Installation / Operation Instruction Manual

Page 114
SECTION 11 Maintenance
a. The units controls
b. Automatic gas valve
c. Air lter
d. Pressure switches
e. Blower
f. Pump
g. Flow switch
h. Low water cuto󰀨
i. Burner
j. Heat exchanger
k. Ignitor
Do the following once every six (6) months:
1. If a strainer is employed in a pressure reducing
valve or the piping, clean it every six months.
11.A System Maintenance
Do the following once a year:
1. Lubricate all the pumps in the system, per the
instructions on the pump.
2. Inspect the venting system for obstruction or
leakage. Periodically clean the screens in the vent
terminal and combustion air terminal (when used).
3. Remove and inspect the air lter. Clean with soapy
water if needed. Be sure that lter is dry before re-
inserting back into air lter box. Replace air lter if
damaged.
4. Keep the area around the unit clear and free
of combustible materials, gasoline, or other
ammable vapors or liquids.
5. If the unit is not going to be used for extended
periods in locations where freezing normally
occurs, it should be isolated from the system and
completely drained of all water.
6. Low water cuto󰀨s should be cleaned and inspected
annually.
7. Inspect and clean the condensate collection, oat
switch and disposal system yearly.
8. Ensure that the condensate is being neutralized
properly.
9. Inspect the ue passages and clean them using
brushes or vacuums, if necessary. Sooting in
ue passages indicates improper combustion.
Determine the cause of the problem and correct it.
10. Inspect the vent system and air intake system
and ensure that all joints are sealed properly. If
any joints need to be resealed, follow venting
manufacturer’s instructions to clean and reseal
vent system.
11. The pressure relief valve should be inspected and
tested every year.
12. Once a year, the items listed below should be
inspected by a qualied service technician:
11.B Maintenance Notes
Use only genuine manufacturers replacement parts.
CAUTION
When servicing the controls, label all wires before
disconnecting them. Wiring errors can cause improper
and dangerous operation. Verify proper operation
after servicing.
WARNING
Disconnect all power to the unit before attempting any
service procedures. Contact with electricity can result
in severe injury or death.
The gas and electric controls are engineered for long
life and dependable operation, but the safety of the
equipment depends on their proper functioning.
11.B.1 Burner
Check the burner for debris. Remove the blower
assembly to access the blower adapter plate. Remove
the 4 bolts connecting the blower to the arm. Remove
the blower adapter plate to access the burner. Pull the
burner up and out. Clean the burner, if necessary, by
blowing compressed air from the outside of the burner
into the center of the burner, and wipe the inside of
the burner clean with glass cleaner. A dirty burner
may be an indication of improper combustion or dirty
combustion air. Determine the cause of the problem and
correct it. If the burner gaskets are damaged, replace
them when replacing the burner.
11.B.2 Gas Train Components
The air/gas train consists of an on/o󰀨 solenoid valve, on/
o󰀨 pressure regulating valve, fuel modulating damper,
air modulating damper and air/gas mixer. Pipe unions
are included to facilitate removal of the piping assembly,
in the event, that a component needs to be replaced.
In general, the components contain threaded pipe
connections and can be removed using standard gas
plumbing practices. Before removing components, shut
o󰀨 the power and gas supplies to the boiler.
The air and fuel dampers must be replaced as complete
assemblies. Replacement of only the actuator, in the
event of actuator failure is prohibited. The cables for
the actuator must be disconnected at the main control
panel, X54 and X53 at the Siemens LMV36 controller.
The cables cannot be disconnected at the actuator.
Care must be exercised in removing the cables from
the existing wire bundles and once new dampers are