Rinnai RTBRACKA User manual

• Part #: RTBRACKA
• Rack Weight: 35.5 lb (16 kg)
(Assembled)
• Example Configurations1:
Fig. 1. Rack Types, Part Numbers and Weights.
This document explains how to:
• Assemble the Tankless Water Heater and Boiler Free-Standing Rack (Standard and Low Profile
versions) (Fig 1).
• Assemble the Add-On Extension Kit (if purchased) (Fig 1).
• Attach the tankless water heater or boiler (purchased separately) to the rack.
• Part #: RTBRACKS
• Rack Weight: 33 lb (15 kg)
(Assembled)
• Example Configurations1:
Top Bar Assembly
Middle Crossmember
1 Tankless Water Heater or Boiler is not supplied with the rack and is purchased separately.
1-Unit 2-Units
Back-to-Back
1-Unit 2-Units
Back-to-Back
2-Units
Side-by-Side
with Extension
4-Units
with
Extension
• Part #: RTBRACKExt
• Weight: 11 lb (5 kg)
(Weight of Top Bar Assembly
and Middle Crossmember)
• Example Configurations1:
❶
❷
❶
❷
Extends the width of
the rack to
accommodate:
• Side-by-side
configurations
• Configurations of
two units or more

Tankless Water Heater and Boiler Rack Assembly Instructions 2
The Tankless Water Heater and Boiler Free-Standing Rack and Add-On Extension Kit are compatible
with the following internal (indoor) Rinnai products: SENSEI™ Tankless Water Heaters, I-Series
Condensing Boilers, and M-Series Condensing Boilers (Fig 2).
Supplied:
• Contents inside rack product box (contents are listed in the next section titled “Items Inside
Product Box”).
Field-Supplied:
• Rinnai Tankless Water Heater or Boiler (purchased separately) with supplied mounting bracket
and Installation and Operation Manual.
• Screwdriver, nut driver or wrench for use with screws and bolts listed in the next section titled
“Items Inside Product Box.”
• (Recommended) Four (4) screws/expansion anchors for anchoring rack to floor. Reference local
codes for minimum concrete thickness and use appropriate expansion anchors capable of
supporting the rack system weight and applicable Rinnai tankless water heater or boiler weights.
− For rack weights, see Fig 1 on the first page of this document.
− For tankless water heater or boiler weights, refer to the Installation and Operation Manual
supplied with the unit.
SENSEI™
Tankless Water
Heaters
Images are for illustrative purposes only.
Tankless Water Heaters and Boilers are sold separately.
I-Series
Condensing
Boilers
M-Series
Condensing
Boilers
Compatible Products
Fig. 2. Compatible Products

Tankless Water Heater and Boiler Rack Assembly Instructions 3
Item # Item Qty
1Top Bar Assembly 1
2Vertical Leg Assembly 2
3Middle Crossmember 1
4Foot Assembly 2
5Leg Brace 2
6Carriage Bolt (5/16 in.-18 x 2) 24
7Flange Nut (5/16 in.-18) 12
8HEX Bolt (#10-24 x 5/8 in.) 24
9Thread Cutting Screw
(#10-24 x 3/4 in.)
4
10 Lock Washer 24
Before assembly, please make sure all parts are located inside the product box.
The contents of the Standard Rack and Low Profile Rack are shown below.
The items and quantities are the same for both racks. The only difference is the length of the Vertical
Leg Assembly (item #2 shown below) which is shorter for Low Profile Racks.
Vertical
Leg
Assembly
Leg Brace Carriage Bolt Flange Nut HEX Bolt
Shorter leg
supplied with
Low Profile
Rack.
Taller leg supplied
with Standard Rack.
Item # Item Qty
11 Top Bar Assembly
(Extended Length) 1
12 Middle Crossmember
(Extended Length) 1
8(Item shown above) HEX Bolt
(#10-24 x 5/8 in.) 4
9(Item shown above) Thread
Cutting Screw (#10-24 x 3/4 in.) 8
Top Bar Assembly (Extended Length)
Middle Crossmember (Extended Length)
Top Bar Assembly
Middle Crossmember
The contents of the Add-On Extension Kit (if purchased) are shown below.
Foot Assembly
Thread Cutting Screw Lock Washer

Tankless Water Heater and Boiler Rack Assembly Instructions 4
Follow the instructions below to assemble the
Standard Rack, Low Profile Rack, and Add-On
Extension Kit (if purchased).
1. Insert the Vertical Leg Assembly into the Foot
Assembly and secure with two (2) Carriage
Bolts, two (2) Flange Nuts, and two (2) lock
washers (Fig 3). Repeat this step on the
other side.
2. Attach one Leg Brace to the Vertical Leg
Assembly/Foot Assembly with four (4) Hex
Bolts (Fig 4). Repeat this step on the other
side.
The Leg Brace can attach to the front or
back of the assembly.
Assembled
View:
Foot Assembly
Vertical Leg
Assembly
Leg
Brace
Carriage Bolt
(supplied)
Flange Nut
(supplied)
Hex Bolt
(supplied)
Fig 3. Insert Vertical Leg Assembly into
Foot Assembly.
Fig 4. Attach Leg Brace.
Lock Washer
(supplied)
Flange Nut
Vertical Leg
Assembly
Carriage
Bolt
Foot Assembly
Lock Washer

Tankless Water Heater and Boiler Rack Assembly Instructions 5
4. Attach the Top Bar Assembly to the Vertical
Leg Assemblies with four (4) Carriage Bolts,
four (4) Flange Nuts, and four (4) lock
washers (Fig 6).
IMPORTANT
3. Attach the Middle Crossmember to the
Vertical Leg Assemblies with four (4)
Carriage Bolts, four (4) Flange Nuts, and
four (4) lock washers (Fig 5).
Middle Crossmember (Extended Length)
Supplied with Extension Kit.
If using the optional Add-On Extension Kit,
attach the extended length Middle
Crossmember (supplied with the Extension Kit)
instead of the standard length Middle
Crossmember.
IMPORTANT
Top Bar Assembly (Extended Length)
Supplied with Extension Kit.
If using the optional Add-On Extension Kit,
attach the extended length Top Bar Assembly
(supplied with the Extension Kit) instead of the
standard length Top Bar Assembly.
Assembled
View:
Fig 6. Attach Top Bar Assembly to Vertical Leg
Assemblies.
Fig 5. Attach Middle Crossmember to
Vertical Leg Assemblies.
Vertical Leg
Assemblies
Flange
Nut
Flange
Nut
Carriage
Bolt
Middle
Crossmember
(Standard or
Extended Length)
Assembled
View
Vertical Leg
Assembly
Carriage Bolt
(supplied)
Flange Nut
(supplied)
Lock Washer
(supplied)
Lock
Washer
Carriage Bolt
(supplied)
Flange Nut
(supplied)
Lock Washer
(supplied)
Carriage
Bolt
Top Bar
Assembly
Lock
Washer

Tankless Water Heater and Boiler Rack Assembly Instructions 6
5. (Recommended) Install four (4) screws
and/or expansion anchors (field-supplied)
through the base of the legs to prevent
tipping potential (Fig 7).
Reference local codes regarding minimum
concrete thickness and use appropriate
expansion anchors that are capable of
supporting the rack system weight and
applicable Rinnai tankless water heater or
boiler weights.
• For rack weights, see Fig 1 on the first
page of this document.
• For tankless water heater or boiler
weights, refer to the Installation and
Operation Manual supplied with the
unit.
CAUTION
Fig 7. Install Screws/Anchors Through Rack
Base.
6. Hang the Rinnai Tankless Water Heater or
Boiler onto the rack by following the steps
below:
6A: SENSEI™ Tankless Water Heaters
and I-Series Boilers:
Using two (2) Hex Bolts (supplied), attach
the hanging bracket (supplied with
tankless water heater or boiler) to the
outer through-holes on the left and right
sides of the Top Bar Assembly (Fig 8).
Top Bar Assembly
Outer Through-Hole
Hanging Bracket
Fig 8. Attach the Hanging Bracket (SENSEI™
and I-Series Models).
Hex Bolt
(supplied)

Inner Through-Hole
6B: M-Series Boilers:
Using two (2) Thread Cutting Screws (supplied),
attach the hanging bracket (supplied with boiler)
to the inner through-holes on the left and right
sides of the Top Bar Assembly (Fig 9).
Hanging Bracket
Top Bar
Assembly
7. Hang the tankless water heater or boiler
onto the hanging bracket (Fig 10).
Reference the Tankless Water Heater or
Boiler Installation and Operation Manual for
detailed instructions.
SENSEI™ Tankless Water Heaters
and I-Series Boilers:
M-Series Boilers:
Fig 9. Attach the Hanging Bracket (M-Series
Models)
Fig 10. Hang Tankless Water Heater or
Boiler onto Rack.
Rack assembly instructions are complete.
To continue with installation of the tankless water
heater or boiler (such as connecting the water,
gas or power supply), refer to the Installation and
Operation Manual supplied with the unit.
Contact Rinnai Customer Care at: 1-800-621-9419.
800000165(01)
3/2021
8. For SENSEI™ Tankless Water Heaters or I-Series
Boilers, secure the bottom mounting backet to the
Middle Crossmember using two (2) Hex Bolts
(supplied) (Fig 11).
The Vertical Leg Assemblies contain rivet nuts
(#10-24 thread) on both sides of the rack to
allow for installation of field-supplied unistruts
(Fig 12). Unistruts allow plumbing components
or accessories to be mounted on the rack.
NOTE
Fig 12. Rivet Nuts on Vertical Leg Assemblies.
Thread
Cutting
Screw
(supplied)
Fig 11. Secure Bottom Mounting Bracket.
Middle
Crossmember
Hex
Bolt
(supplied)
Bottom Mounting
Bracket