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SlimFit
COMMERCIAL CONDENSING GAS
Startup — fill the system
Freeze protection (when used)
Follow these guidelines to prevent pos-
sibility of severe personal injury, death
or substantial property damage:
freeze-prevention fluids recommended
by Weil-McLain for application in Slim-
Fit Boiler systems.
new SlimFit boiler.
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.
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
automatic fill,
tection fluid may leak before the water
begins to leak, causing concentration
to drop, reducing the freeze protection
level.
. Antifreeze moves more
sluggishly than water and can interfere
with heat transfer. At antifreeze concen-
trations higher than 50%, sludge can
develop in the boiler, potentially causing
damage to the heat exchanger.
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 inhibi-
tors.
Use only antifreeze recommended by
Weil-McLain.
Weil-McLain provides information for
application of the antifreeze products
listed in this document only for use in
Weil-McLain SlimFit boilers. Do not
apply these products or instructions
for other applications. Local codes may
require a backflow preventer or actual
disconnection from city water supply.
78
-
FIRED WATER BOILER
,
. Use only
before installing the
for the fluid used with
. Glycol concentration
. Freeze pro-
.
—
Boiler Manual Series 2
(continued)
noticeable air flow is present. Close the zone isolation valves and proceed
with the next zone. Follow this procedure until all zones are purged.
7. Close the quick-fill water valve and purge valve and remove the hose.
Open all isolation valves. Watch that system pressure rises to correct
cold-fill pressure.
8. After the system has operated for a while, eliminate any residual air by
using the manual air vents located throughout the system.
9. 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.
10. Open automatic air vent (diaphragm-type or bladder-type expansion
tank systems only) one turn.
11. Starting on the lowest floor, open air vents one at a time until water
squirts out.
12. Repeat with remaining vents.
13. Refill to correct pressure.
Use inhibitor supplied with boiler
1. The SlimFit boiler is shipped with Sentinel X100 inhibitor and Sen-
tinel inhibitor test kit. See Repair Parts at the end of this manual for
re-ordering information.
2. After filling the system as directed in these instructions, use a caulking
gun to inject the X100 inhibitor into the system, following the instruc-
tions on the tube.
3. Inject all of the inhibitor supplied with the boiler. Allow time for the
water to circulate and mix. Then check the inhibitor level. Add addi-
tional inhibitor if necessary.
Check/verify water chemistry
1. The system may have residual substances that could affect water
chemistry.
2. After the system has been filled and leak tested, verify water pH and
chlorine concentrations are acceptable.
3. Verify antifreeze concentration, when used.
4. Follow the instructions on the Sentinel test kit to sample the system
water and verify inhibitor concentration.
Check inhibitor and antifreeze concentrations
annually
1. Test the pH of a sample of system water at least annually. The pH of
the water mixture must be between 7.0 and 8.5. (Or use the Sentinel
inhibitor test kit to check concentration.)
2. If pH is outside this range (or inhibitor test kit indicates low level), the
inhibitor level may not be sufficient to prevent corrosion.
3. Test antifreeze concentration.
Test antifreeze concentration at least annually. If concentra-
tion is low, add antifreeze or drain system and refill with
correct mixture. Follow instructions on page 77 to determine
amount of antifreeze needed.
4. Check inhibitor level after adjustments are made.
Part number 550-100-162/0815
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