Armfield S12-MKII, Instruction Manual

Page: 31 / 67

Routine Maintenance
27
removed using the Allen key supplied. The nozzles should be refitted after
cleaning using PTFE tape to seal the threads.
7. After prolonged use the marbles in the river inlet tank will become dirty. The
marbles should be transferred to a suitable container, soaked in a weak
bleach solution then rinsed using clean water. The river inlet tank should be
cleaned using warm soapy water then rinsed using clean water before
returning the marbles.
8. After prolonged use the weir chute/diffuser and outlet collecting tank will
become dirty. These should be removed from the equipment, washed using
soapy water then rinsed using clean water. DO NOT use abrasives or
solvents. After cleaning the components replace the clear polythene skirt with
slits at the base of the weir chute/diffuser using an elastic band to secure it.
This prevents splashing when water and sand fall into the collecting tank.
9. Provided that the ambient temperature is 20 o C or less then precautions will
not be necessary against Legionella or other hazardous micro-organisms
(Refer to the notes on
Water-Borne Hazards within the Important Safety
Information section). If the temperature of the water will exceed 20 o C in use
then it will be necessary to take precautions. We would not recommend the
use of a strong permanent disinfectant or bleach since the operator will
handle the sand when using the equipment. To prevent a hazard to health we
would suggest that the tank and pipework (including the spray system) be
flushed with a weak hypochlorite bleach solution before using the equipment.
10. Adjusting the pressure relief valve.
The outlet from the centrifugal pump incorporates a pressure relief valve to
limit the system pressure to a maximum of approximately 3.0 barg and
prevent the pump from overheating if the flow from the two outlets is restricted
or stopped. Water discharging from the relief valve is returned to the sump
tank via a connection in the side wall of the tank. When demand from the two
outlets is high, the relief valve will remain closed to maintain the pressure in
the system. When demand is reduced and the system pressure rises above
3.0 barg, the valve will open to relieve the excess flow.