Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0119_0A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
79
of
170
GF-130-I
Ph.: 800-526-0288
11/03
/2016
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.
6.8.1 Blower Proof Switch Test
Blower Proof Switch
Test
1.
Disable the blower output drive voltage as follows:
(a) Press the
MENU
key until
CONFIGURATION MENU
is displayed.
(b)
Press the ▲ arrow key until the
ANALOG OUTPUT
function is displayed, then
press the
CHANGE
key.
(c)
Press the ▼ arrow key until
OFF
is 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 lockout, showing
AIRFLOW FAULT DURING PURGE
in
the display.
4.
The unit should perform one IGNITION RETRY cycle and then shut down, since the
blower is disabled. The unit will then display
AIRFLOW FAULT DURING PURGE.
5.
Re-enable the blower output drive voltage by performing the following steps:
(a) Press the
MENU
key until
CONFIGURATION MENU
is displayed.
(b)
Press the ▲ arrow key until the
ANALOG OUTPUT
function is displayed, then
press the
CHANGE
key.
(c)
Press the ▲ arrow key until
VALVE POSITION 0-10V
is displayed, then press the
ENTER
key.
(d) Press the
CLEAR
button to clear the airflow fault.
6.
Once the unit has proved flame, turn off the blower again by going to the
Configuration
menu,
Analog Output
menu item and select
OFF
.
7.
The Blower Proof switch will open and the blower should stop. The unit should shut
down and display
AIRFLOW FAULT DURING RUN
.
8.
Go to the
Configuration
menu,
Analog Output
item and select
VALVE POSITION 0-10v
.
6.8.2
Blocked Inlet Switch Test
This test will be run in simulated fire mode, with the Blocked Inlet switch isolated from the rest of
the control circuitry.
Blocked Inlet Switch
Test
1.
Turn the main ON/OFF switch on the front of the Control Panel to the
OFF
position.
2.
Remove the air filter (see Figure 6-3, above).
