Pentair MT125 Installation And User Manual page 24

Section 1. Installation Instructions
24
Table 5. – Maximum Number of Elbows per Vent
Maximum
Elbows
Allowed
1. See previous page for STEP 1 - See Table 4 (page 23),
to determine allowable vent sizes for the MasterTemp
2. Install the metal Flue Collar in the Vent Body of the
heater (located under the outside vent cover). Fasten the
metal Flue Collar to the Vent Body with two #10 sheet
metal screws. Use high temperature silicone RTV to seal
the Flue Collar to the Vent Body. Before connecting the
metal Flue Collar 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 100 mm (4") end of
the metal Flue Collar. Attach the metal Flue Collar to the
Vent Body using the RTV supplied with the kit, following
the vent manufacturer's instructions (included with kit).
3. Attach the vent pipe to the metal Flue Collar with sheet-
metal screws.
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
Maximum Number of Elbows per Vent Lengths
[C]
Total Vent Length
(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.)
[A]
Horizontal Maximum Vertical Vent Length
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.)
500 mm min.
15 cm (6 in) min.
Clearamce to
Combustible
materials
Class B Double Wall
Metal Vent Pipe
Metal Flue
Vent
Body
Figure 18.
[B]
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.)
Listed
Termination
Cap
Storm Collar
Flashing
Firestop
Collar
Support Vertical
Vent Pipe so
adapter does not
take weight of
pipe.
460906 Rev. D 8/2020