Venting - Rinnai V2532FFU Series Operation & Installation Manual

I N S TA L L E R ' S I N S TA L L AT I O N I N S T R U C T I O N S
The maximum allowable "Equivalent Length (D)" of vent pipe for the Rinnai water heater
is 41 feet (as determined using the formula below). If "D" is greater than 41, the vent/air
intake piping is too long or there are too many elbows, redesign the vent pipe run.
D = L + (B x 6) + (B
90
To help prevent condensation in the vent/air intake piping, the combustion fan has two dip
switch settings. Dip switch number 1 is shipped from the factory set to the "OFF" position; this
is suitable for the maximum vent/air intake length.
Depending upon the vent/air intake length, Dip switch No. 1 may need to be adjusted to
compensate fan speed. Read the following instructions, to determine which position this switch
should be placed in.
When the Equivalent Length of vent pipe, D, is more than 22 feet, leave dip switch
number 1 in the "OFF" position.
When the Equivalent Length of vent pipe, D, is 22 feet or less, dip switch number 1 must
be moved to the "ON" position.
Dip switch # 1 is located in the top row of dip switches, 1 through 8 on the PC board. See the
diagram below to identify the proper switch. If you do not understand the following information,
contact your installer or dealer for assistance.
Do not alter dip switch number 1 before using formula, to determine the proper setting.
Example #1:
You have 6 feet of vent pipe, and two 90° elbows.
D = 6 + (2 x 6) + (0 x 1.5)
D = 18 Dip switch number 1 should be "ON"
Example #2:
You have 15 foot of vent pipe, one 90° elbow and two 45° elbows.
D = 15 + (1 x 6) + (2 x 1.5)
D = 24 Dip switch number 1 should be "OFF"
Warning: All other dip switches with the exception of dip switch No.1, shown in the diagram
above, MUST NOT be altered. Unauthorized adjustments can cause property
damage, personal injury, scalding, or death.
Rinnai America
x 1.5)
45

Venting

D = Total Equivalent Length of vent system.
L = Length of vent/air intake in feet.
B = Number of 90° elbows.
90
B = Number of 45° elbows.
45
36
Vent/air intake
piping length
FF Models