Rinnai RU98i Installation Manual download pdf (Page 21)

21 Rinnai CVent

Installaon Instrucons

Recommended Spacing of Water Heaters

Spacing of the water heaters is crical for the common vent

system to mounng easily and securely. The collectors are

made for 20.5” spacing (center line to center line) between

water heaters. If a dierent spacing is needed, please

contact Rinnai concerning your applicaon. Rinnai

recommends using our Tankless Rack System (TRS) which is

designed for 20.5” spacing. Our engineered system is

designed to make installaon simple which greatly reduces

labor me and the chance of miscalculaons.

Custom Water Heater Spacing

If common venng with LESS than 20.5” between water heaters:

• The installer assumes all responsibility of following local codes. Inspectors can reject the installaon if the

rang plate cannot be seen for all water heaters.

• D4 Extension Pieces must be cut appropriately to maintain the required 3° slope.

If common venng with GREATER than 20.5” between water heaters:

• The installer must purchase a vent extension cut to the appropriate length between the collectors.

• The length of each addional vent extension must be considered in the maximum allowable vent length.

• D4 Extension Pieces must be cut appropriately to maintain the required 3° slope.

NOTE: Never attempt to cut or modify the

collectors.

To maintain a 3° slope, use the following

formula to calculate D4 Extension Piece

length (L):

(L) = (water heater spacing) X 0.05

Example: if the adjacent water heater is

20.5” away

Length (L) = 20.5” x 0.05 = 1.02”

Example: if the adjacent water heater is

26” away

Length (L) = 26.0” x 0.05 = 1.30”

Vent extension -

cut to size

Air Intake -

extension

D4 Extension

Piece

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Rinnai RU98i Installation Manual Page 21