Toshiba MMY-MAP0804 Series, Quick Reference

Page: 3 / 52

System Restriction
Cautions for Installation
• Set the outdoor unit first connected to the bridging pipe to the indoor units as the header unit.
• Install the outdoor units in order of their capacity codes: A (header unit)
≥
B
≥
C
≥
D
• When connecting gas pipes to indoor units, use Y-shaped branching joints to keep pipes level.
• When piping to outdoor units using Outdoor unit connection piping kits, intersect the pipes to the outdoor unit and
those to indoor units at a right angle as shown in figure 1 on “INSTALLATION MANUAL (6. INSTALLATION OF
THE OUTDOOR UNIT)”. Do not connect them as in figure 2 on “INSTALLATION MANUAL (6. INSTALLATION OF
THE OUTDOOR UNIT)”.
Allowable Length and Allowable Height Difference of Refrigerant Piping
∗
1: Farthest outdoor unit from the first branch: (D), farthest indoor unit: (j)
∗
2: If the total capacity of outdoor units is 46HP or more, make the equivalent length 70m (real length 50m) or less.
∗
3: Make the difference 65m or less if the height difference between outdoor and indoor units (H1) is more than 3m.
∗
4: Make the difference 50m or less if the height difference between indoor units (H2) is more than 3m.
∗
5: Make the difference 30m or less if the height difference between indoor units (H2) is more than 3m.
Outdoor unit combination
Total capacity of outdoor units
Indoor unit connection
Total capacity of indoor units
(varies depending on the height difference between indoor units.)
Up to 4 units
Up to 48 HP
Up to 48 units
H2
≤
15m 135% of outdoor units’ capacity
15m < H2 105% of outdoor units’ capacity
02
Total extension
of pipe (liquid
pipe, real length)
Farthest piping length L (
∗
1)
Equivalent length
Real length
Main piping length
Equivalent length
Real length
Farthest equivalent piping length from the first branch Li (
∗
1)
Farthest equivalent piping length between outdoor units L0 (
∗
1)
Maximum equivalent piping length of pipes connected to
outdoor units
Maximum real length of pipes connected to indoor units
Maximum equivalent length between branching sections
Height between outdoor
Upper outdoor units
and indoor units H1
Lower outdoor unit
Height between indoor units H2
Height between indoor units H3
Pipe
length
Height
difference
Item
Less than 96kW Less than 34HP or less
96kW or more 34HP or more
Allowable
value
300m
500m
235m
190m
120m (
∗
2)
100m (
∗
2)
90m (
∗
3)
25m
10m
30m
50m
70m (
∗
4)
40m (
∗
5)
40m
5m
Pipes
LA + LB + La + Lb + Lc + Ld + L1 +
L2 + L3 + L4 + L5 + L6 + L7 +
a + b + c + d + e + f + g + h + i + j
LA + LB + Ld + L1 +
L3 + L4 + L5 + L6 + j
L1
L3 + L4 + L5 + L6 + j
LA + LB + Ld (LA + Lb, LA + LB + Lc)
La, Lb, Lc, Ld
a, b, c, d, e, f, g, h, i, j
L2, L3, L4, L5, L6, L7
—
—
—
—