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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
WARNING
Electrical Shock Hazard.
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
Au moment de l´entretien des commandes,
étiquetez tous les fils avant de les débrancher.
Les erreurs de câblage peuvent nuire au bon
fonctionnement et être dangereuses.
S´assurer que l´appareil fonctionne
adéquatement une fois k´entretien terminé
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 11-1
“Igniter Electrode Gap” for details.
Figure 11-1: Igniter Electrode Gap
5. To gain access to boiler burner and combustion
chamber, first disconnect and remove gas inlet
piping from gas valve. Then, remove six M6X1
hex flange nuts and take out the burner/blower/
gas valve assembly from the boiler. To prevent
stud breakage, apply a generous amount of good
quality penetrating oil to nuts and let it soak in
prior to attempting nut removal.
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. For parts
identification, refer to Section 13 “Service Parts”.
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-abrasive, non-metal bristle
brush. Any cleaning of the combustion chamber
with acid or alkali products is prohibited. Do not
use any cleaning agents or solvents. If insulation
disc has signs of damage, it must be replaced.
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.
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.
10. Inspect vent connections and vent connector to
heat exchanger seals to verify that they are free
from leakage and deterioration. Repair as needed.
Follow all instructions in Section 4 “Venting” when
reassembling vent system.
11. Check for vent and air intake terminal for
obstructions and clean as necessary. Check
screens in vent and air intake terminations to verify
they are clean and free of debris.
WARNING
Failure to properly secure the burner/blower/
gas valve assembly to the heat exchanger could
lead to property damage, personal injury or
death.
12. Reinstall the burner/blower/gas valve assembly
and secure with M6X1 hex flange nuts.
13 . Reconnect any wiring which has been disconnected.
14. Verify that the system pH is between 7.5 and 9.5.
15. Inspect the heating system and correct any other
deficiencies prior to restarting the boiler.
16. Follow Section 9 “System Start-up” before leaving
installation.
17. Perform the combustion test outlined in Section
9 “System Start-up”.
D. 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)
11 Service and Maintenance (continued)
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