36
adequate combustion air ow or ue gas ow. e IBC will be
automatically reset aer een (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 o
and back on again. If the boiler cannot be restored to normal
operating conditions by resetting the control, contact a qualli-
ed service agency to check the heat exchanger ue-ways for
blockage.
e dra inducer (blower) provides a means for pulling com-
bustion air into and through the mixer, the burner, the ue
ways of the cast aluminum boiler sections and the ue 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.
Every forced hot water system requires at least one circulat-
ing pump. e circulating pump imparts the necessary energy
to move the water through the closed loop supply and return
piping systems, terminal heating equipment (i.e. nned tube
radiators, etc.) and back through the boiler for reheating. To
provide the required hot water ow 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. e 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.
e 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.
is 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.
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. e furnished relief valve will automatically open at
30 psig pressure to relieve the strain on the boiler and heating
system from the increasing pressure. e 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. specications. Failure to provide the pressure relief
valve with piping as herein described may cause water damage
and/or serious bodily injury. e boiler manufacturer is not
responsible for any water damage or personal injury.
is boiler is equipped with a blocked vent safety shuto
means, which shuts o main burner gas in the event that the
ow of combustion products through the ueways is reduced.
In the event of blocked ueways, 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 ow
(aer 3 trials for ignition). e “PURGE” diagnostic indicator
lamp (lamp “B” on the IBC, see Figure16) will blink indicat-
ing the failure mode as a lack of adequate air ow. e IBC is
manually reset from lockout by either removing and reestab-
lishing the thermostat’s call for heat, or by turning the service
switch o, then back on. If the boiler cannot be restored to
normal operating condition by resetting the control, contact a
qualied service agency to check heat exchanger ueways for
blockage.
For installations where there is no oor drain or other appro-
priate drainage receptacle available to receive condensate from
the boiler, an external oat activated condensate pump with in-
tegral sump is required. is 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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