50
GAS-FIRED BOILER Boiler Manual
PART 9. START-UP PREPARATION (CONTINUED)
5. The system may have residual substances
that could affect water chemistry. After the
system has been filled and leak tested, verify
water pH and chlorine concentrations are
acceptable.
D. PURGE AIR FROM WATER SYSTEM
1. Purge air from system:
a. Connect a hose to the purge valve and
route hose to an area where water can
drain and be seen.
b. Close the boiler or system isolation valve
between the purge valve and fill
connection to the system.
c. Close zone isolation valves.
d. Open quick-fill valve on cold water make-
up line.
e. Open purge valve.
f. One zone at a time, open the isolation
valves. Allow water to run through the
zone, pushing out the air. Run until no
noticeable air flow is present. Close the
zone isolation valves and proceed with
the next zone. Follow this procedure until
all zones are purged.
g. Close the quick-fill water valve and purge
valve and remove the hose. Open all
isolation valves. Watch that system
pressure rise to correct cold-fill pressure.
It is recommended that you put the
pumps into manual operation to assist in
purging the circuits.
h. Disconnect the wires that are connected
to the THERMOSTAT terminals of the cus-
tomer connection board. Apply power to
the boiler. The display will show the tem-
perature of the water in the boiler. Press
the {S1/
-
} and {S3} keys simultaneously and
hold for 1 second. The Display will begin
alternating between SEP and CH and the
Central Heating pump will come on. If you
then press the {S2/+} key the Central heat-
ing pump will shut off, the display will
begin alternating between SEP and DH
and the DHW pump will come on. If the
boiler is set up as the cascade master and
you press the {S2/+} key again, the DHW
pump will shut off, the display will begin
alternating between SEP and Sh and the
system pump will come on. Using the
{S1/
-
} and {S2/+} keys in this manner you
can toggle between running each pump in
the system as required to help bleed out
all entrapped air. Some good indicators
that air is removed include the absence of
gurgling noises in the pipes and pump op-
eration becoming very quiet. Pressing
{S1/
-
} and {S2/+} together at any time will
return the boiler control to normal opera-
tion.
i. After the system has operated for a
while, eliminate any residual air by using
the manual air vents located throughout
the system.
j. If purge valves are not installed in
system, open manual air vents in system
one at a time, beginning with lowest
floor. Close vent when water squirts out.
Repeat with remaining vents.
k. Refill to correct pressure.
E. CHECK FOR GAS LEAKS
n
WARNING
Before starting the boiler, and during initial
operation, smell near the floor and around the
boiler for gas odorant or any unusual odor.
Remove boiler front door and smell interior of
boiler enclosure. Do not proceed with startup if
there is any indication of a gas leak. Repair any
leak at once.
n
WARNING
Eliminate all system leaks. Continual fresh
make-up water will reduce boiler life. Minerals
can build up in the heat exchanger, reducing
heat transfer, overheating heat exchanger, and
causing heat exchanger failure.
n
CAUTION
It is important that you purge the system of air
to avoid damage to the boiler.
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