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

Page 52

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SAFETY DEVICE TESTING

6-6

4. Initiate a unit start sequence.

5. The unit should begin it’s start sequence,

then shut down and display PRG SWITCH
OPEN DURING PURGE.

STEPPER

MOTOR

DIAL

17

2

17

1

16

9

17

0

IGNITION

POSITION

SWITCH

PURGE

POSITION

SWITCH

AIR

IN

TO

BLOWER

6. Replace the wire on the Purge Switch and

depress the CLEAR button. The unit should
restart.

6.11 IGNITION SWITCH OPEN DURING
IGNITION

The Ignition Switch (and the Purge Switch) is
located on the Air/Fuel Valve. To check the
switch, proceed 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%.

3. Remove the Air/Fuel Valve cover (Figure

6-5) by rotating the cover counterclockwise to
unlock and lift up to remove.

Figure 6-6

Air/Fuel Valve Purge and Ignition Switch

Locations

4. Remove one of the two wires (#169 or #170)

from the Ignition Switch (Figure 6-6).

5. Initiate a unit start sequence.

6. The unit should begin its start sequence and

then shut down and display IGN SWITCH
OPEN DURING IGNITION.

6.12 SAFETY PRESSURE RELIEF
VALVE TEST

Test the safety Pressure Relief Valve in
accordance with ASME Boiler and Pressure
Vessel Code, Section VI.

7. Replace the wire on the Ignition Switch and

press the CLEAR button. The unit should
restart.

AIR/FUEL VALVE COVER

(ROTATE CCW TO REMOVE)

Figure 6-5

Air/Fuel Valve Cover Location