LAARS Mighty Therm AP (Sizes 500-1825) - Installation, Operation and Maintenance Instructions - Manual (Page 15)

Mighty Therm Commercial Pool Heating Boiler Page 15
Section 4
Maintenance
1. Inspect the pump seal every 6 months. Replace the
pump if the seal shows signs of leakage or wear.
2. At start-up and every six (6) months thereafter, the
pilot and main burner fl ame should be observed for
proper performance (see Figure 16). See attached
lighting and shut-down instructions for proper
pilot fl ame pattern. If fl ame has the appearance of
"sooting" tips, check for debris near orifi ces and
call the Laars Service Department.
3. Inspect the venting system for obstruction, leakage
and corrosion at least once each year.
4. Keep heater area clear and free from combustible
material, gasoline and other fl ammable vapors and
liquids (see Table 1 for minimum clearances).
5. Be certain all combustion air and ventilation
openings in the room are unobstructed.
6. Check for fouling on the external surfaces of
the heat exchanger every six months. (NOTE:
after installation and fi rst start-up, check the heat
exchanger for fouling after the following periods of
operation: 24 hours, 7 days, 30 days, 90 days and
once every six months thereafter.)
Fouling on the external surfaces of the heat
exchanger is caused by incomplete combustion and
is a sign of combustion air and/or venting problems.
As soon as any fouling is observed, the cause of
the fouling should be corrected (see Section 5,
Troubleshooting Guide). The heat exchanger can
be checked with a fl ashlight by locating a mirror
under the burners. An alternate method is to remove
the venting and top panels as necessary to inspect
the heat exchanger from above. Also check the
vent system for defects at this time. (If cleaning is
required, shut off all electrical and gas supply to the
heater.)
7. To expose the heat exchanger:
Indoor Models: Remove the fl ue pipe, top of unit,
rear upper jacket, fl ue collector rear panel and heat
exchanger baffl es.
Outdoor Models: Remove vent top assembly,
rear upper jacket, fl ue collector rear panel and heat
exchanger baffl es.
8. To remove all burners:
It is usually more convenient to remove the burner
tray assembly. Disconnect sensor wire, ignition
cable (or thermocouple generator) and pilot gas line.
Disconnect manifold inlet union(s). Remove the four
(4) retaining screws. Grasp the manifold pipe and
slide out the burner tray.
Figure 16 - Main Burner Flame Pattern
Caution
Black carbon or green soot on a dirty heat
exchanger can, under certain conditions, be
ignited by a random spark or open fl ame. To
prevent this unlikely occurrence, dampen the
soot deposits with wet brush or fi ne water
spray before servicing or cleaning the heat
exchanger.
9. Clean heat exchanger using a wire brush to remove
soot and loose scale from the unit. Clean fallen
debris from bottom of heater. Make sure burner
ports are clear and pilot assembly is free of debris.
10. Reassemble in reverse order and be sure the heat
exchanger baffl es are replaced.
11. The gas and electric controls installed on the heater
are engineered for both dependable operation
and long life, but the proper functioning of these
components is necessary for safe operation of the
heater. It is strongly recommended that the basic
items be checked by a competent serviceman
every year and replaced when necessary. The basic
controls are:
a. Water temperature controls.
b. Pilot safety system.
c. Automatic electric gas valve(s)
d. Flow switch.
12. Low water cutoffs should be inspected every six (6)
months, when provided.
NOTE: The warranty does not cover any damage
caused by lack of required maintenance or improper
operating practices.
13. Pool Water Chemistry
Maintain the pool water chemistry in accordance
with generally accepted principles in the swimming
pool industry as stated by NSPI, the CDC or your
local codes.