Rev. C 10-5-07 P/N 472592
23
HORIZONTAL OR VERTICAL VENTING
- POSITIVE PRESSURE
(See Figures 14, 15, and 16)
(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 MasterTemp is 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 MasterTemp
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 MasterTemp 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 3. Installation
Table 11.
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