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5.0 Maintenance
Each boiler installation is subject to varying operating and water conditions. Generally,
the higher operating pressure units (>1800 psi [125 bar]) have improved water treatment
and, as such, maintenance is minimized.
5.1 Water Column
A specific maintenance program is difficult to detail but the following outlines the
minimum required:
(1) The water column should be blown down periodically and visually inspected
for leaks every 3 months.
(2) The operating range of the Model 12B should be verified at this time by
allowing the water column to fill with condensate (see Startup and
Operation sect 3.1).
5.2 Probes
Note: The voltage to the probes from the electronic module is a symmetrical sine
wave 12 Vac RMS or less, resistively isolated. The power, therefore, does not
have to be turned off when working with the probes. Probe tips may be
shorted to ground but should never be subjected to another voltage source.
Assuming trouble-free operation, probes should be inspected after the first 12
months. Thereafter, they should be inspected as required, depending upon the
degree of contamination found at first inspection.
(1) Loosen the probe retaining nut approximately 1 turn and then free the
probe to verify all pressure has been relieved. The metal to metal sealing
surface initially may cause the probe to stick, so carefully free the joint by
tapping the probe on the metal body. Do not strike the zirconia insulator
and do NOT turn the probe hex head nuts or the probe will be destroyed.
(2) After the probe becomes free, loosen the probe retaining nut fully and
remove the probe.
(3) Severe deposits on the probes indicate that inspection should be more
frequent. A common household powdered cleaner may be used to clean
the probe body and the insulator. After cleaning, the probes should be
wiped off with a dry, clean cloth. Do not immerse the probe in liquids.
Probes that show any signs of damage, insulator cracking, or steam
leaks must be replaced immediately. Do not attempt disassembly of the
probe components.
! W A R N I N G !
Before servicing the probes, ensure that the water column is properly isolated
from the system, all pressure has been relieved and the unit cooled to an
acceptable level, otherwise severe personal injury and property damage may
occur.