Watts AERCO Benchmark OMM-0136 - Low Water Level Fault Test

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 5 – SAFETY DEVICE TESTING
OMM-0137_E • GF-211 • 12/13/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 68 of 153
5.4 LOW WATER LEVEL FAULT TEST
To simulate a low water level fault, proceed as follows:
LOW Water Fault Test Instructions
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 message is displayed and the
FAULT indicator flashes.
5. On the Controller, go to: Main Menu → Diagnostics → Manual Run.
6. Enable the Manual Mode control.
7. Raise the valve position above 30% using the + (Plus) and – (Minus) controls.
8. Set the Controller’s Enable/Disable switch to Enable. The READY light should remain off
and the unit should not start. If the unit does start, shut the unit off immediately and refer
fault to qualified service personnel.
9. Close the drain and pressure relief valve used in draining the unit.
10. Open the water shut-off valve in the return piping to the unit.
11. Open the water supply shut-off valve to the unit to refill.
12. After the shell is full, press the LOW WATER LEVEL – RESET button to reset the low
water cutoff.
13. Press the CLEAR button to reset the FAULT LED and clear the displayed error message.
14. Set the Enable/Disable switch to Enable. The unit is now ready for operation.