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Midea RSJ-35 - 300RDN3 Manual

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Installation & Owner's Manual
Defrosting During Water-heating
In heat pump running period, if the evaporator frosted in lower
ambient temperature, the system will defrost automatically to
keep effective performance(about 3~10min). At defrosting time,
the fan motor will stop, but compressor will still run.
COP
COP varies at different ambient temperature. Normally lower
ambient temperature result in longer heat-up time because of
lower effective performance.
If only use E-heater, about 150 liters water will be heated, so set
higher target water temperature if ambient temperature is out of
heat pump running range.
NOTE
E-heater will be activated once for the current heating progress,
if want to apply E-heater again, please by push .
Restart After a Long Term Stop
When the unit is restarted after a long term stop(trail running
included), it is normal that outlet water is unclean. Turn the tap on
and the water will be flushed clean.
About TCO (Thermal-cutoff) and ATCO (Automatical
thermal-cutoff)
The power of E-heater will be automatically shut-off or turn on by
TCO and ATCO.
When ambient temp below 2℃, heat pump and E-heater will
take different portions of heating capacity, generally the lower
of ambient temperature, the lower portion of heat pump will
contribute as well as the higher portion of E-heater will provide
more detail please refer to Table.4-1.
If the water temperature is higher than 78℃, the ATCO will
automatically shut off the power of E-heater, and turn back on
when the temperature falls down below 68℃.
If the water temperature is higher than 85℃, the TCO will
automatically shut off the power of compressor and E-heater.
After that it needs to be reset manually.
Modes will be automatically selected by unit. Mode can not be
selected by manual operation.
Running Temperature Range
Setting water temperature target range: 38~60ºC.
E-heater running ambient temperature range: -20~43ºC.
Heat pump running ambient temperature range: -7~43ºC.
Water temperature limits:
3)
4.2 Trial- running
Checking list before trial-running.
Correct installation of the system.
Correct connection of water/air piping and wiring.
Condensate draining smoothly well insulation work for all
hydraulic part.
Correct power supply.
No air in the water pipeline and all valves opened.
Effective RCD installed.
Sufficient inlet water pressure (between 0.15MPa and 0.65MPa) .
4.2.1 Checking list before commisionning.
1)
2)
3)
4)
5)
6)
7)
8)
4.2.2 About Running
System Structure Figure
Unit has two kinds of heat sources: Heat pump(compressor)
and electric heater.
The unit will automatically select heat sources to heat water to
the target temperature.
1)
Water Temperature Display
The temperature shown on the display depends on the upper
sensor. It is normal that the display temperature has reached to
target temperature but compressor still running, because the
lower water temperature does not meet to target temperature.
2)
Tank
Temperature sensor(T5U)
Electric heater
Water inlet
Water outlet
Fig.4-3
Heat Source Shift
The default heating source is heat pump.
If ambient temperature range is out of heat pump operating
range, heat pump will stop running, the unit will shift
automatically to activate E-heater and show the icon LA( ) on
4)
display, then if the ambient temperature goes into the running
range of heat pump again, it will stop E-heater and shift
automatically to heat pump again, and the icon LA( ) will be
extinguished.
If the target setting water temperature is higher than Maximum
temperature(Heat pump), the unit will activate heat pump firstly
to the Maximum temperature, then stop heat pump, activate
E-heater to continually heat water to the target temperature.
If manually activate the E-heater running when heat pump
running, E-heater and heat pump will work together until the
water temperature gets to target temperature. So to increase
recovery rate, please manually activate E-heater.
Temperature sensor(T5L)
T4
＜
-7
60 60 60 60 60 60
60 47 55 42
-- --
-7≤T4
＜
-2
RSJ-35/300RDN3
-2≤T4
＜
2 2≤T4
＜
7
Ambient
temp.(T4)
Model
Max.Temp.
(Heat pump)
Max. Temp.
(E-heater)
Table.4-1
7≤T4
＜
43 T4≥43
… 12 …


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