Varian F1730308, Instruction Manual

Page: 29 / 49

Installation
1-9
Water Requirements
4 gallons per minute at 60° to 80°F inlet temperature pressure
drop across series curcuit of cold trap and body – 40 PSI.
Figure 1-4. Water Cooling Connections
If the water supply pressure is low, it may be necessary to connect the different sections of
cooling coils in parallel. This should be done if the cooling water discharge temperature
exceeds 130°F (54°C). The cooling water discharge should, if possible, be connected to an
open drain so that cooling water flow can readily be checked.
b. If the quick-cool coil is required, it must be connected to an open drain and the feed line con-
trolled by a separate water 3-way valve (open, closed, and vent to atmosphere). The drain
must be below the boiler level so that it is drained completely when the quick-cool coil water
supply is shut off and the pump is operating.
1-6-4 Electrical Connections (See Figure 1-5, 1-6, or 1-7, Diffusion Pump Wiring Diagram)
a. The pump heater has been designed to operate at a certain voltage. Check the heater for
correct supply voltage and, in the case of multiphase connections, for load balance by
measuring the resistance of each branch. (See page 1-10, 1-11, 1-12 for proper resistance.)
WARNING
_____________
High voltages (up to 480V) can kill. Always break the primary circuit to
the pump before starting to work on the heater and/or its wiring.