Tweco PAK 44G - Manual (Page 22)

INSTALLATION PROCEDURES 16 Manual 0-2686
3.11 Connecting Torch Leads
1. Check the torch to confirm that it is properly assembled
(Refer to Manual supplied with the Torch).
2. Pass the torch leads and control wire through the bush-
ing on the front panel and connect them to the appro-
priate fittings.
CONTROL
Connector
Torch Leads
Insulating Boot
PLASMA Gas
(+) Fitting
SEC (Secondary)
Gas Fitting
Coolant Supply
(-) Fitting
Coolant Return
Fitting
REMOTE CURRENT
CONTROL Connection
A-02100
Figure 3-10 Torch Leads Connection
WARNING
Be careful working around the unit when power is
on and cover is not in place.
3.12 Filling Power Supply Coolant
1. Remove the yellow plastic cover from the coolant res-
ervoir.
2. Fill the reservoir to the crosswires in the round neck
with Coolant supplied.
NOTE:
It is helpful to make a “splash guard” out of the
yellow cover by cutting a small hole in the center
of it. Replace the yellow cover in the top of the res-
ervoir. This will avoid splashing coolant out of the
unit later on when removing air from the system.
3. Reinstall the yellow plastic cover.
3.13 Initial Start-Up Of System
1. Turn on the main power at the main disconnect switch.
2. Place the ON/OFF switch on the Front Panel to ON.
Check the direction of rotation of the motor against
the arrow on top of the motor. If it is incorrect, re-
move AC input power and reverse any two of the AC
input lines (see NOTE).
NOTE
On units manufactured before 1997 just switch
the FAN ROTATION switch on the Rear Panel.
When the pump starts, the coolant pressure will come
up to approximately 120 psi (8.3 BAR). As the coolant
circulates, trapped air will come out of the torch leads.
More coolant must be added to the reservoir to main-
tain the coolant level. Let the coolant circulate for
about five minutes to get all of the air out.
WARNING
Do not let the pump run without adequate coolant
in the reservoir.
3. While the coolant is circulating, check for leaks before
replacing the cover of the unit.
WARNING
Do not tighten fittings, etc. inside the unit unless
the primary power is turned off at the source.
4. Remove the plastic cover from the reservoir and replace
the cover of the unit (the leads access door must be
open). Start the sheet metal screws but do not tighten
them until the cover is lined up.
5. Carefully close the leads access door, making sure that
the switch actuator enters its slot and activates the
interlock switch. When the cover is properly posi-
tioned, tighten the screws. Replace and tighten the
lifting eye.