Installation (Continued); Horizontal Or Vertical Venting (Category Iv) - Positive Pressure - Pentair ETi 250 Installation And User Manual

HORIZONTAL OR VERTICAL VENTING (CATEGORY IV) - POSITIVE PRESSURE

(See Figure 29, page 37 and Figure 30, page 38)
Vent the heater either horizontally or vertically using the 4 in Vent Adapter that is provided with the heater. Install the
vent pipe in accordance with local codes and the provisions of the National Fuel Gas Code, ANSI Z223.1 (U.S.),
or the standards CSA B149.1, Natural Gas and Propane Installation Codes (Canada), and the vent manufacturer's
instructions. Do not use a draft hood with this heater. Install the vent according to the vent manufacturer's
detailed instructions. Note: Maintain clearance between the vent pipe and combustible surfaces according to the
vent manufacturer's instructions and code requirements. Do not place any insulating materials around the vent
or inside the required clear air space surrounding the vent. See Table 6 for maximum permissible vent lengths.
Each 90° elbow reduces the maximum horizontal vent run by 12 ft and each 45-degree elbow in the vent run
reduces the maximum vent run by 6 ft. See the Table 6 below for the maximum vent lengths using 90° elbows.
The ETi 250 heater is a Category IV appliance
®
The ETi 250 heater requires a 4 in special gas approved Category IV vent pipe and is a forced-draft pool and spa heater
which uses positive pressure to push flue gases through the vent pipe to the outside. Flue gases under positive pressure
may escape into the dwelling with any cracks or loose joints in the vent pipe, or improper vent installation. The vent pipe
must be of a sealed-seam construction, such as those listed for use with Category IV Appliances. Vent pipe construction
will be of UL 1738 approved non-corrosive material, such as non-metalic PVC schedule 40 per ASTM D2665, CPVC
schedule F441 or stainless steel such as AL 29-4C per UL 1738 in USA. In Canada must comply with ULC-5636 code
requirements. The 4-in exhaust socket is CPVC. A condensate trap is required.
Note: To solvent weld the PVC vent pipe to the CPVC exhaust socket use an approved industry standard primer and
cement solvent specifically intended and marketed for PVC/CPVC joints, consult the adhesive manufacturer for details.
The use of Approved thimbles, roof jacks and/or side vent terminals are required; and the proper clearances to
combustible materials must be maintained in accordance with type of vent pipe employed—in the absence of a clearance
recommendation by the vent pipe manufacturer, the requirements of the Uniform Mechanical Code should be met. The
ventilation air requirements for the heater are shown on page 36 and 37. It is recommended that use of a condensate trap in
the vent run close to the heater may be necessary in certain installations such as cold climates. Horizontal vents 4 in (25.4
mm) or less in length do not require a condensate tee. The heater is suitable for through-the-wall venting.
(*) Special Gas Vent (Vertical or Horizontal)
Maximum length in Feet (m)
No. of 90° Elbows 4-in (10 cm) pipe 6-in (15 cm) pipe
0 120 ft. (36.6 m)
1 108 ft. (33 m)
2 96 ft. (29.3 m)
3 84 ft. (26 m)
4 72 ft. (22 m)
Table 6.
NOTE
(*)
with vent manufacturer's instruction, and local and national
codes. Horizontal vents 3 ft (1M) or less in length do not
require a condensate tee, but must slope down toward the
300 ft. (91.4 m)
heater at 1/4 in to the foot (2 cm / m) to allow condensate to
288 ft. (87.7 m)
drain through the neutralizer cartridge.
276 ft. (84.1 m)
264 ft. (80.4 m)
252 ft. (76.8 m)
ETi 250 High Efficiency Pool and Spa Heater Installation and User's Guide
Minimum vent length is 1 ft (.34M), or in accordance
Installation
35