Tweco 1000 Merlin(Sept1999) - Manual (Page 40)

SERVICE 36 Manual 0-2731
A-02152
Filter Holder
Filter
Figure 5-1 Coolant Filter Assembly
C. In-Line Filter Assembly
The in-line filter screen should be cleaned periodically.
To gain access to the In-Line Filter Assembly remove the
right side panel (viewed from the front of unit) of the
Power Supply. Remove the filter screen by unscrewing
the filter holder from the In-Line Filter Assembly. 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 re-installing in the In-Line Filter Assem-
bly.
A-02153
Filter Holder
Filter
Figure 5-2 In-Line Filter Assembly
D. 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 (50mm) 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).
E. Draining and Replacing Coolant
Remove the old coolant from the Power Supply reservoir
per the following procedure:
1. Disconnect the coolant input hose to the Coolant
Filter Assembly at the rear panel.
2. 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.
Coolant
Hose
Coolant Hose
Connection
A-02354
Figure 5-3 Draining Coolant From Reservoir
3. Reconnect the hose to the Coolant Filter Assembly.
4. Remove Coolant Reservoir Filler Cap and install
new coolant and deionizer bag.