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.
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
red
below) stops the water fill
and operates the drain pump. This float is connected to the float
in the base – either float operates the drain pump.
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