LAARS Mighty-Stack TL80-199 - Installation, Operation and Maintenance Instructions - Manual (Page 14)

LAARS Heating Systems Company
Page 14
SECTION 2.
Operating Instructions
•
Water temperature over 125°F (52°C)
can cause severe burns instantly or
death from scalds.
•
Children, disabled and elderly are at
highest risk of being scalded.
•
See instruction manual before setting
temperature at heating appliance.
•
Feel water before bathing or
showering.
•
If this appliance is used to produce
water that could scald if too hot, such
as domestic hot water use, adjust the
outlet control (limit) or use
temperature limiting valves to obtain a
maximum water temperature of 125°F
(52°C).
WARNING
Should overheating occur or the gas supply fail to
shut off, turn off the manual gas control valve to the
appliance.
WARNING
Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to replace the appliance.
2A. Starting the System
1. Close the manual gas valve located outside the
water heater. Turn on the power to the unit
(make sure the toggle switch is either in the up or
down position). The pump should come on
immediately. Check to be sure that the pump is
operating properly. If it does not, test the
electrical circuits.
2. Before you open the gas supply valve, please
read the safety instructions at the end of this
section. These are very important. The burner in
this unit does not require manual lighting. The
pilot is controlled by a hot-surface proven-pilot
ignition system (see Figure 16).
3. Open the gas supply valve. The pilot and main
burners will light automatically if the tank
aquastat is calling for heat.
DANGER
4. The aquastat is located near the lower left-hand
corner of the unit, behind the cabinet door (see
Figure 2). The aquastat is adjusted to its lowest
temperature setting when the unit is shipped
from the factory.
5. In general, set the aquastat to the lowest setting
which will produce water of an acceptable
temperature. This will give the most efficient
operation of the water heater.
6. Once the heater is running, check the appearance
of the burner flames (see Figure 15). The burners
are located behind a cover on the front of the unit
(see Figure 2). If the flame has “sooting” tips,
check for debris near the orifices. If the orifices
are plugged, call a service technician to correct
the problem.
Figure 15. Flame Patterns.