Electrolux B Series Manual page 23

Mould Heater
A mould heater, rated at 115 watts and covered with an aluminium sheath, is embedded in the grooved
section on the underside of the mould. When the mould heater is energised, heat melts the ice contact
surface within the mould, allowing harvest of the ice pieces. The mould heater is wired in series with
the ice maker thermostat, which acts as a safety device. The original heater is staked in place, but can
be removed for replacement. The replacement heater is secured to the mould by four flat head
retaining screws that thread into holes in the mould, adjacent to the heater. A thermal mastic sealer is
placed between the heater and the mould to ensure good thermal contact.
Ice Stripper
An ice stripper is attached to the mould to prevent ice pieces from falling back into the mould. It also
serves as a decorative side cover.
Ice Ejector
The ejector blades are moulded from Delrin, and extended from a central shaft, which turns in nylon
bearings at the front and rear. Each blade sweeps an ice section out of the mould. The drive end of the
ice ejector is "D" shaped. The other end of the shaft has a moulded cam to activate the signal arm.
Silicone grease is used to lubricate the bearing surfaces.
Water Valve Assembly
The water valve is solenoid operated and when energised, releases water from the supply line into the
ice mould. The amount of water is directly proportional to the length of time the water valve switch is
energised. A flow washer inside the water valve maintains a constant rate of water flow over a supply
line pressure range of 15 to 100psi. it will not compensate for pressure below 15psi, or greater than
100psi. A 60 mesh screen, placed ahead of the flow washer, filters out foreign materials. The solenoid
coil draws 10 to 15 watts. The coil is wired in series with the mould heater, across the supply voltage.
Thermostat
The thermostat is a single-pole, single-throw, bimetallic, disc-type, thermal switch. It automatically
starts the harvest cycle when the ice is frozen. The thermostat opens at a temperature 8.9ºC and closes
at a temperature of –9.4ºC. Wired in series with the mould heater, the ice maker thermostat acts as a
safety device against over-heating in case of mechanical failure. A thermal mastic bond is provided
where the thermostat is mounted against the mould.
Signal Arm and Linkage
The signal arm is cam-driven and operates a switch that controls the quantity of ice produced. In the
harvest cycle, the arm is raised and lowered during each of the two revolutions of the timing cam. If
the signal arm comes to rest on top of ice in the storage container during either revolution, the switch
will remain open and stop the ice maker at the end of that revolution. When sufficient ice is removed
from the container, the arm lowers and ice production resumes. To manually stop the ice maker, switch
the ON/OFF switch to OFF. Operation is resumed when the ON/OFF switch is switched to ON.
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