Warning, 40 filling the boiler system, Filling the boiler system – AERCO Esteem O&M Manual User Manual
Page 46: Check low water cut-off device, Check for gas leaks, Gf-125
40
Filling the Boiler System
Check with local codes requirements for the
installation of backflow preventers or actual
disconnection from the boiler’s cold water fill
or make up water supply line.
N
OTICE
Massachusetts Code requires the in-
stallation of a backfl ow preventer if anti-
freeze is used.
Ensure the concentration of antifreeze to
water does not exceed a 50/50 ratio.
N
OTICE
System water, including additives, must
be practically nontoxic, having a toxicity
rating or Class of 1, as listed in Clinical
Toxicology of Commercial Products.
Filling the Boiler System
1. Close the boiler drain valve located on
the bottom of the unit and any manual or
automatic air vent in the system.
2. Open all system isolation valves.
3. Fill the boiler system to correct system
pressure. Correct pressure will vary with
each application.
N
OTICE
Typical residential system fi ll pressure
is 12 psi. System pressure will increase
when system temperature increas-
es. Operating pressure of the system
should never exceed 25 psi.
4. Purge air and sediment in each zone of
the boiler system through the purge valve.
Open air vents to allow air to be purged in
the zones.
5. Once the system is completely filled and
purged of all air and sediment, check the
system pressure and check/repair any
leaks.
WARNING!
U
NREPAIRED
SYSTEM
LEAKS
WILL
CAUSE
CON
-
TINUAL
MAKEUP
WATER
TO
BE
ADDED
TO
THE
BOILER
. C
ONTINUAL
MAKEUP
WATER
COULD
CAUSE
MINERAL
BUILDUP
WITHIN
THE
HEAT
EXCHANGER
,
REDUCING
THE
HEAT
TRANSFER
,
CAUSING
POSSIBLE
HEAT
BUILDUP
AND
EVEN
-
TUAL
HEAT
EXCHANGER
FAILURE
.
Check Low Water Cut-Off Device
• The Esteem 399 Low NOx is provided
with a factory installed LWCO device that
measures system pressure of more than
10 psi.
• Remove the front jacket panel and check
for continuity across the low water cut-off
device wire terminals. The contacts should
be closed when system pressure is greater
than 10 psi. See Figure 29 page 86 for loca-
tion of the LWCO.
Check For Gas Leaks
WARNING!
P
RIOR
TO
START
-
UP
AND
DURING
INITIAL
OP
-
ERATION
,
SMELL
CLOSE
TO
THE
FLOOR
AND
AROUND
THE
UNIT
FOR
GAS
ODORANT
OR
ANY
UNUSUAL
ODOR
. D
O
NOT
PROCEED
WITH
THE
START
-
UP
IF
THERE
IS
ANY
INDICATION
OF
A
GAS
LEAK
. A
NY
LEAKS
FOUND
MUST
BE
REPAIRED
IMMEDIATELY
.
WARNING!
P
ROPANE
INSTALLATIONS
ONLY
- T
HE
PROPANE
SUPPLIER
MIXES
AN
ODORANT
WITH
THE
PRO
-
PANE
TO
MAKE
ITS
PRESENCE
DETECTABLE
. I
N
SOME
CASES
THE
ODORANT
CAN
FADE
AND
THE
GAS
MAY
NO
LONGER
HAVE
AN
ODOR
.
P
RIOR
TO
START
-
UP
OF
THE
UNIT
AND
PERI
-
ODICALLY
AFTER
START
-
UP
HAVE
THE
PROPANE
SUPPLIER
CHECK
AND
VERIFY
THE
ODORANT
LEVEL
.
GF-125