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Page 106
11.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.
11.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 into 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 unit. The ignition sequence will start again
and the burner will start. The unit will return to its
previous mode of operation.
LAARS Heating Systems
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.
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.
11.C Shutting Down the Unit
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 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.
11.D Restarting the Unit
If the system has been drained, see 11.A for instructions
on proper filling and purging.
1.
Turn off the main electrical disconnect switch.
2.
Close all manual gas valves.
Wait five minutes.
3.
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.
WARNING
WARNING
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