49
Bryan Steam, LLC
www.bryanboilers.com
Phone: 765-473-6651
783 N Chili Ave, Peru, IN 46970 [email protected]
H. Dual Fuel Free Flex 1500 - Free Flex 6000 -
Switching Fuels
1. Make sure the Boiler ON/OFF Switch (
located
on the front door
) is turned off. Failure to turn
boiler off before switching fuels can cause the
boiler to lockout.
2. The Fuel selection switch is a "
Hesitation
Switch
". Do Not Force the switch; it requires
pushing the switch to the center position,
releasing the switch, then pushing once again
towards the desired fuel source.
3. The Display will state NG for natural gas
and show a blue flame or state LP for liquid
petroleum and show a yellow flame.
I. Commissioning Free Flex 1500 - Free Flex 6000
High Turndown or Dual Fuel
Note
: Some of the listed Features may not be
currently available.
1. All steps listed in this section pertain to all high
turndown and dual fuel Free Flex 1500 - Free
Flex 6000 boilers unless specified.
2. All Commissioning and verifications are to be
to be done in "Manual Mode".
3. Menu > Operation > Auto / Manual Rate
Control > Manual (
76 password required
)
WARNING
Step 4 through Step 12 must be done as stated
for Safety,
especially
for Dual Fuel Boilers.
4. CLOSE the manual gas valve between the
automatic gas valve and the blower inlet.
5. Cycle the boiler. The boiler should lockout
on gas pressure failure. In this case it should
be the low gas pressure switch, on Free Flex
3500 - Free Flex 6000 it could be the pilot low
gas pressure switch, the main low gas pressure
switch or both.
6. Reset the low gas pressure switch, also on
the Free Flex 3500 - Free Flex 6000 reset the
pilot low gas pressure switch and reset the gas
pressure lockout.
7. Increase the high gas pressure switch setting
to 14” w.c.
8. Cycle the boiler.
a. For Free Flex 1500 - Free Flex 3000, the boiler
should lockout on flame failure or ignition
failure. (
Boiler may recycle once if there was
an ignition failure.
)
b. For Free Flex 3500 - Free Flex 6000, verify the
pilot has lit then, the boiler should lockout
on flame failure or ignition failure when
switching to main flame. (
Boiler may recycle
once if there was an ignition failure.
)
9. Reset the flame failure lockout and decrease
the high gas pressure switch setting to 1” w.c.
10. Cycle the boiler. The boiler should lockout on
gas pressure. In this case it will be the high gas
pressure switch.
11. Open the manual gas valve between the
automatic gas valve and the blower inlet.
12. Reset the high gas pressure switch and adjust to
the setting listed in the Factory Fire Test report.
Also, reset gas pressure lockout.
13.
For
Dual Fuel boilers, repeat Step 4 through
Step 12 for both Natural Gas and LP before test
firing the boiler (
See Section H for switching
fuels
).
14. The combustion curve for single or dual fuel
boilers was preloaded and verified at the
factory before shipment. (
It should not require
advance adjustments with the LMV
.)
15. The Factory Fire Test report will indicate the
SKP25 inlet and outlet gas pressures along
with the O
2
readings used to set and test the
combustion curve.
16. Cycle the boiler.
a. On Free Flex 1500 - Free Flex 3000 the boiler
should establish main flame.
b. On Free Flex 3500 - Free Flex 6000 the pilot
flame should be established and then main
flame.
17. If flame is not established reset the flame
failure lockout and repeat 16 (
Consult with
the factory for assistance if flame cannot be
established after 3 attempts
.)