Gree GRS-Cm53/NaA-M - Page 18

Chapter Ⅱ Installation（4. Design of Water System）
16
No.
Name
Instruction of Function
Remarks
18
Check valve
Prevent water from back flowing
19
Water release
magnetic valve
Transfer the high-temperature hot water
in the heating water tank to the hot
water storage tank for use
Controlled by the unit; if the hot water in
the heating water tank cannot flow into
hot water storage tank through gravity,
the water release magnetic valve should
be replaced with water pump.
4.2.2 Requirements for Connection
Notes:
(1) In the water inlet pipeline system of the unit, there should install a water filter with over 30
holes to prevent blockage of double-pipe heat exchanger and damage of unit. The filter
should be washed regularly.
(2) After selecting water pipe, calculate the water power. If the resistance force of water side
pipes is greater than the delivery lift of selected water pump, reselect a larger water pump,
or replace the water pipe with a larger size.
(3) After leak detection is checked to be passed, the inlet water pipe and outlet water pipe of
the system must have heat insulation protection to prevent loss of heat and frost crack of
pipe in winter.
(4) When the ambient temperature in winter is too low or the unit will not be started for long
(24 hours), energize the unit first for not less than 8 hours before starting up the unit.
(5) When the outdoor temperature is relatively low in winter, do not cut off the power source
after the unit is closed down, otherwise the auto anti-frost operation protecting will lose its
effect.
(6) When the unit will not be used for long, please drain the water inside the unit, water tank
and pipelines through draw off valve.
(7) There should be effective earth connection devices in the water heater, hot water storage
tank, pipelines before and behind the water pump, and water supply pipe network.
(8) When selecting unit model of circulating water pump, please ensure that the circulating
water flow volume of unit should not be less than the following stipulated value:
Sheet 3 Circulating Heat Insulation Flow Volume Requirements
Unit Model
Circulating Heat Insulation Flow Volume
（
m
3
/h
）
GRS-Cm28/NaA-M
GRS-Cm28/NaA1-M
≥4.8
GRS-Cm36/NaA-M
GRS-Cm36/NaA1-M
≥6.2
GRS-Cm53/NaA-M
GRS-Cm53/NaA1-M
≥9.2
 cInstallation Sketch Map of Single Unit System: