Kranzle Operating Manual

Description of Appliance

The appliance is a high-pressure cleaner with a sturdy chassis, designed for mobility.

Key Components:

• 1. Water inlet connection with filter
• 2. Power cable
• 3. Winder for cable
• 4. Suction hose for detergent
• 5. Hose drum (option)
• 6. Spray gun
• 7. Spray pipe attachment
• 8. Storage bin for spray gun and pipe
• 9. Brake
• 10. Storage bin for accessories
• 11. Fuel tank
• 12. Filler aperture for fuel
• 13. High pressure outlet
• 14. Fuel drainage screw

Control Panel Indicators:

• Master switch (appliance ON-OFF)
• Heating switch (burner ON/OFF)
• Pressure gauge - water pressure
• Digital thermostat for adjusting water temperature
• Pressure gauge - fuel

Technical Data

The following table details the specifications for various Kranzle therm models:

Permissible tolerance for figures ± 5 % in accordance with VDMA uniform sheet 24411.

Overview: What You Have Purchased

The package typically includes:

For therm-1 models:

• Kranzle high-pressure cleaner (with or without hose drum and 20m/10m steel-weave high-pressure hose NW 8)
• Safety spray gun with insulated handle and screw connection
• Lance with flat-jet nozzle
• Holding devices for cable with screws
• Water intake filter
• Operating manual + Spare parts list

For therm RP models:

• Kranzle high-pressure cleaner (with or without hose drum and 20m/10m steel-weave high-pressure hose NW 8)
• Trigger gun with safety catch Starlet, short design with quick release coupling
• Stainless steel lance 1100 mm with flat jet nozzle and quick release coupling
• Holding devices for cable with screws
• Water intake filter
• Operating manual + Spare parts list

General Rules

Range of Application

This machine is intended for cleaning facades, vehicles, containers, pavement slabs, stables, machines, and similar objects.

Inspections

The machine requires inspection by a qualified person at least every 12 months according to the "Guidelines for Liquid Spray Devices" to ensure safe operation. Inspection results must be recorded in writing. Commercial use requires annual checks.

Accident Prevention

The machine is designed to prevent accidents when used according to instructions. Read all safety notes carefully before use. Operating staff must be instructed according to this manual and the "Guidelines for Liquid Spray Devices" must be followed.

Setting up - Location

Do not operate in rooms with fire or explosion risk, nor in puddles, nor underwater. Ensure adequate ventilation and safe exhaust of combustion gases. Never block or reach into the exhaust outlet.

Safety Notes

• Do not jam the trigger during operation.
• Disconnect power before servicing.
• Never operate with defective cables or safety-relevant parts.

Safety Notes

General safety precautions:

• Never operate without supervision.
• Only operated by instructed persons.
• Metal parts of gun and lance can be hot during hot water operation; keep covers closed and avoid touching metal parts.
• Wear appropriate protective clothing (waterproof clothing, rubber boots, safety goggles, headwear).
• Avoid use near persons without suitable protective clothing.
• High noise levels may require ear protection.
• Do not spray asbestos or hazardous substances.
• Use only light heating oil EL (DIN 51 603) or diesel (DIN EN 590). Other fuels may be hazardous.
• Switch the main switch to "0" after use.
• Be aware of significant recoil at the lance.
• Apply the spray gun safety catch after each use.
• Aim underbody lance carefully; be aware of torque in recoil.

Prohibited Actions:

• Never direct the high-pressure water jet at yourself, others, or animals.
• Use only power cables in perfect working order; do not damage or repair them incorrectly.
• Never pull the high-pressure hose if kinked or over sharp edges.
• Never allow children to use the cleaner.
• Never direct the water jet at the machine itself or place it within the spray mist.
• Never direct the water jet at a power socket.

Important Notes

Lack of Water

Insufficient water can cause pump cavitation and damage. Check water quantity by filling a bucket for 30 seconds. If the quantity is too low, use a different water connection. Lack of water can lead to accelerated wear of joints (no guarantee).

Connection to Water Supply

Follow local waterworks regulations. Direct connection to public drinking water lines is not permitted without specific safety devices (e.g., tube ventilator with check valve). Indirect connection via free emission (e.g., reservoir with float valve) is permissible. Direct connection to non-drinking water lines is allowed.

Insufficient Quantity of Electricity

Overloaded networks can reduce voltage and current, preventing the motor from starting or causing it to blow. Long or thin power cables, or extension cables, can cause voltage drops and malfunctions. Ensure proper line fusing and adequate current intensity, consulting an expert if necessary.

Electrical Connection

Use a grounded socket with a 30 mA residual current device. The socket must be protected by a 16A (or 32A for therm RP) delay action fuse. Extension cables must have an earthed lead and appropriate cross-section (min. 1.5 mm², or 2.5 mm² for therm RP). Plug connections must be spray-proof and not on wet floors. Keep cable drums wound when in use.

Kranzle Technology

Water and Cleaning System

Water is fed under pressure (0.2-0.8 MPa) to the storage tank, regulated by a float valve. The high-pressure pump then draws water from the tank, forces it through the heat exchanger, and out via the spray lance nozzle. Environmental, refuse disposal, and water protection regulations must be observed.

Lance with Trigger Gun

Operation requires squeezing the safety trigger. Releasing the trigger stops the spray and the motor. Actuating the gun again restarts the pump and motor. The pressure control valve/safety valve manages pressure and protects the machine. The trigger gun is a safety device; repairs must be done by qualified personnel using authorized parts.

Total Stop System

The machine features a Total-Stop-System. If the gun is closed for over 20 seconds, the machine switches off automatically. After 20 minutes, it enters a safety shutdown mode requiring a manual restart. The machine restarts automatically when the gun is operated, provided the master switch is on.

High Pressure Hose and Spraying Device

These components are made of high-grade material and optimized for the machine. Only use manufacturer-authorized replacement parts. Ensure pressure-tight connections. Avoid driving over, excessively pulling, twisting, or pulling the hose over sharp edges, as this voids the guarantee. Hoses are wearing parts; fabrication defects are covered, but external damage is not. Defective hoses must be replaced, not repaired.

Pressure Control Valve - Safety Valve

The pressure control valve allows adjustment of water quantity and pressure. The safety valve prevents excessive pressure and cannot be adjusted beyond the operating limit. Setting nuts are sealed.

Replacements, repairs, and adjustments must only be performed by trained personnel.

Motor Protection Switch

The pump motor is protected by a switch that cuts out the motor in case of overload. To restart, switch the main switch off and then on again. Frequent tripping indicates a malfunction that needs to be located and rectified.

Replacements and inspection work require disconnection from the power supply.

Thermostat

The thermostat controls spray water temperature. It monitors fuel level and switches off the burner if the level is too low (indicated by "OIL" flashing). "FLA" indicates a burning malfunction.

Operating Modes:

• Temperature Mode: Activated by the "°C" button. The red LED lights up. The desired temperature is set using +/- buttons and displayed. Adjustments can be made in 5°C increments. The last set value is saved. The current spray temperature is shown on the bottom display.
• Percentage Mode: Activated by the "%" button. The yellow LED lights up. The user specifies the heater's switching duration in percent (0-100%). The "Actual" temperature display is used to check if the desired temperature is reached. Increasing the percentage adjusts the temperature. This mode maintains a constant temperature within a narrow range. The last value set is saved.

Operating Hour Meter

The cleaner has an operating hour meter. Momentarily pressing the "°C" or "%" button for over 2 seconds displays pump operating time and combustion time. The hours are displayed in "TARGET" or "ACTUAL" windows.

Heat Exchanger

Water is forced through a 38m heating coil (5L capacity, max. 90kW heating capacity). Fuel is pumped to the injector nozzle. A fan draws in fresh air, pre-heating it and cooling the outer mantle. This pre-heated air mixes with atomized fuel, ignited by electrodes. The flame burns downwards, heating the coil. Burned gases exit via the chimney.

Components:

• 1. Exhaust vent
• 2. Mixing unit and nozzle
• 3. Electrodes
• 4. Inner cladding
• 5. Outer cladding
• 6. Fuel filter
• 7. Fuel pump
• 8. Heating coil
• 9. Fan

Commissioning

Follow these steps before initial operation:

1. Install holding devices for the power cable.
2. Install the water inlet filter.
3. Fill the fuel tank with light heating oil EL (DIN 51 603) or diesel fuel (max. 25 litres).
4. Check the water inlet filter for cleanliness. Unscrew the glass body and inspect the metal sieve.
5. Check the oil level. If low, add oil to the marking on the dipstick. Change oil if it appears grey or whitish. Dispose of responsibly.
6. Release the fixing brake.

Usage as a Cold Water High-Pressure Cleaner

1. Set the ignition switch to "OFF".
2. Ensure the detergent valve is closed (turn knob to extreme right position "close").
3. Switch on the main switch with the spray gun disengaged. Vent the cleaner by pulling and releasing the spray gun trigger several times.
4. When starting cleaning, do not aim the water jet at the object for at least 30 seconds, as the water inside the combustion chamber may have changed color.
5. Push the HP hose onto the gun.
6. Screw the HP hose and gun together tightly. Ensure all screw connections are pressure-tight to prevent leaks, which can cause increased wear or malfunction of the delayed motor cut-out.
7. Move the machine to the job site.
8. Steering: Tilt the machine using a foot on the footrest and pull the handle to change direction.
9. Connect to water mains (0.2-0.8 MPa, 2-8 bar pre-pressure) with a hose of at least 1/2" inner diameter. The water storage tank fills automatically, and the float valve shuts off intake when full.
10. Connect to the power circuit with the main switch OFF. Ensure the socket is protected by an appropriate fuse.
11. Release the fixation of the hose drum.
12. Unwind the HP hose without kinks or nooses. Open the gun before reeling/unreeling to bleed pressure.

Usage as a Hot Water High-Pressure Cleaner

Follow the same steps as for cold water operation, then:

1. Set the desired temperature on the thermostat (minimum 40 °C).
2. Engage the fixing brake before starting cleaning.
3. Switch on the main switch with the spray gun disengaged. Vent the cleaner. Ensure the detergent valve is closed.
4. Start ignition. The water heats up and is kept at the set temperature.
5. Start cleaning.

During high-pressure operation (above 30 bars), the temperature may not exceed 90 °C.

Steam Level (90 °C - 150 °C)

During steam operation, pressure must not exceed 30 bar.

To reach the steam level (above 90 °C), adjust pressure below 30 bar and set the thermostat to the desired temperature up to 150 °C. For machines with hose drums, the high-pressure hose must always be unwound completely.

Suction of Detergents

Kranzle therm cleaners can directly suck detergent into the pump, reducing output loss and increasing efficiency without reducing working pressure. This is more efficient than pressure-side injection systems.

1. Place the detergent filter into the detergent container.
2. Dose detergent by turning the detergent valve.
3. Closing the detergent valve stops the supply.
4. After using detergents, rinse the appliance with the spray gun open and clear water for at least 2 minutes.

Only open the dosing valve if the detergent sieve is in liquid. Sucked air can destroy pump seals (no guarantee).

Keep detergent pH value neutral (7-9). Observe detergent manufacturer's specifications for protective equipment and wastewater treatment.

Never suck in liquids containing solvents (varnish solvents, petrol, oil, etc.). Seals are not resistant to solvents. Solvent mist is highly flammable, explosive, and poisonous.

Decommissioning - Frost Protection

To protect the machine from frost:

1. Switch off the machine (main switch to "0").
2. Cut off water supply.
3. Open spray gun briefly to release pressure.
4. Apply the spray gun safety catch.
5. Remove water hose and spray gun.
6. Drain the pump by switching the motor on for approx. 20 seconds.
7. Pull the plug from the socket.
8. Clean HP hose and wind it up; fix the drum.
9. Clean power cable and wind it up.
10. Clean the water filter.

Frost Protection Procedure:

The machine normally retains some water. To fully empty it, disconnect from water supply, switch off ignition, switch on master switch, and open the gun. The pump will expel remaining water. Do not run the machine without water for longer than one minute.

For extended periods of frost, pump antifreeze into the machine: fill the water tank with antifreeze, switch on the machine without ignition, and wait with the gun open until the agent exits the nozzle.

The best protection is to store the machine in a frost-free location.

Care and Maintenance

Disconnect the machine from the power supply before performing any servicing. Ensure the main switch is OFF and the plug is removed.

Weekly, or after approx. 40 hours of operation:

• Check the high-pressure pump oil level. Add oil if low. Change oil if it appears grey or whitish. Dispose of used oil responsibly.
• Check the water filter (in front of the float valve) and the fuel filter (in front of the solenoid valve). Clean if necessary.

Yearly, or after approx. 500 hours of operation:

• Desulphurize and decarbonize the heating coil.
• Check heating coil for calcification; decalcify if necessary.
• Check the oil burner and ignition system.
• Clean the oil nozzle, oil filter, solenoid valve, and filter. Clean and adjust the ignition transformer, ignition cable, and electrodes. Replace defective parts.
• Change the oil.

Oil leakage: Contact customer service immediately. Environmental damages, transmission damages, or loss of guarantee may result.

Increased humidity or temperature fluctuations can cause condensed water. If the oil turns grey, it must be changed.

Changing the Oil

First oil change after approx. 50 operating hours. Thereafter, change oil every 500 operating hours or yearly.

1. Take out the oil drainage hose.
2. Open the red oil filler plug on the black oil housing.
3. Open the hose cap, drain oil into a pan, and dispose of it responsibly.
4. Close the hose end and refill with new oil.

Oil quantities:

• therm 635-1 / 875-1: 0.5 l - 10 W 60
• therm 895-1 / 1525-1: 1.0 l - 10 W 60
• therm 1000 RP - 1400 RP: 0.8 l - 10 W 60

Decalcifying the Heating Coil

Calcification increases energy use and causes excess pressure. It is indicated by increased pipeline resistance. If pressure exceeds 25 bar without the high-pressure lance connected, decalcification is needed.

Procedure:

1. Unscrew the high-pressure hose and decalcify it separately.
2. Place the detergent suction hose into a decalcifying solution container.
3. Set the dispenser valve to maximum concentration.
4. Switch on the machine.
5. Hold the gun in a separate container and press the trigger.
6. Wait for the decalcifier to exit the gun (approx. 1 minute).
7. Switch off the machine and let the solution act for 15-20 minutes.
8. Switch the machine back on and rinse with clear water for 2 minutes.
9. Check pipeline resistance. Repeat if pressure is still above 25 bar.

Decalcifiers are caustic! Wear protective clothing (gloves, mask) to prevent contact with skin, eyes, and clothing.

Fuel System

Check the fuel filter regularly for impurities and clean if necessary. Check the fuel tank for impurities and clean when needed. Empty the tank using the drainage screw, clean tank and fuel pipes, and screw the drainage screw back in.

Detergent and dirty fuel must be disposed of responsibly.

Adjusting Ignition Electrodes

Ignition electrode settings should be checked regularly (at least every 500 operating hours) for smooth ignition.

Particular Rules, Directives and Inspections

Inspections Performed by Kranzle:

• Measurement of earth line resistance.
• Measurement of voltage and current.
• Inspection of tension consistency.
• Pressure check of heating coil at 300 bar.
• Visual and functional check as per inspection sheet.
• Exhaust fume analysis.

Guidelines for Liquid Sprayers

The machine conforms to "Guidelines for Liquid Sprayers" and requires inspection by qualified personnel at least annually. Inspections must be recorded.

Pressure Container and Steam Boiler Directives

Kranzle high-pressure cleaning equipment conforms to these directives. No special approval is required as water capacity is less than 10L.

Duties of Owner

The owner must ensure all safety-relevant components are in serviceable condition before use (e.g., safety valves, hoses, cables).

Emission Control Legislation

For stationary installations, emission levels must be checked annually by a qualified organization. The first inspection is due four weeks after commissioning. The owner is responsible for this inspection.

Pipeline Plan

A diagram illustrates the flow of water, detergent, and fuel through the system, including components like the float valve, water tank, control valve, high-pressure pump, flow-safety-block, fuel pump, and fuel tank. The safety valve (item 5) should be set approximately 15% higher than the unloader valve on the HP pump.

Circuit Diagrams

The manual includes circuit diagrams for both 400V and 230V, 50Hz models, detailing electrical connections for the motor, pump, heating system, burner, and control panel components.

Troubleshooting

This section provides guidance on diagnosing and resolving common malfunctions:

Water Supply Issues:

• Water tank runs over / does not fill completely: Check float valve (dirty/defective), water filter.
• Pump does not suck: Check valves (sticking/dirty), suction hose (leaks), chemistry valve (open/leaking), or clogged high-pressure nozzle. Test water inlet directly.

High-Pressure Pump Issues:

• Loud noises / pressure not reached: Check suction connections, nozzle, valves, O-rings, sleeves, manometer, unloader seat/ball, control piston seals. Pump may suck air.
• Water drops from pump: Replace sleeves or O-rings.
• Oil drops from transmission: Check oil seals, plunger/guides. Water deficiency or air suction can damage seals.
• Pressure too low: Worn nozzle, dirty unloader parts, defective manometer.
• Machine does not switch off: Check return body/O-ring in unloader valve housing. Test pressure switch.
• Appliance does not start or stops during operation: Check electricity supply, main switch, cable connections, board, pressure switch, or overcurrent release.

Displayed Malfunctions:

• ERR (OFF): Water temperature above 147°C. Operate without heating until cooled. Reset via main switch.
• E7: Appliance not operated for >20 min (safety cut-off). Reset via main switch.
• E2: Defective temperature sensor. Replace sensor.
• FLA (E8): Warning - no combustion detected by flame sensor. Check flame sensor, combustion system, and reset via main switch.
• OIL: Low fuel level. Refill fuel.
• UES (Actual value): Motor overload protection activated. Check energy supply, extension cord, nozzle. Reset via master switch.

Excess Temperature Release:

An excess temperature sensor in the chimney triggers if the temperature exceeds 260°C, cutting out the appliance to prevent heating coil destruction. The display is on the back of the switchbox. RED indicates release; YELLOW indicates cooled down and ready for reset.

ATTENTION!!! Immediately contact service in case of recurrence.

Hot Water Mode Troubleshooting

If the fuel manometer shows no pressure, check fuel level, fuse for motor, fuel sieve/filter, fuel pump operation, or ventilator jamming. The thermostat controls the burner. Fuses protect the motor and ignition transformer. A flow monitoring device prevents fuel injection if water is not flowing.

Heating (Burner) Malfunctions:

• Burner does not heat: Check set temperature, fuel level, fuel filter, fuel nozzle, coupling between burner motor and fuel pump, or blower/fuel pump motor.
• Pump/blower does not operate: Check electrical equipment, fuses, coupling, or motor.
• Fuel operating pressure not reached: Check fuel tank for water, dirt, or rust. Clean fuel pump, nozzle, or supply line. Check solenoid valve.
• Smoke during operation/after switching off: Check fuel quality, nozzle/nozzle stock, or ignition cable/transformer.
• Ignition does not function: Check ignition cable, charring of contacts, cable breaks, transformer, or ignition electrode setting.
• Ventilator does not operate: Check blower/fuel pump motor, fuses, or coupling.

Leakage:

Gun or high-pressure hose drips. Clean nozzle, replace seals or O-rings.

Manometer shows pressure but no water:

Pump sucks air. Check hose clips.

Sucking Detergent:

Detergent is not sucked. Test water inlet; no water should come from the detergent hose.

Small Repairs

No water from nozzle, gauge shows full pressure:

Likely a blocked nozzle. Procedure: Switch off cleaner, pull plug, release pressure, unscrew gun/lance, rinse hose. Check water inlet filter. Push wire through nozzle opening. If unsuccessful, dismantle or replace nozzle.

Gauge shows full pressure, gun closed (pressure switch valve constantly switching):

Possible cause: Leakage in pump, HP hose, or lance. Procedure: Check all connections and O-rings for tightness. Replace damaged O-rings. No guarantee for consequential damages from leakage.

Low pressure, water squirting, hose vibrating:

Likely soiled or defective non-return valves. Procedure: Unscrew pump outlet (therm RP: unscrew HP hose first, then screw connection). Remove back pressure ball and seal seat; check for dirt/damage. Exchange check valve if necessary. For therm-1, clean valves and seating under running water. For therm RP, take out valve body and O-ring; check O-ring for damage and replace if needed. Do not forget O-rings during reassembly.

Inspection Report for HP Cleaners

This section provides forms for annual Labour Safety Inspections (UVV) according to Guidelines for Liquid Spray Equipment. It includes sections for scope of inspection, inspection data (determining values vs. set values), and inspection results. It details checks for type plate, manual, protective covering, pressure line, gauge, float valve, spraying device, hoses, safety valve, pressure reservoir, fuel lines, solenoid valve, thermostat, flow controller, power cable/plug, protective conductor, emergency off switch, on/off switch, water quantity safety device, and chemicals used/allowed.

The report also includes fields for operating pressure, cutting-off pressure, smoke spot number, CO2 value, efficiency rating, conductor resistance, insulation, leakage current, and gun lock status.

The inspection result indicates whether the appliance passed safety checks and if defects were rectified. It also notes the date for the next retest.

EG Declaration of Conformity

Josef Kränzle GmbH & Co. KG declares that the design of the high-pressure cleaners (therm 635-1 to 1400 RP) conforms to machinery directive 2006/42/EEC, EMV-directive 2004/108/EEC, and noise directive 2005/88/EC. Measured and guaranteed sound power levels are provided (89 dB(A) measured, 91 dB(A) guaranteed). Applicable standards include EN 60335-2-79, EN 55014-1, EN 61000-3-2, and EN 61000-3-3.

Warranty

The warranty obligation covers material and manufacturing defects. Normal wear and tear from long/frequent use (e.g., pressure gauge, nozzle, valves, hoses) is not covered. The product must be operated according to the manual. Modifications to safety devices or maloperation (exceeding limits, undervoltage, insufficient water/sewage, improper use) can cause damage not considered material defects. Using non-original parts voids warranty claims. Contact your local dealer or visit www.kraenzle.com for warranty claims.

Inspection Sheet

This section contains a detailed inspection sheet for Kranzle therm models, covering various checks such as line connections, hose clamps, screws, ignition cable, brake function, leak tests, water tank, water inlet, float valve, machine tightness under pressure, electrical checks (earth line, current intake), operating pressure, and switch-off pressure. It also includes checks for steam phase, chemical valve, start/stop functions, fuel shortage switch, thermostat, and burner function. Specific readings for water inlet/outlet temperature, fuel pressure, and measured smoke spot number are to be recorded. The sheet also has a section for safety equipment sealing and confirmation of compliance with requirements.