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Heat Pump Water Heater
9. Capacity Coefficient Factor
9.2 Maximum Duct Length
Allowable duct length
L1
Case 1
System Static
Pressure
1150 rpm P(Pa)
Remark
3.6 CMM
55
4.5 CMM
43
NOTE
• Total of static pressure must not exceed 55 Pa.
Static pressure calculation table
Smooth
Component
PVC Duct
(Pa/m)
Ø160
Ø200
0.8
Adaptor
PVC Duct
13
- 60 Hz ( R134a)
L2
L1
Case 2
Case
Case 1
Size
Ø 200 Ø 160 Ø 200 Ø 160 Ø 200 Ø 160 Ø 200 Ø 160 Ø 200 Ø 160
Outlet only
L1+L2
62
25
(m)
31
12
3.6 CMM
Smooth 90˚ Duct adapter
PVC Bend
(Pa/EA)
2
6
2.3
L2
L1
Case 3
Case 4
Case 2
Case 3
No Elbow
Elbow x 1
55
22
52
27
10
24
Smooth
(Suc. &
PVC Duct
Dis. set)
(Pa/m)
(Pa)
-
5.5 + 5.5
L2
L2
L1
Case 5
Case 4
Elbow x 1
19
52
19
7
24
7
4.5 CMM
Smooth 90˚ Duct adapter
PVC Bend
(Pa/EA)
3.1
9.4
1.2
3.7
PVC 90˚ Bend
L1
Case 5
Elbow x 2
49
16
21
4
(Suc. &
Dis. set)
(Pa)
-
5.8 + 5.8
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