Weil-McLain 550-141-826/1201 - Manual (Page 32)

SERVICE TECHNICIAN ONLY — read and follow completely.
Manual reset
temperature switch
Thermostat
44156
Close clearance installation
Substitute these instructions for corresponding material in
manual. All other procedures and practices must remain the same.
Recommended service and minimum clearances shown on
page 8 should be used where possible. Where closer clearances
are required:
• Top of boiler — If less than 24" available, provide removable
surface to allow for cleaning boiler flueways.
• Right or left side — Minimum 2 inches.
• Front — Minimum 2 inches from burner.
• Double-wall flue pipe to combustible surface — as listed in
Table 5, page 33 and Figure 24 through Figure 26, page 33.
Jacket cap must be in place on boiler to avoid requir-
ing an 9" minimum clearance from back or top of
boiler to combustible material. Flue pipe clearances
must take precedence over jacket clearances.
1. Install boiler using clearances described at left.
2. Install barometric control 18-20 inches from boiler in
breeching.
3. Attach manual reset temperature switch near upper surface
of enclosed area. See Figure 22.
4. Wire switch in series with thermostat. See Figure 23.
5. Provide two combustion/ventilation openings when install-
ing in confined space. Size opening 140 sq. in. (1000 Btu)
per 1 GPH input. Locate openings near top and bottom of
enclosed space.
Burner adjustments for packaged and
non-packaged boilers
Final burner adjustments must be made using com-
bustion test equipment to assure proper operation.
Do not fire boiler without water or sections will
overheat.
1. Refer to burner manual for start-up.
2. Allow boiler to heat to design condition.
3. Using combustion test equipment, adjust burner for:
a. CO2 between 11% and 12% and 0 smoke.
b. -0.01” to -0.02” W.C. draft in combustion chamber.
To provide close clearances as described on pages 26 and 27:
Obtain the Close Clearance Kit, Weil-McLain Part No. 386-500-050. Install the kit as described below. Failure to use
kit or install as described can result in a fire hazard, causing severe personal injury, death or substantial property
damage.
Figure 23 Manual reset temperature switch wiring
Area above boiler
Bracket
1 to 5
inches
Manual reset
temperature
switch
Figure 22 Manual reset temperature switch location
Combustible surface
#6 X ½" Phillips
Sheet metal
screw
#10 X ½" Phillips
sheet metal screw
Close clearance installation
Part number 550-141-826/1211 32
GOLD
WGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —
Boiler Manual