7
If the pump is not wired when received, wire the motor in accordance with Figure 3, which also illustrates optional controls such as
system pressure switch, oil temperature and pressure switches and cooling water solenoid valve.
When wiring is completed turn the pump by hand to ensure that the pump is free to turn and then momentarily jog the motor to
check that the pump rotation direction is clockwise when facing the drive end. If the pump rotates in the wrong direction reverse any
two of the three motor leads. If a flow switch is provided it should be wired into the motor circuit with a relay so as to stop the motor
in the event the cooling water flow is interrupted.
VACUUM GAUGES
The vacuum gauges to be installed on the pump must be selected to meet the requirements of the particular pump application. Two
general types of vacuum gauges are used for the testing of vacuum equipment, total pressure such as thermistor or thermocouple
gauges, and partial pressure reading McLeod gauges.
•
The McLeod gauge indicates the partial pressure of permanent gasses. It does not indicate the component of pressure due to
vapor such as water vapor. It is not greatly affected by vapor contamination unless the contamination pressure is quite high. It
is most useful in confirming pump performance and for determining the absence or presence of leaks.
•
A high thermistor or thermocouple gauge reading may indicate that the pump is contaminated or that it leaks, or both.
•
A high McLeod gauge reading means that a leak is present.
OPERATION
GENERAL
WARNING: Do not operate the pump in an enclosed area unless the pump discharge is filtered or piped to open
air. Prolonged inhalation of oil mist or vapors is a health hazard.
WARNING: Do not block or restrict the flow of gas from the pump discharge. Back pressure within the pump
could cause severe damage. The belt guard must be properly secured to the pump at all times while the pump
is running.
PRESTART CHECKS
Before starting the pump check the following items:
1. The installation has been made in accordance with the installation section of this manual.
2. The pump has been filled with oil and the cylinder has been filled with water, in accordance with the installation section of this
manual.
3. If the pump has been idle for a month or more - Turn the pump by hand two or more revolutions to distribute oil internally
through the pump.
4. The temperature of the pump oil is 60°F (16°C) or above. Optional pump heaters are available for installation in the cylinder
water jacket.
5. Cooling water is available. Do not start the cooling water flow until the pump has operated a few minutes.
6. Drive belts are correctly tensioned. (See V-Belt Drive in Maintenance section).
7. Direction of rotation is correct.
8. Pump has been filled with oil
STARTING THE PUMP
1. Close the inlet isolation valve.
2. Close the vent valve.
NOTE: If the pump was not vented when the pump was stopped, the following procedure must be used:
a. Remove the power source from the pump.
b. Remove the belt guard panel.
c. Rotate the pump, in proper rotation, by hand using drive belts.
d. Rotate at least 3 full rotations.
e. Replace belt guard panel
3. Start pump
4. Open and adjust the cooling water flow as shown in the specifications.
5. Maintain oil level 3/8” up from bottom of sight when running at “Blank off.” The circulating pump (Gear Pump) increases the oil
pressure to 20 psi (1.4 bar), the check valve will open and oil will be forced into the pump through the main line.