KRS KRS118B User manual

Installation and Operation Manual
Do not operate this water heater without reading the Manual.
If the power cord is damaged, it must be replaced by a qualified person in order to avoid danger.
Air Source Heat Pump Water Heater

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Table of Contents
1. Safety instructions
2. Product description
2.1 Product features
2.2 Working mode
2.3 Product appearance
3. Storage, handling, transportation and installation
3.1 Storage and transportation
3.2 Handling
4. Installation
4.1 Placement space requirements
4.1.1 Installation location and space requirements
4.1.2 Electrical requirements
4.2 Installation method
4.2.1 Equipment fixation
4.2.2 Water pipe connection
4.2.3 Condensate drain pipe
4.2.4 P/T valve installation
4.2.5 Thermal expansion tank (not provided)
4.2.6 Temperature limiting device (not provided)
4.2.7 Pressure limiting valve (not provided)
4.2.8 Remote wire controller installation
4.3 Installation check points
4.3.1 Water tank position
4.3.2 Pipeline connection
4.3.3 Condensate drain hose
4.3.4 P/T valve and drain line must comply with local regulations
4.3.5 Electrical connection
4.3.6 Check the wire controller
4.3.7 Confirm whether there is a problem with the machine settings
4.4 Heat pump start-up

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5. Operating instructions
5.1 Precautions for use
5.2 Safety warning
5.3 Operating instructions
5.3.1 Start-up & Shutdown operation
5.3.2 Temperature setting
5.3.3 Working mode setting
5.3.4 Time setting
5.3.5 Timing setting
5.3.6 Manual forced defrosting
5.3.7 Manual start of auxiliary electric heater
5.3.8 Manual forced start of circulating pump
5.3.9 Child lock function
5.3.10 Screen protection function
6. Inspection and maintenance
6.1 Inspection and maintenance precautions
6.2 Inspection items
6.2.1 P/T valve
6.2.2 Water tank flushing
6.2.3 Water tank emptying
6.3 Holiday and long-time shutdown
6.4 Cleaning of condensate drain pipe
6.5 Refrigerating circuit
6.6 Magnesium anode rod maintenance
6.7 Check/Replacement of magnesium anode rod
7. Fault code display
8. Environmental protection

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1. Safety instructions
The warnings in the manual are marked with a triangular warning sign.
Failure to comply with these warnings may result in serious consequences or even death.
Warnings
This water heater is not suitable for water heating in swimming pools.
The water heater should be placed where it won’t damage the adjacent area or underlying
structure of the heat pump water heater even if there is leak at the water heater or the joint. When
these installation locations cannot be avoided, it is recommended to install a suitable water drain
pan in the lower part of the water heater for adequate drainage of water.
If the water heater is installed in a closed water supply system, measures should be taken to
prevent hot water from flowing back; for example, a check valve is installed on the cold water
supply pipeline to prevent hot water from flowing back due to thermal expansion.
Before manually operating the temperature and pressure safety valve (hereinafter referred to as
P/T valve), preventive measures must be taken to avoid the risk of scalds by the hot water flowing
out from the P/T valve.
The thermal expansion of the closed water supply system may cause the P/T valve to periodically
relieve pressure. Contact the water heater supplier for how to correct this situation. DO NOT
BLOCK THE P/T VALVE.
The P/T valve should be inspected every 6 months for its performance or replaced at an interval
of not more than 2 years. The P/T valve should be replaced more frequently in the high-occurrence
areas of water subsidence.
When using and reusing the refrigerant, please comply with relevant environmental regulations.
The refrigerant is not allowed to be discharged into the environment. R134a refrigerant is used
for this equipment, which is non-flammable and does not have a devastating effect on the ozone
layer.
When processing or operating components related to the refrigerant circuit, the refrigerant should
be discharged to ensure safe operation.
The high pressure insulation test of the water heater can only be carried out between the live wire
and the ground wire as well as the null line and the ground wire. The test between the live wire
and the null line will damage the electronic equipment.
All electrical installation and wiring must be performed by qualified professionals and subject to
wiring rules and the requirements of the local authority.

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Risk of electric shock: Please turn off the power before performing equipment repairs. Failure to
do so may result in serious personal injury or death.
When the circuit board, controller or display is repaired, all wires shall be first labeled and then
disconnected. Wiring errors can result in incorrect and dangerous operation. The wiring must be
reconfirmed after repair.
The water tank may be frost-cracked due to low temperatures. Do not turn off the power to the
equipment. If it needs to turn off the power or there is a power outage, and there may be frost-
crack because of low temperatures, the water should be discharged from the water tank.
Do not store or use gasoline or other flammable, explosive or corrosive gases and liquids near
this equipment.
The water heaters must be installed, commissioned and repaired by authorized personnel in
accordance with local laws and regulations.
It should ensure that the surrounding area of installed equipment is clean and free of flammable
and corrosive materials such as gasoline and other flammable, explosive and corrosive gases
and liquids, etc.
The power supply of the water heater can only be turned on after the water tank has been filled
with water.
Water temperatures above 50 °C can immediately lead to severe burn or scald and death.
Please feel the water temperature before bathing or showering.

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Prevent the risk of scald by high-temperature water:
In order to prevent scalds caused by excessively high water temperature, we recommend
installing a temperature limiter at the junction of the hot water pipe and the sanitary water outlet
(i.e the toilet and bathroom). This will keep the water temperature at the outlet below 50 °C, which
can reduce the risk of scalds.
Water temperatures above 50 °C can cause severe scalds, and the local regulations and
requirements regarding temperature limits primarily for personal sanitary hot water must be
considered.
The water heaters must be installed by authorized personnel and the installation must comply
with the local laws and regulations and the requirements of the supervision organization.
Faulty operation can result in death or serious injury.
This manual has clearly stated the possible risks. We will not be liable for any consequences
resulting from failure to apply the equipment in accordance with the requirements of this manual.
2. Product description
2.1 Product features
Easy to operate
The equipment adopts the user-friendly control panel, which is easy for users to operate.
Energy saving and environmental protection
The equipment heats water by absorbing energy from the surrounding air and releasing it into the water
stored in the tank, so it is very energy efficient. If the ambient temperature is low, the heating capacity of
the heat pump will decrease, and then the auxiliary electric heater can be used as a backup.
Overheating protection
The water tank is equipped with a thermostat protection device located above the electric heater and it is
in contact with the inner tank surface. If the water temperature reaches preset temperature or there is no
water in the tank due to any cause, the thermostat will automatically cut off the power circuit of the electric
heater.
When the water temperature is higher than 90 °C, the manual protection device of thermostat will cut off
the power supply. If the temperature returns to the normal level later, the thermostat needs to be turned
on by manual reset.
Manual reset of the thermostat should be performed by a qualified service personnel.

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Warnings
The cause of abnormal high water temperature must be investigated by a qualified service
technician and corrective measures must be taken before the water heater is restarted.
Automatic defrosting
In the operating state of heat pump, the equipment will automatically defrost to ensure thermal efficiency.
Water temperature or pressure protection
For your safety, the equipment is equipped with a P/T valve. If the tank pressure reaches 800 kPa or the
temperature reaches 90°C, the valve will automatically open to allow the pressure or temperature to drop
to a safe value.
Water supply pressure
The water heater is designed to be directly connected to the water system. When the water supply
pressure exceeds 800 kPa, a pressure limiting valve must be installed. The minimum water supply
pressure of 200 kPa is required to ensure the normal water supply of the water heater.
If the P/T valve or other safety devices has been tampered or not been installed in accordance with the
instructions in this manual, the company will not be responsible for the consequences.
2.2 Working mode
• AUTO mode:
Water temperature setting: 35~75°C;
The heat pump can be heated up to 65°C at maximum, and it will shut down when the water temperature
is heated to 65°C.
• Eco mode (Energy saving mode)
It is a timing mode.
The heat pump will automatically start and shut down when the startup & shutdown time is pre-set. It can
be heated up to 65°C at maximum, and it will shut down when the water temperature is heated to 65°C.
Note: The default hot water outlet temperature is 55°C.

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2.3 Product appearance
[1] Air inlet
[2] Air outlet
[3] Water tank
[4] Foot
3. Storage, handling, transportation and installation
3.1 Storage and transportation
As a rule, the equipment should be packed erectly and the water tank be stored or transported as an
empty water tank. For short-distance transport, care should be taken to allow a tilt angle of 30° at
maximum. Whether transported or stored, the ambient temperature should be in the range of -20 °C~
+60°C.
3.2 Handling
When handled and transported by a forklift, the equipment must be fixed to the pallet at all times. The
lifting rate should be kept at the lowest limit. Due to the top-heavy weight, anti-overturn measures must
be taken. To prevent any damage, the equipment must be placed on a level surface!

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For handling, it must be noted that the maximum allowable tilt angle cannot exceed 15°. If tilting cannot
be avoided during handling and transportation, the equipment can only be operated one hour after
being moved to the final vertical position.
Warnings
Damage during transportation!
 Avoid tilting the device over 15°.
 Be careful when handling equipment.
 To avoid dropping the equipment and damaging internal components, do not turn the
equipment.
 To avoid equipment damage, the protective packaging shall be removed after the equipment
has been transported to the installation site.
 Use straps to prevent the equipment from being scratched.
 Use the appropriate means of transportation to transport the equipment to the installation
site (special vehicle, pallet truck, etc.)
4. Installation
The manufacturer's warranty does not cover any damage caused by improper installation, connection or
use of any type of accessory (except as listed in this user manual) of this water heater.
The use of unauthorized devices may shorten the life of the water heater and may result in death and
property damage. The manufacturer is not responsible for any loss or damage caused by the use of such
unauthorized devices.
4.1 Placement space requirements
Installation space requirements: to avoid affecting airflow, please ensure the equipment space
requirements as shown.

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Warning
P/T valve coming with the equipment must be installed and the valve outlet must not be blocked,
as this may be dangerous.
4.1.1 Installation location and space requirements
The water heater shall be installed in a clean place that is as close as possible to the area with the
maximum hot water demand. The long non-insulated hot water pipes will waste energy and water.
When the water heater is placed, the space that is used for proper maintenance must be reserved, that
is, the space required for removing the top cover, accessing to the P/T valve, and removing & installing
the anode rod.
The entire water heater may be disassembled for future maintenance, so the water heater and water
pipelines should be protected to prevent damage caused by severe cold and corrosive environments.
In the place where the water heater is installed, there must be sufficient drainage facilities, such as floor
drains, to drain the water in the tank when the tank is repaired or cleaned.