Venus Domestic VDH 100 User manual

& GUARANTEE CARD
Heat Pump Water Heater -
Domestic
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User Manual

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Dear Customer,
Thank you for purchasing Venus Heat Pump Water Heater. We have
enclosed this handy installation manual to help you correctly install
your system and in getting the maximum performance out of it.
There is also a section called “Trouble Shooting Guide” to assist you
in setting right minor problems.
We wish you and your new “VENUS HEAT PUMP WATER HEATER”
a lifetime of happy association
.
WARNING
1. Before installing this product, read and follow all warning
notices and instructions which are included. Failure to follow safety
warnings and instructions can result in severe injury, death, or property
damage. Call 044-43401500 for additional free copies of these
instructions.
2. This Domestic Heat Pump Water Heater is specifically designed
for domestic hot water supply. Do not use it for any other applications.
.

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Section 1
Introduction
Product Overview
General Features
1. Using heat energy from ambient air and reproduces more heat energy, saving
60%~80% energy compared to traditional heaters.
2. Providing hot water all the seasons for your house in domestic application.
3. No potential danger of any inflammable, gas poisoning, explosion, fire, electrical shock
which are associated with other heating systems.
4. A digital controller is incorporated to maintain the desired water temperature.
5. Long-life and corrosion resistant composite cabinet stands up to severe climates.
6. Japanese Panasonic rotary compressor ensures outstanding performance, ultra energy
efficiency, durability and quiet operation.
7. Self-diagnostic control panel monitors and troubleshoots heat pump operations to
ensure safe and reliable operation.
8. Intelligent digital controller with friendly user interface and blue LED back light.
9. The heat pump can operate down to ambient air temperature of -10°C. (14°F.)
Domestic Heat pump water heaters transfer heat from the ambient air to hot water tank,
providing the most energy efficient hot water supply as compared to gas, oil, or
electric heaters. Operation cost of domestic heat pump water heaters is 60％〜80%
less, saving your expenses in energy costs each year. Venus heat pumps are not only
highly efficient, but also easy and safe to operate. Venus domestic heat pump water heaters
are CE approved, using R407C refrigerant which is environmental-friendly and energy efficient.

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Section 2
Installation
The following general information describes how to install the domestic Heat pump
water heater.
Note: Before installing this product, read and follow all warning notices and
instructions. Only a qualified service person should install the heat pump.
Materials needed for Installation
The following items are needed and are to be supplied by the installer for all heat pump
installations:
1. Plumbing fittings.
2. Level surface for proper drainage.
3. Ensure that a suitable electrical supply line is provided. See the rating plate on the heat
pump for electrical specifications. Please take a note of the specified current rating. No
junction box is needed at the heat pump; Connections are made inside of the heat pump
electrical compartment. Conduit may be attached directly to the heat pump jacket.
4. It is advised to use PVC conduit for the electrical supply line.
5. Use a booster pump for pumping water in case of low water pressure.
6. A filter on the water inlet of tank is needed.
7. The plumbing should be insulated to reduce its heat loss.
Note: We recommend installing shut-off valves on the inlet and outlet water connections for
ease of serviceability.

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Domestic Heat Pump Water Heater Specification
Ambient Inlet/Outlet
Ø Ø Ø Ø
1250

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5. Adequate water flow.
This manual provides the information needed to meet these requirements.
Installation Location
CAUTION!
1. DO NOT install the heat pump near to hazardous materials and places.
2. DO NOT install the heat pump under deep sloping roofs without gutters which
will allow
3. Place the heat pump on a flat slightly pitched surface, such as concrete or
fabricated slab.
This will allow proper drainage of condensation and rain water from the base of the
unit. If possible, the slab should be placed at the same level or slightly higher
than the filter system/equipment.
application and installation procedures completely before continuing
Review all
the installation.
rain water, mixed with debris, to be forced through the unit.

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Installation details
All criteria given in the following sections reflect minimum clearances. However, each
installation must also be evaluated, taking into account the prevailing local conditions such
as proximity and height of walls, and proximity to public access areas. The heat pump must
be placed to provide clearances on all sides for maintenance and inspection.
1. The installation area must have good ventilation and the air inlet/outlet must not be
hindered.
2. The installation area must have good drainage and be built on a solid foundation.
3. Do not install the unit in areas accumulated with pollutions like aggressive gas (chlorine
or acidic), dust, sand and leaves etc.
4. For easier and better maintenance and troubleshooting, no obstacles around the unit
should be closer than 1000mm.(See Figure 1)
Figure 1
Air Inlet
Air Outlet
Over 1m
Over 1m
Over 1m
Over
1m
Heat Pump

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5. For the units which installed at the rack on the outer wall, the rack should be fixed with
wall-bolts. And the heat pump must be installed with shockproof bushes to prevent
vibration and/or imbalance.
6. Even though the controller is waterproof, care should be taken to avoid direct sunlight
and high temperature. In addition, the heat pump should be placed to ensure quality
viewing of the controller.
7. The plumbing pipes must be installed with proper support to prevent possible damage
due to vibration.
Running water pressure should be kept 0.2 Mpa to 0. 6Mpa.Otherwise, booster pump
or pressure reducing valve should be installed.
8. The acceptable operating voltage range should be within ±10% of the rated voltage.
When heat pump units are installed in parallel, ensure that the voltage differences,
between these units, are within ±2%.
9. The heat pump unit must be grounded /earthed for safety purposes.
10. If possible, the unit can be installed with auxiliary facility of rain, snow and sunlight proof.
Drainage and Condensation
Condensation will occur from the evaporator when the unit is running and drain at a steady
rate, depending upon ambient air temperature and humidity. The more humid the ambient
conditions, the more condensation will occur. The bottom of the unit acts as a tray to catch
rainwater and condensation. Keep the drain holes, located on the bottom pan of the unit
base, clear from debris at all times.
For the units which installed at the rack on the outer wall, proper drain hose should be
connected to the heat pump for condensation drainage.
Water Connections
Plumbing materials needed
Main Drain, Filter, Heat Pump, Ball Valve, Water Pump, One-way Valve.
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Symbol SymbolName
Ball Valve
Filter
Name
One-way Valve
Flow Direction

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Figure 2
The heat pump must be protected from Reverse flow of water. If there is any chance
provide a check valve between the water tank and the cold water inlet.
Refrigerant Pipe Connections at the Heat Pump
1. Wrap up the thin and thick connecting pipes and a wire to length with insulated band.
2. Screw off the two/three way stop valve and the caps of insulated water tank inlet and
outlet.
3. Take off the plastic blockage of the connecting pipes, connect them with the heat pump
and water tank, and tighten it with wrench.
Note: The force should be moderate. Too much effort, it’s easier to damage the joint,
too small effort, the joint cannot be sealed.
4. Remove the spool and valve needle cap of two/three way stop valve, open the spool of
small valve to 1/2 circle with an Allen wrench. On hearing the sound of gas flow,
withstand the valve needle core of the refrigerant inlet for 3 secs, repeat 3 times until
you feel the exhaust gas is cold.
5. Check the joints with soap water if leakage or not. Leakage cannot exist.
6. Open the two/three way stop valve completely with Allen wrench, and seal the cap.
7. The replenishment valve and stop valve may be required to be insulated, which depends
on the ambient temp at local, lest they freeze and burst in winter in use.
Plumbing installation requirements
1. When water pressure exceeds 0. 6Mpa, please use reducing valve to reduce the water
pressure to 0.3Mpa – 0. 6Mpa.
while

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2. Each part connected to unit needs to be connected with method of loose joint and
installed with intermediate valve.
3. Ensure that all plumbing has been properly completed and then proceed to do a water
leakage and pressure test.
4. All the pipelines and pipe fittings must be insulated to prevent heat loss.
5. Install a pressure release valve at the highest point of the system of heat preservation
tank, and it is advised to be installed outside.
6. Install a drain valve at the lowest point of the system to enable the system to be drained
during cleaning .
7. In order to reduce the back pressure, the pipes should be installed horizontally.
8. And minimize the elbows (90 degrees connections).
Electrical Connections
WARNING —Risk of electrical shock or electrocution.
Ensure that all high voltage circuits are disconnected before commencing heat
pump installation. Contact with these circuits could result in death or serious
injury to users, installers or others, due to electrical shock and may also cause
damage to property.
CAUTION — Label all wires prior to disconnection when servicing the heat pump.
Wiring errors can cause improper and dangerous operation. Check and ensure proper
operation after servicing.
General Information
Wiring connections must be done according to the wiring diagram found on the inside of the
heat pump access panel or see addendum A.
The heat pump must be grounded / earthed. A ground Terminal is provided on the inside
of the heat pump electrical compartment. (See Figure 3)
Single System Single Phase
(Figure 3)

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Power supply
1. If the supply voltage is too low or too high, it can cause damage and/or result in unstable
operation of the heat pump unit, due to high in rush currents on start up.
2. The minimum starting voltage should be above 90% of rated voltage. The acceptable
operating voltage range should be within ±10% of the rated voltage. The voltage
difference between phases of a three phase power supply should be within ±2%.
3. Ensure the cable specifications meet the correct requirements for the specific
installation. The distance between the installation site and mains power supply will affect
the cable thickness. Follow the local electrical standards to select the cables, circuit
breakers and isolator breakers.
Grounding
In order to prevent electrical shock in case of leakage from unit, install the domestic air to
water heat pump water heater according to electrical standards.
1. Do not interrupt the voltage supply to the heat pump frequently as this may result in
a shorter life expectance of the heat pump.
Controller PC board Settings
The Controller PCB has a pin selectable toggle switch which must be set according to the
specific installation requirement.
NOTE:
Before any changes are made to the pin settings, ensure that the mains supply power
is OFF at the circuit breaker or physically disconnected from the mains supply.
The single system heat pump unit controller PC Board consists of a 3-pin selectable toggle
switch.
Single system and single phase
Figure 4: Switch Layout
Note: When switch 1 is set to OFF, circulation pump will function. ON, it doesn’t.
When switch 2 is set to OFF, electric heating will function. ON, it doesn’t.
When switch 3 is set to OFF, expansion valve will function. ON, it doesn’t.
123
ON
OFF
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123
ON
OFF

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Factory Default Setting
Description Switch1 Switch2 Switch3
1 phase, Domestic air
to water heat pump
water heater, Cycle
heating
ON ON ON
Electrical Wiring Diagram

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Section 3
Operating Heat Pump
LCD User-Friendly Interface Controller
General instruction
The control panel applies to a single system single phase domestic air to water heat pump
water heater.
The operation panel features:
1. Capacitive touching keys for higher operating sensitivity and unlimited key operations.
2. Minimal electromagnetic susceptibility and interference.
3. Stylish appearance for easy viewing purposes.
4. Dust Proof.
5. Automatic Key Lock function (AKL).
Controller panel
Operating Controller
Operation guide
When the power supply to the air to water heat pump water heater is switched on for the first
time, an audible tone is heard from the controller. The LCD will be displayed in a dimming
mode (no back light). At this time the touch keys are locked (see “lock key display” symbol).

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Keys explanation:
Unlocking Keys:
Press the “power” key for 3 seconds until you hear an audible tone, then
release the key. The back light of the LCD display will turn on and the key pad is unlocked
with no “lock key display” symbol. The keypad will automatically lock after 60 seconds,
displaying the “lock key display” symbol.
“
power” key: By pressing the “power” key, the unit can be switched ON or OFF.
“up” and “down” keys: Press to Increase and Decrease values.
“setting” key: Press for Inquiry, Parameter and Password setting
“timer” key: Press for timer setting, timer eliminate and clock setting.
Controller Set-Up
2. System status display values:
Make sure key-pad is unlocked.
Press the “setting” key and enter into inquiry panel
with “inquire” symbol on display.
1. Temperature setting:
Make sure key-pad is unlocked.
Press the “up” key, “temperature setting” symbol is
flashing and the set temperature is displayed. Press the “up” key again, the displayed
temperature will increase. Press the “down” key, “temperature setting” symbol is flashing
and the set temperature is displayed. Press the “down” key again, the displayed
temperature will decrease. The range of water temperature can be set from 20°C (68°F)
to 60°C (140°F) (default = 55°C (131°F)).

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The inquiry codes are from A1 to Er. By pressing the “setting” key sequentially, the
desired inquiry code will be selected and value displayed. To exit the inquiry panel,
press the “setting” key once after the last inquiry code (Er) is reached. Details are shown
as follows:
A1—coil pipe temp.
A2—compressor suction temp.
A3—compressor discharging temp.
A4—ambient temp.
Er—error code
3. Parameter setting:
NOTE: THESE SETTINGS ARE PRE-SET ACCORDING TO THE
MANUFACTURER’S SPECIFICATION FOR SAFE HEAT PUMP OPERATIONS. DO
NOT CHANGE THESE SETTINGS AS IT WILL INFLUENCE THE SAFE OPERATION
OF THE HEAT PUMP.
Press the “setting” key for more than 3 seconds, until an audible tone is heard and enter
into the setting panel with “setting” symbol on display.
By pressing the “setting” key sequentially, the desired setting code will be selected. The
value of each setting can be adjusted by pressing “up” and “down” keys (Setting values
see below). To exit the setting panel, press the “setting” key once after the last setting
code (P6) is reached.
Details are shown as follows:
/ / / - Set water temp in tank (30°C-99°C (86°F~210.2140°F), default: 50°C(122°F))
L1- Setting is used to compensate/calibrate for the difference between displayed water
temperature (A6) and the actual measured water temperature in tank (use a good
quality thermometer). (0~15°C (32°F~59°F), default: 0°C (32°F))
L2- Minimum outlet water temperature deviation. This value setting is set to indicate to

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the compressor when to re-start until desired temperature is reached. (3~18°C
(37.4~64.4°F) default: 5°C (37.4°F)). For example, set water temp. = 25°C (77°F), L2 =
5°C (41°F), the compressor will stop at 25°C (77°F) and re-start at 20°C (68°F)
L4- Desired water temperature limit (30~99°C (86~210.2°F) default: 60°C (140°F))
L5- allowed electric heating ambient temperature (0~35°C (32~), default: 7°C (44.6°F),
where 0°C (32°F) means no electric heating).
L9- Two speeds wind temp control the fan motor. (10°C -45°C (50°F~113°F), default:
45°C (113°F)) (Not Applicant)
H1-defrosting period (20~99 minutes default: 45 minutes)
H2- defrosting start temperature (1~-15°C (33.8~5°F) default: -1°C (30.2°F))
H3-defrosting time (5~20miniutes default: 8 minutes)
H4-defrosting exiting temperature (1~40°C (33.8~104°F), default: 20°C (68°F))
P1-electronic expansion valve regulation cycle (20~180 seconds, default: 60 seconds)
P2- degree of super heat (-8~15°C（17.6~59°F）, default 0°C（32°FZ))
P3- allowed discharge temperature (70~135°C (158~275°F), default: 92°C (197.6°F))
P4- expansion valve opening as four-way valve is defrosting (6~55°C (42.8~), default:
32 °C (89.6°F))
P5-expansion valve minimum opening (6~30°C (42.8~86°F), default: 15°C (57°F))
P6-super heat compensation (0~12 default: 4)
Note: If the controller is chosen with electronic expansion valve not used (the toggle
switch 3 on controller PC Board is on OFF.), it doesn’t display P1-P6 when setting.
4. Clock setting:
Press the “timer” key for more than 8 seconds until an audible tone is heard and the
“timer” symbol disappears. The hour value is flashing and can be adjusted by pressing
“up” and “down” keys. Press the “timer” key for minute adjustment and repeat as
previous. Press the “timer” key to exit.
5. Timer setting:
The heat pump consists of two separate timing functions. Timer 01 and 02 are used to
set the ON/OFF times of the heat pump within 24 hour period.
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Heat pump ON/OFF timers:
01—ON/OFF timing
02 — ON/OFF timing
Press the “timer” key and enter timer 01 ON time. Set the ON time as in Clock Setting
section. Press “timer” key again to set timer 01 OFF time. Set the OFF time as in Clock
Setting section. Repeat sequence until all timer settings are completed.
If, however, a timer is not used, set ON and OFF times to 00:00. Timer setting can be
randomly selected. For example, Timer 01 ON, Timer 02 OFF.
After completing all timer settings, the controller will display the following:
To cancel the timer feature, press the “timer” key for more than 3 seconds until an
audible tone is heard, then release key, timer is now cancelled.

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of the heat pump on a monthly basis by monthly password control. For example: If there
is an agreement which involves monthly installment, the installer/agent can utilize this
feature by applying password control.
Press the “setting” key for more than 3 seconds until an audible tone is heard and
release key, enter into setting panel with “setting” symbol and “L” settings on display.
Press the “setting” key for more than 8 seconds until an audible tone is heard and
release key, enter into Password Control with “C” on display.
Set-up installer/agent Password
The installer/agent Password consists of 4 groups of double digit numbers (C1 to C4
with range from 00 to 99). Choose your Password carefully to avoid any unauthorized
access.For example: If C1 = 79, C2 = 04, C3 = 33 and C4 = 07 then the Password
is 79043307.
Now enter C5. C5 (range from 01 to15, 00 disables installer/agent Password) indicates
the period in number of month(s), 30 days/month. For example: C5 = 08, the unit will be
disabled after 8 months (240 days). To enable the unit, Password is needed.
How to enable the unit
Press the “setting” key for more than 3 seconds until an audible tone is heard and
release key, enter into setting panel with “setting” symbol and “L” settings on display.
Then press the “setting” key for more than 8 seconds until an audible tone is heard and
release key, enter into Password Control with “C” on display. Input Password to enable
the heat pump and reset C5 (range from “01” to “15”, “00” disables installer/agent
Password) to desired period. If an incorrect password is provided the heat pump the
Error Code 11E will be displayed.
Forgotten/Reset Password
This function enables the installer/agent to enable the heat pump unit in the event of a
forgotten password. All preset settings will be reverted back to the original factory
default settings once the heat pump is enabled.
Make sure that the lock symbol “ “is on display, press the “setting” key until an
audible tone is heard and the display back light is lit, release key. The clock will now
display, “00:” and the heat pump unit is enabled.
This feature enables the installer/agent to have control and use of the normal operation
6. Installer Password Control :

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REMEMBER:All preset settings is reverted back to the original factory default
settings. The password function will be disabled (C1=01, C2=01, C3=01, C4=01,
C5=00). Please ensure that the heat pump unit is set up correctly. (Refer to
controller set-up)
7. Manual / Forced Defrosting:
Although this heat pump features an automatic defrosting function, a manual defrosting
function enables the user to manually defrost the heat pump when unusual frosting
appears.
Make sure key-pad is unlocked. Ensure that heat pump unit is in running mode,
displaying the heat symbol.
Press the “ ”key for more than 8 seconds until an audible tone is heard, and release key.
The heat pump will be in defrosting mode and the “defrost” symbol will be on display--
.
8. Heating mode:
Heating mode--: In heating mode, the heat pump will function as a swimming pool
heater, ensuring that the swimming pool water is kept to a set water temperature.
General Operating Guide
Initial Start-up Precautions
CAUTION — Refrain from using this heat pump if any electrical components have
been in contact with water. Immediately call a qualified service technician to inspect
the heat pump.
CAUTION — Keep all objects clear above the heat pump. Blocking air flow could
damage the unit and may void the warranty.

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REMEMBER:All preset settings is reverted back to the original factory default
settings. The password function will be disabled (C1=01, C2=01, C3=01, C4=01,
C5=00). Please ensure that the heat pump unit is set up correctly. (Refer to
controller set-up)
7. Manual / Forced Defrosting:
Although this heat pump features an automatic defrosting function, a manual defrosting
function enables the user to manually defrost the heat pump when unusual frosting
appears.
Make sure key-pad is unlocked. Ensure that heat pump unit is in running mode,
displaying the heat symbol.
Press the “ ”key for more than 8 seconds until an audible tone is heard, and release key.
The heat pump will be in defrosting mode and the “defrost” symbol will be on display--
.
8. Heating mode:
Heating mode--: In heating mode, the heat pump will function as a swimming pool
heater, ensuring that the swimming pool water is kept to a set water temperature.
General Operating Guide
Initial Start-up Precautions
CAUTION — Refrain from using this heat pump if any electrical components have
been in contact with water. Immediately call a qualified service technician to inspect
the heat pump.
CAUTION — Keep all objects clear above the heat pump. Blocking air flow could
damage the unit and may void the warranty.