Quantum 270-11AC3-134 User Manual

Document number: QDC0030PD-11                                                                                                  Page 18 of 40 

 

6f.4: Flushing Of Water Tank 

 

As with other hot water heater tanks, dissolved solids in the water or scale may accumulate in the 
bottom of the water tank forming sludge. This is generally less of a problem with Quantum units as 
no internal elements or burners are used. 

If such sludge build-up does occur the following procedure can be followed to clean out the tank. 

1.    Turn Off power to the unit. 

2.    Turn Off water supply to the unit. 

3.    Remove the blanking plug (brass fitting) from the unused inlet (normally on the right hand 

side for left hand connected tanks) – the inlets are at the bottom of the tank about 70mm up 
from the base. 

4.    Remove the blanking plug from the unused hot water outlet (normally on the right hand 

side for left hand connected tanks) – the outlets are at the top of the tank. 

5.    Allow the water to drain from tank, while the water is draining a non-metallic rod may be 

inserted through the open cold-water inlet and used to break up any sludge and assist in its 
removal. 

6.    Care should be exercised during this procedure so as not to damage the glass lining of the 

tank. The use of metal rods should be avoided and plastic or wooden rods used instead. 

7.    Turning the cold water supply back on while the tank is emptying or after the tank has 

drained and continuing with the mechanical agitation will further assist with the removal of 
the sludge. 

8.    Once tank has been cleaned, as much as possible, the cold water should be turned off again 

and the blanking plugs refitted. Care should be taken to ensure good a hydraulic seal is 
maintained – the use of plumbing tape will be required. 

9.    When unit is fully reassembled the cold water supply and power supply can be turned on 

and the unit allowed to reheat. 

6f.5: Refrigeration & Thermostat Servicing 

Qualified refrigeration technicians only should service the heat pump. The information provided in 
Appendix A: Trouble Shooting Guide will provide the necessary information for qualified 
personnel to service this part of the unit.