Altech CPS 130-4 Instrucciones De Montaje página 8

b) VENT PLUG SWITCH OFF THE PUMP. Close valve on the discharge side. Carefully
loosen and fully remove the vent plug with a suitable screwdriver
(Fig 4a), carefully push pump shaft back several times with screwdriver.
Switch on pump. It is possible that the pump blocks with the vent plug open,
depending on the system pressure. After 15 – 30 s tighten the vent
plug. Reopen the valve.
Note, a system may take 24 hours to vent all the air in the system to atmosphere.
ATTENTION DO NOT run the pump dry as this will result in bearing failure.
SPEED REGULATOR – STANDARD PUMPS
Speed regulator adjustment should only be made with electrical supply
switched off.
Models offer a single or variable speed setting to allow system requirements to
be accurately met. (Fig 5a).
1. It is always preferable to use the lowest performance where this gives
circulation sufficient to heat all the heat emitters evenly (uneven distribution
of heat may be due to the need to balance the flow of water in each
heat emitter).
2. If the pump is set at too high a speed, flow noise may occur in the system and
in particular at the thermostatic valves. This can be rectified by switching to a
lower speed.
3. If the pump performance requirement is not known start with the lowest pump
setting. If heat emitters remain cold, or if the boiler inlet and outlet temperature
differential (specified by the manufacturers of the boiler) is not achieved
increase the flow by adjusting the speed control as shown in (Fig 5a).
ATTENTION Too high a speed setting may result in pumping over or drawing in air.
Important - DO NOT use pump isolating valves for performance control.
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GB