User Guide

Single Zone Gas Monitor
P/N: 3015-4256 Rev 10 27
SECTION 4. MAINTENANCE
4.1. 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 SZ monitor contains sensitive electronic components that
can be easily damaged. Be careful not to touch or disturb any of these components.
4.2. Charcoal Filter (Halogen Gas Monitor Only)
The Charcoal Filter (see Figure 2-4 on page 10) 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.
4.3. Hydrophobic Filters
Hydrophobic Filters (see Figure 2-4 on page 10 and Figure 2-5 on page 11) located in both the gas-
sample and purge lines prevent water from entering the IR detector. A zone flow fault will occur (fault
code <0800>) if the gas-sample filter becomes blocked, while a purge flow fault will occur (fault code
<1000>) if the purge filter becomes blocked. Replace the appropriate filter as required (P/N 0007-1650).
4.4. Servicing Air Lines and Termination Filters
The gas-sample line and the optional purge and exhaust lines should be periodically checked for obvious
signs of kinks, damage, and contamination. Replace the tubing as required.
The gas-sample line and purge-line termination filters prevent dust and dirt from entering the monitor.
Both of these filters should be periodically checked and replaced when there are obvious signs of
contamination. A zone flow fault will occur (fault code <0800>) if the gas-sample line filter becomes
blocked, while a purge flow fault will occur (fault code <1000>) if the purge-line filter becomes blocked. To
service the filter, simply remove it from the line and replace it with a new one (P/N 3015-3420).
4.5. End-of-Line Water Stop (Optional)
The end-of-line water stops (P/N 3015-5512) prevent contaminates and moisture from entering the
monitor. This filter should be periodically checked and replaced when there are obvious signs of
contamination.
4.6. Water Trap (Optional)
The water trap removes moisture that enters tubing before allowing it to enter the internal components of
the SZ unit. The water trap should be emptied often as condensate accumulates. The water trap filter
should be periodically checked and replaced when there are obvious signs of contamination.
4.7. Fuses
The SZ monitor is protected from electrical damage by two, 1 A, 250 V, type “F” fuses (page 10).
Carefully remove the fuses from their fuse clips and visually inspect each fuse for damage. Replace the
fuses as required (P/N 0004-2620).