Can anyone point me to some threads or websites showing the proper procedure and pipe routing options for a water tank with pump installation. Also, anyone found an English language manual for the Mitsubishi Electric waterpumps sold in Thailand? Thanks in advance. 

24 minutes ago, Pattaya Spotter said:

Can anyone point me to some threads or websites showing the proper procedure and pipe routing options for a water tank with pump installation. Also, anyone found an English language manual for the Mitsubishi Electric waterpumps sold in Thailand? Thanks in advance. 

There are threads here with the information you want.

This is my usual pump-setup drawing:-

 

1 hour ago, Crossy said:

This is my usual pump-setup drawing:-

 

 

That's basically what I have with a bypassable 20" sediment filter just after the water meter on the left and another bypassable 12" paper contaminant filter before the pressurized water enters the house on the right. The former is to catch dirty water from frequent repairs to the city water supply and the latter was to filter contaminated water that was already in the tank system (I have two in series). We had about three weeks of random city water outages at the time so I wasn't about to drain and flush the tanks and make myself Mr Popular!

 

I added the lower non-return valve more recently to provide a modicum of water for toilets and hand washing in the event of a power cut but it's only as good as the local mains water pressure which is all over the shop.

My waterpump "blew out" this past week and that's the reason for my op...I need a new one and want to see that it is fitted properly.  However, maybe someone could explain why I lost my pump to begin with. Here's my set-up and what happened. I have city water going to a storage tank which feeds into a WP series Mitsubishi pump. My system also has a bypass so I can just use city water like now when the pump is not working. When it is working, I don't know if I'm just using one or the other or some combination of both water sources.

 

So everything was working fine and I went on a 3 day trip. When I returned, there was no water at the taps. I checked the tank and it was full and a check of the pump had it making a low pitched humming sound. I asked around and apparently the city water was turned off a day before I returned (mains break) and would return the next evening. My question is why did my pump blow? Would it have something to do with no city water, even though there was water in my storage tank. I had a handyman try to repair it and he fiddled with it for a few hours and pronounced the motor kaput. Any ideas or suggestions...should I unplug the pump if I'm going away on holidays?

1 hour ago, Pattaya Spotter said:

My waterpump "blew out" this past week and that's the reason for my op...I need a new one and want to see that it is fitted properly.  However, maybe someone could explain why I lost my pump to begin with. Here's my set-up and what happened. I have city water going to a storage tank which feeds into a WP series Mitsubishi pump. My system also has a bypass so I can just use city water like now when the pump is not working. When it is working, I don't know if I'm just using one or the other or some combination of both water sources.

 

So everything was working fine and I went on a 3 day trip. When I returned, there was no water at the taps. I checked the tank and it was full and a check of the pump had it making a low pitched humming sound. I asked around and apparently the city water was turned off a day before I returned (mains break) and would return the next evening. My question is why did my pump blow? Would it have something to do with no city water, even though there was water in my storage tank. I had a handyman try to repair it and he fiddled with it for a few hours and pronounced the motor kaput. Any ideas or suggestions...should I unplug the pump if I'm going away on holidays?

Sounds like maybe you weren't running off the storage tank and without low-inlet pressure protection, when city water stopped, the pump ran dry, then hot, then seized. If the 'bypass' isn't automatic or not working properly, then this can happen. From personal experience, it may also be only the impeller that's seized and the motor is OK.

 

Get a new pump but I would recommend getting the motor and/or impeller changed on the old one at a proper pump repair shop (Mitsubishi parts are plentiful and the pumps can take a lot of abuse) and keep it as a spare.

 

Whenever I leave the house unattended for a few days, the pump gets turned off as well as the main stop cock at the meter. You can get a burst flexible hose under a sink that will easily drain your tank and run your pump dry while you are out (personal experience again).

Does anyone have any recommendations for NRV or CheckValves ? I’ve seen the Sanwa ones with a spring mechanism but read that they don’t last long. Any plastic ones here ?