MagnaTherm Boilers and Water Heaters
Page 81
WARNING
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.B.2 Combustion Setup Procedure
See the detailed instructions in Section 9.11.
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.C Shutting Down the Unit
Thisstepmustbeperformedbyaqualified
service person.
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. If freezing is anticipated, drain the unit 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.D Restarting the Unit
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.B 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.B.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. It may be neccesary to reset
the low pressure switch.
4.
The unit 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 unit.
Check that there is proper supply of gas. Wait
five minutes and start the unit again.
5.
If ignition starts normally, leave the unit 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.
