LAARS SUMMIT SMW-250 - Install and Operating Manual - Manual (Page 21)

SUMMIT BOILER OR WATER HEATER Page 21
Ignition will not occur as the gas is off. The
display will eventually show [LO]
approximately 10 seconds after the gas
valve has closed on the third ignition
attempt.
(c) Open gas shutoff valve. Press reset button
on the top of the control panel. The ignition
sequence will start again and the burner
will start. The appliance will return to its
previous mode of operation.
Caution
Should any odor of gas be detected, or if the gas
burner does not appear to be functioning in a normal
manner, close main shutoff valve, do not shut off
switch, and contact your heating contractor, gas
company, or factory representative.
10. Check burner input. Appliance should be in
operation for 5 minutes before checking input
and all other appliances served by the gas meter
should be shut off. With the burner operating at
full input, determine the time required for the
gas meter to deliver one cubic foot (CF) of gas.
The time should be between 14.1 and 14.7
seconds for appliances operating on natural gas.
For appliances operating on propane, the time
should be between 35.3 and 36.7 seconds. Most
propane installations do not have a gas meter. If
no meter exists and the CO
2
or O
2
is within
specification, the input will be correct. If
adjustments are required, see Section 7.2.2.1 –
Offset and Throttle Adjustment.
6.5 Mode and On/Off Buttons Operation
The on/off button is used to switch the appliance
from standby [ON] to standby [OFF] and vice versa. It
is NOT an isolation switch. The mode button accesses
all other functions as shown in Figure 19.
6.6 Common Vent Test
SMB-200/250 Boilers
When an existing boiler is removed from a
common venting system, the common venting system
is likely to be too large for proper venting of the
appliances remaining connected to it.
At the time of removal of an existing boiler, the
following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances
remaining connected to the common venting system
are not in operation.
1.
Seal any unused openings in the common
venting system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine there is
no blockage or restriction, leakage, corrosion
and other deficiencies which could cause an
unsafe condition.
3. Insofar as it is practical, close all building doors
and windows and all doors between the space in
which the appliances remaining connected to the
common venting system are located and other
spaces of the building. Turn on clothes dryers
and any appliance not connected to the common
venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they
will operate at maximum speed. Do not operate a
Identifies
Appliance Discharge Temp
(Supply)
On
Off
Lock Out
Third Failure (Failure Level)
Fault Code (Three) There are 7
different Fault Codes defined.
Low Water Temperature
To read or change mode
During operation display will default to supply
temperature.
Appliance in standby mode: will operate on call for
domestic water or heat zone demand.
Appliance switched OFF. Press ON/OFF button for “ON”.
After three trials for ignition, will stand in lockout. Press
reset on top of panel to retry.
Fault codes in memory apply to only to past failure
conditions and are not indicative of current failure
condition.
Fault code pertaining to current failure
condition will be displayed on readout prior to entering
memory. To monitor, press and hold temperature button
for five seconds. Display will indicate first of eight fault
memories (FL1). Then display one of seven fault
conditions that occurred previously. Display will sequence
through the eight memories (see Section 8.3 for fault
codes).
Sensor has detected return temperature below 39°F (4°C).
Figure 19. Typical Display Identification Codes.
Message