SAFETY DEVICE TESTING
6-1
Chapter 6 SAFETY DEVICE TESTING PROCEDURES
6.1 TESTING OF SAFETY DEVICES
Periodic testing of all controls and safety devices
is required to ensure that they are operating as
designed. Precautions must be taken while tests
are being performed to protect against bodily
injury and property damage.
Systematic and thorough testing of the operating
and safety controls should be performed on a
scheduled basis, or whenever a control
component has been serviced or replaced. All
testing must conform to local jurisdictions or
codes such as ASME CSD-1.
NOTE:
MANUAL and AUTO modes are required to
perform the following tests. For a complete
explanation of these modes, see Section 3.
NOTE:
It will be necessary to remove the sheet
metal covers from the unit to perform the
following tests.
WARNING!
THIS IS A 120-VOLT AC COMBUSTION
SAFEGUARD SYSTEM. POWER MUST
BE REMOVED PRIOR TO PERFORMING
WIRE REMOVAL OR OTHER TESTING
PROCEDURES THAT CAN RESULT IN
ELECTRICAL SHOCK.
6.2 GAS PRESSURE FAULT TEST
1. Referring to figure 6.1, ensure that the 1/4"
ball valve located at the low-pressure gas
switch is closed.
2. Remove the 1/4" plug from the 1/4" ball
valve.
3. Install a 0-16" W.C. manometer or W.C.
gauge where the 1/4" plug was removed.
4. Slowly open the 1/4" ball valve.
5. Place the unit in manual mode and fire
between a 25% and 30% firing rate.
6. Slowly close the manual gas shut-off valve
while monitoring gas pressure. The unit
should shut down and fault on "LOW GAS
PRESSURE" at 6" W.C.
Figure 6.1
1/8” Pipe Plug Position for Manometer
Installation
7. Fully open the manual gas shut-off valve.
8. Depress the low gas pressure switch reset
button and clear the annunciator display.
9. The unit should restart.
NOTE:
After faulting the unit, the fault message will
be displayed and the fault indicator light will
flash until the CLEAR button is pressed.
6.3 LOW WATER LEVEL FAULT TEST
1. Place the ON/OFF switch in the OFF
position.
2. Close shut-off valves in the supply and
return piping to the unit.
3. Slowly open the drain valve on the unit.
4. Allow air flow into the unit by either opening
the relief valve or by removing the 1/4” plug
in the head of the pressure vessel.
5. The LOW WATER LEVEL message will be
displayed and the fault LED will flash after
the water level has gone below the level of
the probe.
Summary of Contents for Benchmark G-00-711
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