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Instruction 3015-4256 25
Maintenance
Warnings and Cautions
WARNING: Always disconnect AC power before
working inside the monitor.
CAUTION: When working inside the monitor, be very
careful not to dislodge any electrical wiring or pneumatic
tubing. The HGMSZ contains sensitive electronic
components that can be easily damaged. Be careful not
to touch or disturb any of these components.
Charcoal Filter
The charcoal filter (Page 8) removes refrigerant gas from the purge-air stream during the purging process.
Replace the charcoal filter (P/N 3015-4306) about every 6 months, when a zero filter fault occurs (fault
code <0100>), or after the monitor itself has been exposed to unusually high levels of refrigerant gas, such
as after an evacuation alarm.
Hydrophobic Filter
The hydrophobic filter (Page 8) prevents water from entering the IR detector. A zone flow fault will occur
(fault code <0800>) if this filter should become blocked. Replace the hydrophobic filter as required
(P/N 07-1650).
Servicing Air Lines
The gas sample line and optional exhaust line should be checked periodically for obvious signs of kinks,
damage, and contamination. Replace the tubing as required (P/N 304-2743).
The gas sample line termination filter should be checked periodically and replaced when there are obvious
signs of contamination. To service the filter simply remove it from the line and replace it with a new one
(P/N 3015-3420).
Fuses
The HGMSZ is protected from electrical damage by two, 1 A, 250 V, type “F” fuses (Page 8). Carefully
remove the fuses from their fuse clips and visually inspect each fuse for damage. Replace the fuses as
required (P/N 04-2620).
Clock Battery
The clock battery (Page 8) maintains the correct date and time when AC power is not applied to the
monitor. Replace this battery about every 2 years (P/N 204-0020).
Sample Pump
The sample pump (Page 8) draws the gas sample into the monitor, through the IR detector, and discharges
the sample out the monitor’s exhaust port. When replacing the pump, remove its inlet and outlet tubing,
disconnect the AC power wires from the pump itself, and remove pump from monitor. Install a new sample
pump (P/N 3015-4239).