Alde 1900 811 Mode D'emploi page 2

INSTRUCTIONS FOR ALDE SERVICE PUMP 1900 811
SETTING UP THE PUMP
1. Remove cap (and circulation pump if applicable) from expansion tank.
2. Insert pump head into expansion tank.
NB: The nozzle should be firmly seated in the out port of the expansion tank.
3. Place feed pipe into a pre-prepared filling container. This should contain the HTF (see below).
4. Connect 12 V supply to the service pump.
FILLING
1. Turn the valve handle so it is pointing along the braided hoses to the pump motors.
This is the fill position (Fig A).
2. Switch 1 and Switch 2 operate Pump Motor 1 and 2 respectively. Using one of the switches, activate one of
the pump motors. The system will be filled with the HTF from the container. Fill until fluid level is about 1 inch
above MAX mark on the expansion tank.
NB: Be careful to switch off the first pump motor and not switch on the second.
3. Wait for 2 mins. If the fluid level drops in the expansion tank, top up to about 1 inch above MAX mark again.
NB: Bubbling and gurgling noises are normal at this point.
4. Repeat above steps until satisfied the fluid level is stable. You are now ready to bleed the system of air.
BLEEDING
1. Turn the valve handle so it is pointing along the braided hose to the expansion tank. This is the cycle position
(Fig B).
2. Using one of the switches, activate one of the pump motors. Count to 3. Now activate the second pump motor
with the second switch. The fluid is cycled around the system at high flow rate, trapped air is forced out of the
expansion tank and automatic air bleed valve on the boiler.
NB: Bubbling and gurgling noises are normal at this point. Rumbling can occur if a lot of air is trapped in
the system.
3. The pump should be attended at all times. Do not allow the fluid level to drop below MIN mark.
4. If the fluid level drops in the expansion tank, top up to about 1 inch above MAX mark again.
5. Continue to cycle for 10 mins. There should be no large bubbles in the fluid, visible through the clear plastic
braided hoses.
6. Switch off both pump motors.
7. To assist the end user, from the expansion tank, follow the pipework around the system, bleeding air from any
bleed points as per Operating and Installation Instructions for the boiler. This is especially helpful to the end user
if the system is fitted with towel rails or panel radiators.
8. Once the system is bled, lower the fluid level to 1/2 inch above MIN mark (see below).
LOWERING FLUID LEVEL
1. With the service pump still set up, ensure both pump motors are switched off.
2. Turn the valve handle at a right angle to the hoses. This is the syphon position (Fig C).
3. The fluid level will drop slowly. Once the fluid level is 1/2 inch above MIN mark, turn the valve handle back to
either fill or cycle position and this will halt the syphon effect.
4. The system is now filled, bled, and at the correct fluid level for use.
5. Disconnect 12 V supply to the service pump, remove the pump head.
NB: The hoses are still filled with HTF. Be careful not to drip fluid from the pump head. Have a towel on
hand.
6. Refit the expansion tank cap (and circulation pump if applicable).
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