#96144  by Mark
 Thu Jul 09, 2015 8:40 am
Just resurrecting the original question: still not resolved.
When they turn the water tap on the califont lights up with a large array of blue flames.
After a few seconds (between 5 and maybe 30) the flames go out.

I wondered if the water pressure was not sufficient to keep the flow up to the required rate once the pressure reservoir was exhausted and it was then relying on the actual pump for water flow.

Any ideas would be greatly appreciated, as the family is now living in the motorhome awaiting the completion of their house.
 #96145  by Paul
 Thu Jul 09, 2015 10:22 am
Hi My thoughts. Is there a flame fail device in the Califont ? Paul
 #96146  by Mark
 Thu Jul 09, 2015 10:23 am
Yes, there is :)
 #96355  by MikeBravo
 Wed Jul 15, 2015 11:16 am
These horrible things rely on there being sufficient water flow to reduce the pressure in the system enough to allow the gas valve to open. If the water flow is insufficent the pressure will build up and the gas valve will close. The idea that it's the water flow that directly triggers the gas flow is a myth — the water flow causes the pressure reduction in the system that does the trick.

The commonest cause of this is reducing the water flow in an attempt to get a higher temperature out of the thing. All califonts heat through a certain temperature range, not to a fixed temperature, so if the incoming water is cold, the outgoing water is only warm. Reducing the flow rate means that the water is in the gadget longer, and therefore gets hotter — as long as the gas continues to burn! Some (most?) califonts have a water flow control, often disguised as a temperature control, and setting this to minimum flow (i.e., maximum temperature) will often cause the problem you report. Turning a hot tap only partly on can do the same thing.

A less common cause of intermittent gas flow is having the pump pressure set too high, so that at a normal-ish sort of hot water flow, there is still too high a pressure in the system.

In cold weather, you will never get the sort of hot water temperature and flow from a van califont that you would expect in a house. The best cure for the problem is to throw the damned thing away and fit a gas-fired cylinder. You won't have unlimited tepid water, but you will have 10 litres of seriously HOT water. It takes about half an hour from cold to heat our Truma up.
Last edited by MikeBravo on Wed Jul 15, 2015 11:22 am, edited 1 time in total.
 #96358  by Mark
 Wed Jul 15, 2015 11:22 am
Thanks Mike. Will alert them to your reply.
 #96405  by Mark S.
 Thu Jul 16, 2015 2:34 pm
Don't throw Junkers away as best califont built. If there is a decent gas guy where you live should be simple. Calypsos need water reducing to work, however will only lift temp 25 - 30 on temp in tank. Reg greaves used to do a mod in old days where califont worked in winter and I am pretty sure it was a reducer fitted. Califont in Paeroas RV park had his mod on it once.
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