Safety device testing – AERCO BMK 3.0 LN Dual Fuel June 2010 User Manual

Page 53

SAFETY DEVICE TESTING

PARTIAL LEFT SIDE VIEW

BLOWER

AIR

INLET

BLOCKED

AIR INLET

SWITCH

AIR/FUEL

VALVE

MANUAL GAS

SHUTOFF VALVE

HANDLE

PROPANE

PART

FRAM

GAS I

LETS

NATURAL GAS

(

Figure 6-3

Manual Gas Shut-Off Valve Location

8. Once flame is proven, close the manual gas

valve located between the SSOV and the
Air/Fuel Valve.

9. The unit should shut down and execute an

IGNITION RETRY

cycle by performing the

following steps:

(a) The unit will execute a shutdown purge

cycle for a period of 15 seconds and
display WAIT FAULT PURGE.

(b) The unit will execute a 30 second re-

ignition delay and display WAIT RETRY
PAUSE.

ignition sequence and display WAIT
IGNITION RETRY

10. Since the manual gas shutoff valve is still

closed, the unit will shut down and display
FLAME LOSS DURING IGNITION

following

the IGNITION RETRY cycle.

11. Open the valve previously closed in step 8.

12. Press the CLEAR button. The unit should

restart and fire.

6.10 AIR FLOW FAULT TESTS

These tests check the operation of the Blower
Proof Switch and Blocked Inlet Switch shown in
Figure 6-3.

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.

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 two IGNITION

RETRY

cycles and then shut down on the

third successive ignition attempt. The unit will
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.

the

▲ arrow key until VALVE

POSITION 0-10V

is displayed, then

press the ENTER key.

6-5