PLATINUM
WATER HEATER
14
PV500-37C 06/12
6.3
Remote Air Piping of Multiple Units
Remote air piping for Multiple PLATINUM
models must not be connected into a common duct or breeching.
Remote outside combustion air for each unit must be independently piped in accordance with the instructions for
either horizontal or vertical remote air systems.
Combustion air supplied from outdoors must be free of contaminants (see Combustion and Ventilation Air). To
prevent recirculation of flue products in to the combustion air inlet, follow all instructions in this section. Follow all
requirements in the General “Venting” section of this manual and other instructions and markings for venting flue
products to the outdoors, obtaining adequate combustion and ventilation air and general installation instructions.
6.4
Maximum Allowed Remote Combustion Air Inlet Length (Equivalent Length)
Maximum equivalent length of combustion air inlet must not exceed the length identified in the table below:
Combustion Air Inlet
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 combustion air inlet 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 inlet system by the equivalent length of straight pipe specified in
table above.
C. Multiply the number of 45° elbows used in inlet 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
inlet length identified in table above.
Example: How many equivalent feet is a 4" combustion air inlet system of 25 ft. of straight pipe and (2) 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 inlet. (Acceptably less than the 100 foot inlet length allowed.)
6.5
Combustion Air Inlet Construction and Assembly
1. Clean and deburr PVC pipe ends and the joint area and trial assemble the vent before joining with PVC
cement, following the PVC cement manufacturer’s instructions for making sound air and water tight joints.
2. Inlet support – The inlet piping system should be supported at intervals no greater than six feet, to prevent
sagging and distortion.
3. Attach to the outdoor end of the PVC inlet pipe to the required UL listed termination that is supplied with the
PLATINUM
water heater. This termination is required for proper operation and no substitution is allowed
6.6
Horizontal and Vertical Remote Combustion Air Inlet Piping Through a Wall or Roof
1. The solid PVC inlet pipe must be sealed to the wall or roof at the point where it passes through the wall or
roof, to prevent flue rain, insects or flue products from entering the living space.
2. The inlet air cap supplied with the optional remote air intake package MUST be used to adequately protect
the air inlet from wind and weather. Do not substitute other caps.
