viernes, 27 de abril de 2018

Coffe Machine Philips HD 5670/A

This seems to be a "mildly old" coffee machine: it has been at my family's home for perhaps 20 years, and I could not find anything on it at internet (besides a complain on a second-hand unit).

It is a bulky unit (almost 30*30*15 cm), which does not use capsules (too modern!): it is a conventional, manual espresso machine. It requires that the granulated and toasted coffee is placed on a cup which is then placed against the steam outlet or grouphead. It also has a separated hot steam supply (the steam wand) for heating the milk (or the water).

Main Parts
The machine has mechanical, hydraulic and electrical parts, in three main systems:
- A pump, which receives (sucks) the water from the water tank and pumps it into a boiler.
- A boiler, which creates pressurized hot steam.
- The electrical controls, with sensors and switches on the other parts.

Besides its very simple control, operation-wise is similar to other coffee machine that I described here.

The electrical part is very simple, as indicated in the attached schematics.
The operation is straight: switch S0 starts the machine on/off and the heating resistor (R1), while switch S1 sets the pump in operation (M1), creating the flow of steam. Switch S2 is in parallel to one of the thermal sensors in the boiler (TH4), so it bypasses its function with a kick of additional steam.
The light RD1 (red) is on as soon as the machine is connected (S0), and the light OR1 (orange) is on when the heating resistor is active.

The Pump
The pump is model CS M3637 from Eaton, Mod CP2, with a power of 70 W working at 25-60ºC. It is of the vibrating or solenoid type, described in another post. (Eaton is a giant, and it seems they do not manufacture these pumps anymore; there are a number of internet sites on these pumps and spares: one example here). It is mounted on rubber pads, and it is protected with a thermal fuse (Microtemp 4204A ZKAFZ 98 C; TH2) attached to the body of the pump. (Here on the operation and coding of these thermal fuses, although this one seems to be older).

The Boiler
Made in, in two pieces, bolted (th boiler in aluminium, the grouphead in inox). There is no mark on it. It has a release valve, manually regulated for the steam wand.

The heating resistor (R1) has approx. 43 ohm, which yields a power of some 1,150 W at 220 V (rated 1,260 W).
There are three temperature sensors in contact with the body: two switches from Campini TY60 T180 (TH3 and TH4), and one thermal fuse Microtemp 4300A ZHAHG 152 C (TH1).
(I'm curious about the two thermal switches and the temperature distribution in the boiler, but I have not yet a thermal camera!)
Here on the operation and coding of the thermal fuse, although this one also seems to be older; and here on the specifications of the Campini thermostat switch (“single pole thermostat with snap-action disc”).

The Switches
The three switches are mechanical, of the push type, normally open, with one pole. The manufacturer is ROLD, series CM. S0 and S1 are model E1026 A1 (they retain the closed position when pushed); Switch S2 is model E2015 A1 (does not retain the position when pushed).
ROLD is an Italian manufacturer, a “leader in the manufacture of components for household appliances”. Their webpage does not have catalogues.

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