Prepare Boiler - Weil-McLain SlimFit 2 Series Manual

SlimFit Series 2
®

Prepare boiler

Provide air openings to room
Air openings — General
Follow the National Fuel Gas Code - ANSI Z223.1/NFPA54 –
latest edition (U.S.) or Natural Gas and Propane Installation
Code - CAN/CSA B149.1 (Canada) and all applicable codes to
size/verify size of the combustion/ventilation air openings into
the space. See the venting instructions section of this manual
for required air openings and sizing for either direct vent or direct
exhaust installation.
Air openings — SlimFit boiler alone in boiler room
1 DIRECT VENT — For direct vent installations (air piped to
boiler), no air ventilation openings into boiler room are needed
if clearances around the SlimFit boiler are at least equal to
the SERVICE clearances shown in Figure 2, page 7. For
spaces that DO NOT supply the minimum service access
clearances, see the direct vent venting instructions in this
manual for required openings.
2 DIRECT EXHAUST — For direct exhaust installations (com-
bustion air from inside), provide air openings as specified in
the direct exhaust venting section of this manual.
Air openings — SlimFit boiler in same room with
other gas or oil-fired appliances
1 DIRECT VENT — For direct vent installations (combustion air
piped to boiler), size openings only on the basis of the other
appliances in the space. No additional air opening free area
is needed for the SlimFit boiler because it takes its combus-
tion air from outside.
For direct vent installations, when the SlimFit boiler
is located in the same room as other appliances,
provide combustion air openings correctly sized for
all appliances in the room except the SlimFit boiler.
Failure to comply with the above warnings could
result in severe personal injury, death or substantial
property damage.
10
commercial condensing gas
— Boiler Manual
-
fired water boiler
2 DIRECT EXHAUST — For direct exhaust installations, com-
bustion air openings into the room must be sized to handle the
SlimFit boiler and all other appliances. See the direct exhaust
venting instructions in this manual for required openings.
Direct exhaust installations
exhaust installations, the boiler draws com-
bustion air from the boiler room. If other appli-
ances are installed in the same room, provide
combustion air openings correctly sized for
ALL
Failure to comply with the above warnings
could result in severe personal injury, death
or substantial property damage.
Vent and air piping requirements
(page 22)
1. The SlimFit boiler requires a special vent system, designed
for pressurized venting.
a. SlimFit boilers are rated ANSI Z21.13 Category IV
(pressurized vent, likely to condense in the vent).
b. SlimFit commercial boilers can be either:
Direct-exhaust
air from inside or . . .
— both vent and air piped outside.
Direct-vent
c. See instructions beginning on page 22 for vent/air
configuration options and installation requirements.
2. Note "Prevention of combustion air contamination" on page 24
when considering vent/air terminations and boiler room condi-
tions when using inside air (direct exhaust installation).
3. Be sure to locate the boiler such that the vent and air piping
can be routed through the building and properly terminated.
The vent/air piping lengths, routing and termination method
must all comply with the methods and limits in instructions
beginning on page 29.
— On direct
appliances, including the SlimFit boiler.
— vent to the outside, combustion
Part number 550-100-561/0224