Toshiba MMY-MAP0806FT8P-E Installation Manual page 14

Allowable length and allowable height difference of refrigerant piping (*6)
Item
Less than 34 HP or less
Total extension of
pipe (liquid pipe,
34 HP or more
real length)
Farthest piping length L (*1) (*2)
Max. equivalent length of Main
piping
Pipe length
Farthest equivalent piping length from the rst
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 Selector unit and indoor unit
Maximum equivalent length between branching section
Height between outdoor and
indoor units H1
Height between indoor units H2
Height
difference
Height between outdoor units H3 (*4)
Height difference between
indoor units in one Flow Selector
unit
*1: Farthest outdoor unit from the rst branch: (C), farthest indoor unit: (o)
*2: Allowable values for length equivalent to furthest pipe are shown below and they vary according to performance rank of
outdoor unit.
22.4 to 56.0: 185 m, 61.5 to 112.0: 195 m, 120.0: 200 m
*3: 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.
*4: 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).
*5: 40 m is possible for a system that uses only the ow selector unit (multi port type), whose all the indoor units are 3 HP or higher,
and working ambient temperature is 0 °C or higher.
*6: As for 44 HP to 54 HP, contact our agent.
*7: If the height difference (H2) between indoor units exceed 3 m, set 50 m or less.
*8: Total charging refrigerant is 140 kg or less.
*9: The total piping length in one Multi port type FS unit in case of branching to 4 : 120 m (p + q + r + L11 + s + t), In case of
branching to 6 : 180 m.
*10: Length of whole pipe should be shorter than 50 m (L11+s+t, L13+u+v) in one branch.
25-EN
Allowable
value
300 m LA + La + Lb + Lc + L1 + L2 + L3 +
L4 + L5 + L6 + L7 + L8 + L9 + L10 +
L11 + L12 + L13 + L14 + a + b + c +
1000 m
d + e + f + g + h + i + j + k + l + m +
(*8)
n + o+ p + q + r + s + t + u + v
LA+Lc+L1+L3+L4+L5+L6+L7+L8+o
Equivalent length 200 m
(LA+Lc+L1+L3+L9+L10+L11+t)
Real length 180 m
(LA+Lc+L1+L3+L9+L12+L13+v)
Equivalent length 100 m
H2 > 3 m
Real length 85 m
L1
Equivalent length 120 m
H2 3 m
Real length 100 m
L3+L4+L5+L6+L7+L8+o
H1 > 3 m 50 m
(L3+L9+L10+L11+t)
H1 [ 3 m 65 m
(L3+L9+L12+L13+v)
15 m LA+Lc (LA+Lb)
10 m Lc (La, Lb)
a+f, b+g, c+h, d+i, e+j, k, l,
30 m
L6+L7+L8+o(Ln)
Single port type 15 m f, g, h, i, j, L7+m, L7+L8+o
Multi port type
50 m
Single port type p, q, r, L11+s, L11+t, L13+u, L13+v
(*9) (*10)
(Long piping model)
50 m L2, L3, L4, L5, L9, L10, L12
70 m
Upper outdoor units
(*7)(*11)(*12)
Lower outdoor units 30 m (*5)
Upper outdoor units 40 m
Lower outdoor units (*3) 15 m
5 m
Single port type H4 0.5 m
Single port type
(Long piping model) H6
3 m
Multi port type H5
– 13 –
*11: Extension up till 90 m is possible with conditions below
- Outdoor Temperature
Pipes
- Equivalent length of farthest piping from rst branching Li < 50 m
- Actual length of main piping L1 < 100 m
- Height difference between indoor units H2 < 3 m
- Single CDU, and up to 18 HP
- Minimum capacity of connectable indoor : unit 036 type or Larger
- Height difference between FS units < 0.5 m
- The total value of capacity codes of the connectable indoor units to the capacity code of the outdoor unit : 90% to 100%
*12: In case of down sizing main liquid pipe (Extent 2), the height difference between outdoor and indoor units (H1) is 30 m or less.
(See
"Selection of pipe size".
Airtightness test
After the refrigerant piping has been nished, execute an airtight test.
For an airtight test, connect a nitrogen gas canister as shown in the gure 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, ammable gases, or noxious gases in an airtight test.
To gauge
manifold
Liquid-side
To
service port
outdoor
Liquid-side
unit
valve
Piping at site
Service port of suction gas side
Ball valve of suction gas side
Cooling : 10 °C to 46 °C (Dry-bulb temp.)
Heating : -5 °C to 15 °C (Wet-bulb temp.)
Simultaneous operating : 7 °C to 25 °C (Dry-bulb temp.)
)
Connected to
indoor unit
Packed valve details
To outdoor
unit
To outdoor unit
Service
To
port
Service port
gauge
of discharge of balance
gas side manifold
pipe side
Ball valve of
To
discharge
outdoor
gas side
Piping unit
at site
Packed
valve
of balance
Piping
pipe side
at site Piping
Connected to
at site
other follower units
Low pressure High pressure
gauge gauge
Suction gas side valve
fully closed
Gauge
V V
L H
Main
manifold
Header outdoor unit
piping
Brazed
Reducing
Service port
valve
Ø6.4 copper pipe
Fully closed
Service port
Ø6.4
Discharge gas side valve copper
fully closed
pipe
Fully
closed
Nitrogen
Service port
gas
Liquid side valve fully closed
Fully
closed
Service port
Balanced pipe side valve
fully closed
26-EN