![background image](http://html2.mh-extra.com/html/watts/aerco-bmk-750/aerco-bmk-750_operation-and-service-manual_3787105034.webp)
Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 3 - START SEQUENCE
OMM-0145_A99
• GF-218 • 9/18/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
34
of
157
Start Sequence
Figure 3-1e: BMK5000-6000: SSOV Location
3. The Auxiliary Delay occurs for a configurable length of time and the Delayed Interlocks are closed.
4. Once all required safety device switches are closed, a purge cycle is initiated and the following
events occur:
a. The Blower relay energizes and turns on the blower.
b. The Air/Fuel Valve rotates to the full-open purge position and closes purge position
switch. The dial on the Air/Fuel Valve (Figure 3-2a and 3-2b) will read
100
to indicate
that it is full-open (100%).
c.
The
Fire Rate
bargraph on the Controller’s front face shows 100%.
Figure 3-2a: BMK750 & 1000 Air/Fuel Valve in Purge Position
STEPPER MOTOR
TO
BLOWER
AIR INLET
100
UPSTREAM
SSOV
TO AIR/FUEL
VALVE
GAS INLET
MANUAL SHUT-
OFF VALVE
DOWNSTREAM
SSOV WITH
POC
HIGH GAS
PRESSURE SWITCH
- BMK6000
:
10.5” W.C., 2.6 kPa
- BMK5000
:
11.0” W.C., 2.7 kPa
UPSTREAM LOW GAS
PRESSURE SWITCH
- BMK6000
:
8.5” W.C., 2.1 kPa
- BMK5000
:
8.0” W.C., 2.0 kPa