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Also make certain that the power venter terminal will not be subjected to winds which could effect power venter operation. 6) Do not connect the vent of this appliance into any portion of a mechanical vent system operating under positive pressure. 9 7) Do not connect the boiler into a chimney flue serving an open fireplace or other solid fuel appliance. 8) Prior to boiler installation, inspect chimney for obstructions or other defects and correct as required. Clean chimney as necessary. 9) Vent pipe should slope upward from draft diverter not less than one inch in four feet. No portion of vent pipe should run downward or have sags. Vent pipe must be securely supported. 10) The vertical section of vent pipe coming off the boiler should be as tall as possible, while still maintaining the proper clearance from the horizontal vent connector to combustibles and the proper pitch called for in (9) above. 11) Vent pipe should be installed above the bottom of the chimney to prevent blockage. 12) Vent pipe must be inserted flush with inside face of the chimney liner and the space between vent pipe and chimney sealed tight. 13) Do not install the vent damper in any portion of the vent system which is used by appliances other the boiler being installed. 14) Vent damper installation is mandatory on all AWI/TWI boiler models due to federally mandated efficiency regulations. Install vent damper (see Figure 9) as follows: a) Open vent damper carton and remove installation instructions. Read the instructions thoroughly before proceeding. Verify that vent damper is same size as draft diverter outlet. See Figure 1. Unpack vent damper carefully. Do not force closed damper blade. Forcing vent damper closed may result in damaged gear train and void warranty. b) Vent damper is factory shipped having approximately .” diameter hole in the vent damper blade, which must be left open for boilers equipped with standing pilot, and should be plugged on boilers with EI control system, using the plug supplied with the damper. Mount the vent damper on the flue collar without modification to either and secure with sheet metal screws. Make sure screws do not interfere with damper blade operation. Vent damper blade position indicator must be visible to users. c) The damper wire harness is shipped wired into the boiler limit control. Plug the loose end of this harness into the damper and secure the flexible conduit to the damper using a connector nut provided. Provide adequate clearance to combustible construction and servicing. d) Install vent connector pipe and vent fittings from vent damper outlet to chimney or gas vent. Secure with sheet metal screws and support as required. FIGURE 9: VENT DAMPER INSTALLATION DETAILS RIGHT SIDE VIEW Removing an Existing Boiler from a Common Chimney In some cases, when an existing boiler is removed from a common chimney, the common venting system may be too large for the remaining appliances. At the time of removal of an existing boiler the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining 10 connected to the common venting system are not in operation. connected to the common venting system are not in operation. VII Gas Piping Gas piping to the boiler must be sized to deliver adequate gas for the boiler to fire at the nameplate input at a line pressure between the minimum and maximum values shown on the rating plate. For more information on gas line sizing, consult the utility or Part 2 of the National Fuel Gas Code. Figure 10 shows typical gas piping connection to the AWI/TWI boiler. A sediment trap must be installed upstream of all gas controls. Install a manual shut-off valve outside the jacket and ground joint union as shown. The boiler and its gas connection must be leak tested before placing the boiler in operation. When doing this, the boiler and its individual shut-off must be disconnected from the rest of the system during any pressure testing of that system at pressures in excess of 1/2 psi. When pressure testing the gas system at pressures of 1/2 psi or less, isolate the boiler from the gas supply system by closing its individual manual shut-off valve. FIGURE 10: GAS CONNECTION TO BOILER * State of Massachusetts Requires Manual Shut-off Valve to be “T” Handle Type * 11 VIII System Piping VIII System Piping • INSTALL BOILER SO THAT THE GAS IGNITION SYSTEM COMPONENTS ARE PROTECTED FROM WATER (DRIPPING, SPRAYING, RAIN, ETC.) DURING APPLIANCE OPERATION AND SERVICE (CIRCULATOR REPLACEMENT, ETC.). • OPERATION OF THIS BOILER WITH CONTINUOUS RETURN TEMPERATURES BELOW 120°F CAN CAUSE SEVERE HEAT EXCHANGER CORROSION DAMAGE. • OPERATION OF THIS BOILER IN A SYSTEM HAVING SIGNIFICANT AMOUNTS OF DISSOLVED OXYGEN CAN CAUSE SEVERE HEAT EXCHANGER CORROSION DAMAGE. • DO NOT USE TOXIC ADDITIVES, SUCH AS AUTOMOTIVE ANTIFREEZE, IN A HYDRONIC SYSTEM. Standard Piping Figure 11 shows typical boiler system connec...

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