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SlimFit
®
Series 2
Startup — fill the system
Clean system to remove sediment
You must thoroughly flush the system (without
boiler connected) to remove sediment. The high-
efficiency heat exchanger can be damaged by
buildup or corrosion due to sediment.
1. If necessary, use an approved chemical cleaning agent, fol-
lowing the manufacturer's guidelines for procedures.
a. A list of approved cleaning products is available at
www.Weil-McLain.com.
b. See Replacement parts at the end of this manual for
Weil-McLain part numbers to obtain cleaning agents
through a Weil-McLain distributor.
2. For zoned systems, flush each zone separately through a
purge valve.
a. If purge valves and isolation valves are not already
installed, install them to properly clean the system.
3. Flush the system until water runs clean and you are sure all
piping is free of sediment.
Do not use petroleum-based cleaning or sealing
compounds in the boiler system. Damage to elas-
tomer seals and gaskets in the system could occur,
resulting in substantial property damage.
Before filling the boiler and system with water, verify
the water chemistry complies with these instruc-
tions.
Failure to comply could result in boiler failure or
unreliable operation.
Install a strainer or other mechanical separator
device if necessary to ensure sediment will not
enter the boiler.
Water chemistry
Water pH between 7 0 and 8 5
1. Maintain boiler water pH between 7.0 and 8.5. Test the water
with litmus paper or have it chemically analyzed by a water
treatment company.
2. If pH differs from above, consult a local water treatment
company for treatment needed.
3. Softened water may be used to fill boiler providing Sentinel
X100 is added to the system at the proper dosage and prop-
erly maintained. Without Sentinel X100, softened water must
not be used or boiler corrosion may occur.
Hardness must be less than 7 grains
1. Consult local water treatment companies for unusually hard
water areas (above 7 grains hardness).
Chlorine concentration must be
LESS THAN 200 ppm
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.
Part number 550-100-561/0224
commercial condensing gas
-
— Boiler Manual
fired water boiler
Antifreeze with Inhibitor
Use only antifreeze listed by Weil-McLain as suit-
able for use with SlimFit Gas Boilers. See additional
requirements in the antifreeze WARNING on the
next page.
1. A list of approved antifreeze products is available at www.
Weil-McLain.com.
2. See Replacement parts at the end of this manual for Weil-
McLain part numbers to obtain antifreeze through a Weil-
McLain distributor.
Use the correct amount of antifreeze
1. Determine the freezing temperature needed (to protect
against lowest likely temperature the system water will en-
counter).
2. Find the antifreeze percentage (concentration by volume)
needed for this temperature from the antifreeze manufac-
turer's data on the antifreeze container.
DO NOT exceed 50% by volume concentration of
antifreeze.
3. Calculate the total volume (gallons) of all system piping and
components, including the expansion tank and boiler.
a. Boiler water content is listed on page 116.
b. Include the expansion tank water content.
4. The gallons of antifreeze required equals the total water
volume multiplied times the antifreeze percentage required.
Fill and test water system
1. Fill system only after ensuring the water meets the require-
ments of this manual.
2. Close manual and automatic air vents and boiler drain valve.
3. Fill to correct system pressure. Correct pressure will vary
with each application.
a. Pressure will rise when boiler is turned on and sys-
tem water temperature increases.
b. Operating pressure should be no higher than 80%
of the relief valve setting for most systems.
4. At initial fill and during boiler startup and testing, check the
system thoroughly for any leaks. Repair all leaks before
proceeding further.
Eliminate all system leaks. Continual fresh make-
up water will reduce boiler life. Minerals can build up
in sections, reducing heat transfer, overheating heat
exchanger, and causing heat exchanger failure.
Purge air from water system
1. Connect a hose to the purge valve (see purge/drain valves
shown in piping diagrams beginning on page 16). Route the
hose to an area where water can drain and be seen.
2. Close the boiler or system isolation valve between the purge
valve and fill connection to the system.
3. Close zone isolation valves.
4. Open quick-fill valve on cold water make-up line.
5. Open purge valve.
6. 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.
7. Close the quick-fill water valve and purge valve and remove
the hose. Open all isolation valves. Watch that system pres-
sure rises to correct cold-fill pressure.
79
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