unit within the
conditioned space.
*2 Branch box should be placed within the level between the outdoor unit and indoor units.
B
D
B
C C C
C
C C
C
L
R
h2
b2
b1
c1
a6a5
a4a3a2
h3
h1
H
a1
a7 a8
Fig. 4-2
A Outdoor unit
B Branch box
C Indoor unit
D Therstjoint
4. Installing the refrigerant piping
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