AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 74)

CHAPTER 6: SAFETY DEVICE TESTING
Page 74 of 162 PR2: 05/09/12
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
1. Disable the blower output drive voltage as follows:
(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 OFF is displayed, then press the ENTER key.
2. Start the unit in the Manual Mode at a valve position between 25% and 30%.
3. The unit should shut down and execute an IGNITION RETRY cycle by performing the
following steps:
(a) The unit will execute a 30 second re-ignition delay and display WAIT RETRY
PAUSE.
(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. See Figure 6-a or 6-1b to locate the SSOVs for each fuel type. The proof of closure
switch connections are located under the actuator cover of each SSOV as shown in Figure 6-4.
The proof of closure switch circuit is checked as follows:
1. Set the unit’s ON/OFF switch to the OFF position.
2. Place the unit in Manual Mode and set the valve position between 25% and 30%