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July 19, 2004
Table 16. Battery Heater Pad Inspection Procedure Test Values
Group
14 or 15 (120 V AC heater)
Note: The heater pad is designed to turn on at 32 ± 5°F (0 ± 3°C) and not turn off until its
thermostat senses 50 ± 5°F (10 ± 3°C).
5. If the pad is on, verify the resistance measurement and turn it off by heating the thermostat to verify it
opens. (Can be heated by holding an ungloved hand or a heat gun to it until it clicks open.)
6. If the pad is off, turn it on by cooling the thermostat to verify it closes and has the correct resistance
measurement. (Can be cooled using a freeze spray.)
7. If the pad is operating properly, reconnect its connector to field cabinet wiring.
8. If the pad is not operating properly, replace it using Battery Heater Pad Replacement procedures.
Battery Heater Pad Replacement Procedure
Replacing a battery heater pad requires that the batteries on top of the pad be first removed. Remove the batteries
and replace the heater pad as follows:
1. Place the battery breakers located on the Valere shelf in OFF position.
2. Locate the AC panel and identify the circuit breaker for the battery heaters and turn to the OFF position.
3. Disconnect the inter-battery connections and the battery string cables for the batteries.
4. Remove the batteries from the cabinet.
5. Locate the thermostat, which is mounted to the battery heater cover at the left side of the battery compart-
ment. Using a screwdriver, remove the thermostat.
6. Follow the leads from the thermostat to the connector and disconnect it.
7. Using a Phillips screwdriver, remove the four screws that secure the battery heater cover which are located
across the front of the cabinet.
8. Lift the front of the battery heater cover and slide the cover forward to remove.
9. Remove the defective pad and replace it with the new replacement heater pad.
10.Reinstall the battery heater cover.
11.Install the thermostat of the new pad as the old thermostat was installed.
12.Connect the new pad to the cabinet wiring.
13.Turn on the battery heater circuit breaker at the AC panel.
14.Reinstall the batteries following the instructions provided in this section.
ADC Telecommunications, Inc.
On
56 ± 15 ohms (Version 1)
78 ± 15 ohms (Version 2)
SCP-PGCAB001-010-01H
Off
Open circuit (OL or > 1 M ohm)
49
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