Horizontal Or Vertical Venting - Positive Pressure - Pentair MASTERTEMP 125 Guide D'installation Et D'utilisation

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 6 below for the maximum vent lengths using 90° elbows.
125 heater is a "Category III" appliance
®
The MasterTemp
(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, 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
are shown on page 18. 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® 125 heater is suitable for through-the-wall venting.
CONNECTING SPECIAL METALIC GAS VENT TO THE HEATER
1. Order an optional appliance adapter kit,
(800) 831-7133
for more information)
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.
Rev. C 3/2019
- POSITIVE PRESSURE
NOTE
125 heater
®
(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-
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
Section 3. Installation Instructions
(See Figures 15, 16, and
Table 6 for maximum permissible vent lengths.
4 in. Special Gas Vent
(Vertical or Horizontal)
No. of 90° Elbows Maximum Length in Feet (M)
0 70 ft. (21.3 M)
1 58 ft. (17.7 M)
2 46 ft. (14.0 M)
3 34 ft. (10.4 M)
4 22 ft. ( 6.7 M)
Table 6.
*
Minimum vent length is one foot (.34M),
or in accordance with vent manufacturer's
instruction, and local and national codes.
Horizontal vents 3'(1M) or less in length
do not require a condensate tee, but must
slope down toward the outlet at 1/4" to the
foot (2cm/M) to allow condensate to drain.
CAUTION
Do NOT combine exhaust vent pipes to a
common exhaust vent in multiple unit
installations. Run separate vent pipes.
23
17)