SERVICE TROUBLESHOOTING
4-2
Manual 0-2728
E. In-Line Coolant Filter Assembly
The In-line Coolant Filter Screen should be cleaned peri-
odically. To gain access to the In-Line Coolant Filter As-
sembly remove the right side panel (when viewed from
the front of unit). Remove the Filter Screen by unscrew-
ing the Filter Holder from the In-Line Coolant Filter As-
sembly. Clean the Filter Screen by rinsing with hot soapy
water. Remove soap residue by rinsing with clean hot
water. Be sure that all the soap has been removed and
the screen is dry of water before reinstalling in the In-
Line Coolant Filter Assembly.
A-02153
Filter Holder
Filter
Figure 4-2 In-Line Filter Assembly
F. Coolant Level and Conductivity
1. Coolant Level
The coolant level should be checked every day at
the rear panel coolant gauge. If the coolant in the
reservoir is more than 2 inches (50 mm) from the
top of the reservoir then add Torch Coolant.
2. Coolant Conductivity
The coolant conductivity level should be checked
if the pilot doesn't start.
Check the condition of the deionizer bag in the
reservoir basket, if the bag is yellowish brown
(straw color) replace the bag and coolant (see
NOTE).
NOTE
To accurately measure the coolant conductivity it
is recommended to use a Conductivity Sensor simi-
lar to Thermal Dynamics Model TDS-73 (Catalog
# 7-2844).
G. Draining and Replacing Coolant
Remove the old coolant from the Power Supply reservoir
as follows:
1. Remove the right side panel from the Power Sup-
ply.
2. Disconnect the coolant input hose to the Coolant
Filter Assembly.
3. Carefully lower the hose out the right side of the
Power Supply and drain the coolant into an ac-
ceptable container.
CAUTION
Handle and dispose of the used coolant per recom-
mended procedures.
A-03049
Coolant
Input Hose
Coolant Filter
Assembly
Coolant
Reservoir
Place hose in
bucket to drain
Figure 4-3 Draining Coolant From Reservoir
4. Reconnect the hose to the Coolant Filter Assem-
bly.
5. Remove Coolant Reservoir lid and install new
coolant and deionizer bag.
6. Reinstall the right side panel.
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