Teledyne API M751H High Performance Zero Air Generator
MAINTENANCE
07773B DCN6940
33
5.8 Replacing the Hydrocarbon (HC) Scrubber
1. Turn off power and unplug the 751H power cord.
CAUTION
WAIT FOR THE SCRUBBER TO COOL. THE SCRUBBER CASING
AND THE COPPER COOLING COIL WILL BE VERY HOT.
2. Remove the six screws which secure the chassis to the case.
3. Remove the chassis assembly from the case.
4. Remove the cover, exposing the pump and HC scrubber.
5. Disconnect the HC scrubber power at the Controller.
6. Unplug the thermocouple from the control board.
7. Disconnect the pneumatic connections at the REGULATOR OUTLET AND AT
THE COPPER COOLING COIL INLET, using 1/2
″
and 9/16
″
wrenches.
5. Loosen the four captive screws holding the scrubber to the chassis.
6. Lift out the scrubber.
7. Install a new Teledyne API-supplied scrubber (these are purged at the factory)
and tighten the four captive screws.
8. Attach and tighten the pneumatic connections.
CAUTION
ENSURE THAT THE COPPER COOLING COIL DOES NOT TOUCH
ANY WIRE OR CABLE.
9. Reconnect the wiring from the scrubber to the control board.
CAUTION
BE SURE THAT YOU USE A TELEDYNE API-SUPPLIED, PURGED
SCRUBBER. OTHERWISE, DOWNSTREAM COMPONENTS MAY BE
DAMAGED. AN UNPURGED
HYDROCARBON SCRUBBER
PRODUCES A LOT OF WATER WHEN FIRST TURNED ON.
11. Plug the thermocouple into the control board.
12. Turn on the 751H.
13. Connect a millivolt meter to J17 (labeled “HC Scrubber” in Figure 4-4) on the
temperature controller.
Observe that the Heater Relay LED (D8) starts blinking at 11.2 mV (300ºC) and
that the thermocouple voltage holds steady.
14. When all traces of water have disappeared from the 751H output, the output
may be reconnected to the analyzer.
Summary of Contents for 751H
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