AERCO BMK 1.5 LN October 2012 - Manual (Page 70)

CHAPTER 6
SAFETY DEVICE TESTING
Page 70 of 166 AERCO International Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288 PR1:10/18/12
Benchmark 1.5LN Low NOx Boiler
Installation, Operation and Maintenance Manual
GF-120
OMM-0041 0E
Figure 6-1: Low & High Gas Pressure Testing
Fully open the external manual gas shut-off valve and press the CLEAR button on the 7.
Control Box.
The fault message should clear and the FAULT indicator should go off. The unit should 8.
restart.
Upon test completion, close the ball valve and remove the manometer. Replace the 1/4“ 9.
plug removed in step 1.
6.3 HIGH GAS PRESSURE TEST
To simulate a high gas pressure fault, refer to Figure 6-1 and proceed as follows:
Remove the 1/4“ plug from the leak detection ball valve shown in Figure 6-1. 1.
Install a 0 – 16” W.C. manometer (or W.C. gauge) where the 1/4” plug was removed. 2.
Slowly open the leak detection ball valve 3.
Start the unit in Manual mode at a valve position (firing rate) between 25 and 30%. 4.
Slowly increase the gas pressure using the adjustment screw on the SSOV. 5.
TO
AIR/FUEL
VALVE
GAS INLET
SSO
RSI
SOLENOID
VALVE
RSI BLEED-
OFF VALVE
1/4” NPT PLUG
(INSTALL
MONOMETER HERE
FOR RSI PRESSURE
TEST/CALIBRATION)
MANUAL SHUT-
OFF VALVE
RSI
PRESSURE
REGULATOR
HIGH GAS
PRESSURE
SWITCH
1/4” NPT PLUG
(INSTALL
MONOMETER HERE
FOR HIGH GAS
PRESSURE TEST)
HIGH GAS BALL
VALVE
LOW GAS
PRESSURE
SWITCH
RSI GAS
VALVE
1/4” NPT PLUG
(INSTALL
MONOMETER HERE
FOR LOW GAS
PRESSURE TEST)