CHAPTER 6: SAFETY DEVICE TESTING
Page
70
of
158
PR2: 04/22/13
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
(b) The unit will then execute a standard ignition sequence and display
WAIT
IGNITION RETRY
.
4. The unit should perform one
IGNITION RETRY
cycle and then shut down, since the
blower is disabled. The unit will then display
AIRFLOW FAULT DURING PURGE.
5. Re-enable the blower output drive voltage by performing the following steps:
(a) Press the MENU key until
CONFIGUR-ATION MENU
is displayed.
(b)
Press the ▲ arrow key until the
ANA-LOG OUTPUT
function is displayed, then
press the
CHANGE
key.
(c)
Press the ▲ arrow key until
VALVE POSITION 0-10V
is displayed, then press
the
ENTER
key.
6. Once the unit has proved flame, turn off the blower by going to the Configuration Menu,
Analog Output
menu item and select
OFF
.
7. The Blower Proof Switch will open and the blower should stop. The unit should shut
down and display
AIRFLOW FAULT DURING RUN
.
8. Go to the Configuration Menu,
Analog Output
item and select
VALVE POSITION 0-10v
.
9. Press the
CLEAR
button. The unit should restart.
10. Next, check the Blocked Inlet Switch by first noting the current position of the Iris Air
Damper and then closing the Damper to position 8.
11. .The unit should shut down and again display
AIRFLOW FAULT DURING RUN
.
12. Return the Iris Air Damper to its previous setting.
13. Press the
CLEAR
button. The unit should restart.
6.11 SSOV PROOF OF CLOSURE SWITCH
This test can be performed when the unit is set up to run on either natural gas or propane fuel.
Both the Natural Gas and Propane SSOVs contain proof of closure switches which are wired in
series.
1. Set the unit’s
ON/OFF
switch to the
OFF
position.
2. Place the unit in Manual Mode and set the valve position to 34%.
3. Refer to Figure 6-1 and locate the Natural Gas SSOV.
4. Remove the cover from the SSOV by loosening the screw shown in Figure 6-4. Lift off
the cover to access the terminal wiring connections.
5. Disconnect wire #148 from the SSOV to “open” the proof of closure switch circuit.
6. The unit should fault and display
SSOV SWITCH OPEN.
7. Replace wire #148 and press the
CLEAR
button.
8. Set the
ON/OFF
switch to
ON
to restart the unit.
9. Remove the wire again when the unit reaches the purge cycle and
PURGING
is
displayed.
10. The unit should shut down and display
SSOV FAULT DURING PURGE.
11. Replace wire #148 on the SSOV and press the
CLEAR
button. The unit should restart.
