Burnham Apex APX399 Installation, Operating And Service Instructions page 102

Xi. Service and Maintenance
CaUTiOn
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
4. Remove the igniter assembly and flame sensor and
inspect them for oxide deposits. Clean the oxide deposits
from the igniter electrodes and flame sensor rod with
steel wool. Do not use sandpaper for the cleaning.
Inspect the ceramic insulators for cracks and replace
the igniter assembly and/or flame sensor if necessary.
Check the igniter electrode spacing gap. Refer to Figure
58 "Igniter Electrode Gap" for details.
Figure 58: igniter Electrode gap
5. To gain access to boiler burner and combustion chamber
firstly disconnect and remove gas inlet piping from
gas valve, than, remove six M6X1 hex flange nuts and
take out the blower/gas valve/burner assembly from
the boiler.
6. Inspect the assembly for lint and dust presence. If
significant lint and dust accumulations are found,
disassemble the blower/gas valve assembly to expose the
swirl plate and blower inlet (see the exploded diagram
in the parts list at the back of this manual). Vacuum
these parts as required, being careful not to damage
the vanes on the swirl plate.
7. Vacuum any dust or lint from the burner if present. If
the burner shows any visual deterioration or corrosion
signs, replace it immediately. Inspect the burner gasket
and replace, if necessary.
8. Inspect the heat exchanger combustion chamber, clean
and vacuum any debris found on the surfaces. If
required, brush the coils of the heat exchanger using
a non-metal wire flexible brush. Any cleaning of the
combustion chamber with acid or alkali products
is prohibited. Remove insulation disc and clean the
surfaces by flushing with clean water. If the disc has
signs of damage, it must be replaced. Drain and flush the
inside of the heat exchanger and condensate collector.
Do not use any cleaning agents or solvents. Re-install
insulation disc upon cleaning completion..
9. Inspect the condensate trap to verify it is open and free
from debris. Inspect condensate line integrity between
boiler and condensate neutralizer (if used), condensate
neutralizer and the drain. Clean/repair if needed.
102
(continued)
10. Inspect the flue temperature sensor cap to verify that
11. Inspect vent connections and vent connector to heat
12. Reinstall the gas valve/blower/burner assembly and
13. Reconnect any wiring which has been disconnected.
14. Inspect the heating system and correct any other
15. Follow Section IX "System Start-up" before leaving
16. Perform the combustion test outlined in Section IX
17. Verify that the system PH is between 7.5 and 9.5.
18. Check for vent terminal obstructions and clean as
D.
If the condensate neutralizer is used, check pH before
and after the neutralizer to determine neutralizing
effectiveness. Replace limestone chips and clean out
the neutralizer if needed.
it is free from leakage and deterioration, replace, if
needed.
exchanger seals to verify that they are free from leakage
and deterioration, repair as needed.
secure with M6X1 hex flange nuts.
deficiencies prior to restarting the boiler.
installation.
"System Start-up".
necessary.
Recommended Heating System Water Treatment
Products:
1. System Cleaning and Conditioning:
a. The following heating system water treatment
products are recommended for an initial existing
heating system sludge removal, initial boiler
cleaning from copper dust, flux residue and any
boiler debris and for preventive treatment as
corrosion/scale inhibitors:
i. Fernox™ Restorer (universal cleaner, sludge
remover, scale remover, flux residue/debris
remover, corrosion inhibitor)
ii. Fernox™ Protector (Alphi 11, CH#, Copal)
(sludge remover, corrosion inhibitor)
Follow manufacturer application procedure
for proper heating system/boiler cleaning and
preventive treatment.
Above referenced products are available
from Cookson Electronics Company, 4100
Sixth Avenue, Altoona, PA 16602, Tel: (814)
946-1611 and/or selected HVAC distributors.
Contact Burnham Commercial for specific
details.
iii. Equivalent system water treatment products
may be used in lieu of products referenced
above.
2. System Freeze Protection:
a. The following heating system freeze protection
products are recommended for Apex boilers: