Horizontal Or Vertical Venting - Positive Pressure; Connecting Special Gas Venting - Pentair MASTERTEMP 125 Installation And User Manual

HORIZONTAL OR VERTICAL VENTING
(Category III)
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.
.
CONNECTING SPECIAL METALIC GAS VENT TO THE HEATER
Rev. B 8/14
- POSITIVE PRESSURE
NOTE
®
(
MASTERTEMP ® 125 Pool and Spa Heater Installation and User's Guide
Section 3. Installation Instructions
(See Figures 15, 16, and
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)