Toshiba Carrier MMC-AP0181H2UL, Инженерный справочник

Страница: 26 / 213

3
Refrigerant piping design
25
3-2-2. Heat pump
System restrictions
Allowable length and height difference of refrigerant piping
*1: If “Medium Static Ducted Type (MMD-AP***BH)” is included in the system: Total indoor capacity code is between 80% and 120% of the capacity of the outdoor unit.
*2: Farthest outdoor unit from the first branch: (B), farthest indoor unit: (j).
Max. No. of combined outdoor units 2 units Note 1) The header unit is connected to main piping to indoor units.
Note 2) The header unit is the one with the highest capacity code. A (header unit) ≥ B
Note 3) To connect suction gas pipes to indoor units, use Y-shaped branching joints to
keep pipes level.
Max. capacity of combined outdoor units 19 ton
Max. No. of connected indoor units 38 units
Max. capacity of combined indoor units
H2 ≤ 49 ft (15 m) 125% (*1)
H2 > 49 ft (15 m) 105%
Item Allowable value (ft (m)) Pipes
Pipe length
Total extension of pipe (liquid pipe) Actual length 985 (300)
La + Lb + L1 + L2 + L3 + L4 + L5 + L6 + L7 + a + b + c + d +
e + f + g + h + i + j
Farthest piping length L (*1)
Equivalent length 720 (220)
Lb + L1 + L3 + L4 + L5 + L6 + j
Actual length 590 (180)
Main piping length
Equivalent length 395 (120)
L1
Actual length 330 (100)
Farthest equivalent piping length from the first
branch Li (*2)
H1 > 9.8 ft (3 m) 215 (65)
L3 + L4 + L5 + L6 + j
H1 ≤ 9.8 ft (3 m) 295 (90)
Maximum equivalent piping length of pipes connected to outdoor units 33 (10) La, Lb
Maximum actual length of pipes connected to indoor units 98 (30) a, b, c, d, e, f, g, h, i, j
Maximum equivalent length between branching sections 165 (50) L2, L3, L4, L5, L6, L7
Height difference
Height between outdoor and
indoor units H1
Upper outdoor units
H2 > 9.8 ft (3 m) 165 (50)
–
H2 ≤ 9.8 ft (3 m) 230 (70)
Lower outdoor units
H2 > 9.8 ft (3 m) 98 (30)
–
H2 ≤ 9.8 ft (3 m) 130 (40)
Height between indoor units H2 130 (40) –
Height between outdoor units H3 16 (5) –
(a)
(b)
Liquid piping
Gas piping
Figure 1 Figure 2
[Inverse connection of a gas-side branch unit]
Figure 3 Figure 4
Correct
Header unit
A Follower unit
B
Main pipe
To the indoor unit
Incorrect
Header unit
A Follower unit
B
Main pipe
To the indoor unit
Incorrect
Correct
Header unit
A Follower unit
B
Main pipe
To the indoor unit
Incorrect
Header unit
A Follower unit
B
To gas-side branch unit
Main pipe
To the indoor unit
Follower unit (B)
Height
difference
between
outdoor
units
H3
≤
16 ft
(5 m)
Height
difference
between
indoor units:
H2
≤
130 ft
(40 m)
Lb
La
O
ut
doo
r un
it
c
on
nec
ti
ng
p
ipes
Ma
in
p
ipin
g
L1
Height
difference
between
outdoor
and indoor
units:
H1
≤
230 ft
(70 m)
First branching
section
L3
L4
L5
L6
Indoor unit
f g h i
j
The longest piping length from the first branch: Li
≤
295 ft (90 m)
The longest piping length: L
≤
720 ft (220 m)
a
b
c
d
e
(j)
Indoor unit
connecting
pipe
Branching pipe L2
L7
Header unit (A)
Branching header
Y-joint