Toshiba MMY-MAP0806FT8P-E Installation Manual page 69

¿ Allowable length and allowable height difference of refrigerant piping
Item
Less than 34 HP or less
Total extension of
pipe (liquid pipe,
34 HP or more
real length)
Farthest piping length L (*1) (*3)
Max. equivalent length of Main
piping (*12)
Pipe length
Farthest equivalent piping length from the first
branch Li (*1)
Farthest equivalent piping length between outdoor units LO (*1)
maximum equivalent piping length of pipes connected to outdoor
units
Maximum real length of terminal branching section to indoor
units
Maximum real length of between Flow Selec-
tor unit and indoor unit
Maximum equivalent length between branching section
Height between outdoor and
indoor units H1 (*7)
Height
Height between indoor units
difference
H2 (*7)
Height between outdoor units H3 (*5)
<In case of connecting single port type Flow Selector unit and a branch of Multi port type Flow Selector unit to the indoor
units.>
Maximum equivalent length indoor units in group control by one single port Flow
Selector unit Ln
Maximum real length between Flow Selector unit
and indoor unit (*2)
Height difference between indoor units in group control by one Flow Selector
unit H4
*1: Farthest outdoor unit from the first branch: (C), farthest indoor unit: (o)
*2: Run wires to one indoor unit and flow selector unit linked with one of those remote controllers if flow selector unit is connected to
multiple indoor units.
*3: Allowable values for length equivalent to furthest pipe are shown below and they vary according to performance rank of outdoor
unit.
22.4 to 40.0: 185 m, 45.0 to 78.5: 195 m, 85.0 to 118.0: 200 m, over 123: 130 m
*4: When system capacity is greater than 28 HP, height difference between indoor units is limited to 3 m. If the piping exceeds 3 m
with a capacity greater than 28 HP there may be a case of capacity shortage in cooling.
*5: Ensure that the header unit is installed below all connected follower outdoor unit(s).
Possible product failure may occur if header unit is installed above any follower unit(s).
*6: 40m is possible for a system that uses only the flow selector unit (multi port type), whose all the indoor units are 3HP or higher,
and working ambient temperature is 0ºC or higher.
*7: As for 44HP to 54HP, contact our agent.
*8: If the height difference (H2) between indoor units exceed 3 m, set 50 m or less.
*9: Total charging refrigerant is 140 kg or less.
*10: The total piping length in one FS unit in case of branching to 4 : 120m (p + q + r + s + t + u), In case of branching to 6 : 180m.
*11: Length of whole pipe should be shorter than 50 m in one branch.
*12: As for 42HP to 54HP, contact our agent.
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Allowable
Pipes
value
300 m LA + La + Lb + Lc + L1 + L2 + L3 +
L4 + L5 + L6 + L7 + L8 +L9 + a + b
1000 m
+ c + d + e + f + g + h + i + j + k + l
(*9)
+ m + n + o+ p + q + r + s + t + u
Equivalent length 200 m (*2)
LA+Lc+L1+L3+L4+L5+L6+L7+L8+o
Real length 180 m
Equivalent length 100 m
H2 > 3 m
Real length 85 m
L1
Equivalent length 120 m
H2 ≤ 3 m
Real length 100 m
H2 > 3 m 50 m
L3+L4+L5+L6+L7+L8+o,
L3+L9+s+u
H2 [ 3 m 65 m
15 m LA+Lc (LA+Lb)
10 m Lc (La, Lb)
30 m a+f, b+g, c+h, d+i, e+j, k, l
Single port type 15 m f, g, h, i, j
50 m
Multi port type p, q, r, s+t, s+u
(*10) (*11)
50 m L2, L3, L4, L8, L9
Upper outdoor units 70 m (*8) ‒
Lower outdoor units 30 m (*6) ‒
Upper outdoor units 40 m ‒
Lower outdoor units (*4) 15 m ‒
5 m ‒
30 m L6+L7+L8+o
(Ex.) In case of wiring to the indoor
unit (m): L7+m ≤ 15m
Single port type 15 m
In case of wiring to the indoor
unit (n): L7+L8+n ≤ 15m
Multi port type 50 m s+t, s+u ≤ 50m
0.5 m ‒
Airtightness test
After the refrigerant piping has been finished, execute an airtight test.
For an airtight test, connect a nitrogen gas canister as shown in the figure on this page and apply pressure.
• Be sure to apply pressure from the service ports of the packed valves (or ball valves) at the suction gas side,
discharge gas side, liquid side and balance pipe side.
• An airtight test can only be performed at the service ports at the suction gas side, discharge gas side, liquid side
and balance pipe side.
• Close the valves fully at the suction gas side, discharge gas side, liquid side and balance pipe side. As there is
a possibility that the nitrogen gas will enter into the cycle of outdoor units, re-tighten the valve rods at the liquid
side and balance pipe side before applying pressure.
• For each refrigerant line, apply pressure gradually in steps at the suction gas side, discharge gas side, liquid
side and balance pipe side.
Be sure to apply pressure at the suction gas side, discharge gas side, liquid side and balance pipe side.
WARNING
Never use oxygen, flammable gases, or noxious gases in an airtight test.
To gauge Packed valve details
manifold To outdoor
unit
Liquid-side
To
service port
outdoor
To outdoor unit
Liquid-side
unit
valve
To
Service port
gauge
of discharge
gas side manifold
Ball valve of
Piping at site
discharge
gas side
Piping
at site
Service port of suction gas side
Piping
at site
Piping
Ball valve of suction gas side
at site
– 68 –
Low pressure
gauge
Connected to
Suction gas side valve
indoor unit
fully closed
V
Main L
Header outdoor unit
piping
Brazed
Service port
Ø6.4 copper pipe
Fully
closed
Service
Service port
Ø6.4
port
Discharge gas side valve
copper
of balance
fully closed
pipe side pipe
Fully
closed
To
outdoor Service port
unit
Liquid side valve fully closed
Packed Fully
valve
closed
of balance
Service port
pipe side
Connected to
Balanced pipe side valve
other follower units
fully closed
High pressure
gauge
Gauge
V
H
manifold
Reducing
valve
Nitrogen
gas
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