AADCO 737 Series Operating Instructions Manual page 37

13.19 Continued.
NOTE: It may be necessary to remove the ¼-inch tubing joining the purge
connections of the two solenoid valves to isolate that valve which is
producing the improper purge flow.
13.20 Should the cooling fan, Figures 5, 6 and 11 (28), fail, the generator cabinet will
feel unduly warm and the pure air that exits from the PURE AIR fitting on the
rear of the unit will feel warm also, since the cooling fan passes air over the
cooling coil, Figures 5, 6 and 11 (27). To confirm that the cooling fan has
failed, place a hand behind the screened opening on the rear of the generator
unit. If no air flow is evident when the POWER switch is on, replace the fan. It
is held in place by four 6-32 screws with kep-nuts. The electrical connection is
via a push-on connector.
properly to blow air outside the cabinet.
13.21 If the purge valve, Figures 5 and 6 (19), flow setting is accidentally altered,
contact the factory for loan of a proper rotameter and instructions for resetting.
Improper purge flows will cause the production of air which will not meet
specifications.
13.22 THE METHANE REACTOR
13.23 When the POWER switch is depressed, power is applied to the methane
reactor Figure 5, 7 and 7a (20). The METHANE HEAT lamp, Figures 4 (4),
should light and within a few minutes there should be an upscale deflection of
the pyrometer, Figure 4 (7).
(a) If the METHANE HEAT lamp does not light, wait several minutes to see if
there is an upscale deflection of the pyrometer. If there is, then the lamp
is defective. Replace the lamp.
(b) If neither the METHANE HEAT lamp nor the POWER switch lights, check
the POWER fuse, Figure 4 (9). REMOVE THE POWER CORD FROM
WALL OUTLET WHEN CHECKING OR REPLACING FUSES. If the fuse
is okay but the pyrometer indicates a temperature rise after a few minutes,
though both lamps are not lighted, replace both lamps.
(c) If the fuse is blown in (b), remove the cover of the generator unit.
DISCONNECT THE MAIN POWER CORD FROM THE WALL OUTLET.
Disconnect either the black or white lead of the methane reactor, at the
terminal strip. Install new fuse and reconnect the power cord to the wall
outlet.
Be certain that the replacement fan is oriented
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