Safety device testing – AERCO BMK 3.0 LN Nat. Gas June 2010 User Manual

Page 50

SAFETY DEVICE TESTING

3. Close the manual gas shutoff valve located

between the Safety Shut-Off Valve (SSOV)
and the Air/Fuel Valve (see Figure 6-3).

MANUAL GAS

SHUTOFF VALVE

HANDLE

SSO

AIR

INLET

AIR/FUEL

VALVE

BLOWER

GAS

INLET

PARTIAL LEFT SIDE VIEW

O F

BLOCKED

INLET

SWITCH

BLOWER PROOF

SWITCH

Figure 6-3

Manual Gas Shut-Off Valve Location

4. Set the ON/OFF switch to the ON position to

start the unit.

5. The unit should shut down after reaching the

Ignition cycle and display FLAME LOSS
DURING IGN.

6. Open the valve previously closed in step 3

and press the CLEAR button.

7. Restart the unit and allow it to prove flame.

8. Once flame is proven, close the manual gas

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

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

9. Open the valve previously closed in step 8.

10. Press the CLEAR button. The unit should

restart and fire.

6.8 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.

6-4