Weil-McLain SlimFit 550-750 Series 1 is a commercial condensing gas-fired water boiler that is designed for a variety of applications, including heating, cooling, and domestic hot water. The boiler is highly efficient, with an AFUE rating of up to 95%, and it is also very compact, making it ideal for installations where space is limited.
The boiler is equipped with a number of features that make it easy to use and maintain, including a digital control panel, a built-in self-diagnostic system, and a removable cleanout plate. The boiler also comes with a 10-year warranty on the heat exchanger and a 5-year warranty on all other parts.
Weil-McLain SlimFit 550-750 Series 1 is a commercial condensing gas-fired water boiler that is designed for a variety of applications, including heating, cooling, and domestic hot water. The boiler is highly efficient, with an AFUE rating of up to 95%, and it is also very compact, making it ideal for installations where space is limited.
The boiler is equipped with a number of features that make it easy to use and maintain, including a digital control panel, a built-in self-diagnostic system, and a removable cleanout plate. The boiler also comes with a 10-year warranty on the heat exchanger and a 5-year warranty on all other parts.
Part No. 550-100-161/1014
SlimFit ™ 550/750 Cleanout Plate Addendum
KEEP THIS ADDENDUM WITH BOILER MANUAL
This Addendum adds to and super cedes items in the
“SlimFit™ (previously Ultra Commercial) Boiler Manuals”
(Part Number 550-100-086) and previously released Addenda’s.
Hazard denitions
e following dened terms are used throughout these Instructions to bring attention to the presence of hazards of various
risk levels or to important information concerning the life of the product.
Indicates presence of hazards that can cause severe personal injury, death or substantial property damage.
Indicates special instructions on installation, operation or maintenance that are important but not related to
personal injury or property damage.
Disconnect power before servicing
Electrical shock hazard — Disconnect all electrical
power to the boiler before attempting maintenance
procedures. Failure to complete could result in severe
personal injury, death or substantial property damage.
1. Shut down boiler:
a. Follow “To Turn Off Gas to Appliance” instructions on
boiler and Operating instructions.
b. Do not drain boiler unless it will be exposed to freezing
temperatures. If using freeze prevention fluid in system,
do not drain.
2. Close the external manual gas valve.
3. Allow time for boiler to cool to room temperature if it has
been firing.
4. Rotate the two rotary latches on the front door. Tilt the top of
the door forward, then lift up. Use the cleanout plug in the flue
pipe to rinse debris into the condensate drain.
Remove heat exchanger cleanout plate and burner
1. Use a 13-mm wrench or socket to remove the nuts that se-
cure the heat exchanger cleanout plate to the heat exchanger
Figure 1.
2. Remove the cleanout plate. Handle the cleanout plate cord
carefully to avoid damage.
These instructions must only be used by a qualified installer/service technician. Read all instructions completely
before beginning the installation. Failure to follow all instructions can cause severe personal injury, death or sub-
stantial property damage.
Figure 1 Removing heat exchanger cover plate
Gasket
Silicone cord starts and
finishes at the top center,
add a dab of silicone over joint.
Cleanout Plate
It is recommended that you obtain a Weil-McLain Boiler Annual Maintenance Kit P/N 383-
600-079, or 383-600-040, 5-Section Complete Kit or 383-600-041, 6-Section Complete Kit
before attempting this procedure, to ensure all parts that may be needed are available.
Gas-fired water boilers
Commercial Condensing
TM
Part number 550-100-161/1014
2
SlimFit
™
550/750 – Cleanout Plate Addendum
Cleanout plate gaskets — Replace silicone cord
gasket before placing the boiler back in opera-
tion.
To install the silicone cord gasket:
When installing the silicone cord gasket, the
seam should start at the top middle of the gasket
groove. See Figure 1.
Carefully place the cord in the groove all around
the cleanout plate.
Place a dab of silicone on the seam at start and end.
See Figure 1.
Do not splice pieces together. The gasket must
be installed as one piece.
When inserting the gasket, do not stretch the cord
or stretch around corners. This could cause the
cord not to seal correctly, resulting in possible
flue gas or condensate leakage.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Figure 2 Cleaning heat exchanger with cleaning tool
Re-install cleanout plate
1. Re-install the cover plate following the sequence shown in the
appropriate illustration, Figure 3 or Figure 4, page 3.
2. Re-install the hex head nuts on the cover plate mounting
studs and tighten in the staggered pattern shown for the boiler
model (Figure 3 , or for SF-550 or Figure 4 , page 3 for SF-750)
until the cover plate is uniformly tightened.
Gradually tighten the cleanout plate nuts in the se-
quence shown. Torque to 18 N-m/160 in-lbs/13 ft-lbs.
If the tightening is not done using this top-to-
bottom, center out method, the plate could buckle,
allowing a flue gas leakage.
45° Down
Horizontal
45° Up
3. Follow the procedure on page 81 of Boiler manual to remove
the burner, piping end combustion chamber access plate and
the blower/venturi/mixing tube assembly.
The boiler contains ceramic fiber materials. Use care
when handling these materials per instructions on
page 78 of Boiler manual. Failure to comply could
result in severe personal injury.
Use heat exchanger cleaning tool
1. Use the heat exchanger cleaning tool (supplied with the boiler)
or a piece of 20-gauge or lighter sheet metal ¾” wide by about
18 inches long to loosen deposits.
2. Slide the cleaning tool through the heat exchanger pins in the
three directions shown in Figure 2.
3. Vacuum the debris out of the base through the flue inspec-
tion opening.
Water spray the heat exchanger
1. Disconnect the condensate line at the bottom of the heat
exchanger so debris will not clog the trap.
a. Loosen the hose clamps at both ends of the condensate
line.
b. Remove the line and place a pan under the trap connec-
tion.
2. Use the burner openings to spray water down onto the heat
exchanger pins. Continue spraying until all debris on the pins
has been flushed into the base.
a. Spray water into the flue inspection opening to flush
remaining sediment to the condensate outlet.
b. Spray water through the condensate line to clean it thor-
oughly.
c. Remove the pan and re-install the condensate line.
d. Re-install the flue inspection plug.
Replace cleanout plate gasket
1. Replace the red silicone cord with new from Annual Mainte-
nance kit or cover plate replacement kit.
2. Make sure any old silicone has been properly removed.
3. Make sure cover plate gasket is in the groove of the heat
exchanger.
4. When installing the silicone cord gasket, the seam should start
at the top middle of the gasket groove, see Figure 1. Place a dab
of silicone on the seam at start and end, see Figure 1.
Part number 550-100-161/1014
3
SlimFit
™
550/750 – Cleanout Plate Addendum
Re-install burner, mixing tube and blower assembly
1. Follow the procedure on page 81 of Boiler manual to re-install
the burner, and other components.
2. Reconnect wiring, including the ignitor ground wire connec-
tion to the top ignitor mounting screw.
Figure 3 Nut tightening sequence — SF-550
Gradually tighten the nuts, repeating the
sequence shown below until the torque
reaches 160 inch-pounds +/- 10 inch-pounds /
18 N-m +/- 1 N-m
18 3 5
1012
13
11
14
29 4
7
6
18 3 5
10
11
12
29 4
7
6
Figure 4 Nut tightening sequence — SF-750
Gradually tighten the nuts, repeating the
sequence shown below until the torque
reaches 160 inch-pounds +/- 10 inch-pounds /
18 N-m +/- 1 N-m
Restart and test the boiler
1. Restore gas supply and power to the boiler.
2. Start the boiler and verify operation following the procedures
given in this manual.
Perform startup and check/out
Removing and reinstalling components can change
boiler behavior.
After any maintenance procedure, you must verify
operation after servicing. To do so, follow the com-
plete procedure for boiler and system startup, be-
ginning on page 70 of the Boiler manual. Failure to
comply could result in severe personal injury, death
or substantial property damage.
Part Number 550-100-161/1014
Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
4
SlimFit
™
550/750 – Cleanout Plate Addendum
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Weil-McLain SlimFit 550-750 Series 1 User manual
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Weil-McLain SlimFit 550-750 Series 1 is a commercial condensing gas-fired water boiler that is designed for a variety of applications, including heating, cooling, and domestic hot water. The boiler is highly efficient, with an AFUE rating of up to 95%, and it is also very compact, making it ideal for installations where space is limited.
The boiler is equipped with a number of features that make it easy to use and maintain, including a digital control panel, a built-in self-diagnostic system, and a removable cleanout plate. The boiler also comes with a 10-year warranty on the heat exchanger and a 5-year warranty on all other parts.
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