49
Minimum flow rate
•Check that the water pump of the space heating circuit works within the pump operating range and that the water
flow is over the pump’s minimum. If the water flow is below 12 litres/minute (6 litres/minute for AU082 unit), alarm is
displayed on the unit.
Filter
•An additional special water filter is highly recommended to be installed on the space heating (field installation),
in order to remove possible particles remaining from brazing which cannot be removed by the unit water strainer.
Water filter need to be bought and installed by installer. Number of water filter meshes is not less than 40.
Expansion tank
•The internal air pressure of the expansion vessel tank will be adapted to the water volume of the final
installation,there is not expansion tank in the ODU,it should be buy and installed by installer.The Volume of the
expansion tank is according to the whole system.
DHW Tank
•When selecting a tank for DHW operation, take into consideration the following points:
The storage capacity of the tank has to meet with the daily consumption in order to avoid stagnation of water.
Fresh water must circulate inside the DHW tank water circuit at least one time per day during the first days after
the installation has been performed. Additionally, flush the system with fresh water when there is no consumption of
DHW during long periods of time.
Heat loss
•Try to avoid long runs of water piping between the tank and the ODU installation in order to decrease possible
temperature losses.
•When necessary, put insulation on the pipes in order to avoid heat losses. The thickness of insulation is not less
than 30mm.
Piping
•
The maximum water pressure is 5 bar (nominal opening pressure of the safety valve). Provide adequate reduction
pressure device in the water circuit to ensure that the maximum pressure is NOT exceeded.
•Make sure that all field supplied components installed in the piping circuit can withstand the water pressure and
the water temperature range in which the unit can operate.
•HAIER units are conceived for exclusive use in a closed water circuit.
Minimum water volume description
The following part shows how to calculate the minimum water volume in the system for product protection (anti-
hunting) and temperature drop at defrosting.
1 Protective water volume for product
Ensure that the water volume is equal or greater than those shown below, in order to lower ON/OFF frequency of
HAIER unit at no load or extreme light load. When water volume is less than the volume indicated
(minimum water volume), compressor operation frequently stops at light load, which should result in shorter life or
failure.
Mode
AU082FYCRA(HW)
AU112FYCRA(HW)
AU162FYCRA(HW)
Minimum water volume(L)
40
55
80
Содержание AU082FYCRA(HW)
Страница 1: ...ATW Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Страница 11: ...9 405 410 600 174 174 450 950 965 395 6 Dimensions AU082FYCRA HW Unit mm ...
Страница 12: ...10 AU112 162FYCRA HW Unit mm 1490 950 380 187 405 410 600 174 174 450 170 ...
Страница 13: ...11 AU082FYCRA HW 7 Piping Diagram ...
Страница 14: ...12 AU112 162FYCRA HW ...
Страница 27: ...25 12 Water Pressure Drop ...
Страница 28: ...26 ...
Страница 57: ...55 15 PCB Photo BM2 BM1 PCB code 0151800423 ...