AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 76)

CHAPTER 6: SAFETY DEVICE TESTING
Page 76 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
6.13 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.
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.
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
STEPPER
MOTOR DIAL
172
171 169
170
IGNITION
POSITION
SWITCH
PURGE
POSITION
SWITCH
AIR
IN
TO
BLOWER
Figure 6-6: Air/Fuel Valve Purge and Ignition Switch Locations
6.14 SAFETY PRESSURE RELIEF VALVE TEST
Test the safety Pressure Relief Valve in accordance with ASME Boiler and Pressure Vessel
Code, Section VI.