Part number 550-142-903/1016
59
Eliminate all system leaks. Continual fresh makeup
water will reduce boiler life. Minerals can build up
in sections, reducing heat transfer, overheating cast
iron, and causing section failure.
Clean system to remove sediment
1. You must thoroughly flush the system (without boiler con-
nected) to remove sediment. Sediment can affect chemical
treatment of the system and can damage system components.
2. For zoned systems, flush each zone separately through a purge
valve. (If purge valves and isolation valves are not already
installed, install them to properly clean the system.)
3. Flush system until water runs clean and you are sure piping
is free of sediment.
Water chemistry
Softened water maybe used to fill boiler providing
Sentinel X100 is added to the system at the proper dos-
age and properly maintained. Without Sentinel X100,
softened water MUSTNOT be used or boiler corrosion
may occur.
7ATERCHEMISTRYMUSTBEWITHINTHELIMITSLISTEDIN
THEFOLLOWING
. If the water differs in any way, consult a
water treatment company to set up a treatment program
to control the system water within these limits at the
time of initial fill and throughout system operating life.
Failure to maintain water chemistry as specified can
result in damage to the boiler and system components,
resulting in potential for severe personal injury, death
or substantial property damage.
7ATERP( -INIMUM\-AXIMUM
1. Maintain boiler water pH between 7.0 and 8.5. Check with
litmus paper or have chemically analyzed by water treatment
company.
(ARDNESS -AXIMUMGRAINSPERGALLON
1. The water hardness must comply with the maximum value
above. High hardness will cause scale accumulation.
#HLORINE -AXIMUMPPM
1. Filling with chlorinated fresh water should be acceptable since
drinking water chlorine levels are typically less than 5 ppm.
2. Do not use the boiler to directly heat swimming pool or spa
water.
3. Do not fill boiler or operate with water containing chlorine
in excess of 200 ppm.
Antifreeze
1. Use only antifreeze listed by Weil-McLain as suitable for use
with GV90+ boilers. A list of approved antifreeze products
is available at www.Weil-McLain.com.
&IGURE Freeze protection guidelines
GV90+ Series 2 GAS-FIRED WATER BOILER — Boiler Manual
Freeze protection (when used)
Follow these guidelines to prevent possibility of
severe personal injury, death or substantial prop-
erty damage:
.%6%2USEAUTOMOTIVEORSTANDARDGLYCOLANTI
FREEZE,EVENGLYCOLMADEFORHYDRONICSYSTEMS.
Use only freeze-prevention fluids recommended
by Weil-McLain for application in GV90+ Boiler
systems.
4HOROUGHLY mUSH ANY SYSTEM THAT HAS USED
GLYCOL before installing the new GV90+ boiler.
2EVIEWTHEMATERIALSAFETYDATASHEET-3$3
for the fluid used with the boiler owner and leave a
copy for reference. The MSDS contains informa-
tion on potential hazards and first aid procedures
for exposure or ingestion.
#HECKANTIFREEZEINHIBITORLEVELATLEASTANNU
ALLY
. Glycol concentration and inhibitor levels may
change over time. Add antifreeze to increase con-
centration if necessary. Add inhibitor as needed
to bring to acceptable level, using inhibitor test kit
to verify.
When using freeze protection fluid with auto-
matic fill,
INSTALLAWATERMETERTOMONITORWATER
MAKEUP. Freeze protection fluid may leak before
the water begins to leak, causing concentration to
drop, reducing the freeze protection level.
$/ ./4EXCEED ANTIFREEZE BYVOLUME.
Antifreeze moves more sluggishly than water and
can interfere with heat transfer. At antifreeze con-
centrations higher than 50%, sludge can develop
in the boiler, potentially causing damage to the
heat exchanger.
#LEAN THE SYSTEM BEFORE lLLING. Always drain
and flush the system thoroughly before filling with
antifreeze. Sludge, iron oxide deposits and other
sediment in the system inhibit flow and can cause
rapid breakdown of inhibitors.
434!4#)2#LIGHTmASHINGALONE
Usually indicates return water temperature sensor
detects water at boiler return pipe less than 40°F.
Both internal circulators will run continuously,
even with no call for heat, until temperature rises.
Start-up
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