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 Topic: Cascade 2 help please
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10/5/2010 at 10:26pm
Location: None Entered
Outfit: http: www.arcsystems.biz
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This is an old copy but should satisfy the 'engineer' in you?!
The Carver Cascade 2 is a 9 litre storage water heater, which when running on gas will heat the water to 65deg c in about 45 minutes. On 240V mains assuming it has this facility, the time can be somewhat longer or shorter depending on the wattage (630w 3amp to 840w 5amp) of the element fitted, you can use both gas and electric together for faster times.
To operate the gas there is a wall switch or a switch within a main control panel, either way both have three lights green, amber and red. When switched on the green lights, (water tank must be full, i.e. water coming from hot taps), if it stays on after about 8 seconds then the gas has lit and all is well. If the green is joined by the red then you may have a problem, but if the gas bottle has just been changed then air in the pipes will have to be bled through by repeating the above 2 or 3 times. Once lit, and it should light without any pops and bangs, (this would indicate it needs a service), the heater looks after itself and gives constant hot water. Any problems will cause it to shut down safely and show the red light. Forget the amber light, it’s to show low voltage and won’t light unless the voltage is so low the heater and everything else packed up long since, though you may notice it ‘flash’ as the switch is turned on or off.
The 240v emersion heater if fitted is totally separate, and lies behind a white plastic box on the inboard end of the water tank. It is controlled by a switch, often close by and at floor level, but again sometimes as part of a remote control panel. The switch has a red light to show it’s “on”, not that it’s working, this will be determined by the water getting hot. If it does not then it may have “tripped” Two types exist, early circa 1990 are non-re-settable but are repairable. Later models have a Red button on the end of the plastic box which is sometimes behind a little flap. Switch off mains, and press to reset.
Other faults concerning the gas side very often come down to the “Burner Module”. This handy little unit contains the burner, gas valve and all the electronics which control it and is accessible from behind the cover outside of the van. In the event things go wrong it’s a 5 minute job to replace it, with a new or serviced exchange unit. One other safety device is a wax filled ‘fusible’ plug, this again is behind the outer cover and shows itself as a 13 mm nut set in the fins above the burner. The wax will melt if things get too hot allowing hot water from the tank to spray over the burner and put the flame out. This will render things safe but will require a new module because it’s control circuitry is faulty. However given if the fuse 'blows' without the water apparently getting to hot then replacing the plug will be sufficient. The point to note here is that over time the wax in the plug degrades or the threads leak, at the very least allowing water to seep onto the burner causing it to rust and eventually will still require replacement of the whole burner module.
Further problems that come to light in spring is the discovery of frost damage to the water tank, the non-return valve which is part of the cold water inlet and other plastic fittings. Failing to drain the heater when there is a chance of temperatures dropping below freezing can be very expensive to repair and should be avoided by removing the drain bung and allowing the heater to drain completely. Later models have a valve above the drain hole in the top left corner of the flue cowl, these have a ‘toggle’ showing that when turned a ¼ in any direction will allow air into the tank and assist the draining. Older models still have the valve but the flue cowl needs to be removed and the valve end pulled to open it, in this case opening all taps in the van will do much the same thing. It is most important that the drain bung is then only placed back into the hole and not screwed in, any water left in the system can then drain away.
Frost damage to the tank will be obvious by the leaking water from the damaged seal, the damaged non-return valve quite often will prevent water coming from the hot taps although the cold water flow will be fine. Other fittings are often cracked by the pressure of the frozen water and will leak on refilling the system.
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11/5/2010 at 8:44am
Location: Gloucestershire
Outfit: Ford Focus Zetec and Avondale Dart 470
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O such a useful, spelling it out simply put post Gary I don't need to know from a professional engineer like Steve, interested in how it works, but just because in my case the instruction books are not very clear to me. We don't use ours to full potential as we are not sure about the blown air heating. We have the on/off and temperature control knobs on the side of the wardrobe (where the warning light shows on gas) and the acutal heater has on the top 2 circular knobs one controlling the electric and one the gas with as well. Then there are two on off switches on the boarding under the bunk which have a red indicator,is this what this refers to?
The 240v emersion heater if fitted is totally separate, and lies behind a white plastic box on the inboard end of the water tank. It is controlled by a switch, often close by and at floor level, but again sometimes as part of a remote control panel. The switch has a red light to show it’s “on”, not that it’s working, this will be determined by the water getting hot.
OH says he thinks it is and when we switch the one down we do get hot water but I am not too sure about the other and we as yet have not used it. One day we will not be the novices and will be able to help other newbies, One day!
Carol
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