Camus Hydronics DFH1100 Installation, Operation And Service Manual - page 22
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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.
4.9
CHRM, FLOW and PRESSURE DROP
Figure 12 – Secondary Heat Exchanger
Table 11 – CHRM Head Loss & Flow for 10 ºF Rise
Model US
GPM ΔP - Ft.
500 10.0 0.4
750 13.0 0.7
1100 22.0
1.8
1200 24.0
2.1
1500 30.0
3.1
1750 35.0
4.2
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
4500 *52.0 14.0
5000 *57.0 16.5
*Flow for 15°F rise at high fire
4.10
WATER FLOW SWITCH (shipped loose)
A water flow switch is shipped loose and is to be installed in
the outlet piping on all heating boilers and hot water supply
boilers. The flow switch is wired in series with the 24VAC
safety control circuit. A diagnostic light will be indicated on
the control display on a low flow condition.
4.11
LOW WATER CUTOFF (If Equipped)
If this boiler is installed above radiation level, a low water
cut-off device must be installed at the time of boiler
installation. Some local codes require the installation of a
low water cut-off on all systems. Electronic low water cut-
offs are available as a factory supplied option on all models.
Low water cut-offs should be tested every six months. The
normally open switch contact of the low water cutoff is to be
wired in series with the flow switch. A diagnostic light will be
indicated on the control display on a low flow condition.
Caution
: remove jumper when connecting to 24 VAC
circuit.