LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 67)

MagnaTherm Boilers and Water Heaters Page 63
Caution
If any odor of gas is detected, or if the gas
burner does not appear to be functioning
in a normal manner, close the main gas
shutoff valve
. Do not shut off the power
switch. Contact your heating contractor, gas
company, or factory representative.
10.2.2 Combustion Setup Procedure
See the detailed instructions in Section 9.10.
WARNING
Improper adjustment may lead to poor
combustion quality, increasing the amount of
carbon monoxide produced. Excessive carbon
monoxide levels may lead to personal injury or
death.
10.3 Shutting Down the MagnaTherm
This step must be performed by a qualified
service person.
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. If freezing is anticipated, drain the
MagnaTherm and be sure to also protect
the building piping from freezing. All water
must be removed from the heat exchanger or
damage from freezing may occur.
10.4 Restarting the MagnaTherm
If the system has been drained, see Section 10.1 for
instructions on proper filling and purging.
1.
Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3.
Wait five minutes.
4. Set the aquastat or thermostat to its lowest
setting.
5. Open all manual gas valves.
6. Reset all safety switches (pressure switch,
manual reset high limit, etc.).
7. Set the temperature controller to the desired
temperature setting and switch on the electrical
power.
8. The unit will go through a prepurge period and
ignitor warm-up period, followed by ignition.
10.2 Initial Operation
The initial setup must be checked before the unit is
put into 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.
10.2.1 Initial Burner Operation
1. Using this manual, make sure the installation
is complete and in full compliance with the
instructions and all local codes.
2. Determine that the unit 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 the unit.
4. The MagnaTherm will enter the start sequence.
The blower and pump will energize for pre-
purge, then the ignition sequence will start.
After all safety devices are verified, the gas
valve will open. If ignition doesn’t occur,
turn off the MagnaTherm. Check that there is
proper supply of gas. Wait five minutes and
start the unit again.
5. If ignition starts normally, leave the
MagnaTherm turned on.
6. After placing the unit in operation, the Burner
Safety Shutoff Device must be tested:
(a) Close the gas shutoff valve with the
burner operating.
(b) The flame will go out, and the blower will
continue to run for the post purge cycle.
A few additional attempts to light will
follow including pre-purge, ignitor on,
valve/flame on and post purge. Ignition
will not occur because the gas is turned
off. The ignition control will lockout.
(c) Open the gas shutoff valve. Reset the
boiler control by pressing the Reset
button on the control. Restart the
appliance. The ignition sequence will
start again and the burner will start. The
appliance will return to its previous mode
of operation.