LAARS SUMMIT SMW-250 - Install and Operating Manual - Manual (Page 20)

Page 20 LAARS Heating Systems
ignite, the burner control will lock out and
display [LO] (see Figure 19).
8. If the display remains at [OFF], press the on/off
button (located at the right of the LED display)
and the reset button on top of the control panel.
The pump and the blower will start, the display
will then successively indicate [Bft] (appliance
discharge temperature) for 1 second and the
actual temperature in degrees F for 3 seconds.
The appliance will attempt to ignite three times
after which it will lock out and display [LO].
The fan will stop and the pump will run on for a
short period and then it will stop. Ensure that the
system is fully discharged of all air and the water
charge pressure is correct.
9. Switch off the main electrical supply.
10. System is now ready for operation.
WARNING
Do not use this appliance if any part has been under
water. Immediately call a qualified service technician
to inspect the appliance and to replace any part of
the control system and any gas control that may
have been under water.
6.4 Operating the Burner and Set Up
(Refer to page 16)
The Summit condensing modulating appliance
utilizes an advanced, state-of-the-art design. Proper
setup is essential for safe and reliable operation.
Problems such as failure to start, rough ignition,
strong exhaust odors, etc. can be due to improper
setup. Damage to the boiler resulting from improper
setup is not covered by the limited warranty.
REQUIRED TOOLS:
CO
2
or O
2
Analyzer, Slope Gage, Magnehelic ® or
Minihelic ® Differential Pressure Gage capable of
reading –0.01 inches w.c., and a T-40 Torx ®
Screwdriver.
1.
Using this manual, make sure the installation is
complete and fully in compliance with the
instructions.
2. Determine that the appliance and system are
filled with water and all air has been bled from
both. Open all valves.
3. Observe all warnings on the Operating
Instructions label and turn on gas and electrical
power to appliance.
4. Switch on the appliance power switch located on
the left side of the control box.
5. If the appliance display indicates “bFt” and then
temperature, go to step 6. If the display indicates
“OFF”, depress the ON/OFF button. If the
display indicates “LO” press the reset button.
6. The Summit will enter the start sequence. The
blower and pump come on for pre-purge, then
the ignitor warmup sequence starts and finally,
the gas valve opens. If ignition doesn’t occur and
display indicates “LO”, check that there is
proper gas supply. Wait 5 minutes and depress
the reset button to re-start ignition. If ignition
still does not occur, and the display indicates
“LO”, remove the front cover and turn the
venturi throttle adjustment screw counter-
clockwise four full turns. Wait 5 minutes and
depress the reset button to restart the ignition
sequence.
7. After the appliance starts, remove the front cover
(if necessary). Remove the 1/8" NPT plastic plug
from the flue pipe and insert your CO
2
or O
2
analyzer probe. Obtain the CO
2
or O
2
reading
and compare it to the value in Table 4. Adjust
the reading to match that value. To decrease CO
2
or increase O
2
turn the venturi throttle adjusting
screw clockwise (see Figure 20 for identification
of adjustment points.) To increase CO
2
or
decrease O
2
, turn counter-clockwise. NOTE: if
adjusting procedure does not respond as
described, turn the adjusting screw clockwise
until the CO
2
values start to decrease (they will
initially increase to 11.9% for natural gas or
13.8% for LP gas, and then respond as described
above.) (If adjusting with an O
2
analyzer
disregard this note and turn screw in either
direction until the correct setting is obtained.)
After the CO
2
or O
2
has been adjusted to the
proper value, proceed to step 8.
8. Loosen the screw in the offset pressure port one
turn and push the gage hose over the port and
screw. Adjust offset pressure, if necessary, by
removing the cover over the offset pressure
adjusting screw and turning the screw until the
proper value is obtained. Obtain another CO
2
or
O
2
reading. If necessary, again adjust the CO
2
or
O
2
to the proper value as in step 7. If the offset
pressure has changed, adjust it to the proper
value. When both the CO
2
or O
2
reading and the
offset pressure reading are correct, remove hose
and tighten screw in port. Replace cover over
offset adjustment, remove sample line from flue
pipe and replace the 1/8" NPT plastic plug.
Replace the appliance front cover and check
operation.
9. After placing the appliance in operation, the
Burner Safety Shutoff Device must be tested.
To test:
(a)
Close gas shutoff valve with burner
operating.
(b) The flame indicator light will go out and
blower will continue to run for the post
purge cycle. Three additional attempts to
light will follow including pre-purge,
ignitor on, valve/flame on and post purge.