Installer reference guide / Mono tank integrated type 71
CAUTION
• Water pipe and connections shall be cleaned by using water or cleaner before operating the unit at first
time.
• Considering E.S.P and water pump performance, select water plumbing specification and under floor
loofs.
• Make sure to calculate the total resistance of piping system and determine the size of pipes before
selecting the required head of pumps. If the pressure loss of total water system is over than designed
pressure, an external water pump shall be installed on piping system in series.
• Do not connect power supply while water is charging.
• When initial installation or re-installation is required, remove air by air vent valve in water plumbings
which are installed by local installers to prevent air trap in the system while charging water.
• Make sure that back flow preventer (check valves) shall be installed on main supply line to prevent from
contaminating the city water.
– It is recommended to install the make-up water assembly to prevent from contaminating the city water.
– Check valves in the make-up water assembly can prevent running water inside Outdoor Unit from
contaminating water supplies during installation or maintenance works.
To choose a water pump
The illustration below shows the external static pressure of the unit depending on the water flow and the pump setting.
When ESP is not enough, additional pump should be installed. In this case, install the PWM control external type pump
(Heating type) additionally.
0
10
20
30
40
50
60
70
80
90
100
10 15 20 25 30 35 40 45 50
Flow [l/min]
ESP [kPa]
0
10
20
30
40
50
60
70
80
90
100
10 15 20 25 30 35 40 45 50
Flow [l/min]
ESP [kPa]
The values shown in the dotted graph reflect pressure
drops in the mono outdoor unit heat exchanger.
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