Maintenance And Cleaning - Dunkirk Q95M-200 Installation Manual

normally closed switch opens if there is a blockage
in the combustion air intake or exhaust vent pipes.
DRAIN VALVE
The manual drain valve provides a means of drain-
ing the water in the heating system, including the
boiler and hot water supply and return piping sys-
tems installed above the drain valve. This drain
valve is installed in the return piping at the bottom
front of the boiler section. Any piping installed below
the elevation of this drain valve will require additional
drain valves to be installed at low points in the piping
systems in order to drain the entire system.
ASME RATED PRESSURE RELIEF VALVE
Each boiler must have a properly sized and in-
stalled American Society of Mechanical Engineers
rated pressure relief valve. Water expands as it is
heated by the burner/boiler sections. If there is no
place for the water to expand its volume, (i.e., a
properly sized and properly functioning expansion
tank) pressure on the inside of the boiler and heat-
ing system will increase. The furnished relief valve
will automatically open at 30 psig pressure to re-
lieve the strain on the boiler and heating system
from the increasing pressure. The pressure relief
valve discharge must be piped with the same size
NOTE: Maintenance as outlined below can be performed
by the owner unless otherwise noted.
The acidic nature of flue gases condensing on the
aluminum boiler sections will cause the formation
of aluminum oxide. This oxide formation is normal,
is generally uniform throughout the boiler sections,
and represents a negligible mass of aluminum
that is consumed by oxidation during the life of the
boiler. If left unchecked, this buildup may eventu-
ally cause blockage of the flue gas passages in the
boiler sections, reducing efficiency, and ultimately
shutting down the boiler due to lack of combustion
air flow.
Regular service and maintenance by a quali-
fied service agency must be performed at least
once every 12 months to assure safe, trouble
free operation and maximum efficiency.
BEGINNING OF EACH HEATING SEASON
1. Schedule an annual service call by a qualified
service agency which includes:
pipe as the valve discharge opening to an open
drain, tub or sink, or other suitable drainage point
not subject to freezing, in accordance with ASME
specifications. Failure to provide the pressure relief
valve with piping as herein described may cause
water damage and/or serious bodily injury. The
boiler manufacturer is not responsible for any water
damage or personal injury.
EXTERNAL CONDENSATE PUMP (OPTIONAL)
For installations where there is no floor drain or oth-
er appropriate drainage receptacle available to re-
ceive condensate from the boiler, an external float
activated condensate pump with integral sump is
required. The condensate pump can be piped to
a remote tie in point to a sanitary sewer system.
For this application, the boiler must be installed so
that proper pitch of piping to the external conden-
sate reservoir (sump) can be accomplished. Use
wood frame or blocks to raise boiler as required for
proper installation.
The optional concentric vent/air intake termina-
tion utilizes a single opening per each appliance
through the wall or roof of a structure.
XII - MAINTENANCE AND CLEANING
18
CONCENTRIC VENT/AIR INTAKE
TERMINATION (OPTIONAL)
• Examining flue passages between boiler
sections, burner, and condensate lines, and
cleaning (if necessary) by following the in-
structions in "Annual Examination and Clean-
ing of Boiler Components" in this section.
• Visually inspecting the venting and air intake
system for proper operation, immediately re-
pairing or replacing any sign of deterioration
or leakage, and insuring proper reassembly
and resealing of the system.
• Checking for and removing any obstruction
to the flow of combustion air or venting of
flue gases.
• Following the instructions in Sections V and
VII of the Control Manual and Operating In-
structions (P/N# 240006104), "Putting The
Boiler In Operation" and "Checkout Proce-
dures And Adjustments."
• Visually inspecting the condensate drain line
for proper operation and checking for dete-
riorated or plugged condensate drain line.