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24
HORIZONTAL OR VERTICAL VENTING
(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. 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
The allowable vent runs for each vent pipe diameter are different and can not be exceeded. Each 90° 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 ft. See the Table 8 below for the maximum vent lengths using 90° elbows.
The MasterTemp heater is a "Category III" appliance (which
requires a four (4) inch special gas approved "Category
III" 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 III Appliances", and for operating temperatures less
than 400°F (204°C). Vent pipe construction will be of UL 1738
approved non-corrosive material, such as stainless steel. 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. See
page 19, for heater ventilation air requirements. 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 MasterTemp heater is
suitable for through-the-wall venting.
CONNECTING SPECIAL METALIC GAS VENT TO THE HEATER
1. Order an optional appliance adapter kit,
831-7133
for more information)
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.
®
MASTERTEMP
Pool and Spa Heater Installation and User's Guide
- POSITIVE PRESSURE
Table 11
for maximum permissible vent lengths.
NOTE
(Pentair offers optional appliance adapter kits, call Customer Service at
: Part No. 77707-0086 for Saf-T Vent® or Saf-T Vent® CI. Part No. 77707-0087
Section 3. Installation Instructions
(See Figures 14, 15, and
Table 8.
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Do NOT combine exhaust vent pipes to a
common exhaust vent in multiple unit
installations. Run separate vent pipes.
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