Rev. B 6-23-08
P/N S794
2 3
HORIZONTAL OR VERTICAL VENTING
- POSITIVE PRESSURE
(
See Figures 16, 17, and 18
)
(Category III)
Vent the heater either horizontally or vertically using an optional vent adapter of the 4-inch special gas approved Category III
vent pipes. 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.
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 11
for maximum permissible vent lengths.
NOTE
The allowable vent runs for each vent pipe diameter are different and can not be exceeded.
Each 90-degree elbow reduces the maximum horizontal vent run by 12 feet and each 45-degree elbow in
the vent run reduces the maximum vent run by 6 feet. See the table below for the maximum vent lengths
using 90-degree and 45-degree elbows.
The Max-E-Therm
®
may be installed as a “Category III” appliance 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 III Appliances”, and for operating
temperatures less than 400° F. Vent pipe construction will be of UL
1738 approved non-corrosive material, such as stainless steel, aluminum,
galvanized. A condensate trap may be needed. 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 Max-E-Therm heater can be
found on
page 19
.
It is recommended that vent runs over 18 feet may
need to be insulated to reduce condensation related problems and/or the
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 3’ (1M) or
less in length do not require a condensate tee. The Max-E-Therm heater
is suitable for through-the-wall venting.
CAUTION
Do
NOT
combine exhaust vent pipes to a common exhaust vent in multiple unit installations. Run separate vent pipes.
CONNECTING SPECIAL GAS VENT TO THE HEATER
Metallic:
1. Order an optional appliance adapter kit,
(Pentair offers optional appliance adapter kits, call our Customer Service dept.)
:
- Part No. 77707-0086 for Saf-T Vent® or Saf-T Vent® CI.
- Part No. 77707-0087 for Z-Vent.
2. Remove the outside vent cover.
3. Install the Appliance Adapter in the Vent Body of the heater (located under the outside Vent Cover). Before connecting
the Appliance Adapter to the Vent Body, wet a clean cloth or paper towel with isopropyl alcohol (rubbing alcohol) and
vigorously wipe the socket of the Vent Body. Immediately wipe the cleaned surfaces dry with a clean cloth or paper
towel. Repeat for the exterior of the heater end of the Appliance Adapter. Attach the appliance adapter to the vent
body using the adhesive specified by the vent manufacturer, following the vent manufacturer’s instructions.
Section 2. Installation
Table 11.
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