Instinct Installation Manual

CHAPTER 17 - MAINTENANCE PROCEDURES
78
WARNING
17.7. Check Ventilation Air Openings
• Verify that all ventilation openings to the mechanical
room or building are open and unobstructed.
Check the operation and wiring of any automatic
ventilation dampers.
• Check and verify the vent termination and the
combustion air intake are free of debris and obstructions.
17.8. Inspect Vent and Combustion Air Piping
• Visually inspect the venting system and combus-
tion air piping for blockage, deterioration of gas-
kets or leakage. Repair any deficiencies.
• Verify that the combustion air inlet and vent piping
is
connec t ed , sealed and pr oper ly suppor t ed .
DANGER
Failure to inspect the vent system and combustion
air inlet piping and to have any conditions repaired,
will result in serious injury, or death.
17.9. Check Boiler System
• Verify all system components are correctly installed
and operating properly.
• Check the cold fill pressure for the system. Typical
cold wat er fill pressur e is 12 psig .
• Verify the system pressure, as the unit operates at
high t emperatur e , does not ex ceed 30 psig . Ex ces -
sive pressure indicates expansion tank sizing is in-
correct or system performance problems.
• Inspect air vent and air separators in the system.
Ensure vents do not leak, replace any leaking vents.
• Verify boiler fluid pH level is between 6.0 and 8.0.
• Check and verify inhibitor /antifreeze concentration
within the boiler water meets inhibitor/antifreeze
manufacturer’s specifications.
• If necessary contact a boiler water treatment com-
pany for a chemical analysis.
17.10. Check Expansion Tank
Refer to Chapter 4 on page 15 for recommended
location of the expansion tank and air eliminators.
Closed -Type Tank:
• Ensure tank is partially filled with water leaving an
air gap as a cushion. Refer to the manufacturer’s
instruction for proper fill level.
• Ensure the tank is fitted with a device that reduces
gravity circulation of air-saturated tank water back
into the system. This device prevents air from
bubbling up through the water as it returns from
the system.
• Ensure no automatic air vents are used in the
system. This will allow air to escape from the system
instead of returning to the tank.
Diaphragm Tank:
• Ensure the system contains a minimum of one
automatic air vent. Recommended location of the
air vent should be atop an air eliminator.
• Remove the tank from the system and check the
charge pressure. For residential applications, the
char ge pressur e is t ypically 12 psig . I f tank does not
hold pressure, then the membrane is damaged and
the tank should be replaced.
17.11. Check Boiler Relief Valve
Inspect the relief valve and lift the lever to verify flow at
least annually or as recommended on the warning tag
of the valve.
Before manually operating the pressure relief
valve, ensure the discharge piping is directed to
a suitable place of disposal to avoid a potential
scald hazard. The discharge piping must be full
size without restriction and installed to permit
complete drainage of both the valve and line.
Failure to comply with this instruction can result
in substantial property damage, serious injury, or
death.
If after closing the valve, the valve fails to seat properly
or continually w eeps , r eplace the r elief valve . Ensur e
the cause of the relief valve to weep is the valve itself,
not due to system over-pressurization caused by an
expansion tank that is waterlogged or undersized.
17.12. Inspection of Ignitor
• Remove the ignitor from the burner mounting plate.
• Remove any white oxides accumulated on the
ig
nit or using fine g rit sandpaper or steel w ool . I f the
ignitor does not clean to a satisfactory condition,
r eplace the ig nit or .
• When installing the ig nit or , ensur e the gask et is in
good condition and correctly positioned. Replace
the gasket if necessary. Tighten ignitor screws in
multiple steps, alternating between the screws
to ensure proper alignment. See Section 17.24 on
page 80 for torque specifications.
CHAPTER 17