Gree VERSATI III Series Operating instructions

Test Operation & Troubleshooting & Maintenance
TEST OPERATION &
TROUBLESHOOTING & MAINTENANCE
VERSATI ⅢAir To Water Heat Pump

Test Operation & Troubleshooting & Maintenance
Page 1
1 Trial Run
1.1 Check for Wiring
WARNING!
Do not check for the power supply unless proper checkout equipment has prepared and preventive
measures have been taken, otherwise it would lead to severe injury.
Are sizes of connection lines and the air switch proper?
Does wiring comply with relative standards and electric codes?
Is there any incorrect wiring?
Does each contact work properly?
Is the power supply and insulation proper?
Are initial set points of control and protective elements satisfied?
1.2 Check for the Water System
Are water inlet and outlet directions correct?
Is the water piping cleaned? Are there foreign matters at the pipe joints? Is the water quality
satisfied?
Is insulation of water pipes in good condition?
Does exhaust valve of the water system work properly?
1.3 Check for the Communication System
When the unit is powered on, check for the communication system, including: communication
between AP1 and AP2, between the wired controller and the main board. When there is unusual
communication, this error will be displayed at the wired controller. Then, check out the cause according
to the displayed error. See the figure below for wiring of the communication system.
1.4 Trial Run
Start the unit when there is no any problem for wiring and piping. After startup, check for the
electrostatic expansion valve, water pump, fan, and compressor to see if they work normally. When
there is any error, solve it according to the troubleshooting flowchart covered in this manual. However, if
the troubleshooting flowchart is still unhelpful, please contact GREE sales agent.
2 Error Code List
No.
Full Name
Displayed Name
Error Code
1
Ambient temperature sensor error
Ambient sensor
F4
2
Defrost temperature sensor error
Defro. sensor
d6
3
Discharge temperature sensor error
Disch. sensor
F7
4
Suction temperature sensor error
Suction sensor
F5
5
Outdoor fan error
Outdoor fan
EF
6
Compressor internal overload protection
Comp. overload
H3
7
High pressure protection
High pressure
E1

Test Operation & Troubleshooting & Maintenance
Page 2
No.
Full Name
Displayed Name
Error Code
8
Low pressure protection
Low pressure
E3
9
High discharge protection
Hi-discharge
E4
10
Refrigerant loss protection
Refri-loss
P2
11
Heat pump-water pump protection
HP-pump
E0
12
Solar kit-water pump protection
SL-pump
EL
13
Incorrect capacity DIP switch setting
Capacity DIP
c5
14
Communication error between indoor and outdoor unit
ODU-IDU Com.
E6
15
Drive communication error
Drive com.
16
High pressure sensor error
HI-pre. sens.
Fc
17
Enthalpy-enhancing sensor error
En. senser
F8
18
Low pressure sensor error
LOW-pre. Sens.
dL
19
Heat exchanger-leaving water temperature sensor error
Temp-HELW
F9
20
Auxiliary heater-leaving water temperature sensor error
Temp-AHLW
dH
21
Heat exchanger-entering water temperature sensor error
Temp-HEEW
22
Water tank water temperature sensor 1 error
Tank sens. 1
FE
23
Water tank water temperature sensor 2 error
Tank sens. 2
24
Solar kit-entering water temp sensor
T-SL water out
25
Solar kit-leaving water temp sensor
T-SL water in
FH
26
Solar kit- temp sensor
T-Solar pannel
FF
27
Remote room sensor 1
T-Remote Air1
F3
28
Remote room sensor 2
T-Remote Air2
29
Heat pump-water flow switch
HP-Water SW
Ec
30
Solar kit-water flow switch
SL-Water SW
F2
31
Welding protection of the auxiliary heater 1
Auxi. heater 1
EH
32
Welding protection of the auxiliary heater 2
Auxi. heater 2
EH
33
Welding protection of the water tank heater
Auxi. -WTH
EH
34
Under-voltage DC bus or voltage drop error
DC under-vol.
PL
35
Over-voltage DC bus
DC over-vol.
PH
36
AC current protection (input side)
AC curr. pro.
PA
37
IPM defective
IPM defective
H5
38
PFC defective
FPC defective
Hc
39
Start failure
Start failure
Lc
40
Phase loss
Phase loss
LD
41
Drive module resetting
Driver reset
P6
42
Compressor over-current
Com. over-cur.
P0
43
Overspeed
Overspeed
P5
44
Sensing circuit error or current sensor error
Current sen.
LF
45
Desynchronizing
Desynchronize
Pc
46
Compressor stalling
Comp. stalling
H7
47
Communication error
drive-main com.
LE

Test Operation & Troubleshooting & Maintenance
Page 3
No.
Full Name
Displayed Name
Error Code
48
Radiator or IPM or PFC module overtemperature
Overtemp.-mod.
P8
49
Radiator or IPM or PFC module temperature sensor error
T-mod. sensor
P7
50
Charging circuit error
Charge circuit
Pu
51
Incorrect AC voltage input
AC voltage
PP
52
Drive board temperature sensor error
Temp-driver
PF
53
AC contactor protection or input zero crossing error
AC contactor
P9
54
Temperature drift protection
Temp. drift
PE
55
Current sensor connection protection (current sensor not
connected to phase U/V)
Sensor con.
PD
56
Communication error to the outdoor unit
ODU Com.
E6
57
Communication error to the indoor unit
IDU Com.
E6
58
Communication error to the drive
Driver Com.
E6
59
Solar kit-superheating
Solarsuperheat
F6

Test Operation & Troubleshooting & Maintenance
Page 4
3 Flow Chart of Troubleshooting
3.1 Comp High-pressure Protection E1

Test Operation & Troubleshooting & Maintenance
Page 5
3.2 Comp Low- pressure Protection E3
3.3 Comp Discharge Temp Protection E4

Test Operation & Troubleshooting & Maintenance
Page 6
3.4 Overload Protection of Compressor or Driver Error
3.5 DC Fan Error EF

Test Operation & Troubleshooting & Maintenance
Page 7
3.6 Temperature Sensor Error
3.7 Communication Malfunction E6

Test Operation & Troubleshooting & Maintenance
Page 8
3.8 Capacity Switch Error (Code:"C5")
4 Diagnosis of Driving
4.1 Diagnosis Flowchart of Driving of Single-phase Unit and Three-phase
Unit
Drive Module Reset(Code:"P0") ; IPM or PFC Temperature Sensor Error(Code:"P7") ; AC
Current Protection (Input Side)(Code:"PA"); Current Sense Circuit Error(code:"PC"); PFC
Protection(Code:"HC")

Test Operation & Troubleshooting & Maintenance
Page 9
IPM or PFC Over-temperature Protection(Code:"P8")
DC Busbar Over-voltage Protection(Code:"PH") ; DC Busbar Under-voltage Protection
(Code:"PL")
Note: three-phase input voltage is in the range from 320VAC to 475VAC.

Test Operation & Troubleshooting & Maintenance
Page 10
Drive-to-main-control Communication Error(Code:"P6")
Compressor Startup Failure(code:"LC")

Test Operation & Troubleshooting & Maintenance
Page 11
Compressor Current Protection (Code:"P5"); Compressor Motor Desynchronizing (Code:"H7");
IPM Protection (Code:"H5"); Phase Loss (Code:"LD")
Charging Circuit Error(Code:"PU")

Test Operation & Troubleshooting & Maintenance
Page 12
5 Daily Maintenance and Repair
5.1 Daily Maintenance
In order to avoid damage of unit, all protecting devices in the unit had been set before outgoing, so the
user can never adjust or remove them.
For the first startup of the unit or next startup of unit after long-period stop (above 1 day) by cutting off the
power, please electrify the unit in advance to preheat the unit for more than 8hr
Never put sundries on the unit and accessories. Keep dry, clean and ventilated around the unit.
Remove the dust accumulated on the condenser fin timely to ensure performance of unit and to avoid
stop of unit for protection.
In order to avoid protection or damage of unit caused by blockage of water system, clean the filter in water
system periodically and frequently check water replenishing device.
In order to ensure anti-freezing protection, never cut off the power if ambient temperature is below zero in
winter.
In order to avoid frost crack of the unit, water in the unit and pipeline system not used for a long period
should be drained. In addition, open the end cap of water tank for drainage.
Never frequently make the unit on/off and close manual valve of water system during operation of unit by
users.
Ensure frequently check the working condition of each part to see if there is oil stain at pipeline joint and
charge valve to avoid leakage of refrigerant.
If malfunction of the unit is out of control of users, please timely contact with authorized service center of
company.
Note: the water pressure gage is installed in returning water line in the indoor unit, Please adjust the
hydraulics system pressure according to next item:
①If the pressure is less than 0.5 bar, please recharge the water immediately;
②When recharging, the hydraulics system pressure should be not more than 2.5 Bar.
5.2 Troubleshooting
Malfunctions
Reasons
Troubleshooting
Compressor does
not start up
Power supply has problem.
Connection wire is loose.
Malfunction of mainboard.
Malfunction of compressor.
Phase sequence is reverse.
Check out and re-fix.
Find out the reasons and repair.
Replace compressor.
Heavy noise of fan
Fixing bolt of fan is loose.
Fan blade touches shell or grill.
Operation of fan is unreliable.
Re-fix fixing bolt of fan.
Find out the reasons and adjust.
Replace fan.
Heavy noise of
compressor
Liquid slugging happens when liquid
refrigerant enters into compressor.
Internal parts in compressor are broken.
Check if expansion valve is failure and
temp. sensor is loose. If that, repair it.
Replace compressor.
Water pump does
not run or runs
abnormally
Malfunction of power supply or terminal.
Malfunction of relay.
There is air in water pipe.
Find out the reasons and repair.
Replace relay.
Evacuate.
Compressor starts or
stops frequently
Poor or excess refrigerant.
Poor circulation of water system.
Discharge or add part of refrigerant.
Water system is blocked or there is air in

Test Operation & Troubleshooting & Maintenance
Page 13
Low load.
it. Check water pump, valve and pipeline.
Clean water filter or evacuate.
Adjust the load or add accumulating
devices.
The unit does not
heat although
compressor is
running
Leakage of refrigerant.
Malfunction of compressor.
Repair by leakage detection and add
refrigerant.
Replace compressor.
Poor efficiency of hot
water heating
Poor heat insulation of water system.
Poor heat exchange of evaporator.
Poor refrigerant of unit.
Blockage of heat exchanger at water
side.
Enhance heat insulation efficiency of the
system.
Check if air in or out of unit is normal and
clean evaporator of the unit.
Check if refrigerant of unit leaks.
Clean or replace heat exchanger.

Test Operation & Troubleshooting & Maintenance
Page 14
5.3 Repair
5.3.1 Key Components
Picture
Name
Function
Compressor
It is the heart of the cooling system, mainly used to turn the
low-temperature, low-pressure refrigerant vapor to
high-temperature high-pressure vapor and then discharge it to
the evaporator. The two-stage enthalpy-adding compressor is
adopted herein, which can improve the heating performance of
the unit largely.
Electrostatic
Expansion Valve
It is one of four main components and used to turn the
hi-pressure liquid refrigerant to low-temperature, low-pressure
vapor-liquid mixture and adjust the refrigerant flow rate entering
the evaporator.
Vapor Liquid
Separator
It is installed at the side of the suction line, and used to prevent
liquid refrigerant entering the compressor, which if not avoided
will lead to wet compression or even liquid slugging.
4-way Valve
It is used the switch flow direction of refrigerant and then realize
switchover between cooling and heating. It also can be used for
defrosting through the counterflow.

Test Operation & Troubleshooting & Maintenance
Page 15
Picture
Name
Function
Plate Heat
Exchanger
It is the water-refrigerant plate type heat exchanger, used to
liquefy the high-temperature high-pressure vapor refrigerant or
evaporate the low-temperature low pressure liquid refrigerant.
Heat of condensation is taken away by circulation water and
heat for evaporation is supplied also by circulation water.
Water Pump
It is the power equipment for water circulation.
Expansion Tank
It is used to keep stable pressure of the water system. The tank
is charged with a certain volume of nitrogen which is separated
from the water side with a gasbag. When pressure of the water
side exceeds the nitrogen pressure, the gasbag will expand and
water enters into the tank so as to lower the pressure of the
water system. In contract, when pressure of the water system
goes down, nitrogen in the tank will expel water out to the water
system.
Flow Switch
It is used to prevent the heat exchanger from being frozen
owing to reduced water flow rate. When the flow rate goes down
to the point at which the flow switch will act, the switch will trip
off and the unit will raise an alarm and shut down.
Economizer
It is used in heating mode and water heating mode but NOT
used in cooling mode.On one side,it can increase the
subcooling before EXV,and on the other side it can enchance
the refrigerant in heating circuit.

Test Operation & Troubleshooting & Maintenance
Page 16
Picture
Name
Function
Safety Valve
It is used to prevent the pressure of circulation water from
increasing unusually. When the pressure is larger than the set
point (0.6MPa), this valve will open to relieve water pressure.
Exhaust Valve
It is used to expel air trapped inside the water system to make
sure normal operation of the system. It is usually installed at the
highest point of the system.
5.3.2 Charging and Discharging of Refrigerant
The unit has been charged with refrigerant before delivery. Overcharging or undercharging will cause
the compressor to run improperly or be damaged. When refrigerant is required to be charged or
discharged for installation, maintenance and other reasons, please follow steps below and nominal
charged volume on the nameplate.
Discharging: remove metal sheets of the outer casing, connect a hose to the charging valve and then
discharge refrigerant:
Note:
(a) Discharge is allowed unless the unit has been stopped. (Cut off the power and repower it 1
minutes later)
(b) Protective measures should be taken during discharging to avoid frost bites.
(c) When discharging is finished, if vacuuming cannot be done immediately, remove the hose to
avoid air or foreign matters entering the unit.
(d) Vacuuming: when discharging is finished, use hoses to connect the charging valve, manometer
and vacuum pump to vacuum the unit.

Test Operation & Troubleshooting & Maintenance
Page 17
Note:
when vacuuming is finished, pressure inside the unit should be kept lower than 80Pa for at least 30
minutes to make sure there is no leak. Either charging valve 1 or charging valve 2 can be used for
vacuuming.
Charging: when vacuuming is finished and it is certain that there is no leak, charging can be done.
Leak Detection Methods：
The following leak detection methods are deemed acceptable for systems containing flammable
refrigerants.
Electronic leak detector shall be used to detect flammable refrigerant, but the sensitivity may not be
adequate, or may need re-calibration(Detection equipment shall be calibrated in a refrigerant-free area).
Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used.
Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be
calibrated to the refrigerant employed and the appropriate percentage of gas (25% maximum) is
confirmed.
Leak detection fluids are suitable for us with most refrigerant but the use of detergents containing
chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper
pipe-work.
If a leak is suspected, all naked flames shall be removed / extinguished. If a leakage of refrigerant is
found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by
means of shut off valves) in a part of the system remote from the leak. Oxygen free nitrogen (OFN) shall
then be purged through the system both before and during the brazing process.
Note:
Before and during operation, use an appropriate refrigerant leak detector to monitor the operation area
and make sure the technicians can be well aware of any potential or actual leakage of inflammable gas.
Make sure the leak detecting device is applicable to inflammable refrigerant. For example, it should be
free of sparks, completely sealed and safe in nature.

Test Operation & Troubleshooting & Maintenance
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JF00303839