Weil-McLain 2 Series Manual page 27

®
SlimFit Series 2
Venting/combustion air — options
Category II Requirements
In addition to the SlimFit boilers Category IV rating
(positive pressure, likely to condense), SlimFit boilers
are approved for Category II (negative pressure, likely
to condense) as well.
Th is new venting option includes / requires:
considered a Designed / Engineered vent system
and should be designed by a professional using ac-
cepted engineering practices in accordance to local
authority having jurisdiction.
Vertical Vent only.
system with other appliances.
Exhaust Combustion Air opening requirements on
page 31 .
for Category II Vent Connection, see Figure 96,
page 105 in this manual for approved adapters.
eter straight pipe directly aft er the SlimFit Vent/Air
adapter before any diameter or direction changes in
the vent.
pressure in the vertical vent pipe immediately fol-
lowing the boiler is between the ranges provided in
the Table 1 below, during all operating conditions
i.e., High Fire, Low Fire, etc.
boiler will shut down and recycle if it does. Th e fl ue
Table 1 Rating and Vent Data
Boiler
Model
SF1000
SF1500
SF2000
Note 1: 10" Vent adapters are required for Category II venting, see Figure 108, page 117 "Vent/air piping
components" for adapter part numbers.
Part number 550-100-180/0917
COMMERCIAL CONDENSING GAS
Stack / Vent
Input À RZ UDWH
Btuh scfm
1,000,000 279
1,500,000 418
2,000,000 558
-
FIRED WATER BOILER
gas temperature should typically be within 20°F of the return
water temperature of the boiler. If there is the potential for a
wide variation in return water temperatures, the lowest possible
temperature should be used for any calculations.
Stack / Vent Flow Rate for each individual boiler model is listed
in the table below. Th is fl ow rate is based on the unit running
at 9.25% CO and the maximum fl ue gas temperature of 216°F.
2
Th e values can vary depending on the location of the installation
and operating conditions.
for SlimFit boilers installed in a Category II confi guration. Th e
carbon monoxide detector must be wired on the same electrical
circuit as the boiler. Check your local codes for any additional
requirements of carbon monoxide detectors.
Figure 28a Venting
10" diameter straight pipe
Negative Pressure to be
maintained at
Vent Connection of the boiler
,QFKHV ZF
-0.001 to -0.100
-0.001 to -0.100
-0.001 to -0.100
— Boiler Manual
SlimFit Vent
Adapter
required for
Category II
(See Note 1)
10"
10"
10"
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