General, Venting, Requirements for installation in canada – Lochinvar Sunc Condensing Boiler 1.3 User Manual
Page 16: Sizing
16
Installation & Operation Manual
2
General
venting
Requirements for installation in
Canada
1. Installations must be made with a vent pipe system
certified to ULC-S636.
2. The first three (3) feet of plastic vent pipe from the
appliance flue outlet must be readily accessible for visual
inspection.
3.
The components of the certified vent system must not be
interchanged with other vent systems or unlisted
pipe/fittings.
Sizing
The SYNC boiler uses model specific combustion air
intake and vent piping sizes as detailed in Table 2A
below.
When determining equivalent combustion air and vent
length, add 5 feet for each 90° elbow and 3 feet for each
45° elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2)
45° elbows + (1) concentric vent kit (CVK3003) = 49
equivalent feet of piping.
Table 2A Air Intake/Vent Piping Sizes
Increasing or decreasing combustion air or vent piping sizes is not authorized.
NOTICE
Model
Air Intake
Diameter
Air Intake
Min. Length
Air Intake
Max. Length
Vent
Diameter
Vent
Min. Length
Vent
Max. Length
Input
De-Rate per
25 feet of Vent
SB 1000
6"
12'
100'
6"
12'
100'
1.25%
SB 1300
6"
12'
50'
6"
12'
50'
2.90%
SB 1300
7"
12'
100'
7"
12'
100'
0.95%
SB 1500
6"
12'
50'
6"
12'
50'
3.30%
SB 1500
7"
12'
100'
7"
12'
100'
1.65%
Note: When using a 7" vent or air pipe, a field supplied increaser is required.