Noritz NRCP111-DV, Installation Manual

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17
REDUCING VENT SIZE: TRANSITIONING FROM 3" TO 2"
VENT PIPE MUST ALWAYS TAKE PLACE IN A VERTICAL
POSITION TO PREVENT CONDENSATE BLOCKAGE.
3 inch pipe 2 inch pipe
(A field supplied PVC reducer bushing must be used.)
Chapter 4. – Installation
Vent Pipe Installation
Tightening
• You can select the size of vent pipe(2" or 3") according to the installation conditions.
• Push the pipe into the unit flue until it touches the bottom.
• Tighten the band clamps using a screwdriver.
• Finally, make sure that both pipes(exhaust & air intake) are securely fixed.
Vent Termination
Vent Screen Installation
• Install vent screen (Only 3 " vent screens are included as accessories), see the below figure for appropriate
configuration.
• After connecting vent/air inlet terminal, it is required to install screen for the terminal to prevent incoming of
debris and animals, which might cause damage to the unit.
(2 " vent screen (1/4 " mesh) must be purchased for 2 " venting installation)
Allowable Schedule 40 Vent Length (PVC, CPVC)
* The termination elbow must be included in the total number of elbows.
Maximum Vent Length
The unit can be adjusted to accommodate longer vent runs; refer to the below table to find the maximum vent
length based on the number of elbows.
3" vent screen (1/4" mesh)
Pipe diameter 3 " (75mm) 2 " (50mm)
No. of Elbows
Max Equivalent Vent Length*
6 70
´
N/A
5 75
´
N/A
4 80
´
18
´
3 85
´
26
´
2 90
´
34
´
1 95
´
42
´
0 100
´
50
´
• 5 feet (1.5M) for each additional
3-inch 90-degree elbow
• 2.5 feet (0.75M) for each additional
3-inch 45-degree elbow
• 8 feet (2.4M) for each additional
2-inch 90-degree elbow
• 4 feet (1.2M) for each additional
2-inch 45-degree elbow
Reducer bushing
CAUTION