Pump for filling the solar thermal sytems with antifreeze.
Normally the pump contains some black iron parts, while the 'all brass' pump doesn't.
Please note, this is a cheap simple tool. I designed it to do the job but it isn't perfect nor designed to be used by multiple generations. There is a plastic piston inside, which may expand if you don't clean it fully after each use, and also an O ring which may leak and let out some fluid at the back.
The corresponding 0.5 meter hose must be inserted into the bottle or container containing the antifreeze liquid or rinsing water. There is a hose end at the end of the other 2-meter hose, which must be connected somewhere to the system.
Here you can read filling with antifreeze, refilling, replacing in more detail .
Maximum operating pressure that can be produced: 3 bar depending on the fitness level of the person performing the filling. But the usual 2 bar pressure is easily available.
If the filling is done by two people, so that one person fills the container with PET bottles and the other person continuously pumps, then the pumping goes a little faster than refilling from bottles. That is, surprisingly quickly.
Due to the simple structure of the piston unit, leakage may occur near the pump shaft. If this becomes troublesome, send back the piston unit and we will replace the seal and, if necessary, the piston within the warranty period free of charge.
Before first use, the pump must be assembled using LOCTITE 55 sealing cord or Teflon tape (not included). Tighten the piston unit by hand only.
After use, the pump must be rinsed with clean water and it is advisable to remove the piston unit and drop a little oil on the piston, then run it. The hose ends must also be removed and the entire structure must be dried. You can read about pump maintenance here.
Connection hose end size: 3/4". In other words, the system must have a 3/4" external threaded connection point equipped with a tap.
Contents of the package:
- 1/2" hose with sealing ends at both ends (washing machine hose) 1 pc
- 1/2" hose with sealing end at one end 0.75m (washing machine hose cut in half) 1 pc
- 1/2"-3/4" nipple 2 pcs
- 1/2" non-return valve 2 pcs
- 1/2" nipple black 2 pcs
- 1/2" Tee black 1 pc
- 1/2" piston unit 1 pc