LAARS SUMMIT SMW-250 - Install and Operating Manual - Manual (Page 25)

SUMMIT BOILER OR WATER HEATER Page 25
7.2.9 Cleaning the Primary Heat
Exchanger Coil
The SUMMIT appliance is equipped with a
premixed combustion system. This type of
combustion system does not create free carbon (soot)
except in very rare instances and therefor the
combustion chamber coil will probably never need
cleaning. If cleaning is required, proceed as follows:
Turn off gas to the boiler, switch off the electrical
power at the disconnect switch. Remove blower and
burner. Use a compressed air source with a tube
attached that is capable of being inserted though the
hole from which the burner was removed and blow off
all loose matter. Use proper eye protection and
breathing apparatus to prevent injury from projected
particles and dust. When finished cleaning with the
compressed air, use a ‘shop vac’ to remove loose
debris.
After cleaning, assemble the parts in the reverse
order, open isolation valves and bleed air from the
boiler and the system. Follow the lighting instructions
and start the boiler. Check operation.
Note: The Warranty does not cover damage
caused by lack of required maintenance, lack of
water flow, or improper operating practices.
Fouling on the external surfaces of the heat
exchanger is caused by incomplete combustion, and is
a sign of venting and/or combustion problems. If
major cleaning is required the most cost effective
procedure is to replace the combustion coil assembly.
The vent system should be inspected at the same time.
7.2.10 Burner
If cleaning is required, remove blower and
burner. Burner may be cleaned by blowing off the
outside surface with compressed air and wiping with a
clean lint free rag. When replacing, install new
gaskets.
7.2.11 Vent Terminals
If cleaning is indicated by a build up of foreign
matter on the vent screens, clean with a brush and
remove all loose material.
7.2.12 Condensate Collection System –
Inspection and Cleaning
Visually inspect the condensate drain lines. If
either clear plastic line appears to be full of
condensate (water), loosen the nut on the appliance
jacket that retains the line and remove the line from
the fitting. Remove the obstruction from the line,
replace the line and tighten fitting.
7.2.13 Routine Deliming Procedure –
SMW-200/250 Water Heater
WARNING
Use proper protective equipment as specified by the
supplier of the deliming solution when performing
this procedure.
In hard water areas, the following procedure
should be done on a regularly scheduled basis:
1. Close the gas cock or manual gas shutoff and
shutoff the main disconnect switch.
2. Isolate the SUMMIT water heater from the
system by closing the shutoff valves. If
recirculation lines are piped into the system they
must be isolated from the SUMMIT water heater
also.
3. Remove the front panel from the appliance and
connect a hose to the drain fitting (located under
the cylindrical chamber). Relieve pressure at
drain.
4. Connect a hose to the drain fitting provided by
the installer at installation (located on the return
line from the tank adjacent to the appliance.
5. Remove cover from Mixing Valve and remove
thermostat. Wrap tape over and around cutaway
sections of the mixing valve cover and replace
all parts except the thermostat. Replace cover
and tighten bolts.
6. Fill the Primary Heat Exchanger Coil with
deliming solution using the hose connected
under the cylindrical chamber. Use a small pump
to do the filling from a plastic container and fill
until the solution exits from the other hose
previously installed. This hose should be
elevated above the mixing valve at this time.
Once solution starts to exit this hose, place it in
the plastic container with the other hose and
allow the solution to circulate until the solution
is no longer foamy.
7. Shut off the pump and carefully disconnect it
from the hose. Carefully drain solution from
both hoses. Connect city water to the hose that
was connected to the pump and flush for 5
minutes to remove residual solution. Remove
hoses and restore mixing valve to it’s original
condition (remove tape, install thermostat and
other internal valve parts). Open all valves, bleed
air from appliance and restart.