Pentair MASTERTEMP 125 Installation And User Manual page 22

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 ft). See the Table 8 for the maximum vent lengths using 90°
See Table 6a. – Maximum Number of Elbows per Vent Lengths below.
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 ft) or less in length do not require a condensate tee.
Note: The MasterTemp heater is suitable for through-the-wall venting.
150 mm (6 in.) or 102 mm (4 in) Special Gas Vent (Vertical or Horizontal)*
No. of 90° Elbows Maximum Length in Feet (M)
0
11.6 m (38 ft.)
1 8 m (26 ft.)
*
Minimum vent length is 1 m (3 ft.) or in accordance with vent manufacturer's instruction, and local and national codes.
Horizontal vents 1 m (3 ft) or less in length do not require a condensate tee, but must slope down toward the outlet at 2
cm (1 in) to the meter (1/4 in / ft.) to allow condensate to drain.
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 17 for ventilation air requirements for the MasterTemp heater.
IMPORTANT NOTE: AFTER THE HEATER INSTALLATION, THE INSTALLER MUST CHECK FOR
Table 6a. – Maximum Number of Elbows per Vent Lengths
Maximum Number of Elbows per Vent Lengths
Maximum [C]
Elbows Total Vent Length
Allowed (C=A+B)
2m (6.6 ft.)
3m (9.8 ft.)
3
4m (13.1 ft.)
5m (16.4 ft.)
6m (19.7 ft.)
7m (23 ft.)
8m (26.2 ft.)
9m (29.5 ft.)
10m (32.8 ft.)
2
11m (36.1 ft.)
12m (39.4 ft.)
13m (42.6 ft.)
14m (45.9 ft.)
15m (49.2 ft.)
16m (52.5 ft.)
17m (55.8 ft.)
18m (59 ft.)
1
19m (62.3 ft.)
20m (65.6 ft.)
21m (68.9 ft.)
22m (72.2 ft.)
P/N 475114 Rev. F 8/2020
CORRECT AND SAFE OPERATION OF THE HEATER.
[A]
Horizontal Maximum
Vent Length
0.67m (2.2 ft.)
1m (3.3 ft.)
1.33m (4.4 ft.)
1.67m (5.5 ft.)
2m (6.6 ft.)
2.33m (7.6 ft.)
2.67m (8.8 ft)
3m (9.8 ft.)
3.33m (10.9 ft.)
3.67m (12 ft.)
4m (13.1 ft.)
4.33m (14.2 ft.)
4.67m (15.3 ft ft.)
5m (16.4 ft.)
5.33m (17.5 ft.)
5.67m (18.6 ft.)
6m (19.7 ft)
6.33m (20.8 ft.)
6.67m (21.9 ft.)
7m (23 ft.)
7.33m (24 ft.)
NOTE
NOTE
[B]
Vertical Vent Length
1.33m (4.4 ft.)
2m (6.6 ft.)
2.67m (8.8 ft.)
3.33m (10.9 ft.)
4m (13.1 ft.)
4.67m (15.3 ft.)
5.33m (17.5 ft.)
6m (19.7 ft.)
6.67m (21.9 ft.)
7.33m (24 ft.)
8m (26.2 ft.)
8.67m (28.4 ft.)
9.33m (30.6 ft.)
10m (32.8 ft.)
10.67m (35 ft.)
11.33m (37.2 ft.)
12m (39.4 ft.)
12.67m (41.6 ft.)
13.33m (43.7 ft.)
14m (45.9 ft.)
14.67m (48.1 ft.)
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
Section 1. Installation
(*) The maximum
horizontal component of
the flue length is 1/3 of
the total length.
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Table 6.