Gree GRS-1.5/D150ANbA-K, Service Manual

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GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
60
(2) Disassembly of Four-Way Valve
Disassembly of Four-Way Valve
Procedure Description
1. Disconnect the four-way
valve by welding.
● Record direction of the four-way valve before disconnecting it as the
direction for two systems of a dual-system unit may differ.
● Remove the coil and mark the direction.
● Wrap the four-way valve with a wet cloth to protect the sliding block in
the valve against being burnt during welding and prevent water from
entering the pipe.
● Nitrogen must be charged for protection during welding. Nitrogen
pressure: 0.5±0.1 kgf/cm
2
(relative pressure)
2. Remove the four-way
valve.
● Remove the four-way valve with care to avoid touching other parts,
components, or pipes.
3. Place the four-way valve
to the original position.
● Place the four-way valve to the original position with care to avoid
touching other parts, components, or pipes.
4. Connect the four-way
valve to by welding.
● Model of the new four-way valve must be the same as the original one.
● Pipe connection must be the same as the original connection.
● Nitrogen must be charged for protection during welding. Nitrogen
pressure: 0.5±0.1 kgf/cm
2
(relative pressure)
Note: Before replacing the four-way valve, cut off power supply for the unit and recycle refrigerant
properly.
(3) Disassembly of Electronic Expansion Valve
Disassembly of Electronic Expansion Valve
Procedure Description
1. Remove the coil of the
electronic expansion valve.
● Generally, the concave on the valve meshes with the convex on the
coil. Before removing the electronic expansion valve, turn the coil
clockwise or counterclockwise for a small angle until that the convex is
between two adjacent concaves. Disconnect the convex from the
concave and then remove the coil upwards.
2. Disconnect the electronic
expansion valve by welding.
● Avoid burning other pipes during welding.
● Remove the electronic expansion valve with care to avoid touching
other parts, components, or pipes
● Nitrogen must be charged for protection during welding. Nitrogen
pressure: 0.5±0.1 kgf/cm
2
(relative pressure)
3. Connect the electronic
expansion valve by welding
● Model of the new electronic expansion valve must be the same as the
original one.
● Wrap the expansion valve with a wet cloth to protect the sliding block in
the valve against being burnt during welding and prevent water from
entering the pipe.
● Nitrogen must be charged for protection during welding. Nitrogen
pressure: 0.5±0.1 kgf/cm
2
(relative pressure)
● Install the coil after the connection pipe is welded. Ensure that the
convex on the coil meshes with the concave on the valve.
4. After replacing the
electronic expansion valve,
power off the unit and power it
on again.
● If the coil plug of the electronic expansion valve is re-connected after
being disconnected from the mainboard, the unit must be powered on
again after being powering off.
Note: Before replacing the electronic expansion valve, cut off power supply for the unit and recycle
refrigerant properly.