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Vent Category II Addendum Boiler Manual
KEEP THIS ADDENDUM WITH BOILER MANUAL
This Addendum adds to and supercedes items in the "Evergreen Boiler Manual"
(Part Number 550-100-131) and previously released Addenda's.
Evergreen Boilers (EVG 220, EVG 299/300, and EVG 399) can now be vented in a Category II
confi guration.
Evergreen
In addition to the
boilers are approved for Category II (negative pressure, likely to condense) as well.
This new venting option includes / requires:
• The Vent system for a Category II
and should be designed by a professional using accepted engineering practices in accordance to local
authority having jurisdiction.
• Vertical Vent only.
• Must not be installed into an existing common vent system with other appliances.
• Combustion air must come from the boiler room. See Boiler Room Air opening requirements in this
Addendum.
• Must increase venting to 6" using a 6" to 4" bell reducer at boiler vent adapter for Category II Vent
Connection.
• The Vent System should be designed so that the pressure in the 6" vent pipe immediately following
the bell reducer is between the ranges provided in the Table 1, page 2, during all running (burner lit)
conditions (i.e., High Fire through Low Fire).
• Flue gas temperature should not exceed 210°F; the boiler will shut down and recycle if it does. The
fl ue gas temperature should typically be within 20°F of the return water temperature of the boiler.
If there is the potential for a wide variation in return water temperatures, the lowest possible tem-
perature should be used for any calculations.
- continued on next page
Hazard defi nitions
e following de ned terms are used throughout these Instructions to bring attention to the presence of hazards of
various risk levels or to important information concerning the life of the product.
Indicates presence of hazards that can cause severe personal injury, death or substantial property damage.
Indicates special instructions on installation, operation or maintenance that are important but not related
to personal injury or property damage.
boiler's Category IV rating (positive pressure, likely to condense), Evergreen
Evergreen
CONDENSING GAS BOILER
boiler is considered a Designed / Engineered vent system
220/299/300/399
Part No.
550-100-268/1220
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Summary of Contents for Weil-McLain Evergreen Pro
- Page 1 CONDENSING GAS BOILER 220/299/300/399 Vent Category II Addendum Boiler Manual KEEP THIS ADDENDUM WITH BOILER MANUAL This Addendum adds to and supercedes items in the “Evergreen Boiler Manual” (Part Number 550-100-131) and previously released Addenda’s. Evergreen Boilers (EVG 220, EVG 299/300, and EVG 399) can now be vented in a Category II confi...
- Page 2 fl ue gas spillage and carbon monoxide emissions, causing severe personal injury or death. Weil-McLain recommends the use of a Variable Speed Chimney Fan/ Power venter to ensure that the appropriate negative pressure is maintained for Category II venting. This is recommended because, as a result of the boiler’s effi...
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Page 3: Direct Exhaust
fi replace can be connected Bird screens are not supplied with the Evergreen boiler. Purchase to the chimney. separately from Weil-McLain. The chimney must be straight, with no offsets, and the vent and air piping materials must comply with this instruc- tion manual. -
Page 4: Special Considerations
. . . termination . Bird screens are not supplied with the Evergreen boiler. Purchase separately from 2. Weather-stripping has been added on openable windows and Weil-McLain. doors, and . . . Part number 550-100-268/1220... - Page 5 — CONDENSING GAS BOILER DDENDUM Direct Exhaust (Category II Only) Boiler room air opening Figure 1 Corrosive contaminants and sources any of the contaminants in Figure 1, page 5. Do not pipe combustion air near a swimming pool, for example. Avoid areas subject to exhaust fumes from laundry facilities.
- Page 6 — CONDENSING GAS BOILER DDENDUM Direct Exhaust (Category II Only) Boiler room air opening Figure 2 MINIMUM combustion air openings for direct exhaust applications – ALL OPENINGS ARE FREE AREA Provisions for combustion and ventilation air to be in accordance with the section “Air for Combustion and Ventilation,”...
- Page 7 — CONDENSING GAS BOILER DDENDUM Direct Exhaust (Category II Only) – Vertical Determine location for vertical termination Figure 3 DIRECT EXHAUST vertical termination 1. Locate the vent termination using the following guide- lines: 2. The vent piping must terminate in a coupling as shown in Figure 4, page 8.
- Page 8 1. Prepare the vent termination coupling (Figure 4) by inserting a bird screen. Bird screens are not sup- plied with the Evergreen boiler. Purchase separately from Weil-McLain. 2. The vent piping must terminate in a coupling as shown in Figure 4.
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