LAARS Mighty Therm HH-PH (Sizes 175-400) - Installation, Operation and Maintenance Instructions - Manual (Page 21)

Mighty Therm HH-PH Hydronic Boilers Page 21
b. Flame is not lifting off the burner ports
4. Inspect the venting system for blockage, leakage,
and corrosion at least once a year.
5. Keep the equipment area clear of combustible
material, gasoline, and other flammable liquids
and vapors.
6. Be sure all combustion air and ventilation
openings are not blocked.
7. Check for black carbon soot buildup on the
external surfaces of the heat exchanger every 6
months. If cleaning is necessary, see the
instructions in this section.
8. On a unit with the optional low water cutoff,
check the device to be sure it is functioning
correctly.
9. Do not use the boiler if any part has been under
water. Replace any part of the gas control and
control system, or any tile material or insulation
which has been under water.
4B. Replacement of Gas Controls
WARNING
Never attempt to repair the gas valve. Such
attempts will void the warranty, and could lead to
dangerous results.
If the gas valve is found to be defective, replace
it by following these instructions:
1.
Turn all electrical power to the boiler OFF.
2. Turn off the main gas supply at the manual gas
cock or the gas meter.
3. Remove the front access door on the boiler.
4. Turn OFF the gas valve to the boiler following
the shut-down instructions found on the inside of
the boiler.
5. Disconnect the service union in the gas line, and
unscrew the main gas pipe from the gas valve
(see Figure 32).
6. Remove the two screws that fastens the anti-
rotation bracket on the left side of the gas valve
(see Figure 32).
7. Remove the pilot gas line and thermocouple
shield, if present, from the gas valve.
Caution
Label all wires before disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
3E. Shut-Down Procedure
Shut the boiler down following the instructions
found on the inside of the boiler.
Where there is a danger of freezing, shut off the
water supply and remove the drain plugs on both sides
of the boiler jacket. Drain every part of the system
subject to damage from freezing temperatures.
SECTION 4.
Service Instructions
4A. Regular Inspection
NOTE: After installation and first startup, check
the heat exchanger for black carbon soot buildup after
the following periods of operation: 24 hours, 7 days,
30 days, 90 days, and once every 6 months thereafter.
If cleaning is necessary, see the instructions in this
section.
1.
Oil the water circulating pump in accordance
with the manufacturer’s instructions.
2. If a strainer is used in a pressure reducing valve
or in the piping, clean it every 6 months in
accordance with the manufacturer’s instructions.
3. At startup and every 6 months after, look at the
pilot and main burner flame (see Figure 31). Use
inspection mirror. Characteristics of a good
flame are:
a.
Blue in color
Figure 32. Burner Removal and Gas Valve.
Caution
Since some leak test solutions (including soap and
water) may cause corrosion or stress cracking,
rinse the piping with water after testing.