Detroit Radiant Products Company HLV Series - Manual (Page 31)

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HLV Series 3.0 Installation • Venting Requirements
Flue Venting
WARNING
!
Insufficient ventilation and/or improperly sealed vents may release gas into the building
which could result in health problems, carbon monoxide poisoning or death.
Improper venting may result in fire, explosion, injury or death.
Seal vent pipes with high temperature sealant and three (3) #8 sheet metal screws.
Vent enclosed spaces and buildings according to the guidelines in this manual and
applicable national, state, provincial and local codes.
Prior to installing vent material, the following guidelines and all applicable codes must be observed to
ensure proper system performance and safety. Local codes may vary. In the absence of local codes,
refer to and comply with the National Fuel Gas Code ANSI Z223.1 (NFPA 54) latest edition. In Canada,
refer to and comply with CAN/CGA B149.1 and B149.2 Installation Codes for Gas Burning Appliances, or
the National Standards of Canada.
Flue Venting General Requirements:
1 The HLV System is designed to operate with a 4 in. diameter exhaust vent.
2 Single-wall 26 gauge (min.) flue vent must be used. Use only corrosion resistant materials for the
discharge line from the pump to the point of discharge.
3
The use of an approved wall or roof thimble and double-wall Type B-vent is required for the
portion of vent pipe that runs through combustible material in the building wall or roof.
4 Seal all flue vents with high temperature sealant and three (3) #8 sheet metal screws to prevent
leakage of flue gases.
5 Maximum vent length is 25 ft.; minimum of 2 ft. If needs are otherwise, consult factory for approval.
6 Do not use more than two 90° elbows in the exhaust vent.
7 Protect vent cap from potential blockages, such as snow.
8 Vent must terminate a minimum of 4 ft. (1.2M) below, 4 ft. (1.2M) horizontally from, or 1 ft.
(30 cm) above any window or door that may be opened or gravity air inlet into the building.
9 Vent must terminate a minimum of 3 ft. (.9M) above any forced air inlet that is located within
10 ft. (3.1M).
The bottom of the vent terminal must be located a minimum of 12 in. (30 cm) above grade level
and must extend beyond any combustible overhang. Vents adjacent to public walkways must
terminate a minimum of 7 ft. (2.1M) above grade level.
Vent must be a minimum of 36 in. below or extend beyond any combustible overhang.
Protect the building from potential damage or discoloration resulting from flue gases by
maintaining a minimum distance of 6 inches from the sidewall of the building. On condensing
systems, extend the vent a minimum of 2 ft. beyond the building exterior to protect from
condensate drippage.
A condensate trap is required on condensing systems if a vertical rise exists in the discharge
line (Figure 3.19). For ease of condensate disposal, horizontal venting is recommended. Unless
local codes dictate otherwise, the condensate trap can be eliminated if a horizontal discharge is
pitched downward 1/4 in./Ft. (Figure 3.18). Adhere to local codes for proper condensate disposal.
Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.
The vent terminal must extend a minimum of 2 ft. (.6M) above the roof.
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