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Expansion tank volume calculation
The air conditioning water system must be installed with a certain volume of expansion water tank to adapt to
the change of system water volume caused by water temperature changes (thermal expansion and contraction),
to prevent the freezing of winter water system and the instability of pump suction pressure; at the same time, as
system hydration and exhaust use.
Volume calculation of the expansion tank:
V_p=α* △ t*V_S
V_p----The effective volume of the expansion tank (the volume of water from the height difference between the
signal tube and the overflow tube), m3
α----The volume expansion coefficient of water, α=0.0006/°C
△ t----Maximum water temperature change value, °C
V_S----Water flow in the system (including the sum of water in the pipeline and equipment in the system), m3
Circulating pump selection principle
Circulating pump water flow ≥ unit rated water flow × 1.1
Closed circulating water system: circulating pump head ≥ (water system along the path resistance + water system
local resistance + unit water pressure drop) × 1.1
Open circulating water system: circulating pump head ≥ (water system hydrostatic pressure + water system local
resistance + water system resistance + unit water pressure drop) × 1.1
When multiple units are equipped with a pump, the circuit with the highest resistance is generally the farthest unit
circuit.
6.4 Electrical Connection Precautions
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The following safety rules and measures must be strictly observed before switching on the circuit:
1. When the unit is installed, it must be completed by the manufacturer's service personnel or specially trained
installers. Installation should comply with the relevant electrical, construction, environmental protection and other
laws and regulations, standards and product installation instructions issued by the state and local governments.
Users must not remove and add control components privately. Haier Company shall not be liable for any damage
to the unit and personal injury caused by failure to operate in accordance with these Rules.
2. Please refer to "Electrical Connection" for circuit connection. Each machine is equipped with a wiring diagram,
and the wiring diagram is placed inside the control box.
3. The grounding wire of the air conditioner should have a good grounding. Do not connect to gas pipes, water
pipes, telephone lines, and poor grounding can cause electric shock.
4. Check if the power supply meets the requirements before starting the machine.
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Unit power cord connection diagram
21
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