PAGE 36 QUANTUM DI HEATER OPERATION / MAINTENANCE MANUAL
7.1.d Fuse Replacement
There are two different ratings of fuses in the electrical control box. See
the Appendix and the electrical schematic for fuse locations. All fuses
are CCMR type.
CAUTION: Fuses must be replaced with the same type of fuse
and rating. Failure to do so could result in a safety hazard and cause
injury to personnel and equipment. Consult factory for further
information.
7.1.e Draining the System
Close heater DI water inlet isolation valve.
Connect fluid inlet to an open drain line. (Alternate: If a drain line is
connected to the cabinet drain on the bottom of the heater enclosure,
the heater may be drained into the leak tray.)
Power system and open DI water inlet isolation valve.
Loosen a fitting in the upper manifold to release internal vacuum in
the line.
The system will drain through the cold DI inlet; a small amount of
water will drain through fluid exit port.
Perform required maintenance.
Reconnect fluid inlet and outlet to process lines and refill the system.
Draining the system with out power requires manual activation of the
inlet isolation valve by pressing the red button (see Figure 7-2:
Isolation Valve).
Figure 7-2: Isolation Valve
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