Maintenance
EGM-4 Operator's Manual – Version 4.19
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ZERO Valve
If it is suspected that the ZERO valve is not functioning properly, we recommend returning the
EGM-4 to our factory for repair as this item is soldered directly to the PC075 circuit board.
Contact PP Systems (see PP Systems’ Contact Information on page 7).
12V Lead Acid Battery
Some EGM-4’s are supplied with a 12V 2.0 Ah sealed, rechargeable, lead acid battery and it
should last for several years as long as it is properly maintained. Based on manufacturer’s
data, the battery is non-spillable (qualified to non-spillable UN2800 standards) and can be
used in any orientation. It has a float design life of 5 years. It should be checked periodically
to ensure that it takes up charge. Measuring the voltage across the terminals of the battery
after it has been charged overnight can assess this.
If the battery is not fully charged after 12 hours, first check that the 1A fuse is ok. This fuse
protects the charging circuit and if blown, the internal battery will not take a charge.
Please Note. The internal 12V battery should always be fully charged before long-term
storage. If it is stored in a low or discharged state, it is possible that it will become deep-
discharged. If this occurs, the charge capacity of the battery is permanently reduced and will
require replacement.
12V Lead Acid Battery Specification
Nominal Capacity
@ 20 hr.rate (Ah)
14.6cm L x 8.8cm W x 2cm D
Removing The 12V Lead Acid Battery
When removing the battery, first ensure that the power to the EGM-4 is turned off. The front
panel may need to be removed to slide the battery out of its compartment if it is stuck. Next,
remove the red (positive) and blue (negative) charger leads from the battery.
remove the front panel
pull panel forwards, and
through hole provided.
Red (Positive) Charger Lead
Blue (Negative) Charger Lead
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