Horizontal Or Vertical Venting - Using Single-Wall Stainless Gas Vent - Pentair MT125 Installation And User Manual

HORIZONTAL OR VERTICAL VENTING - USING SINGLE-WALL STAINLESS
GAS VENT
(SEE FIGURES 22, 23, & 24)
Vent the heater either horizontally or vertically using an optional vent adapter of the 150 mm (6 in) or 102 mm (4 in)
special gas approved stainless steel vent pipes. Installation must be in accordance with AS/NZS 5601.1 and/or local
codes and ordinances/or the latest edition of the local code standards and/or local codes. The heater, when installed, must
be electrically grounded and bonded in accordance with local codes. Do not use a draft hood with this heater. Install the
vent according to the vent manufacturer's detailed instructions. Note: Keep a 150 cm (6 in) minimum clearance between
the vent pipe and combustible surfaces. Follow 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 5 (page
24) for maximum permissible vent lengths.
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 3.6 m (12 feet) and each 45-degree elbow in the
vent run reduces the maximum vent run by 1.8 m (6 feet). See the Table 6 for the maximum vent lengths using 90°
elbows.
It is recommended that vent runs over 5.4 m (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 1 m (3 feet) or less in length do not require a condensate tee.
Note: The MasterTemp 125 heater is suitable for through-the-wall venting.
NOTE: After installation,
installer must check for
correct and safe operation of
the heater.
Flue gases 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 and for operating temperatures less than 204° C (400°F). Vent pipe
construction will be according to local code standards, 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 26 for ventilation air requirements for the MasterTemp 125 heater.
460906 Rev. D 8/2020
NOTE
NOTE
150 mm (6 in.)
Special Gas Vent (Vertical or Horizontal)*
No. of 90°
Maximum Length in Feet (M)
Elbows
0
1
*
Minimum vent length is 0.34M (1 ft.) or in accor-
dance with vent manufacturer's instruction, and lo-
cal and national codes. Horizontal vents
1 m (3 in) or less in length do not require a conden-
sate tee, but must slope down toward the outlet at
2 cm to the meter (1/4 in / ft.) to allow condensate
to drain.
Table 6.
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
Section 1. Installation Instructions
11.6 m (38 ft.)
8 m (26 ft.)
27