CAUTION
Before connecting your vacuum pump to an
A/C-R system, remove refrigerant from the
system in an accepted manner. Damage to the
pump may occur if evacuation is started while
the system is under high pressure. Robinair
recommends use of our Refrigerant Recovery
and Recycling equipment.
Wiring Instructions:
The CoolTech features dual voltage ranges.
Before operating the pump, read and follow these
rewiring instructions (if necessary) to be sure your
pump is wired for the appropriate voltage.
CAUTION
Unplug the unit before beginning any service
work. Improper use or connections can cause
electrical shock. Only qualified personnel
should perform service work.
The CoolTech vacuum pump is factory wired for a
high voltage range of 220 to 240 volts. To wire the
switch for a low voltage range of 110 volts to 115
volts, follow these steps.
1. Disconnect the unit from the AC power
source before proceeding.
2. Loosen the screws on the plate at the rear of
the motor, and carefully move the plate aside
to clear the opening.
3. Disconnect the leads and reconnect for low
voltage, following the diagram and chart.
(High voltage connections are also shown
if you want to rewire at some time.)
4. Check to see that all connections are
secure and that there are no short circuits.
Be sure the grounding connector is properly
connected.
5. Re-install the plate on the rear of motor with
the screws which were loosened in Step 2.
IMPORTANT: Check for short circuits using a
continuity tester before reconnecting to the AC
power source.
In all cases, motors are designed for operating
voltages plus or minus 10% of the normal rating
(see SPECIFICATIONS). Single voltage motors
are supplied fully connected and ready to
operate.
1. Check to make certain the voltage and
frequency at the outlet match the specifica-
tions on the pump motor decal. Check the
ON-OFF switch to be sure it is in the OFF
position before you plug the pump into an
outlet. Check to be certain the gas ballast
valve is closed. Remove and discard the
exhaust plug from the end of the pump’s
handle.
2. The pump is shipped without oil in the
reservoir. Before starting the pump, fill with
oil. Remove the OIL FILL cap (black plastic
plug directly in front of the handle) and add
oil until oil just shows in the bottom of the
sight glass. The approximate oil capacity of
the pump is 400 milliliters.
3. Replace the OIL FILL cap and remove the
cap from one of the inlet ports. Turn the Iso-
Valve to OPEN. Turn the motor switch to
ON. When the pump runs smoothly, turn the
Iso-Valve to CLOSED and replace the cap
on the inlet port. This may take from two to
30 seconds depending on the ambient
temperature. After the pump runs for
approximately one minute, check the sight
glass for proper oil level — oil should be
even with the sight glass OIL LEVEL line.
Add oil if necessary.
NOTE
:
When the pump is running, the oil level
should be even with the line on the sight glass.
Underfilling will result in poor vacuum perform-
ance. Overfilling can result in oil blowing from the
exhaust.
Your pump is now ready to evacuate air condition-
ing and refrigeration systems. Follow normal
service procedures and the A/C-R manufacturer’s
instructions for connections to the system.
Before using your vacuum pump
Operating Manual
4
Emerson MotorsGeneral Electric Motors
