LAARS Mighty Max HH (Sizes 320M - 400M) - Installation, Operation and Maintenance Instructions - Manual (Page 25)

Mighty Max Hydronic Boiler Page 25
4. Inspect the filter for discoloration due to
contamination or any other forms of debris. If
contamination or debris exists, wash the filter in
a soap/water solution then rinse with water only.
It is important that the filter be dry before
placing it back in the filter housing.
CAUTION
The filter has arrows which indicate the direction of
the air flow. Failure to install the filter correctly may
cause blower failure and dangerous operation.
ATTENTION
Le filtre a des flèches qui indiquent la direction de
l’air. Si le filtre n’est pas installé correctement, le
souffleur peut ne pas fonctionner, ce qui serait
dangereux.
The filter must be inspected for contamination
one week after start-up. Depending upon the severity
of contamination, a suitable cleaning schedule may be
developed. The factory recommends cleaning the filter
at least once every 30 days. In high contamination
areas, such as construction sites, factories, etc., the
filter may need to be cleaned daily. Failure to do so
could result in lower heat output and potential unsafe
operation.
SECTION 5.
Troubleshooting
5.1 Sequence of Operation
To troubleshoot the heater properly you must
first understand the sequence of operation of the
heater:
1. Upon a call for heat a 24 Vac signal is sent
through fusible links and high limit(s) to the
ignition control “TH” terminal.
4.2.2b. Cleaning the Heat Exchanger -
Internal
1. Remove the inlet/outlet header of the heat
exchanger.
2. Remove the return cover of the heat exchanger.
3. Clean the internal surface. (Laars offers a tube
cleaning kit part no. R00100000.)
4. Reassemble in the reverse order.
4.3 Gas and Electric Controls
The gas and electric controls on the heaters are
designed for both dependable operation and long life.
Safe operation of the heater depends on their proper
functioning. A professional service technician should
check the following basic items every year, and
replace when necessary.
NOTE: the warranty does not cover damage caused
by lack of required maintenance or improper
operating practices.
1. Water temperature controls.
2. Ignition control system.
3. Automatic electric gas valve(s).
4. Flow sensing safety device (when used).
5. Low water cutoffs, including flushing or float
types. (Every six months)
Other maintenance requirements include:
1. Periodic cleaning of filters, when supplied.
2. Lubrication of moving parts (when applicable),
with the correct type and amount of lubricant.
3. Periodic examination of the venting system.
4. Periodic cleaning of vent terminal screens, where
applicable.
5. Cleaning flue gas passageways.
4.4 Filter
4.4.1 Filter Function
A filter has been designed into the operation of
this Mighty Max boiler. Its function is to filter the
combustion air before it is delivered to the burner
system. The filter is manufactured out of a
polyurethane foam and may be cleaned with a mild
soap and water solution. Clean the filter only after the
filter has been removed from the filter housing (see
Figure 19).
4.4.2 Filter Service
(The filter does not need cleaning if this is a first
time heater start-up).
1.
Turn the heater off using the toggle switch.
2. Remove the door panel and bonnet from the
jacket.
3. Remove the screws on the filter housing to
expose the filter as shown in Figure 19.
Figure 19. Filter Exposed for Cleaning.
FILTER
ARROW
OUT OF
PRODUCTION