High Gas Pressure Test; Low Water Level Fault Test - Watts AERCO CFR 1500 Operation And Service Manual

SECTION 5 SAFETY DEVICE TESTING

5.3 High Gas Pressure Test

To simulate a high gas pressure fault, refer to Figure 4-1
1. Shut off the external gas supply by closing the external gas supply ball valve.
2. Locate the port on the side of the High Gas Pressure switch and loosen the screw in the port to
open it. Do not completely remove the screw. Alternatively, you can remove the 1/4-inch plug
shown in Figure 4-1
3. Attach one end of the plastic tubing to the port or barb fitting and the other end to a 0 – 16" W.C.
(0 – 4.0 kPa) manometer.
4. Remove cover from High Gas Pressure switch and set dial indicator to 3.5" (this is the maximum
allowed high gas pressure switch setting).
5. Open the external gas supply ball valve upstream of the unit.
Main Menu → Diagnostics → Manual Mode
6. Go to:
7. Use the + (Plus) and – (Minus) controls to bring the unit up to 100%.
8. Slowly increase manifold gas pressure by turning Gas Pressure Adjustment Screw in Downstream
SSOV (see Figure 4-1) while reading CO level on the combustion analyzer. Adjust manifold pressure
until either the unit shuts down due to a gas pressure fault, OR, the CO reading reaches 250 ppm,
whichever happens first.
Note the number of turns you make, as you will turn it back to its original position later.
9. If CO reads 250 ppm before the unit shuts down due to a gas pressure fault, slowly turn the
indicator dial on the High Gas Pressure switch until the unit shuts down. This is the setpoint.
10. Press the RESET button on the High Gas Pressure switch (in the center of the dial).
11. Readjust the manifold gas supply pressure to what it was before it was increased in step 9.
12. Press the CLEAR button on the Edge Controller to clear the fault.
13. Fire the unit back up to ensure gas pressure out of the SSOV is set as it was originally.
14. Upon test completion, close the ball valve and remove the manometer fitting from the port, and
then turn the port screw clockwise till the port is closed.

5.4 Low Water Level Fault Test

1. Set the Controller's Enable/Disable switch to Disable.
2. Close the water shut-off valves in the supply and return piping to the unit.
3. Slowly open the drain valve on the rear of the unit. If necessary, the unit's relief valve may be
opened to aid in draining.
4. Continue draining the unit until a Low Water Level fault and the FAULT indicator flashes.
5. On the Controller, go to:
6. Enable the Manual Run control.
7. Raise the valve position above 30% using the + (Plus) and – (Minus) controls.
8. Set Enable/Disable switch to Enable. The READY light should remain off and the unit should not
start. If the unit starts, shut it off immediately and refer to service personnel.
•
: and install a hose barb fitting in that location.
Main Menu → Diagnostics → Manual
•
and perform the following steps:
:
and enable Manual Mode.
Mode.
•