13
Operating Instructions and Owner’s Manual
Enerco | Heatstar ER2STG Tube Series Heater
SECTION 5
Venting / Ducting
General Requirements
This heater must be vented in accordance with the
specifications
contained in this manual and with the following national codes
and any state, provincial or local codes which may apply:
• Refer to National Fuel Gas Code NFPA 54/ANSI Z223.1- latest
revision.
• CANADA: Refer to Natural Gas and Propane Installation Code
CSA B149.1- latest revision.
The heater may be vented to the outdoors either vertically or
horizontally.
Optional outside air supply may be directed to the heater
horizontally or vertically.
Be sure that the method selected for venting heater complies
with all codes as required for each particular location
The use of single-wall vent pipe (26 gauge) is recommended. A
section of double-wall vent pipe is recommended when passing
through the roof or wall.
Exhaust end of heater will accept a 4'(10 cm) vent pipe using
the vent adapter. Install the vent adapter with the seam on
top, secure all vent joints with a minimum of 3 #8 x 3/8" sheet
metal screws and seal all joints using a high temperature
silicone sealant.
If condensation in the flue is a problem, the flue length should
be shortened or insulated.
Vent pipe must be sloped downward away from the burner
1/4"(.6 cm) for ever 10'(3m).
VENT LENGTHS:
• Maximum total vent length allowed in thirty (30’) feet.
• Maximum outside air supply duct allowed thirty (30’) feet.
• Maximum total vent length plus outside air supply length
shall not exceed fifty (50’) feet.
NOTE:
A total of two (2) elbows are allowed for vent and
outside air supply combination. Subtract 5' feet per additional
elbow from maximum length allowed if 3 or more elbows are
used.
Install a minimum 18" (30 cm) straight length of duct for air
intake or vent before any Tee or elbow.
Alternative Arrangements / Optional Equipment for Venting
Unvented Operation
a) Sufficient ventilation must be provided in the amount of 4
CFM per 1,000 BTU/hr. firing rate.
b) Refer to ANSI Z223.1 - latest revision, NFPA-54 and local
codes for additional information.
c) Use of optional outside combustion air is not recommended
with unvented heaters due to pressure considerations. Refer
to page 16
Horizontal Venting
This heater, when horizontally vented, must be installed
with approved venting system. For horizontal venting
installations these tube heaters are certified as a Category III
appliance
a) Four (4”) inch O.D. flue pipe is required. Thirty (30’) feet
maximum length is recommended.
b) All flue joints should be sealed using suitable product such
as General Electric RTV106 or Permatex Form-A-Gasket Red
High Temperature Silicone Adhesive Sealant.
c) Do not install any elbow or 45 fitting to bring vent lower
than the horizontal tube system.
d) Vent terminal should be installed at a height sufficient to
prevent blockage by snow.
1) Vent must exit building not less than seven (7’) feet
above grade when located adjacent to public walkways.
2) Vent must terminate at least three (3’) feet above any
forced air inlet located within ten feet (10’).
3) Vent must terminate at least four (4’) feet below, four
(4’) feet horizontally from, or one (1’) foot above any
door, window, or gravity inlet into any building.
4) Vent terminal shall be located at least twelve (12”)
inches from any opening through which vent gases
could enter the building
.
5) Vent terminal must be beyond any combustible over
hang
Vertical Venting
This heater, when vertically vented, must be installed with
the approved venting system. For vertical vent installations,
ER2STG 60-100 model and ER2STG 80-125 model are category
I appliances. The ER2STG 125-175 model is only Category I
when vented vertically with 6" (15.25cm) diameter vent pipe.
a) Four (4”) inch O.D. flue pipe, maximum thirty (30’) feet
in length may be used as shown with approved vent cap.
(See General Requirements on this page for additional
information.)
b) An insulated thimble may be required to pass through
combustible structures (check local codes).
c) All flue joints should be sealed using suitable products (see
recommendation for horizontal venting.)
Common Venting
a) Horizontal run to vent must never exceed 75% of the
vertical height of the vent. Refer to ANSI Z223.1 - latest
revision, NFA-54 for proper vent sizes and installation.
b) Open area of common vent must equal the sum of the
open area of individual vents connected to it. (See chart
below and diagrams - page 14.)
c) Use double wall vent as required (check codes.)
d) All joints must be sealed using suitable products.
e) Connections to common stack must be positioned to avoid
direct opposition between streams of combustion gases.
COMMON VENTING - (2) Heaters (Horizontal and Vertical)
Model #
H = 6 ft.
H = 8 ft.
H = 15 ft.
ER2STG 60-100 D = 8"
D = 8"
D = 7"
ER2STG 80-125 D = 10"
D = 10"
D = 8"
