PHILIPS HI994A
Manual de Servicio

FUNCTIONAL DESCRIPTION OF THE HI 994 MASTER VAPOR Description of the water supply.

� A pin ( 1 ) in the bottom of the housing activates the valve in
the watertank.

� The microswitch ( 2 ) makes sure that the electric circuit is
closed, provided the tank has been fit properly.

� The reed contact ( 3 ) makes sure that the system switches
off when there is no sufficient water in the tank. The floater in the tank ( 4 ) drops when water is pumped to the boiler. Once the floater is at the bottom, the magnet in the floater activates the reed contact, so the reed contact is openend and the circuit is interupted. The light goes on.

� Sensor ( 5 ) in the boiler activates the pump, when the
water level reaches the lowest specified water level. The sensor detects the resistance between the sensor and the water level. When the water level is low, the resistance will be rather high and the pump is activated. When the water level is high, the resistance is low and the pump stops. Functioning of the system � The water tank is filled with water and fitted on the stand. � Switch is operated, light goes on, indicating that water is being heated. � Water is pumped from the tank to the boiler. This can be clearly heared. � Once enough water is in the boiler, the pump stops. � When the pressure is within the limites 2 ± 0.3 bar, there is sufficient steam to start ironing and the the pressostat comes into operation and switches off the element. � Switch can be operated to start ironing. Pilot light switch goes on. � Once the water level reaches the lowest specified level, the sensor activates the pump. � The whole process starts again. The pump is a vibration pump which makes noise during pumping. This is normal. The pump doesn�t pump water continuously. It pumps at the start and during ironing after finishing steaming.
STAND
N S

The HI994 consists of an iron and a stand. Cold water is pumped from the detachable tank to the boiler, where steam is generated. After operating the steam valve, steam flows into the iron.

The stand consists of: I ) A detachable tank : There is a floater in the tank, which activates the reed contact. II ) A pump : The pump is protected against overheating by an automatically resettable cut-out. III) A boiler : On the boiler the following controls are fitted - hand-resettable safety thermostat - boiler thermostat - fuse - pressostat - mechanical safety valve - sensor - electro valve + sieve IV) An electronic control / steering unt, which consists of : a PCB, located below the pump a sensor, located in the boiler

IRON Steamvalve

Safety therm. Boiler therm. Waterlevel control unit Steamswitch

p Prestostat

Pump Thermostat

PCS 99 736