Camus Hydronics DFH/W500 Installation, Operation And Service Manual

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Camus Hydronics DFH/W500 Installation, Operation And Service Manual Manual pdf 26 page image

21When supplied with the CHRM, the DynaFlame® is 95%efficient (category II or IV appliance) which requires the use ofa special venting system fabricated from AL29-4C orequivalent material. Only venting components listed by anationally recognized testing agency may be used.This appliance may be installed with conventional, sidewall orvertical venting. Conventional vented appliances operate withnegative pressure in the vent pipe and require a special ventadapter to increase the flue outlet diameter. Sidewall andvertically vented appliances operate with positive pressure inthe vent pipe and may be directly connected to the flue outletwithout the use of an increaser. Consult the vent pipemanufacturer’s instructions for minimum clearances tocombustible material for vent components. In the absence ofinstructions, the minimum clearance to combustible material issix inches.Consult vent pipe manufacturer’s instructions for propermethod of sealing vent pipe sections and fittings. In theabsence of instructions, make sure that pipe and fittings areclean by swabbing with alcohol. Use Dow Corning 736 or 732RTV, Polybar # 500 RTV or Sil-bond 4500 or 6500 to seal ventpipe. Do not use other sealants or adhesives except asexpressly permitted by vent manufacturer’s instructions.Consult vent pipe manufacturer’s instructions for vent systemassembly. Follow vent pipe manufacturer’s instructions if thoseinstructions differ from this section.Conventional VentingMultiple appliances may be vented into a conventionalchimney. The chimney must be lined with AL29-4C orequivalent and a barometric damper is to be provided asrequired for each appliance to control the draft.A qualified professional using a proven vent-sizing programwith input of accurate operating parameters must properlycalculate sizing of the venting system. In applications whereflue gas temperatures are lower than can support a Category IIwith conventional negative draft, it will be determined at theventing design stage that a positive pressure will be developedin the vent. It will then be necessary to either provide separatevents as for Category IV, to pressurize the boiler room, or toprovide an extractor at the chimney outlet in order to maintaina negative draft in the chimney and allow common venting.The chimney must be protected from down drafts, rain anddebris by using a listed chimney cap. Approval of theinstallation will be at the discretion of authorities havingjurisdiction.Sidewall and Vertical VentingThe maximum vent length is 100 equivalent feet. Vent pipemay be run through a vertical or horizontal chase provided thatminimum clearances to combustible materials are maintained.The vent should terminate a minimum 12 inches above gradeplus normally expected snow accumulation, or 7 feet abovegrade if located adjacent to public walkways. Do not installover public walkway where local experience indicatescondensation or vapour from the boiler creates a nuisance orhazard. Minimum 3 feet above any forced air inlet locatedwithin 10 feet of vent termination. Minimum 4 feet below, 4 feethorizontally or above any door window or gravity air inlet.Minimum 4 feet horizontally from electric meters, gas meters,regulators and relief valves. Use appropriately designedthimbles when passing through combustible walls or roofs.Install fire stops where vent passes through floors, ceilings orframed walls. The fire stop must close the opening betweenthe vent pipe and the structure. Locate vent terminal abovecombustion air intake terminal (if used) and no closer than2 feet vertically or horizontally. Vertical venting requiresflashing and a storm collar to prevent moisture fromentering the structure. Vertical vent termination must be atleast 2 feet plus the expected snow accumulation abovethe roof penetration height.4.9 CHRM, FLOW and PRESSURE DROPFigure 20: Secondary Heat ExchangerTable 10: CHRM Head Loss & Flow for 10oF RiseModel US GPM ∆P - Ft.500 10.0 0.4750 13.0 0.71100 22.0 1.81200 24.0 2.11500 30.0 3.11750 35.0 4.22000 40.0 5.52500 50.0 8.03000 60.0 11.53500 *40.0 8.54000 *46.0 11.04500 *52.0 14.05000 *57.0 16.54504 *52.0 14.05004 *57.0 16.56004 *68.0 25.0*Flow for 15°F rise at high fire4.10 WATER FLOW SWITCH (shipped loose)A water flow switch is shipped loose on copper and coppernickel heat exchangers and is to be installed in the outletpiping on all heating boilers and hot water supply boilersequipped with the copper heat exchanger. Stainless steelheat exchanger DynaFlame’s are equipped with a flowswitch that is mounted and installed in the outlet boiler/ hotwater heater connection. The flow switch is mounted andinstalled on the outlet piping of a stainless steel heatexchanger DynaFlame®. The flow switch is wired in serieswith the 24VAC safety control circuit. A diagnostic light willbe indicated on the control display on a low flow condition.