64
VAPORSTREAM INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
INSPECTION AND MAINTENANCE
1.
Annually
(also recommended when main te nance is performed)
•
All safety devices in the control circuit should be cycled on and off to
verify they are functioning. These include:
– High limit switch
– Airfl ow proving switch
–
Low water level probe. Pull out probe plug; fi ll valve should energize.
• Inspect tank and gaskets for leaks.
•
Measure current draw of heaters and verify amp values per stage by
comparing to the wiring diagram located inside the control cabinet. This
identifi es any burned out heaters. Only qualifi ed electrical personnel
should perform this task.
2.
Seasonally
(or as required, depending on water quality)
• Cleaning the tank
–
Remove cleanout plate; slide the cleanout tray out, and dispose of
any loose scale that has collected in the tray.
–
Remove any additional scale that has accumulated on the bottom
of the humidifi er tank. This should be done before the scale buildup
reaches the bottom of the heaters.
–
Inspect the area inside the tank in front of the drain valve fi tting and
thoroughly clean all scale and mineral buildup from that area.
• Cleaning the probes
–
The probe assembly is located under the heater terminal cover.
Access the probe assembly through the probe cover located on the
end of the heater terminal cover.
–
Disconnect the probe plug and cable assembly and unscrew the
probe rod assembly from the humidifi er probe housing using the
probe tool (see Figure 64-1).
–
Inspect the probe housing and clean, ensuring that all the housing
passageways for water fl ow are clear. Remove the housing from the
holding bracket by removing the humidifi er cover and sliding the
housing horizontally toward the open end of the bracket.
– When sliding probe housing into bracket from which it hangs, orient
housing so neither water fl ow slot directly faces tank wall at back
end of bracket.
–
The scale should fl ake off easily from the probe assembly rods.
–
The bottom 3/8" (10 mm) of each rod is the sensing portion; clean
these areas with a wire brush, abrasive pad, or steel wool.
–
Inspect the composite plastic probe rod assembly for any signs
of cracking, roughness, or deterioration. If found, replace probe
assembly.
–
Apply silicon sealant to the probe gasket, and reassemble the probe
assembly using the probe tool (see Figure 64-1).
Tap/softened water:
Remove and install probe assembly with
supplied probe tool. Attach a 3/8" square
drive to the probe tool.
When installing, torque probe assembly to 120
in-lbs (10 ft-lbs; 13.6 N-m). Probe tools can be
ordered from your DriSteem representative (Part
no. 185101).
MAINTENANCE
Probe tool
OM-7395X
mc_060310_0735
FIGURE 64-1: PROBE TOOL
Inspection and maintenance