134
Total rated capacity of downsteam
indoor units: Q(Btu/h)
Size of connection pipe between branches of mode exchanger
Low pressure gas pipe
mm(inch)
Liquid pipe
mm(inch)
High pressure gas pipe
mm(inch)
Q
≤
17100
Φ
12.7(1/2)
Φ
6.35(1/4)
Φ
12.7(1/2)
17100<Q
≤
48500
Φ
15.9(5/8)
Φ
9.52(3/8)
Φ
12.7(1/2)
48500<Q
≤
72000
Φ
19.05(3/4)
Φ
9.52(3/8)
Φ
15.9(5/8)
72000<Q
≤
96000
Φ
22.2(7/8)
Φ
9.52(3/8)
Φ
19.05(3/4)
96000<Q
≤
120000
Φ
28.6(1-1/8)
Φ
12.7(1/2)
Φ
22.2(7/8)
120000<Q
≤
144000
Φ
28.6(1-1/8)
Φ
12.7(1/2)
Φ
22.2(7/8)
144000<Q
≤
168000
Φ
28.6(1-1/8)
Φ
15.9(5/8)
Φ
22.2(7/8)
168000<Q
≤
216000
Φ
28.6(1-1/8)
Φ
15.9(5/8)
Φ
28.6(1-1/8)
216000<Q
≤
240000
Φ
34.9(1-3/8)
Φ
15.9(5/8)
Φ
28.6(1-1/8)
240000<Q
≤
312000
Φ
34.9(1-3/8)
Φ
19.05(3/4)
Φ
28.6(1-1/8)
312000<Q
≤
336000
Φ
34.9(1-3/8)
Φ
19.05(3/4)
Φ
28.6(1-1/8)
336000<C
Φ
41.3(1-5/8)
Φ
19.05(3/4)
Φ
34.9(1-3/8)
10.4.8 Piping size among downstream branches of mode exchanger ”a
、
h”
Rated capacity of indoor unit C(Btu/h)
Piping size among downstream branches of mode exchanger
Gas Pipe mm(in.)
Liquid Pipe mm(in.)
C≤9500
Φ
9.52(3/8)
Φ
6.35(1/4)
9500<C≤17100
Φ
12.7(1/2)
Φ
6.35(1/4)
17100<C≤48500
Φ
15.9(5/8)
Φ
9.52(3/8)
10.4.9 Branch selection of downstream indoor unit of mode exchanger (”B1,B2,B3”)
R410A refrigerant system
Total rated capacity of downsteam indoor
units: X(Btu/h)
Model
Y-type branch
X
≤
48500
FQ01A/A
10.4.10 Piping size between mode exchanger and downstream indoor unit (” b
、
c
、
d
、
g”)
Rated capacity of indoor unit C(Btu/h)
Pipe between mode exchanger and IDU
Gas Pipe mm(inch)
Liquid Pipe mm(inch)
C≤9500
Φ
9.52(3/8)
Φ
6.35(1/4)
9500<C≤17100
Φ
12.7(1/2)
Φ
6.35(1/4)
17100<C≤48500
Φ
15.9(5/8)
Φ
9.52(3/8)
10.4.11 Piping between indoor branch and indoor unit (“e/f/i/j/k”)
Size of connection pipe between indoor branch and indoor unit should be consistent with the connection
pipe of indoor unit.
Piping between indoor branch and indoor unit “e/f/i/j/k”
Rated capacity of indoor units:
X ((Btu/h)
Size of connection pipe between indoor branch and indoor unit
Gas pipe mm(in.)
Liquid pipe mm(in.)
C≤9500
Φ
9.52(3/8)
Φ
6.35(1/4)
9500<C≤17100
Φ
12.7(1/2)
Φ
6.35(1/4)
17100<C≤48500
Φ
15.9(5/8)
Φ
9.52(3/8)
10.5 Connection method when capacity of indoor unit exceeds 48500Btu/h
When connecting to the indoor unit with capacity of over 48500Btu/h, it is not allowed to connect with
only one branch; it must use two branches controlled by the same mainboard for parallel connection.
