Weil-McLain 2 Series Manual page 79

®
SlimFit Series 2
Startup — fill the system
Clean system to remove sediment
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, following
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.
use petroleum-based cleaning or sealing com-
Do not
pounds in the boiler system. Damage to elastomer
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 instructions.
Failure to comply could result in boiler failure or unreli-
able operation.
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 treat-
ment 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 properly main-
tained. 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 550-100-180/0917
COMMERCIAL CONDENSING GAS
(without
- — Boiler Manual
FIRED WATER BOILER
Antifreeze with Inhibitor
Use only antifreeze listed by Weil-McLain as suitable
for use with SlimFit Gas Boilers. See additional require-
ments 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 dis-
tributor.
Use the correct amount of antifreeze
1. Determine the
against lowest likely temperature the system water will encounter).
2. Find the antifreeze percentage
needed for this temperature from the antifreeze manufacturer's
data on the antifreeze container.
antifreeze.
3. Calculate the
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 requirements
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 system 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 proceed-
ing further.
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.
(to protect
(concentration by volume)
concentration of
(gallons) of all system piping and
. Continual fresh make-
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