MCAC-RTSM-2013-12 Midea High-temperature Direct-heating Heat Pump Water Heater Technical Manual
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6. Operation Instruction
1. This type of heat pump is designed to connect with a pressure-bearing tank. While installing, please
refer to the recommended connection diagram in the owner’s manual. If it is needed to be connected
with an open tank, the water level controlling and the water cycling heating controlling should be realized
in projecting. It is relatively a bit complex. In this condition, we suggest to adopt the C series of the
commercial direct-heating type.
2. Water heating: The water output temperature range is 40℃~60℃ (default 56℃). When the water
temperature(T5) in the tank is 2℃ (or even more) lower than the stopped temperature of the heat pump(T
stop), the unit will star working automatically until the water temperature(T5) reaches up to (or even higher
than) the stopped temperature(T stop). The temperature of hot water outlet can achieve the setting
temperature only by an once-through circulation.
3. Hot water supply: There is no need to use an additional hot water pump to boost the hot water to the end
users since the storage tank is a pressurized type. If the pressure of the tap water is not stable, an
one-way valve is suggested to be located near the cold water inlet of the tank.
4. Pipe network return (not essentially for the hot water supplying system): When the return temperature
controller detects that the water temperature in the pipe is lower than the lower limit of the return temperature
(set at 40 ℃ ~ 45 ℃), the return controlling solenoid valve will open. Then, the hot water returning pump will
open. The hot water will enter the pipeline and the cold water will return back to the water tank. When the
temperature controller detects that the water temperature is higher than the upper limit of the return water
temperature (set at 45 ℃ ~ 50 ℃), the return solenoid valve and the hot water supplying pump will close by
order. Then, the pipe network returning will stop. (This manner can only be realized in the project and the
main unit of the heat pump cannot control it. This is only one of the pipe network return manner and other
manners can be selected according to different projects.)
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