10
Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
918S‑‑1130 PP rev 12‑21‑2020
e. Perform step 2 above to verify the battery level and overall operation of the Alarm.
4. If the “BATTERY LOW” indicator illuminates at any time, replace the internal battery by performing the
following steps:
CAUTION:
The following steps should be followed being sure that there is no possibility of fluid ingress
into the alarm enclosure.
ATTENTION:
Les étapes ci-dessous doivent être suivies avec l’assurance qu’il n’y a aucune possibilité
d’entrée de fl uide dans l’enceinte de l’alarme.
Steps
a. Carefully open the 918 Series Alarm enclosure by loosening the Phillips head fasteners at the four
corners of the cover.
b. Turn off the power switch, SW5 (see Figure 1).
c. Disconnect input device(s) from the Alarm Circuit Board by unplugging the channel connectors from
the Alarm Circuit Board.
d. Disconnect the battery cable from the Alarm Circuit Board (J7). Gently depress the retaining tab of the
connector and pull the connector free (see Figure 6).
e. Remove and retain the two screws holding the battery assembly to the rear cover and remove the
battery assembly from the Alarm (see Figure 7).
f. Install and secure the new battery assembly into the rear cover using the two screws retained in the
previous step.
f. Install and secure the new battery assembly into the rear cover using the two screws retained in the
previous step.
g. Connect the new Battery Assembly to the Alarm Circuit Board’s J7 being sure to fully seat the
connector. Gently tug on the cable to ensure the retaining tab has clicked into place.
h. Turn on the power switch, SW5 (see Figure 1).
NOTE:
If the 918 Series Alarm has been configured to operate with Normally Closed Contacts, the
Alarm should go into the alarm state when the power switch is turned on; silence this by pressing
the “Test/Cancel” button.
i. Test the Alarm by pressing and holding the “Test/Cancel” button until the alarm sounds at least three
times while observing the Channel Alarm and BATTERY LOW indicators (see Figure 1).
j. The 918 Series Alarm indicates the following:
• The BATTERY LOW indicator will flash momentarily at the beginning of the cycle.
• If the Audible Alarm is configured to sound with an alarm condition, it is loud and strong.
• The Channel Alarm indicators will illuminate when the Audible Alarm is not sounding. If
configured for no audible alarm, only the Channel Alarm indicator(s) will flash.
• BATTERY LOW indicator is NOT illuminated after the initial momentary flash.
k. If alarm does not sound, the Channel Alarm Indicators does not illuminate or the BATTERY LOW
indicator illuminates, replace the Alarm Box or call Morrison Bros. Co. Customer Service.
l. Connect the input device to the Alarm Circuit Board. Connect input device to the Channel Input
Connector (see Figure 2).
m. Reattach the front cover of the Alarm using the Phillips head fasteners at the four corners of the cover.
DO NOT OVERTIGHTEN. “Snug” the fasteners in place and verify that the cover is fully seated to
the enclosure base.
Figure 6 Disconnecting the Battery from the Control Board
n. It is recommended to simulate an alarm condition and manually trigger the alarm using input device
(Clock Gauge, float switch or other dry contact device). If it does not, check wiring at junction box and
Retaining
Tab
Depress Retaining
Tab and pull gently
