Cavagna DUO Automatic
Changeover Switch Gas Regulator Bulkhead 30mBar for Motorhomes
Changeover switch with regulator for use with red vapour tanks, alu bottles and LPGSHOP composite refillable cylinders.
It is two stage regulator for better pressure stability, mandatory for mobile units. Second stage ensures that gas is evenly evaporated and no liquid gas is let into the system.
The connectors on inlet side are M20 1.5 parallel thread, also know as W20 - it is caravaning standard.
The outlet is 8mm copper pipe compression fitting.
Outlet pressure is 30mBar which is suitable for most appliances designed for motorhomes.
It comes with a bracket to secure regulator to bulkhead. Inlet should be positioned upwards and higher than outlet of the bottle
The automatic changeover ensures continuous gas flow, automatically changing the gas withdrawal from the empty “service” cylinder to the full “reserve” one. The full-empty indicator incorporated into the bonnet of the automatic changeover indicates the exhaustion status of the “service” cylinder. The indicator color changes from green to red, when the “service” cylinder is exhausted. The rotation of the automatic changeover handle to the full “reserve” cylinder restores the green color on the indicator.
Start up - Turn two cylinders’ gas valves on at the same time. This is fundamental, which ensures the automatic changeover the ability to continuously supply the gas appliance, in case the service cylinder becomes empty. The automatic changeover cannot turn to the reserve gas bottle if its valve is closed.
Reading the automatic changeover’s indicator: when the service gas bottle is full - When the two gas cylinders are full, the automatic changeover’s indicator turns to green while opening gas valves A and B. - The arrow on the automatic changeover’s knob indicates which one of the two gas cylinders is supplying gas: that is to say the “service gas bottle”. The other cylinder is the “reserve gas bottle”.
Reading the automatic changeover’s indicator: when the service gas bottle is empty - When the service bottle is getting exhausted and reaches pressure values of inversion (lower than 10 PSIG), the automatic changeover turns automatically to the “reserve gas bottle” and the gas appliance continues working. In this case the automatic changeover’s indicator turns to red: the end user gets to know that the “service gas bottle” is empty: it is not supplying gas any more.
Substituting the empty gas bottle
- Close the valve of the service gas bottle A and turn the automatic changeover’s knob 180° (see figure 3 a). If the reserve gas bottle is full and its valve is open, the automatic changeover’s indicator turns to green (figure 3 b).
- Remove the empty gas bottle (figure 3c).
- Position a new full gas bottle. Open the gas valve A (figure 3d).
TYPE 924N INTEGRAL TWO STAGE AUTOMATIC CHANGEOVER COMPLIANT WITH STANDARD EN16129 ANNEX-D
For use with caravans, motorhomes or freshwater boats
For liquefied petroleum gas LPG
This product is covered by the manufacturer's general warranty conditions, available in the General Warranty Conditions section of the www.cavagnaoroup.com website.
- Gas leaks may cause fatal fires or explosions
- Only skilled persons must work on gas circuits
- Inspect the gas circuit regularly
- Replace adapters, valves and regulators as recommended by the relevant technical regulations
- Failure to follow these instructions with care could lead to serious health risks
The manufacturer reserves the right to modify this instruction sheet without notice.
THE MANUFACTURER GUARANTEES THAT THiS REGULATOR COMPLIES WITH THE REGULATIONS AND STANDARDS REFERRED TO ABOVE. IT IS THEREFORE THE INSTALLER'S RESPONSIBILITY TO COMPLY WITH THE REGULATIONS IN FORCE IN THE REGULATOR'S COUNTRY OF USE AND CHECK ANY SPECIFIC DIRECTIVES COVERING ITS APPLICATION. FAILURE TO COMPLY WITH THE INSTRUCTIONS PROVIDED HERE LEADS TO AUTOMATIC FORFEITURE OF THE MANUFACTURER'S WARRANTY ON THE PRODUCT. AND THE MANUFACTURER SHALL NOT BE HELD RESPONSIBLE FOR ANY CONSEQUENT DAMAGE
Operating instructions to be kept by the user
Read carefully before using
- Input pressure (p): 0,7-16 bar
- Outlet pressure (pd): 30 mbar
- Guaranteed output (Mg): 1,5 kg/h
- Inlet connection: G.13 - G.14 - G.18 - G.23 of EN16129
- Outlet connection. H.7 - H.9 - H.11 - H.19 of EN16129
- Type of gas: LPG
- Note: the marking AP5 marked on the label is the value of maximum downstream admissible pressure loss downstream and shall not be exceeded.
- This regulating device is not suitable for seawater boats
- For possible usage in caravan holiday homes national regulation shall be respected.
1 INSTALLATION AND OPERATING INSTRUCTIONS
The regulator Type 924N has been specifically designed for supplying gas to the gas installation in a caravan or a motorhome or a freshwater boat in compliance with the prescriptions of the EN 16129 Standard, Annex D.
- Make sure the regulator inlet (3) and outlet (2) are compatible with the cylinder and the appliance being used.
- The gas cylinder must always be kept in a vertical position. Do not move the cylinder during the operation. When the device is used outdoors, it shall be positioned or protected against direct penetration by any tracking water.
- TYPE 924N operating temperature range is -201+50°C for LPG.
- Never look for gas leaks with a live flame. Use instead a solution of water and soap.
- In the event of any faults being found, close the gas supply and immediately contact your gas supplier.
- Avoid that the hole on the cover (VENT) is obstructed or stopped.
- For a permanent use outside the house, install the regulator in a position protected from the weather, paying great attention to the position of the vent hole.
- TYPE 924N versions featuring a relief valve (the marking "PRV' is visible on the label) are generally not type-approved for use in dosed premises (see local laws on the subject).
An over-pressure relief valve is a safety device which vents gas to the atmosphere when the gas pressure reaches a set pressure. It doses when the pressure is reduced to below the set pressure. This valve is dosed during normal operation.
Until the time of installation, the product must be stored in a dean, dry location protected from weather, atmospheric agents and direct sunlight. It must not be knocked or dented in anyway. Before installation, inspect the product for damage and dirt. Damaged products must not be installed.
The pressure regulator must be mounted on a wall and protected from the elements, using the mounting plate designed for this purpose (1).
It can operate in any position; however, in order to prevent it from being damaged by the introduction of harmful products from the gas or from the hoses, it is strongly recommended to install the regulator with the outlet (2) facing downwards and positioned as far above the tap of the cylinder as possible. The pressure regulator is connected by means of the special output connection (2) (compression fitting) to the rigid gas system pipe (steel pipe, diameter 8mm or 10mm). The inlets (3) of the pressure regulator are connected by means of two high-pressure hoses complying with the specifications of Standard EN 1949 or with the legislation in force in the countries of use.
3 CHANGEOVER UNIT OPERATION
Putting into Service figure 1
After having checked that the indicator remains green in the two positions on the knob, turn the knob so that the arrow is facing to the right or left. The arrow on the knob will indicate the cylinder in use (Service). Operation of the Reserve cylinders, figure 2. When the indicator is red, this means that the cylinder in Service has run out. It is now empty and the installation is operating on the Reserve cylinder.
Replacing the empty cylinder figure 3
Turn the knob fully to point at the Reserve cylinder. This cylinder that was previously in Reserve will now become the cylinder in Service, the indicator will turn green. If it stays red, this means that the system has been operating on the Reserve cylinder for too long and that this one is also empty. It will therefore be necessary to change both cylinders.
Close the valve on the empty cylinder. Disconnect the cylinder.
Connect a new full cylinder, AND FIRMLY TIGHTEN THE POL NUT USING A CORRECT FITTING SPANNER (left hand thread). Open the cylinder valve and check the connections for leaks using a Leak Detector fluid or a soapy water solution. Aleak will show bubbles being continuously formed.
4 GAS LEAKS
All gas leaks, however small, are dangerous and must be eliminated. Escaping gas can normally be traced by smell or sound but liquid detergent should be brushed over the area to confirm the location of the leak. NEVER look for a leak with a naked flame. On cylinders, if a leak is suspected, turn off gas supply immediately, and estinguish any standing pilot lights or naked flames. Ventilate the room if possible. If the cylinder is indoors, move the cylinder outdoors to a safe place, and call your dealer for advice.
Do not attempt to repair the Automatic Changeover Device yourself, as there are no user serviceable parts in its construction. Hoses should be checked annually. If hoses show any signs of cracking or deterioration they should be changed. It is recommended that all hoses are changed 5 years from installation. In normal conditions of use, in order to ensure the correct operation of the installation, it is recommended that this regulator is changed within 10 years of the date of manufacture (4). 10 years is a recommendation which may be replaced by national rules or code of practice.
IMPORTANT: Never leave the regulator connected to the cylinder valve when the rubber hose is not correctly fitted in its housing as the flow limiting device has not been designed to guarantee the gas supply shut off function. The product must never be tampered with or dismantled; any such procedures lead to forfeiture of warranty cover on the product and the manufacturer declines all consequent responsibility.
6 RECOMMENDATIONS FOR THE FINAL CUSTOMER
Gas leaks may cause fires and explosions. If a smell of gas is noticed:
- Do not use electrical devices or the telephone
- Do not switch on household appliances
- Call your supplier from a neighbour's telephone at once
- If you are unable to contact your supplier, call the fire service.
CAVAGNA GROUP SPA - LPG & natural gas regulators RECA division Via Matteotti, 5 - 25012 Viadana di Calvisano Brescia ITALY firstname.lastname@example.org - www.cavagnagroup.com Tel: +39 030 9688611 — Fax: +39 030 9968712