Tweco HE-150 Coolant Recirculator - Manual (Page 3)

Date: 10/30/98 3 Manual 0-2010
STEP 8:
Connect primary power cable to a suitable power
source as required. Fuse the primary power for 15
amps/110 volts or 10 amps/220 volts. Close the ex-
ternal primary power disconnect switch. Turn the
ON/OFF switch to ON (If the unit is not equipped
with a starter, switch the coolant recirculator switch
to ON).
If the unit is three-phase, check the motor for
proper direction of rotation.
When facing the front of the unit, the fan blade
should rotate to the left. This will blow air
against the heat exchanger.
If the fan is rotating in reverse, blowing air in
the opposite direction, then exchange the pri-
mary leads connections on L2 and L3 in the
starter box.
The HE-l50 should then start.
WARNING
Be sure any primary power is disconnected before
changing any connections.
STEP 9:
Run the HE-100A for several minutes with the reser-
voir cap removed to remove air trapped in the lines.
Turn the HE-100A off and remove the yellow cap. Add
coolant up to the level of the cross-wires inside the
reservoir neck, and install the cap/cartridge assem-
bly supplied with the unit. Replace the cover and se-
cure. The unit is now ready for operation.
MAINTENANCE
1. Coolant Level
The coolant level should be maintained at the level of
the cross-wires. Always use Thermal Arc Torch Cool-
ant (or deionized water with conductivity of less than
0.1 megohm/cm).
2. Coolant Pump
The pump will normally operate at approximately
60° C above the ambient temperature, quite hot to the
touch.
The pressure and flow through the system should be
checked periodically. The pressure may be adjusted
by removing the brass acorn nut on the pump and
turning the adjusting screw. Do not exceed 100 psi, as
this will overload the pump motor.
NOTE
The pump itself should not be disassembled, as this
voids the warranty.
3. Coolant Filter
The filter screen should be checked periodically, par-
ticularly if the pressure or flow drops off. To remove
the filter screen unscrew the large nut on the bottom
of the filter housing. The filter screen may be cleaned
or replaced.
4. Motor
The electric motor bearings should be lubricated once
a year, or approximately every two thousand hours
of operation. There are oil holes at both ends of each
motor. Add 30 drops of electric motor oil or SAE #10
lubricating oil.
5. Fan Belt
Fan belt tension should be such that moderate pres-
sure on the belt gives about 1/2 inch deflection. The
belt tension may be adjusted by adjusting the posi-
tion of the motor.