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with the application of heat. Refer to the manufacturer's instructions. Wrap the joint with aluminum tape which is backed with an adhesive on the contact side.
3.2.5Inlet Damper and Auxiliary Control Panel (optional)
Note:
The inlet damper assembly and control panel will prevent the flow of cold air through the boiler during the off cycle and prevent freeze up. These two items are optional in all installations.
Refer to Section 4.1 for a description of the control sequence applicable to the inlet damper.
The damper must be field installed into a section of horizontal or vertical inlet ductwork. Orient the damper such that the arrow points towards the boiler.
3.2.5.1 Field Wiring to Auxiliary Control Panel
The auxiliary control panel controls the inlet damper (if used). The auxiliary control panel does not have to be mounted on or near the boiler; it can be remotely mounted.
Use 16GA MTW Wire for all field wiring. See Section 6 for the logic and wiring diagrams of this auxiliary control panel and the sealed combustion boilers.
There are five (5) field run wires between the boiler and its auxiliary control panel; three (3) for main power supply and two (2) wires for boiler interconnect.
1.The main power supply (G/H/N) must come from the same boiler that the damper is connected to.
2.Remove the blue jumper wire in the terminal block on the boiler when wiring.
There are also five (5) field run wires between the auxiliary control panel and the inlet damper assembly; three (3) to the damper actuator and two (2) to the limit switch.
1.Terminals for the damper actuator:
DO = Damper Open (CW) DC = Damper Closed (CCW) DN = Neutral/Common
2.Terminals for the limit (end) switch
SI = N.O. (Normally Open) S2 = Common
3.3EXHAUST VENTING SYSTEM
3.3.1System Design - Materials, Length, Size, and Construction
The flue gas outlet (exhaust vent) must be designed to comply with UL 1738 and
The vent must be sized according to the vent manufacture's recommendations. Consult the vent supplier for correct sizing and structural support requirements. Vent diameter is dictated by the length and height of horizontal and vertical portions of the vent installation and materials of construction. Design calculations should be based on a negative 0.03 W.C. with a stack temperature of 325º F (gross) and a CO2 level of 7.6%; (these values are to be used for vent sizing calculations.) The maximum allowable length of the vent duct, including the boot tee/135º tee (not a standard tee) and the termination is 100 equivalent feet. See Section 3.4.5 for the equivalent length of the fittings.
3.3.2 Flue Gas Outlet Duct
The installation must follow the vent manufacturer's instructions in all respects including proper joining and sealing of the tubing and fittings, clearances to combustible materials and installation of firestops.
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