Camus Hydronics VTech Series Installation And Service Manual
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8condensate cannot be drained outside, a horizontal drain sectionshould be installed in the venting before penetrating the sidewall.The water heater connects directly to a vertical vent run and doesnot require a base tee. A drain line must be connected to thewater heater to collect and dispose of condensate.Drain and Neutralizer Cartridge InstallationPlastic drain tubing shall be provided as a drain line for the waterheater condensate drain. The tubing must have a trap (a 4"(10cm) diameter circular trap loop in the drain tubing is sufficient).Prime the trap loop by pouring a small quantity of water into thedrain hose before assembly to the water heater connection. Usecaution not to collapse or restrict the condensate drain line. Thedrain must be routed to the condensate neutralization system ora suitable drain for disposal of condensate that occurs in both thewater heater and in the vent system. Ensure that the drain fromthe condensate tee is not exposed to freezing temperature.3.1.3 – CAT II VentingA Category II venting system operates with a negative pressurein the vent at all times, and with flue gas temperaturessufficiently cool for condensation to occur before reaching thetermination. As a result, a corrosion resistant stainless steel,such as AL29-4C or 316L, must be used for the venting. AL29-4C is typically recommended for having higher corrosionresistance. (This recommendation does not supersede localcodes or the provisions of CSA B149.1-15 and CSA B149.2-15 in Canada or the National Fuel Gas Code in the UnitedStates.) 316L is limited to use in applications where there is nopossibility of contaminants in the air such as refrigerants, chlorineetc. Always choose the venting system which best satisfies therequirements of the application.The Category II vent systems can be used for single appliances,but they can also be used to vent multiple appliances combinedinto a common vent. This special venting system must beengineered by a venting manufacturer or other qualifiedprofessional, using a proven vent-sizing program withknowledge of accurate operating parameters. Approval of theinstallation is at the discretion of the authority having jurisdiction.Acceptable Breech PressureFor CAT. II Vent Systems˗0.05” WC to ˗0.15” WCFor Category II vent systems, the pressure at the appliancebreeching must be kept within a range of ˗0.05” WC to ˗0.15”WC. If the calculated draft at any unit exceeds this range (i.e. ≤˗0.16” WC), a single acting barometric damper, or suitablealternative draft control approved by the vent designer orengineer, must be used to prevent the extra suction fromdecreasing the pressure at the breeching.If the vent cannot support a negative draft under all conditions,and a positive pressure will be developed during some operation,then the vent design must be changed accordingly. Possibleoptions include changing the design to Category IV, or providingan extractor (or “draft inducer”) at the vent outlet, interlocked withthe appliance operating circuit, in order to maintain a negativedraft in the vent while the unit is operating. The designer mustensure that the solution utilized will maintain the vent system atthe desired minimum draft under all conditions.Category II vents typically terminate vertically through the roof.The flue from a Category II vent system must have a condensatedrain with provisions to properly collect, neutralize and disposeof any condensate that may occur.3.1.4 – CAT IV VentingThe Category IV venting system operates with positive pressureat the appliance breeching generated by the combustion air fan,which operates the combustion process and also exhausts theflue products from the building. The pressure may be positivethroughout, though it is conceivable to operate with negativepressure in part of a Category IV vent system. In either case, theentire Category IV vent system must have all joints and seamssealed gas-tight. The flue products in the vent system will becooled below their dew point and form condensate, so CategoryIV systems must use AL29-4C or 316L stainless steel, orapproved thermoplastics like UL/ULC S636 PVC or CPVC, andpolypropylene (PPE, to maximum 12” diameter).Acceptable Breech PressureFor CAT. IV Vent Systems+0.01” WC to +1.00” WCThe installed length of the positive pressure Category IV vent,from the appliance to the point of termination outside of thebuilding, must not exceed a maximum of 100 equivalent feet(30.5M) in length. The straight length that each elbow equatesto depending on the diameter and centerline radius, typically 7 to19 feet per 90° elbow and roughly half this value for each 45°elbow. The equivalency values must be verified with theindividual vent manufacturer, as they are not standard, anddepend on the precise dimensions, surface roughness, etc., thata particular product is built with. For site conditions exceeding100 equivalent feet an engineered vent system approved by thelocal authority will be required.Category IV vents may terminate either vertically through theroof, or horizontally on a side wall. See the information about thespecific vent termination location for recommended location andclearances. The flue from a Category IV vent system must havea condensate drain with provisions to properly collect, neutralizeand dispose of any condensate that may occur. |
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