INVENTOR DHW-C3.5/A1-K User manual

CONTENTS
PRODUCT INTRODUCTION ...................................................................................2
1 MODELS LIST............................................................................................................................. 2
2 NOMENCLATURE ...................................................................................................................... 3
3 FUNCTION .................................................................................................................................. 3
4 PRODUCT DATA......................................................................................................................... 4
4.1 Product Data at Rated Condition........................................................................................ 4
4.2 Operation Range................................................................................................................. 6
4.3 Operation Performance ...................................................................................................... 6
5 PIPING DIAGRAM...................................................................................................................... 8
UNITS CONTROL ....................................................................................................11
1 OPERATION FLOWCHART ..................................................................................................... 11
2 MAIN LOGIC............................................................................................................................. 12
2.1 Heating Mode................................................................................................................... 12
2.2 Defrosting Mode .............................................................................................................. 12
3 WIRED REMOTE CONTROLLER........................................................................................... 12
3.1 Dimension ........................................................................................................................ 12
3.2 Function ........................................................................................................................... 12
3.3 Installation........................................................................................................................ 17
INSTALLATION........................................................................................................20
1 UNITS INSTALL........................................................................................................................ 20
1.1 Installation Positions ........................................................................................................ 20
1.2 Matters need Attention ..................................................................................................... 20
1.3 Dimension Data................................................................................................................ 20
2 ELECTRIC WIRING WORK..................................................................................................... 24
2.1 Wiring Principle ............................................................................................................... 24
2.2 Electric Wiring Design..................................................................................................... 24
2.3 Specification of Power Cord & Air Switch ...................................................................... 26
UNITS MAINTENANCE..........................................................................................29
1 ERROR CODE LIST .................................................................................................................. 29
2 FLOW CHART OF TROUBLESHOOTING.............................................................................. 30
3 WIRING DIADRAM.................................................................................................................. 34
4 DISASSEMBLY AND ASSEMBLY PROCEDURE OF MAIN PARTS.................................... 37
5 EXPLODED VIEWS .................................................................................................................. 43

1
PRODUCT

HEATPUMPWATERHEATER PRODUCT
3
2 NOMENCLATURE
1
NO. Description Options
1 INVENTOR Heat Pump Water Heater
NO. Description Options
1
Symbol of heat
pump water
tank
WT
2 Tank type Lack-common heat pump water tank; V- heat pump water tank for multi VRF system
3 Function code Lack-no electric heating function; D- electric heating function available
4 Nominal water
tank volume 100=100L 150=150L 200=200L
5 Structure type
B-Wall Mounted Type˗L-Floor Standing Type
6 Bearing Lack-non-bearing water tank; C-bearing water tank
7 Type of heat
exchange tube
Lack-no heat exchanger; J-inner coil static heating(J-single coil; J2-double coils);
JW-outer coil static heating; D-heating coil with floor (D-single coil; D2-double coils)
8 Serial number
AǃBǃC……
9 Power 220~240V-1Ph-50Hz
3 FUNCTION
Function Description
Efficient and
energy saving
The unit is automatically adjusted by electronic expansion valve.
COP is 3-5. Running cost is 1/4 of that of electric water heater, 1/3 of that of gas
water heater and 1/2 of that of fuel water heater.
Safe and
environmental
friendly
There is no need of any electric heating or complete separation between water
and electricity to avoid possible electric shock. Without possible toxicities of
CO, user’s safety can be ensured.
Reliable and Adopting special compressor, the unit is resistant to high temp and pressure. The
WT-SX
 D 250 L C  / B1 - K
1 2 3 4 5 6 7 8 9
DHW - C 3.5 /A1 - K
23456
DHW
2Heating style S= Static ,C =Circulating
Heating Capacity
3
3.5KW
Refrigerant
4
Nb=R134a, Default=R22
5Design Serial Number
A1
Power style
6
220~240V-1Ph-50Hz

HEATPUMPWATERHEATER PRODUCT
4
durable water tank adopts advanced stainless steel inner container with ultra-long dual
magnesium sticks to ensure long lifespan of the system.
Easy installation
Without limitation of environment, the unit can be installed in kitchen, bathroom,
balcony, garage, stock room or basement. It is also suitable for skyscrapers, villa,
and so on.
Easy operation
Water temperature can be set. Water supply can be on or off depending on water
temperature and water volume, so that hot water can be supplied at any time.
Unit on/off can be set by user according to requirements (the unit will stop once
water temperature reaches the setting point). Running of unit in electric
platykurtosis is possible to reduce cost.
Intelligent
defrosting
The unit with anti-freezing and intelligent defrosting functions can efficiently
prevent freezing and frosting.
All-day use The unit can make and supply hot water all day in despite of night, overcast and
rainy days.
4 PRODUCT DATA
4.1 Product Data at Rated Condition
C5.0/A1-K DHW-C7.2/A1-K
Nominal
Capacity Heating
kW 3.5 5.0 7.2
Btu/h 11942 17060 24566
Power
Consumption Heating kW 0.9 1.15 1.75
Power Supply 220-240V ~1Ph~50Hz
Safeties High/Low pressure switch, compressor thermal protection, overcurrent
protection, lack of phase/anti-phase protection, antifreezing protection, R22
Refrigerant Type R22
Charge kg 0.65 1.0 1.0
Compressor Type Rotary
NO. 1 1 1
Condenser
Heat Exchanger Tube-in-tube
Water
In/Out
Pipe
Diameter
Inch 3/4 3/4 3/4
Evaporator
Heat Exchanger Fin type heat exchanger
Fan
Motor
Power
Input
W 30 30 48
Unit / Packing
Dimension
Height mm 750/800 750/800 882/930
Width mm 762/878 762/878 870/994
Depth mm 256/360 256/360 378/428
Net/Gross Weights kg 50/56 55/61 68/79
Models DHW-C3.5/A1-K DHW-

HEATPUMPWATERHEATER PRODUCT
5
Nominal
Capacity Heating
kW 3.8 5.0
Btu/h 12966 17060
Power
Consumption Heating kW 1.02 1.35
Power Supply 220-240V ~1Ph~50Hz
Safeties
High/Low pressure switch, compressor thermal protection,
overcurrent protection, lack of phase/anti-phase protection,
antifreezing protection, R134a
Refrigerant Type R134a
Charge kg 0.7 0.95
Compressor Type Rotary
NO. 1 1
Condenser
Heat Exchanger Tube-in-tube
Water
In/Out Pipe
Diameter
Inch 3/4 3/4
Evaporator
Heat Exchanger Fin type heat exchanger
Fan Motor
Power
Input
W 30 30
Unit / Packing
Dimension
Height mm 750/800 750/800
Width mm 762/878 762/878
Depth mm 256/360 256/360
Net/Gross Weights kg 55/61 60/66
Note:1Ton =12000Btu/h = 3.517kW
Water tank model
WT-SX400LC/B1-K
Capacity L 150 200 250 300 350 400
Outline
dimension
˄OD×H˅
mm 520×1350 540×1595 540×1945 620×1620 620×1895 620×2125
Package
(W*D*H) mm 1375×610×605 1620×630×625 1970×630×625 1645×710×705 1920×710×705 2150×710×705
Net weight kg 42 55 66 69 77 84
Gross weight kg 50 63 75 79 88 96
Dimension o
f
connecting
pipe between
main unit and
water tank
mm DN20 DN20 DN20 DN20 DN20 DN20
Connecting
dimension of
water pipe
terminal
mm DN15 DN15 DN15 DN15 DN15 DN15
Models DHW-C3.8/NbA-K DHW-C5.0/ NbA-K
WT-SX150LC/B1-K
WT-SX200LC/B1-K
WT-SX250LC/B1-K
WT-SX300LC/B1-K
WT-SX350LC/B1-K

HEATPUMPWATERHEATER PRODUCT
6
Water tank model WT-150LC-K WT-200LC-K WT-250LC-K WT-300LC-K
Capacity L 150 200 250 300
Outline dimension
˄OD×H˅mm 520×1350 540×1595 540×1945 620×1620
Package (W*D*H) mm 1375×610×605 1620×630×625 1970×630×625 1645×710×705
Net weight kg 45 57 68 71
Gross weight kg 52 66 77 81
Dimension of
connecting pipe
between main unit and
water tank
mm DN20 DN20 DN20 DN20
Connecting dimension
of water pipe terminal mm DN15 DN15 DN15 DN15
(1) Test conditions of the above data: outdoor ambient temp: 20ćDB/15ćWB, water tank initial/
ending temp: 15ć/55ć
(2) If there is any change of product specification, please refer to the nameplate.
4.2 Operation Range
Model Range of Outdoor Temperature ( )ć
Heating -7~45ć
4.3 Operation Performance
During heating, the water is heated by the unit absorbing heat energy from outside and then releasing it
to the water in water tank. Heating capacity may be reduced if outdoor temperature is decreased. The
following chart is for reference.
DHW-C3.5/A1-K Water Yield Capacity Correction

HEATPUMPWATERHEATER PRODUCT
7
DHW-C5.0/A1-K Water Yield Capacity Correction
DHW-C7.2/A1-K Water Yield Capacity Correction
DHW-C3.8/NbA-K Water Yield Capacity Correction

HEATPUMPWATERHEATER PRODUCT
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DHW-C5.0/NbA-K Water Yield Capacity Correction
5 PIPING DIAGRAM
Name compressor 4-way
valve
Stop
Va l v e
Check
Va l v e Capillary Filter
Electronic
Expansion
Va l v e
Sign
Name Temperature
Sensor
Pressure
Switch
Heat
Exchanger
with Axial
Flow Fan
Heat
Exchange
with Cross
Flow
Blower
Heat
Exchanger
with
Centrifugal
Fan
Thermal
Expansio
n Valve
Gas
Liquid
Separator
Sign

HEATPUMPWATERHEATER PRODUCT
9
water pump
water tank
heat exchanger
compressor
evaporator
liquid-gas separator
pressure switch
expansion valve
water inlet
The energy-saving water heater makes use of heat pump. Through thermal circulation, it absorbs
heat from the surroundings (air source). Via the compressor, the heat is sent to the condenser and
released to the water in water tank. The principle is the same as that of heat pump air conditioner,
except that the heat pump air conditioner absorbs heat from the environment and supplies heat to the
indoor air, while the energy-saving water heater heats the water with this heat. Its COP is 3 times
higher than that of the traditional electric water heater. It is an efficient, energy-saving, and
environmental friendly product.

10
CONTROL

HEATPUMPWATERHEATER CONTROL
11
UNITS CONTROL
1 OPERATION FLOWCHART

HEATPUMPWATERHEATER CONTROL
12
2 MAIN LOGIC
2.1 Heating Mode
When press ON button, if the temperature of water tank meets the heating requirements, the outdoor
fan will start running. The compressor will run after 15s.
If the temperature of water tank is above the set temperature, the unit will stop, and all loads will
terminate. The outdoor fans will stop after 15s.
2.2 Defrosting Mode
Condition of defrosting:
In heating mode, if the accumulative running time of compressor is beyond the set interval time of
defrosting ˄default 45min ˅ˈ and the defrosting temperature is lower than the set starting
temperature(default -4ć), the unit will start defrosting. In that case, the 4-way valve will shut off and
the outdoor fan will stop after 2s.
Condition of stopping defrosting:
In defrosting mode, if the continual defrosting time is beyond the set continual time of defrosting
˄default 8min˅ˈand the defrosting temperature is beyond the set stopping temperature, the unit will
restart heating. In that case, the 4-way valve will be open and the outdoor fan will run.
3 WIRED REMOTE CONTROLLER
3.1 Dimension
D
C
B
A
3.2 Function
3.2.1 Operation View
Functions and Wired Controller

HEATPUMPWATERHEATER CONTROL
13
1. Check button 2. Timer button 3. Increase button for temp and clock 4. Mode button
5. Prior button 6. Rapid button 7. Decrease button for temp and clock 8. On/off button
NO. Function description
1 Display of rapid hot water, hot water prior, air conditioning prior
2 Display of system time, timer, preset timer and running parameters
3 Icons display of heating up and standby for keeping the same temperature
4 .Display of hot water, save, preset and nightwork mode
5 Display of lock
6 Display of defrosting
7 Display of E-heater on
8 Display of actual water temperature, setting water temperature, error code and
running parameters
9 Display of antifreezing function
10 Display of floor radiator on (this unit hasn’t this function)

HEATPUMPWATERHEATER CONTROL
14
3.2.2 Display View
Instruction to Functions and Operation of Wired Controller
Notice:
If there is not any button operation for 15s, the wired controller will be half light. In that case, the
wired controller can be normally operated only by pressing any button to make it light.
3.2.2.1 On/off
Press On/Off button to turn on the water heater. Repress it to turn off the water heater
Note: After energization and under normal communication, the LCD will display water temperature
and time both under on and off states of the unit. It suggests off state if the LCD does not display
runningmode.
3.2.2.2 Mode Setting
Under on state of unit, press Mode button to switch the running modes as the following sequence:
As shown in the right figure, it is in Hot water mode with
rapid button pressed.
Hot water mode: according to present water temperature,
water heater immediately starts up or stops heating.
Save mode: Upper limit of setting temperature is 50 .ćOther
functions are the same as they are in hot water mode.
Preset mode: Preset time of hot water. The water heater will
decide advance startup time of unit according to the ambient
temperature and then decide startup and stop of compressor
according to the difference between actual water temperature
and setting water temperature. It will stop 1h after preset time. Once set, it will run circularly every
day.
Nightwork mode: Fix preset time of hot water to 00˖00 to 06˖00 so that the water heater starts up
Hot
water
Save Preset Night
work

HEATPUMPWATERHEATER CONTROL
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during this period and decides startup and stop of compressor according to the difference between
actual water temperature and setting water temperature. Once set, it will run circularly every day.
3.2.2.3TemperatureSetting
Press / to increase or decrease setting water temperature. When long press it, the temperature will
increase or decrease by 1ćper 0.5 second.
Water temperature setting range: 35ć58 (50 underćć
save mode)
As shown in the right figure.
3.2.2.4 Timer Setting
(1)Timer On/Off Setting
In Hot water or Save mode, press Timer to set timer on/off.
Timer setting: Press “Timer” button and LCD will display
Timer XX: XX on (under on state of unit, Timer XX: XX
off is displayed), with numbers of hour flashing. In that
case, press / to adjust the hours. Repress Timer button and numbers of minute will flash. In this
case, press / to adjust minute. At last, repress Timer to complete timer setting.
Cancel Timer: After timer setting, press Timer. In that case, LCD won’t display timer, and timer is
cancelled.
Timer range: 00˖00 23˖59. Every press of  or  will increase or decrease the time of timer by 1
h or 1 min. Long press either of them, and the time of timer will automatically increase or decrease by 1
h or 1 min per 0.5 second.
(2) Preset Time Setting
In preset mode, the present preset time will start automatically. Press Timer to preset time.
Preset time setting: Press Timer button, and the LCD
displays “Preset xx: xx” and numbers of hour will flash. In
this case, press / to adjust hour. Repress Timer button,
and numbers of minute will flash. In this case, press /
to adjust minute. At last, repress Timer to complete preset
time setting.
Preset time range: 00˖00 23˖59. Every press of  or
 will increase or decrease preset time by 1 h or 1 min.
Long press either of them, and then preset time will
automatically increase or decrease by 1 h or 1 min per 0.5
second.
Preset mode is circularly startup. Water heater will heat water according to preset time every day and
advance time corresponding with ambient temperature and then stop heating 1 h after preset time.
˄3˅System Time Setting
Press check button and defaulted check code 00 will be displayed in water temperature displaying area.

HEATPUMPWATERHEATER CONTROL
16
Under check state and when check codes are 00, press Timer button to set system time.
In this case, the LCD displays “xx: xx” and numbers of hour
will flash. Press / to adjust hou. Repress timer button, and
numbers of min will flash. In this case, press / to adjust
min. If system time is not needed, press check button to quit or
let it quit automatically after 15s without any operation.
Repress timer button to confirm time setting and the time
won’tflashanymore.
Range system time: 00˖00 23˖59. Every press of  or 
will increase or decrease setting time by 1 h or 1 min. Long
press either of them, and then system time will automatically
increase or decrease by 1 h or 1 min per 0.5 second, as shown
in the right figure.
3.2.2.5 Special Functions
(1) Lock Function
Press and  at the same time for 5s, the wired controller
will display lock icon. In that case, buttons of wired controller
are invalid and lock icon will flash if operating any button.
Repress  and  at the same time for 5s, and the lock icon
will disappear and functions of wired controller will resume.
If malfunction occurs, lock function will be invalid for a
while. Once it is released, lock state will resume. Lock state
will be memorized upon power failure.
˄2˅Cleaning Function
During stop of unit without malfunction, press Mode and 
at the same time for 5s, and the wired controller will enter
into cleaning state. LCD will circularly display Hot Water,
Save, Preset and Nightwork (refer to the right figure). Repress
Mode and  at the same time for 5s to quit.
Cleaning function can maintain max 30 min. After startup,
On/Off button is shielded. Once malfunction occurs, cleaning
function will automatically quit.
˄3˅Parameters Check
This function is usually for debugging personnel.
When press check button into checking state, checking code flashes and corresponding parameters are
displayed in clock displaying area. Press  and  to switch among code.
3.2.2.6 Malfunction Display
If malfunctions occur during operation of system, temperature displaying area will display error codes.

HEATPUMPWATERHEATER CONTROL
17
When malfunction occurs ˈwired controller shields all functions except On/off and checking
functions .The outdoor unit is off.
If multiple malfunctions occur at the same time, error codes will be displayed in cycle.
If wired controller displays malfunction, please turn off the unit and ask professionals for help.
Refer to error codes in the last page for reference.
3.3 Installation
Installation Location of Wired Controller
1. Never install wired controller in wet place or under sunlight directly.
2. Never install the unit and wired controller in the place where there is electromagnetic interference.
3. Make sure communication line is connected to correct port to avoid communication malfunction.
Installation of Wired Controller and Project Debugging
Pay attention to the following items during installation of wired controller:
1. Cut off power supply of heavy-current wire embedded in mounting hole in the wall before installation.
It is prohibited to perform the whole procedure with electricity.
2. Pull out 4-core twisted pair line in mounting hole and then make it through the rectangle hole at the
back of controller’s soleplate.
3. Join the controller’s soleplate on wall face and then fix it in mounting hole with screws M4X25.
4. At last, insert the 4-core twisted pair through rectangle hole into controller’s slot and buckle the front
panel and soleplate of controller together.
No. 1 2 3 4 5
Description
Socket’s base
box installed in the
wall
Soleplate of
controller
Screw
M4X25
Front panel of
controller
Screw
ST2.2X6.5

HEATPUMPWATERHEATER CONTROL
18
Caution:
During connection of wirings, pay special attention to the following items to avoid interference of
electromagnetism to unit and even failure of it.
1. To ensure normal communication of unit, signal line and wiring (communication) of wired controller
should separate from power cord and indoor/outdoor connection lines. The distance between them
should be kept 20cm in min.
2. If the unit is installed at the place where there is interference of electromagnetism, signal line and
wiring (communication) of wired controller must be shielding twisted pair lines.