AERCO BMK 1.5 LN Dual Fuel Jan 2009 - Manual (Page 47)

SAFETY DEVICE TESTING
10. The fault message should clear and the
FAULT indicator should go off. The unit
should restart.
11. Upon test completion, close the ball valve
and remove the manometer. Replace the
1/8“ plug removed in step 2.
6.6 LOW WATER LEVEL FAULT TEST
To simulate a low water level fault:
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 firing rate 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.
6.7 WATER TEMPERATURE FAULT
TEST
A high water temperature fault is simulated by
adjusting the automatic over-temperature switch.
This switch is accessible from the front of the
unit as shown in Figure 6-2.
VFD
ADJUSTABLE
TEMPERATURE
LIMIT SWITCH
MOUNTING
PLATE
RESET BUTTON FOR
MANUAL RESET
TEMPERATURE
LIMIT SWITCH
SEE
DETAIL “A”
DETAIL “A”
FRONT VIEW
Figure 6-2
Temperature Limit Switch Setting
6-3