Whale pump

[Smurff]

Hi guys, just wondered if you all had the same prob as me, and if there's a solution ( no not the wife) when you remove the pump from aqua roll to top up then replace it you get an air lock ( or at least I do) so when you run the taps again you get a splutter of water n air for the first min or so,

 

[RogerL]

I've never found it necessary to disconnect the hose when filling up - just take the hose/pump out of the water container, put it in the fitting thoughtfully provided by Whale on the housing to stop it touching the ground (missing on the current Truma's) and then just put the hose/pump back in the container when filled.
The pumps have (or should have) and air-release valve on their top surface to allow air to escape from the pump itself - and then use as normal.
Both the Truma Ultrastore water heater and the Alde water heater section are designed to have a small amount of air in their uppermost part to minimise surging - in addition to any surge damper fitted - I can't remember what the Carver Cascades did.

If you're getting a noticeable amount of air out of the taps then the air release valve on the pump may not be working.

 

[RayS]

If you have the newer high flow pump with an electronic module on the back of the sockry then this seems to need resetting sometimes in these circumstances.I'm thinkink of making a filler tube with a funnel head on top so I can refill Aquaroll from other contaners withoutout having to remove pump. These high flow pumps give an excellent shower but really get trough the water

 

[Danddandy]

Regarding the later pistol style Truma water connection, there is a facility to keep the pump off the ground. On the top of the pistrol grip there is a blue coloured section that lifts up to create a hook. The thin plastic tube (containing the wires) at the top of the pump can then be secured on this hook.

 

[RogerL]

Regarding the later pistol style Truma water connection, there is a facility to keep the pump off the ground. On the top of the pistrol grip there is a blue coloured section that lifts up to create a hook. The thin plastic tube (containing the wires) at the top of the pump can then be secured on this hook.

Well blow me down, so it does!
No reference in Truma's booklet that came with it though.

 

[woodsieboy]

Just checked our Truma pump,and it does have the hook,I have learned something new again,just shows how useful this forum can be.

 

[ProfJohnL]

........
Both the Truma Ultrastore water heater and the Alde water heater section are designed to have a small amount of air in their uppermost part to minimise surging - in addition to any surge damper fitted - I can't remember what the Carver Cascades did.....

The Cascade also had an air cap.
As cold water is heated it expands. To allow space for the expansion to take place in the water heaters, thery have an air cap, as the air can be squashed. The effect of this is to raise the pressure inside the heater to rise above that of the cold water supply.
Especially for systems operated by a pressure switch, when a hot tap is opened the higher pressure of the hot water will cause it to be delivered instantly as a surge until the tank pressure drops to just below the pressure of the cold water supply. Only when the pressure in the tank drops enough to allow cold water to be addmitted will the pressure in the cold system start to drop enough to activate the pump.
To overcome this Surge dampers are added to the cold pipework. These mimic the air cap in the hot tank, and provide a compliant air spring which is activated by the pressure delivery from the pump. They are not perfect, as they never achieve the same high pressure as the hot tank, but with careful selection of the damper size, the surge effcet can be largely eliminated. The cold damper needs to have about a 50% or larger volume that the hot tanks air cap.