PLATINUM
WATER HEATER
9
PV500-37C 06/12
5.3
Maximum Allowed Vent Length (Equivalent Length)
Maximum equivalent length of vent must not exceed the length identified in the table below:
Vent Pipe
Diameter (inches)
Equivalent length
(in feet)
Maximum
Equivalent Inlet
Length (in feet)
90° elbow
45° elbow
3” (Model 199 only)
12
5
80*
4” (All Models)
14
5
100
5” (All Models)
15
6
300
6” (All Models)
17
7
500
* Model 199 using 3” vent pipe is limited to 4-90° elbows or 8-45° elbows.
To determine the maximum equivalent vent length of your installation, follow these steps:
A. Add the total length of straight pipe (in feet).
B. Multiply the number of 90° elbows used in vent system by the equivalent length of straight pipe specified in
table above.
C. Multiply the number of 45° elbows used in vent system by the equivalent length of straight pipe specified in
table above.
D. Add (A), (B) and (C) together to obtain the total feet of venting. This length must not exceed the maximum
vent length identified in table above.
Example: A 4" venting system of 25 ft. of straight pipe and two 90° elbows.
Total straight pipe = 25 feet.
Number of elbows (2) x 14 = 28 equivalent feet of straight pipe.
25 feet plus 28 feet = 53 equivalent feet of venting. (Acceptably less than the 100 foot vent length allowed.)
5.4
Vent Construction and Assembly
1. Read and follow the information, instructions and warnings in section “VENTING” above.
2. Do not insulate the plastic vent pipe.
3. Clean and deburr all solid PVC (solid CPVC required for models with “SANI” in the model number) pipe ends
and the joint area and trial assemble the vent before joining with PVC cement (CPVC cement required for
models with “SANI” in the model number), following the cement manufacturer’s instructions for making
sound air and water tight joints.
4. Dry-fit a solid 4" PVC coupling or elbow (solid 4" CPVC vent pipe and components required for models with
“SANI” in the model number) onto the appliance flue outlet. Remove the fitting and apply a liberal coating of
room temperature vulcanizing (RTV) adhesive to the outside of the stainless steel flue outlet and to the
inside of the plastic pipe coupling. Before the RTV sets, slide the plastic coupling or elbow back onto the
RTV coated appliance flue outlet while rotating the pipe approximately 1/8 of a turn. Inspect and apply RTV
to the inside and outside of the plastic to stainless steel joints to provide a continuous water and gas tight
assembly.
5. Drill a pilot hole through the top of the 4" coupling or elbow socket and into the stainless steel appliance flue
outlet and attach with a sheet metal screw (stainless steel screws are recommended). Repeat this step
adding a sheet metal screw to each side of this first coupling or elbow socket to positively attach the fitting to
the flue outlet. Do not drill or use a screw in the bottom of the flue connector or pipe, as condensate might
drip from this point.
6. Vent support – The vent system should be supported at intervals no greater than six feet, to prevent sagging
and distortion.
