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MODU-FIRE® FORCED DRAFT
Gas-Fired Boiler Maintenance
5.1.4 Annually
In addition to the recommended monthly service:
1. Check burner and wash off (do not scrub or use
wire brush) any soot or foreign material that may
have accumulated. See Section 5.2 on "Cleaning
the Burner." Check the burner and its parts. If
there is evidence of deterioration or corrosion,
replace immediately.
2. Inspect combustion chamber. To access the
heat exchanger, remove the front door and the
front inner wrapper. Note any signs of deterio-
ration. Examine the gasket and replace if neces-
sary, using P-K gasket kit only.
3. Inspect and clean heat exchanger. Wash the
copper tubes with water and non corrosive soap.
Green scale on the tubes indicates that the boiler
is condensing which is detrimental to boiler life.
Perform corrective action as necessary.
4. Examine the venting system.
a. Check all joints and pipe connections for
tightness.
b. Check vent for corrosion or deterioration. If
any venting needs replacing, do so immedi-
ately.
5. Inspect heating system for other problems.
6. Perform combustion analysis and adjust if nec-
essary (See 3.12.3).
7. Leak test gas valves. Leak Test must be per-
formed only by qualified PK certified personnel,
who have been trained in this procedure. This
procedure is available on request from the PK
Factory.
5.2
CLEANING THE BURNER
Burner Assembly
Air-Gas
Mixing Head
1. WARNING! Follow proper lockout / tagout pro-
cedures for the electrical, gas, and water connec-
tions. Use caution when lifting heavy parts.
2. Remove top and side covers from the boiler.
3. Disconnect the gas union, high gas pressure
switch wires and the wire plug connector to the
blower. Disconnect the UV scanner, ignition
wire, ground wire and the wires to the back pres-
sure switch.
5. Disconnect the air gas mixer sensing tubes.
Note: these tubes are color coded and must be
correctly reinstalled.
6. Remove the blower/air gas mixer assembly from
the top of the burner.
7. Clean the blower vanes. Do not disassemble the
blower motor or aluminum housing.
8. Remove the burner using the four hold down
screws.
9. Check burner and wash off (do not scrub or use
wire brush) any soot or foreign material that may
have accumulated.
Blower
Ignition Assembly
Burner Grid
25