8
Consult vent pipe manufacturer’s instructions for
proper method of sealing vent pipe sections and
fittings. In the absence of instructions, make
sure that pipe and fittings are clean by swabbing
with alcohol. Use Dow Corning 736 or 732 RTV,
Polybar # 500 RTV or Sil-bond 4500 or 6500 to
seal vent pipe. Do not use other sealants or
adhesives except as expressly permitted by vent
manufacturer’s instructions.
Consult vent pipe manufacturer’s instructions for
vent system assembly. Follow vent pipe
manufacturer’s instructions if those instructions
differ from this section.
Conventional Venting
Multiple appliances may be vented into a
conventional chimney. The chimney must be
lined with AL29-4C or equivalent and a single
acting barometric damper must be provided for
each appliance. Vent diameters are to be
increased by one size over the recommended
size downstream of the barometric damper.
A qualified professional using a proven vent-
sizing program with input of accurate operating
parameters must properly calculate sizing of the
venting system. In applications where flue gas
temperatures are lower than can support a
Category II with conventional negative draft, it
will be determined at the venting design stage
that a positive pressure will be developed in the
vent. It will then be necessary to either provide
separate vents as for Category IV, to pressurize
the boiler room, or to provide an extractor at the
chimney outlet in order to maintain a negative
draft in the chimney and allow common venting.
The chimney must be protected from down
drafts, rain and debris by using a listed chimney
cap. Approval of the installation will be at the
discretion of authorities having jurisdiction.
Sidewall and Vertical Venting
The maximum vent length is 100 equivalent feet.
Vent pipe may be run through a vertical or
horizontal chase provided that minimum
clearances to combustible materials are
maintained. The vent should terminate a
minimum 12 inches above grade plus normally
expected snow accumulation, or 7 feet above
grade if located adjacent to public walkways. Do
not install over public walkway where local
experience indicates condensation or vapour
from the boiler creates a nuisance or hazard.
Minimum 3 feet above any forced air inlet
located within 10 feet of vent termination.
Minimum 4 feet below, 4 feet horizontally or
above any door window or gravity air inlet.
Minimum 4 feet horizontally from electric meters,
gas meters, regulators and relief valves. Use
appropriately designed thimbles when passing
through combustible walls or roofs. Install fire
stops where vent passes through floors, ceilings
or framed walls. The fire stop must close the
opening between the vent pipe and the
structure. Locate vent terminal above
combustion air intake terminal (if used) and no
closer than 2 feet vertically or horizontally.
Vertical venting requires flashing and a storm
collar to prevent moisture from entering the
structure. Vertical vent termination must be at
least 2 feet plus the expected snow
accumulation above the roof penetration height.
Figure 4 – Secondary Heat Exchanger
Table 5 – CHRM Head Loss & Flow for 10
o
F Rise
Model
US GPM
∆
P - Ft.
2000
40.0
5.5
2500
50.0
8.0
3000
60.0
11.5
3500
40.0*
8.5
4000
46.0*
11.0
*Flow for 15°F rise at high fire
.
Summary of Contents for MicoFlame Grande MFH2000
Page 14: ...12 Figure 7 Typical Heating System Figure 8 Typical Low Water Temperature System...
Page 15: ...13 Figure 9 Typical Instantaneous Water System Figure 10 Typical Water Heating System...
Page 16: ...14 Figure 11 Typical Water Heating System...
Page 30: ...28...
Page 31: ...29...
Page 32: ...30 16 EXPLODED VIEW MicoFlame Grande...
Page 33: ...31 17 EXPLODED VIEW MicoFlame Grande Outdoor and or Condensing...