Filter
Top Products
Installation
a. The recommended fluid charge for the pump is five U. S. quarts. The fluid charge will gradually
be depleted through use, but the pump will continue to operate normally. When the charge is
reduced to approximately 60% of the initial amount, the boiler temperature may begin to rise
and under this condition the thermal switch is designed to open the heater circuit.
b. This diffusion pump is furnished with fill and drain fittings with special Viton elastomer sealed
plugs.
c. If the pump is hot, wait until the pump has cooled then vent it to atmosphere. Remove the
plug from the filling port of the pump and install the needed quantity of fluid up to the FULL
COLD level indicator on the sight glass (see Figure 1-5). The fluid can also be poured in from
the pump inlet or foreline.
d. Replace the fill plug with a new Viton gasket. Tighten the fill plug using moderate torque
(75 inch-pounds maximum). Lubricate the O-ring with pump fluid before installation.
e. Once the pump is running, the oil level should be in the FULL HOT operating range as indi-
cated on the sight glass assembly.
1-12
Figure 1-6. Sight Glass Assembly
NOTE
________
It is not recommended that Santovac 5 diffusion pump fluid be used
with the HS-20.