A SH / S-TRAC MANUAL
23 of 29 Feb 06
Water valve failure
The S-TRAC has internal timers to monitor the valve activity. When a valve or fill rate do not behave in a
logical manner a lock out will occur. For example, if the S-TRAC started to refill the tank water level, but
after several minutes the water level still has not proved conductivity on the fill probe (no water, failed
valve) the S-TRAC will lockout. This is a pre-set timed event based on the size of the humidifier.
MAINTENANCE
SCALE REMOVAL
Over time calcium and other minerals will build up on the water probes, tank and heat exchanger. As the
calcium builds up the probe resistance will increase. The water level has to rise to a higher level before
conductivity is proven. Given enough time and lack of maintenance the water level will keep rising until it
overflows. At this point the S-TRAC will lock out. To restore operation, the probes must be cleaned or
replaced.
The type of steel used in the tank and heat exchanger has a relatively high coefficient of expansion. As the
tank heats and cools, the built up scale will crack and eventually fall off. To clean, open the tank lids, and
remove any fallen scale from the bottom of the tank and then use a moisture rated vacuum to remove the
remaining smaller pieces. Ensure the drain connection and any connected piping is free of obstruction.
Record the date and the relative amount of scale for reference. The scale build up should be examined
weekly after start-up to determine an effective maintenance schedule.
SAFETY SHUTOFF VALVE LEAK TEST:
Safety shutoff valves require a qualified technician to perform a leak (bubble) test to determine tightness of
closure on a least an annual basis. A very small amount of leakage is normal. Valve leakage rates
exceeding those noted in the table below require repair or valve replacement.
1. De-energize the control system.
2. Close the upstream manual gas valve.
3. Connect a ¼” (6mm) tube to the outlet
pressure tap on the safety shutoff valve.
4. Immerse the opposite end of the ¼” (6mm)
tube (cut to a 45° angle) vertically ½” (13mm)
into a clear container of water.
5. Count the number of bubbles appearing
during a 10 second period.
6. If the bubble rate is greater than that noted in
the table repair or replace the valve.
7. If bubble rate is less than noted in the table,
remove the ¼” (6mm) tube, reconnect the
outlet pressure tap plug.
8. Energize the control system and open
upstream manual gas valve.
9. After testing check all piping connections and
plugs for external leakage.
The table below indicates the maximum number of
bubbles in relation to the size and type of valve.
1/2 (13mm)
CUT AT
45 DEGREE
ANGLE
JAR OR GLASS WITH WATER
1/4 IN (6MM) ALUMINUM OR
COPPER PILOT TUBING
1/4 (6MM) FLEXIBLE TUBING
GAS SUPPLY
UPSTREAM
MANUAL
GAS COCK
PVR SSOV
MANUAL
GAS COCK
DOWNSTREAM
TEST
TAP
LEAK
A B C ED
1
CAN ALSO BE A PERMANENT PETCOCK.
PRV = PRESSURE REGULATING VALVE.2
USE ONLY ONE OF THE DOWNSTREAM TAPS ON THE SSOV.
SSOV = SAFETY SHUTOFF VALVE.
4
3
2
3
4
DOWNSTREAM
GAS COCK
MANUAL
1
F
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