The water heater must be installed with a 3”/5” diameter UL approved Category III Coaxial Stainless Steel appliance coaxial vent pipe and an appropriate adapter.
DANGER: Failure to install the appliance vent adapter and properly vent the water heater to the outdoors as outlined in the Venting section of this manual will result in unsafe operation of the water heater, causing death, serious injury, explosion, or fire. To avoid the risk of fire, explosion, or asphyxiation from carbon monoxide, NEVER operate the water heater unless it is properly vented and has adequate air supply for proper operation as outlined in the Venting section of this manual.
WARNING: Use 3”/5” UL approved Category III Stainless Steel vent material only. No other vent material is permitted.
WARNING: Refer to page 7 for clearances to combustible material.
Venting
The installation of venting must comply with national codes, local codes and the vent manufacturer’s instructions..
The water heater must be vented to the outdoors as described in these instructions.. DO NOT connect this water heater to a chimney.. It must be vented separately from all other appliances..
All coaxial vent components (adapters, pipe, elbows, terminals, etc..) should be UL 1738 Certified Stainless Steel Venting Material (e..g..
The specified vent termination must be used.. (Refer to pages 13 and 14 for an example of the concentric vent..)
Use the screws provided to connect the coaxial vent pipe with the
Follow coaxial vent manufacturer’s installation instructions and their recommended clearances to combustibles.. The unit can be vented either horizontally or vertically..
Coaxial vent pipe runs must be adequately supported along both horizontal and vertical runs..
The maximum recommended unsupported span should be no more than five (5) feet (1..5 m).. Support isolation hanging bands should be used.. DO NOT use wire.. (See diagram below)..
Notes on
NO!YES!
If the water heater is being installed as a replacement for an existing water heater, a thorough inspection of the existing venting and air intake system must be performed prior to any installation work.. Verify that the correct materials, vent lengths and terminal locations as detailed in this Use and Care Manual have been met.. Carefully inspect the entire venting and air intake system for any signs of cracks or fractures, particularly at the joints between elbows or other fittings and the straight runs of vent pipe.. Check the system for signs of sagging or other stresses in the joints as a result of misalignment of any components in the system.. If any of these conditions are found, they must be corrected in accordance with the venting instructions in this manual before completing the installation and putting the water heater into service..
See the back page of this manual for additional requirements for the Commonwealth of Massachusetts.
Number | Maximum |
of 90° | Length of |
elbows | Straight |
(bends) | Pipe |
1 | 26’ |
| (8..0 m) |
2 | 24' 6"’ |
| (7..5 m) |
3 | 23" |
| (7..0 m) |
4 | 21' 6" |
| (6..5 m) |
|
|
Venting Lengths
MAXIMUM VENT LENGTH: The system will not operate if there is excessive restriction (pressure drop) in the venting system.. A maximum 26’(8..0 m) of vent pipe may be used provided there is only one 90° elbow in the system.. If additional elbows are required: two elbows can be used with 24’ 6"(7..5 m), three elbows can be used with 23’ (7..0 m) or four elbows can be used with 21’ 6" (6..5 m) of vent pipe..
A 90° elbow is equivalent to 1’6” (..5 m) of straight pipe.. A 45° elbow is equivalent to 9” (..25 m) of straight pipe..
The vent termination does not count as straight pipe when determining total vent lengths..
The 94° elbow is equivalent to a 90° elbow..
The vent should be installed with a slight downward slope of 7/8” per foot of horizontal run toward the vent terminal (see diagram below).. This ensures that any
7/8" per foot | Wall Plates |
downward slope |
| 94° Elbow |
|
2’ | Fire |
|
Stop | Vent Pipe | |
(61 cm) |
| |
Max . |
|
|
| Ceiling | |
| Board | |
| Inspection | Inspection |
| Access Panel #1 | Access |
|
| Panel #2 |
condensate formed during operation of the unit is evacuated from the appliance and to prevent rain from entering the appliance..
An upward slope toward the vent terminal is not acceptable for horizontal venting..
MINIMUM VENT LENGTH: The venting may be as short as 12” (30 cm), provided one vent termination is installed to the outdoors through a sidewall, one 94° elbow is included in the installation and the wall plates are installed..
Notice: Make sure that the seam of the inner vent pipe in horizontal runs is toward the top of the installation (see diagram to the far left)..
Vent Seam
9
