Gree VERSATI III Series - Unit Operating Principles; Diagram of the Operating Principle; Unit Operation Modes Description

Air-to-water Heat Pump Split Versati
8
SPLIT TYPE
1. Diagram of the Operating Principle
Compressor
4-way valve
Gas-liquid
separator
EXV 1
Fin-tube
heat exchanger
Fan
High pressure
switch
Discharge
temp. sensor
Suction temp.
sensor
Ambient Temp. Sensor
T-water in
PE
Safety
vavle
Expansion
vessel
T-liquid pipe
T-gas pipe
High pressure
sensor
High pressure
switch(cooling)
D
E
C
S
Outdoor Unit
Indoor Unit
B
A
Economizer
EXV 2
Defrost temp.
sensor
T-economizer out
T-economizer in
Optional
E-heater
3-way
valve
Flow
switch
Water
pump
T-water out
PE
T-optional
water sensor
High pressure
switch(cooling)
Heating
DHW
Water Tank
Mixing
Valve
Water Pump
Floor
Temp.
Tank Temp. sensor
3-Way
Valve
2-Way
Valve
Water Tank EH
Other thermal
Field Supply
Notes
(a) Water mixing accessories are optional parts. When they are required, please contact the manufacturer.
(b) The 3-way valve to be installed on site should be controlled by the user.
2. Operating Principle of the Unit
DC Inverter Air to Water Heat Pump is composed of outdoor unit, indoor unit and internal-fan coil water tank.
Operation functions:
(1) 
(2) Heating
(3) 
(4) 
(5) 
(6) 
(7) 
(8) 
(9) 
(10) 
(11) 
(12) 
(13) Floor debugging
(14) Air removal of the water system
(15) Other thermal
Cooling:
in cooling mode, the refrigerant is condensed in the outdoor unit and evaporated in the indoor unit. Via
the heat exchange with water in the indoor unit, the temperature of water decreases and it releases heat while the

user’s requirement. Through the control of valve, the low-temperature water in the system is connected with indoor
fan coil and underground pipe, and exchanges heat with the indoor air so that the indoor temperature decreases to
the required range.
Heating:
in heating mode, the refrigerant evaporates in the outdoor unit and is condensed in the indoor unit.
Via the heat exchange with water in the indoor unit, the water absorbs heat and its temperature increases while the

user’s requirement. Through the control of valve, the high-temperature water in the system is connected with indoor
fan coil and underground pipe, and exchanges heat with the indoor air so that the indoor temperature increases to