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adequate combustion air flow or flue gas flow. The IBC will be
automatically reset after fifteen (15) minutes or can be manu-
ally reset from lockout by (a) removing and reestablishing the
thermostat call for heat or (b) by turning the service switch off
and back on again. If the boiler cannot be restored to normal
operating conditions by resetting the control, contact a qualli-
fied service agency to check the heat exchanger flue-ways for
blockage.
H. Draft Inducer
The draft inducer (blower) provides a means for pulling com-
bustion air into and through the mixer, the burner, the flue
ways of the cast aluminum boiler sections and the flue adapter
before being discharged through the vent piping to the out-
doors. See applicable sections for proper sizing and installation
of combustion air and vent piping in this manual.
I. Circulator Pump
Every forced hot water system requires at least one circulat-
ing pump. The circulating pump imparts the necessary energy
to move the water through the closed loop supply and return
piping systems, terminal heating equipment (i.e. finned tube
radiators, etc.) and back through the boiler for reheating. To
provide the required hot water flow rates, the circulator pump
must be properly sized to overcome frictional losses (usually
measured in feet of water, also referred to as "pump head loss")
of the supply and return piping systems and boiler. The circula-
tor pump is furnished in a carton within the boiler cabinet
for a single zone or zone valve controlled heating system and
should be correctly located on the downstream (i.e., pump-
ing away) side of the expansion tank. For a pump controlled
system (where there is a circulator for each zone) the circulator
provided with the boiler can work for one zone. For more de-
tails on piping and circulators, see Near Boiler Piping section
of this manual.
J. Drain Valve
The manual drain valve provides a means of draining the water
in the heating system, including the boiler and hot water sup-
ply and return piping systems installed above the drain valve.
This drain valve is installed in the ¾" tapping at the bottom of
the front boiler section. Any piping installed below the eleva-
tion 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.
CONTROLS AND ACCESSORIES
K. A.S.M.E. Rated Pressure Relief Valve
Each boiler must have a properly sized and installed 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 heating system will
increase. The furnished relief valve will automatically open at
30 psig pressure to relieve the strain on the boiler and heating
system from the increasing pressure. The pressure relief valve
discharge must be piped with piping same size as the valve
discharge opening to an open drain, tub or sink, or other suit-
able drainage point not subject to freezing, in accordance with
A.S.M.E. 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.
L. Blocked Vent Safety Shutoff
This boiler is equipped with a blocked vent safety shutoff
means, which shuts off main burner gas in the event that the
flow of combustion products through the flueways is reduced.
In the event of blocked flueways, enough air will not be avail-
able to support combustion, and the S9301 Integrated Boiler
Control (IBC) will lockout due to loss of adequate air flow
(after 3 trials for ignition). The "PURGE" diagnostic indicator
lamp (lamp "B" on the IBC, see Figure16) will blink indicat-
ing the failure mode as a lack of adequate air flow. The IBC is
manually reset from lockout by either removing and reestab-
lishing the thermostat's call for heat, or by turning the service
switch off, then back on. If the boiler cannot be restored to
normal operating condition by resetting the control, contact a
qualified service agency to check heat exchanger flueways for
blockage.
M. External Condensate Pump (Optional)
For installations where there is no floor drain or other appro-
priate drainage receptacle available to receive condensate from
the boiler, an external float activated condensate pump with in-
tegral sump is required. This unit can be installed to pump the
condensate 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 condensate reservoir (sump) can
be accomplished. Use wood frame or blocks to raise boiler as
required for proper installation.
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