26
Water pipe installation
• Circle (O) marks in the chart show the factor relevant to corrosion or water scale .
• When the water temperature is over 40 ˚C (104 ˚F), steels without protective coating may corrode when exposed
to water . Applying corrosion prevention material or degassing can be effective measure to prevent corrosion .
• For the cooling water and the make-up water, used under closed circuit water system with closed circuit cooling
tower, should satisfy the standard shown in above table .
• Supplied water or make-up water should be tap water, industrial water . Purified water, neutralized water and
softened water should not be supplied .
• 15 items in the above table is a typical factor for corrosion and/or water scale .
• When water pipe circuit freezes, it will cause breakage on the plate type heat exchanger . Therefore appropriate
preventive measure must be taken according to the situation .
- Drain remaining water in the water pipe
- Constantly operate the water pump to circulate the water within the water pipe
- Install a self-regulating heat cable on the water pipe
• Open the valve of the water pipe connected to the outdoor unit after flushing (cleaning foreign substances in
water pipe) is completed .
• Check that air is vented from the water pipe and circulation amount is secured before opening the service valve
on the refrigerant side of the outdoor unit .
• If water flow stops during outdoor unit operation, it may cause breakage on plate type heat exchanger .
NOTE
Pressure drop graphs
f
AM036CNBDCH
f
AM048CNBDCH
Pr
essur
e dr
op fr
om hea
t
ex
changer (psi)
2.5
2.0
1.5
1.0
0.5
0.0
3.2
4.8
6.3
7.9
9.5
Water flow rate (GPM)
Pr
essur
e dr
op fr
om hea
t
ex
changer (psi)
4.4
3.6
2.9
2.2
1.5
0.7
0.0
5.3
7.1
9.0
10.8
12.7
Water flow rate (GPM)
f
AM096CNBDCH
f
AM144CNBDCH
Pr
essur
e dr
op fr
om hea
t
ex
changer (psi)
7.3
6.5
0.0
0.7
1.5
2.2
2.9
3.6
4.4
5.1
5.8
26.4
21.1
15.9
10.6
5.3
Water flow rate (GPM)
Pr
essur
e dr
op fr
om hea
t
ex
changer (psi)
6.6
19.8
33.0
46.2
0.0
1.5
2.9
4.4
5.8
7.3
8.7
10.2
11.6
13.1
Water flow rate (GPM)
DB68-12327A-00_IM_DVM Hydro HT_AA_EN_.indd 26
DB68-12327A-00_IM_DVM Hydro HT_AA_EN_.indd 26
2023-06-15 오전 10:37:25
2023-06-15 오전 10:37:25
