Tech Bulletin

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1 TB-157(01)

5/2020

Technical Bulletin 157 - Hydraulic Separation Required for Rinnai Boilers

Purpose: To announce that hydraulic separation between the boiler and heating system is required for the I-Series and

M-Series Condensing Boilers (models shown in tables below) except as noted below.

Additional

system pump

Hydraulic Separation (REQUIRED) (primary loop).

Illustration shows primary/secondary piping with a

closely spaced tee.

CORRECT

About Hydraulic Separation: Hydraulic separation uses primary/secondary piping to separate the boiler from the

heating system. Primary/secondary piping creates two connected loops: a primary loop for the boiler and a secondary

loop for the heating system. The boiler loop is connected to the heating system by closely spaced tees or a low loss

header (illustrations on next page). Important: Additional pump(s) are required when using hydraulic separation.

Directly connecting a boiler to a hydronic heating system (without using hydraulic separation) may cause high pressure

losses and low flow conditions within the heating system, thus limiting the performance of the boiler and heating system.

Hydraulic separation using primary/secondary piping helps minimize the potential of operational errors while increasing

flow and improving system and boiler performance.

I-Series Models

Combi:

Solo:

i060C, i090C, i120C

i060S, i090S, i120S, i150S

Piping With Hydraulic

Separation

Heating System

(secondary loop)

Hydraulic separation is not used to separate

the boiler from the heating system (piping

system is directly connected to boiler without

the use of hydraulic separation).

NOT CORRECT

Piping Without

Hydraulic Separation

M-Series Models

Combi:

Solo:

M060C, M090C, M120C, M160C

M060S, M090S, M120S, M160S

~ ~

The images below are not complete piping diagrams; they do not show all valves or piping components. The

images are intended to show piping with and without hydraulic separation. Refer to the Rinnai Boiler Installation

and Operation Manual for complete piping diagrams.

NOTE

Boiler

Addional informaon on next page

Summary of content (3 pages)

PAGE 1
Technical Bulletin 157 - Hydraulic Separation Required for Rinnai Boilers Purpose: To announce that hydraulic separation between the boiler and heating system is required for the I-Series and M-Series Condensing Boilers (models shown in tables below) except as noted below.
PAGE 2
NOTE • • When Rinnai I-Series boilers are in use with Rinnai air handlers, please refer to the Rinnai air handler Installation and Operation Manual for installation and performance details. When an alternate air handler is used with a Rinnai I-Series boiler with no additional heat emitters or an indirect tank: − It is not required to utilize primary/secondary piping. − A minimum of 3 GPM (11 L/min) flow is needed for proper operation of the system.
PAGE 3
Hydraulic Separator Options ❶ Primary-Secondary Heating Kit ❷ Low Loss Header (Field-Supplied) Designed specifically for Rinnai I-Series and M-Series boilers. Primary-Secondary Heating Kit Description Part # I-Series Boiler (Combi Models) 807000212 I-Series Boiler (Heat-Only Models) 807000213 M-Series Boiler (Combi and Heat-Only Models) 803000023 ❸ Closely Spaced Tee (Field-Supplied) Assembled with field components.