Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
Page
80
of
192
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0082_0J
05/21/2014
Ph.: 800-526-0288
GF-130
6.4 LOW WATER LEVEL FAULT TEST
To simulate a low water level fault, proceed as follows:
Low Water Level Fault Test
1. Set the
ON/OFF
switch to the
OFF
position
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. Place the unit in the Manual Mode and raise the valve position above 30%.
6. Set the
ON/OFF
switch to the
ON
position. 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.
7. Close the drain and pressure relief valve used in draining the unit.
8. Open the water shut-off valve in the return piping to the unit.
9. Open the water supply shut-off valve to the unit to refill.
10. After the shell is full, press the
LOW WATER LEVEL RESET
button to reset the low
water cutoff.
11. Press the
CLEAR
button to reset the
FAULT
LED and clear the displayed error
message.
12. Set the
ON/OFF
switch to the
ON
position. The unit is now ready for operation.
