Bosch SHE55P Repair Manual page 16

4.1.6.6 Johnson Tee installations (Washington State)
Drain pumps in installations with Johnson Tees (in Washington
State) must use stronger 4-vane pumps (# 184178 spade /
607468 Rast 5).
Standard 9-vane drain pumps (#
167082 spade / 642239 Rast 5) are
quieter and smoother than 4-vane
pumps. Older spade terminal pumps
had 6-vanes.
4.1.7 Water fill assembly
The water fill assembly is easily accessed from the left side by
just removing the left side panel. It can be a pressure-fill (with
diaphragm) or time-fill, depending on model.
4.1.7.1 Pressure fill
Pressure-fill assemblies use a diaphragm to accurately measure
water levels.
702_58300000148618_ara_en_a
During normal fill, rising water compresses air in a chamber until
the diaphragm operates when the proper water level is reached.
If water overfills, the float (shown in
and operates the drain pump. This float is connected to the float
in the base – either float operates the drain pump.
red below) stops the water fill
Page 16 of 42