Midea RSJ-420/PZN1-H - Page 38

MCAC-HTSM-201506 Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual
38
 Water cycle pump selection:
RSJ-420/SZN1-H
Circulative heating rated water flow
7 m
3
/h
Water resistance of circulative rated water flow
160 kPa
RSJ-800/SZN1-H
Circulative heating rated water flow
14 m
3
/h
Water resistance of circulative rated water flow
160 kPa
The hot water circulative pump must use hot water pump; the temperature resistance of the
circulative water pump cannot lower than 80°C.
Rated head of circulative pump:
ΣOn-way resistance + ΣLocal resistance + Unit resistance
Rated flow of circulative pump:
Rated flow of a single circulation heating unit × Circulating unit quantity
2.8 E-heater capacity selection
 As the requirement, the auxiliary electric heater can be selected. The host unit provides the
passive control signals of the auxiliary heater.
 The installation location of the auxiliary heater must strictly comply with the installation
schematatic diagram.
 Rated heating capacity of total unit × 10%~30%.
 E-heater can apply the pipe-type or water tank E-heater. After installation, it must through
dialing codes to choose the relative E-heating mode, otherwise it will damage the unit or