T-H3 Installation Manual

22 Page
-Exhaust vent (Stainless steel vent)-
This is a Category IV appliance and must be vented accordingly. The vent system must be sealed airtight. All seams
and joints without gaskets must be sealed with high heat resistant silicone sealant or UL listed aluminum adhesive
tape having a minimum temperature rating of 160 °F (71 °C). For best results, a vent system should be as short and
straight as possible.
 The Indoor models are a Category IV appliance and must be vented accordingly with any 4” vent approved for use with
Category III/IV or Special BH type gas vent.
 The manufacturer recommends the NovaVent line. However, the following are also UL listed manufacturers: ProTech
Systems Inc. (FasNSeal), Metal-Fab Inc., and Heat-Fab Inc. (Saf-T Vent).
 Follow the vent pipe manufacturer’s instructions when installing the vent pipe.
 The maximum length of exhaust vent piping must not exceed 100 ft (30.5 m) (deducting 5 ft (1.5 m) for each elbow used in
the venting system). Do not use more than 5 elbows.
 When the horizontal vent run exceeds 5 ft (1.5 m), support the vent run at 3 ft (0.9 m) intervals with overhead hangers.
Installaon
Installaon Manual
Diameter Max. No. of Elbows Max. Vertical and Horizontal (Total) Vent Length*
4 in. (102 mm) 5 100 ft (30.5 m )
*For each elbow added, deduct 5 ft. (1.5 m) from max. vent length.
Excludes vent terminators, termination elbows, or rain caps.
No. of Elbows Max. Vertical or Horizontal Vent Length No. of Elbows Max. Vertical or Horizontal Vent Length
0 100 ft (30.5 m) 3 85 ft (25.9 m)
1 95 ft (29.0 m) 4 80 ft (24.4 m)
2 90 ft (27.4 m) 5 75 ft (22.9 m)
-DIP switch settings for vent length-
stainless steel vents
WARNING
 Adjust the appropriate DIP switches according to model and vent length as shown
below. DO NOT adjust the other DIP switches.
 Turn off the power supply to the water heater before changing the DIP switch settings.
 Failure to observe these warnings could lead to carbon monoxide poisoning or death.
DIP switch settings : Single pipe and Direct vent installations / Vent diameter : 4" (102 mm) venting
240 /340 Indoor 540 Indoor (Upper bank of DIP switches)
Vent length
5 to 50 ft (1.5 to 15.2m)
(DEFAULT)
51 to 100 ft (15.3 to 30.5 m)
5 to 50 ft (1.5 to 15.2m)
(DEFAULT)
51 to 100 ft (15.3 to 30.5 m)
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : O N
No. 7 : OFF
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : OFF
No. 7 : OFF
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : O N
No. 4 : OFF
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : OFF
No. 4 : OFF

Roof

Fire stop
Rain cap

Wall
Sidewall vent

Hanger
Hanger
For details of the optional items, refer to the Installation manual for each optional item.