Rinnai Ru98E Reu Kb3237Wd Us Design Manual Hot Water Rev D

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Hot Water System

Design Manual

Plumbing schematics for single

and multiple Rinnai tankless

water heaters in use with

domestic systems, recirculation,

and storage tanks.

2 R-TRWH-E-02 Rev D

Certifications ................................................................ 3, 4

Rinnai Accessories ......................................................... 4

MSB Kits for Connecting Multiple Water Heaters ........ 5

Model Applicability .......................................................... 6

Water Quality and Scale ................................................. 7

Pump Sizing for Circulation ........................................... 8

Tank Water Heaters in a Circulation Loop .................... 9

Additional Guidelines ..................................................... 9

Vent Termination Clearances ....................................... 10

Additional Clearances ................................................... 12

Pump Sizing for Storage Tank Applications .............. 14

Pressure Loss Curves - Non Condensing Models ..... 15

Pressure Loss Curves - Condensing Models ............. 16

Condensing Water Heaters

Drawing No. Description

CWH1 1 Basic Piping ................................... 17

CWH2 2 Basic Piping ................................... 18

CWH3 3 Basic Piping ................................... 19

CWH6 6 Basic Piping ................................... 20

CWH1-C 1 Circulation System ........................ 21

CWH2-C 2 Circulation System ........................ 22

CWH3-C 3 Circulation System ........................ 23

CWH6-C 6 Circulation System ........................ 24

CWH1-BC 1 Backup Storage ............................. 25

CWH2-BC 2 Backup Storage ............................. 26

CWH3-BC 3 Backup Storage ............................. 27

CWH6-BC 6 Backup Storage ............................. 28

Non-condensing Water Heaters

Drawing No. Description

WH1 1 Basic Piping ................................... 29

WH2 2 Basic Piping ................................... 30

WH3 3 Basic Piping ................................... 31

WH6 6 Basic Piping ................................... 32

WH1-D 1 Freeze Protection .......................... 33

WH2-D 2 Freeze Protection .......................... 34

WH3-D 3 Freeze Protection .......................... 35

WH6-D 6 Freeze Protection .......................... 36

WH1-RGE 1 Optional Recirculation ................... 37

WH1-R 1 Optional Recirculation ................... 38

WH1-CD-O 1 Preferred Demand Circulation ....... 39

WH1-CD 1 Preferred Demand Circulation ....... 40

WH2-CP 2 Circulation System ........................ 41

WH3-CP 3 Circulation System ........................ 42

WH6-CP 6 Circulation System ........................ 43

WH1-BC 1 Backup Storage ............................. 44

WH2-BC 2 Backup Storage ............................. 45

WH3-BC 3 Backup Storage ............................. 46

WH6-BC 6 Backup Storage ............................. 47

WH1-AHU 1 Hydronic Furnace .......................... 48

WH1-AHU-RES 1 Hydronic Furnace and

Heat Exchanger............................. 49

WH1-A1-CD 1 Demand Circulation with 1 Rinnai

Hydronic Furnace .......................... 50

WH2-A1-CD 1 Combination System with 2 Rinnai

Hydronic Furnaces ........................ 51

WH1-AH 1 Generic Air Handler ....................... 52

WH1-S-1 1 Solar Backup ................................. 53

Maintenance Procedure

WH1-F 1 Flush Procedure ............................ 54

Legend ......................................................................... 55

Table of Contents

3 R-TRWH-E-02 Rev D

Certifications

The models listed above have received the following certifications except where noted:

Certified to applicable U.S.

standards for appliances using

gas or other petroleum fuel.

Certified to applicable Canadian

standards for appliances using

gas or other petroleum fuel.

Certified by the Uniform

Plumbing Code (UPC)

Certified by National Sanitation

Foundation (NSF), www.nsf.org

(indoor models must use the

NSF approved top guard)

REU-VAM1620W is not NSF

approved

Energy efficiency certified by

Gas Appliance Manufacturers

Association (GAMA),

www.ahrinet.org

Meets the California Energy

Commission (CEC) standards

Meets California and Texas NOX

emission rules

Approved by the Commonwealth

of Massachusetts

Approved for installations in New

York City

Trade Name CSA Listing Trade Name CSA Listing

* authorized for commercial use



Energy Star Qualified

Indoor Water Heaters Outdoor Water Heaters

V53e, RV53e ...........REU-VAM1620W-US-(N, P)



R63LSe ...................REU-VA2024WD-US-(N, P) *

R63LSe2 .................REU-VA2024WD(A)-UC-(N, P) *



R75LSe, RL75e ......REU-VB2528WD-US-(N, P) *



R75LSe ...................REU-VA2528WD(A)-UC-(N, P) *



R75LSe ...................REU-VA2528WD(A)-US-(N, P) *

R75LSe ...................REU-VA2528WD-US-(N, P) *

R94LSe, RL94e ......REU-VB2735WD-US-(N, P) *



R94LSe ...................REU-VA2535WD-UC-(N, P) *



R94LSe ...................REU-VA2535WD-US-(N, P) *

R98LSe ...................REU-VA3237W-US-(N, P) *

R98LSeASME .........REU-VA3237W-ASME-(N, P) *

R42e .......................REU-V1616W-US-(N, P)

C42e .......................REU-V1616WC-US-(N, P) *

R53e .......................REU-V2020W-US-(N, P)

C53e .......................REU-V2020WC-US-(N, P) *

R70e .......................REU-V2526W-US-(N, P)

R85e .......................REU-V2532W-US-(N, P)

C85e .......................REU-V2532WC-US-(N, P) *

R85ePLUS ..............REU-V2532WD-US-(N, P)

C85ePLUS ..............REU-V2532WCD-US-(N, P) *

R98e .......................REU-V3237W-US-(N, P)

C98e .......................REU-V3237WC-US-(N, P) *

R98eASME .............REU-V3237W-ASME-(N, P)

C98eASME .............REU-V3237WC-ASME-(N, P) *

RC80HPe, RC80e ...REU-KA2530WD-US-(N, P)*



RC98HPe, RC98e ...REU-KA3237WD-US-(N, P)*



V53i, RV53i ........... REU-VB2020FFU-US-(N, P)



R50LSi .................. REU-VA2019FFUD-US-(N, P) *



R75LSi, RL75i ...... REU-VB2528FFUD-US-(N, P) *



R75LSi .................. REU-VA2528FFUD(A)-UC-(N, P) *



R75LSi .................. REU-VA2528FFUD(A)-US-(N, P) *

R75LSi .................. REU-VA2528FFUD-US-(N, P) *

R94LSi, RL94i ...... REU-VB2735FFUD-US-(N, P) *



R94LSi .................. REU-VA2535FFUD-UC-(N, P)*



R94LSi .................. REU-VA2535FFUD-US-(N, P)*

R98LSi .................. REU-VA3237FFU-US-(N, P) *

R98LSiASME ........ REU-VA3237FFU-ASME-(N, P) *

R53i ...................... REU-V2520FFU-US-(N, P)

C53i ...................... REU-V2520FFUC-US-(N, P) *

R53i ...................... REU-V2520FFUD-US-(N, P)

C53i ...................... REU-V2520FFUCD-US-(N, P) *

R85i ...................... REU-V2532FFU-US-(N, P)

C85i ...................... REU-V2532FFUC-US-(N, P) *

R85iPLUS ............. REU-V2532FFUD-US-(N, P)

C85iPLUS ............. REU-V2532FFUCD-US-(N, P) *

R98i ...................... REU-V3237FFU-US-(N, P)

C98i ...................... REU-V3237FFUC-US-(N, P) *

R98iASME ............ REU-V3237FFU-ASME-(N, P)

C98iASME ............ REU-V3237FFUC-ASME-(N, P) *

RC80HPi, RC80i .. REU-KA2530FFUD-US-(N, P)*



RC98HPi, RC98i .. REU-KA3237FFUD-US-(N, P)*



Energy Star Qualified (models

indicated with



)

4 R-TRWH-E-02 Rev D

MSB Controller: The MSB kits can electronically connect up to 25 water heaters and allows them to function as

one hot water source. For use with Rinnai Tankless Water Heaters (except for models V53e,

V53i, and R63LSe which must use pressure activation valves, PVA). Refer to the information in

the next section for components.

EZConnect™ : The EZConnect™ cable is an optional accessory that electronically connects 2 water heaters

and allows them to function as one hot water source.

PVA Valves: Pressure activated valves that allow each water heater (max 5) to turn on as necessary to meet

the demand for hot water. A PVA valve is also useful when dedicating one Rinnai in a multiple

Rinnai system for hot water circulation. The PVA valve will allow flow from the cold water supply

to the dedicated unit when a differential pressure is exerted on the PVA valve due to domestic

demand.

Remote Controllers: MC-91-1US - Controller included with the unit except for the V53e and V53i.

MCC-91-1US - For commercial and hydronic applications allowing temperatures above 140º F.

MC-100V-1US - Deluxe controller

BC-100V-1US - Bathroom controller

Rinnai is continually updating and introducing new products and accessories. For the latest information, contact

Rinnai at 1-800-621-9419, FAX: 1-888-474-6624, or www.rinnai.us.

Certifications

Rinnai Accessories

Multiple Unit Connections (refer to model applicability)

• Do not install both the EZConnect™ and the MSA/MSB packs because they are not designed to

operate together.

• Water heaters connected with the EZConnect™ Cable or the MSA/MSB packs cannot be used

for the bathfill function.

• Temperature settings can only be changed on the controller for the primary unit.

• Do not use the EZConnect™ or MSA/MSB packs with storage tank applications.

Guidelines for

multiple unit

connections:

Rinnai Installation Kits - Valve kits provide isolation valves (for hot and cold lines) and a pressure relief valve. Models

RV53e, RV53i, RL75i/e, RL94i/e, RC80i/e, and RC98i/e include isolation valves and a

pressure relief valve.

Recess Boxes: Recesses unit into the wall, protecting and hiding the unit from view

Pipe Covers: For security, weather protection, and finished look

R

These models are built in accordance with the requirements of the ASME Boiler and

Pressure Vessel Code and received the Certificate of Authorization from the National

Board. The heat exchanger has the NB and the HLW stamps.

R98LSiASME

R98LSeASME

R98iASME

C98iASME

R98eASME

C98eASME

WRIK-LF-F Valve kit (for models rated below 200,000 Btuh), Lead Free, 3/4” - E2 version,

FNPT X FNPT, (threaded)

WRIK-LF-32F Valve kit (for models rated above 200,000 Btuh), Lead Free, 3/4” - E2 version,

FNPT X FNPT, (threaded)

104000059 Freeze Protection Solenoid Valve Kit

5 R-TRWH-E-02 Rev D

No. of

water

heaters

No. of water

heaters for

each bank

MSB-M MSB-C1

See

note *

MSB-C2 MSB-C3

See

note *

2** 2 1 NA NA 1

3 3 1 1 NA 2

4 4 1 2 NA 3

5 5 1 3 NA 4

6 3/3 2 2 1 4

7 4/3 2 3 1 5

8 4/4 2 4 1 6

9 5/4 2 5 1 7

10 5/5 2 6 1 8

11 4/4/3 3 5 2 8

12 4/4/4 3 6 2 9

13 5/4/4 3 7 2 10

14 5/5/4 3 8 2 11

15 5/5/5 3 9 2 12

16 4/4/4/4 4 8 3 12

17 5/4/4/4 4 9 3 13

18 5/5/4/4 4 10 3 14

19 5/5/5/4 4 11 3 15

20 5/5/5/5 4 12 3 16

21 5/4/4/4/4 5 11 4 16

22 5/5/4/4/4 5 12 4 17

23 5/5/5/4/4 5 13 4 18

24 5/5/5/5/4 5 14 4 19

25 5/5/5/5/5 5 15 4 20

Number of Kits Required MSB Kits - Parts Needed

Use the table to determine the type and

number of kits necessary for your system.

Up to 5 water heaters can be connected

together using the MSB-M and MSB-C1 kits.

When over 5 water heaters are connected

together, MSB-M control boards are

connected using MSB-C2 kits.

If multiple MSB-M control boards are used,

then at least three water heaters should be

connected to each MSB-M. Example: With 7

water heaters, one MSB-M should control 4

water heaters and the other MSB-M should

control 3 water heaters.

Detailed installation instructions are provided

with each of the kits.

* VA, VB, and KA (Condensing) models use

the MSB-M, MSB-C1, and MSB-C2 cables

V Series models use the MSB-M, MSB-C2,

and MSB-C3 cables. V Series models

must use the MSB-C3 cables instead of

the MSB-C1 cables and the Cable A in the

MSB-M.

** The Rinnai EZConnect™ is less expensive

and is specifically designed for connecting

2 water heaters. Applicable models are

VA, VB, KA, and V3237.

MSB Kits for Connecting Multiple Water Heaters

Each bank is controlled by an MSB-M control board. These boards are

connected to each other with MSB-C2 cables. One MSB-M is the

controlling or master MSB-M for the entire system.

M MSB-M control board

A Connector cable A (part of MSB-M kit; replace with MSB-C3

cables for V Series)

C1 MSB-C1 cable for connecting water heaters within a banked

system (up to 5), (use MSB-C3 cables for V Series)

C2 MSB-C2 cable for connecting MSB-M control boards (up to 5)

M

A

C2

C1

Water Heater

PC board

6 R-TRWH-E-02 Rev D

Outdoor

Indoor

Model Recess Boxes Pipe Covers Electronic

Connection Remote

Controllers

V53e, RV53e RGB-20-U PC-20-W (white) [6] [1]

R63LSe2 PCD01-SM2 (silver) [2]

R75LSe, RL75e,

R94LSe, RL94e

RGB-25-U

or

RGB-25U-MSAL

(with moisture

seal flange)

PCD03-SM2 (silver) [2]

R98LSe, R98LSeASME RGB-32 PC-32-W (white)

PC-32-G (gray) [2]

RC80HPe, RC80e,

RC98HPe, RC98e RGB-CTWH PCD07 [2]

EZConnect™ [5],

MSA-2, MSB

Model Venting Type

Integrated

Condensate

Collector

Electronic

Connection Remote

Controllers

V53i, RV53i

R50LSi

R75LSi, RL75i,

R94LSi, RL94i

Concentric 3” / 5”

[4]

YES

EZConnect™

[5],

MSA-2, MSB

[2]

4” for intake and

4” for exhaust

[4] NO [3]

R98LSi, R98LSiASME [2]

RC80HPi, RC80i,

RC98HPi, RC98i Concentric 3” / 5”

[4] YES [2]

[1] MC-91, MC-100, BC-100

[2] MC-91, MC-100, BC-100, MCC-91

[3] The Condensate Collector vent piece and the Condensate Trap (224050) for trapping and draining condensate may

be required depending on your installation. Refer to the Operation and Installation Manual.

[4] Refer to the Operation and Installation Manual

[5] The EZConnect™ will connect a maximum of 2 water heaters.

[6] Electronic connection is not available for this model. Connection can be made using pressure activating Rinnai PVA

valves.

Notes

Model Applicability (Accessories)

7 R-TRWH-E-02 Rev D

Water Quality and Scale

A complete water analysis and an understanding

of system requirements are needed to protect the

Rinnai tankless water heaters and water heating

systems from scale. Water analysis shows

whether water is hard or soft. Hard water, unless

treated, will cause scaling or liming of the Rinnai

heat exchanger.

The rate of scaling increases with temperature

and usage because calcium carbonate and other

scaling compounds lose solubility (fall out of

solution) at higher temperatures. For example,

for every 20°F over 140°F, the rate of scale

increases by a factor of 2 (See figure below).

Reference target water quality levels below and

treat the water if these levels are exceeded.

* Source 2003 ASHRAE Handbook HVAC Applications

210

180

150

120

90

60

30

0

3900

3300

2700

2100

1500

900

300

0

WATER USAGE, gal/day

LIME DEPOSITED, lb/yr

180°F

170°F

160°F

150°F

140°F

120°F

BASED ON 10 grains/gal HARDNESS

*

Consideration of care for your water heater should

include evaluation of water quality.

Water that contains chemicals exceeding the

levels shown in the table affect and damage the

heat exchanger. Replacement of the heat

exchanger due to water quality damage is not

covered by the warranty.

If you live in an area that is known to have hard water

or that causes scale build-up you must treat your

water and/or flush the heat exchanger regularly.

When scale build-up in the heat exchanger begins to

affect the performance of the water heater, a

diagnostic code “LC” will display. Flush the heat

exchanger to prevent damage to it. Scale build up is

caused by hard water set at a high temperature.

Maximum Level

Total Hardness Up to 200 mg / L

Aluminum * Up to 0.2 mg / L

Chlorides * Up to 250 mg / L

Copper * Up to 1.0 mg / L

Iron * Up to 0.3 mg / L

Manganese * Up to 0.05 mg / L

pH * 6.5 to 8.5

TDS (Total Dissolved

Solids) * Up to 500 mg / L

Zinc * Up to 5 mg / L

* Source: Part 143 National Secondary Drinking Water

Regulations

8 R-TRWH-E-02 Rev D

Pump Sizing for Circulation

1. Use the chart below or one appropriate for your conditions to determine the heat loss in the length of the hot water

supply and return piping. For example, 100 ft of 1-1/2 in bare copper tubing results in a heat loss of 5300 Btu/h.

2. Determine the acceptable temperature drop at the last fixture in the loop. For example, if the supply temperature from

the water heater is 120 ºF (49 ºC) and an acceptable temperature at the last fixture is 100 ºF (38 ºC) then the

acceptable temperature drop is 20 ºF (7 ºC).

3. Calculate the required pump flow rate using the following formula:

FLOW RATE (gpm) = HEAT LOSS (BTU / h)

500 X ACCEPTABLE TEMPERATURE DROP (ºF )

4. Based on the above calculations select a pump for the type of circulation system you will be utilizing:

A). Optional Method (reference drawing WH1-RGE) - Reference pump manufacturers flow vs. pressure

specifications to select a pump that can provide the flow rate calculated above while overcoming the

pressure loss through:

• Tank water heater (reference manufacturer’s information)

• All building supply and return plumbing in the circulation loop (reference local plumbing codes,

standards, or practices)

B). Preferred Method (WH1-CD-O, WH1-CD) - Reference pump manufacturers flow vs. pressure specifications

to select a pump that can provide 3 gpm of flow or the flow rate calculated above, whichever is greater, while

overcoming the pressure loss through:

• Rinnai tankless water heater (reference flow vs. pressure curve of the Rinnai model being used)

• Optional storage tank (reference manufacturer’s information)

• All building supply and return plumbing in the circulation loop (reference local plumbing codes,

standards, or practices)

NOTE: Only use pumps of brass, bronze, or stainless steel construction. Do not use pumps of iron construction as

they will oxidize and clog the inlet filter on the appliance. The pump should be controlled by an aquastat,

timer, or combination of the two. A demand control (motion sensor, push button, or door contact) may also

be used.

Nominal Size, in. Bare Copper Tubing,

Btu/h-ft 1/2 in. Glass Fiber Insulated

Copper Tubing, Btu/h-ft

3/4 30 17.7

1 38 20.3

1-1/4 45 23.4

1-1/2 53 25.4

2 66 29.6

2-1/2 80 33.8

3 94 39.5

4 120 48.4

Approximate Heat Loss from Piping at 140 ºF Inlet, 70 ºF Ambient *

* Source: 2011 ASHRAE Handbook HVAC Applications

9 R-TRWH-E-02 Rev D

Tank Water Heaters in a Circulation Loop

The following applies when using a tank water heater (gas or electric) to provide heat for a circulation loop. Drawing

WH1-RGE is an example.

The heat output of the tank must be equal to or greater than the calculated circulation loop heat loss.

(Reference page 7, Step 1 on calculating heat loss).

Electric Tank Water Heater

Since the input and output are the same for an electric tank water heater, this can be expressed as:

Electric Tank Input (Kw) > Circulation loop heat loss (Btuh)

3413

(1 Kilowatt = 3,413 BTU)

Gas Tank Water Heater

When using a gas style water heater, the efficiency of the tank must be taken into account.

Available Btuh output = (Btu input of tank) x (efficiency) > Circulation loop heat loss (Btuh)

Example:

30,000 Btuh input gas tank

0.62 EF

30,000 x .62 = 18,600 available Btuh output

Additional Guidelines

Rinnai water heaters not recovering a storage tank: In applications involving a commercial dishwasher, a hot water

circulation loop feeding the dishwasher is required.

Rinnai water heater recovering a storage tank: In applications involving a commercial dishwasher, a hot water

circulation loop feeding the dishwasher may be required depending on the distance between the dishwasher and the

storage tank. Refer to local codes when determining the need for circulation loops to dishwashers.

When using a Rinnai product as the heat source for a circulation loop, the piping systems should be designed with a hot

water circulation loop having a minimum circulating flow rate of 3 gpm. You must also review pressure drop curves for

the Rinnai when sizing circulators.

Rinnai water heaters cannot be used in applications requiring 180º-195º F water at a DISHWASHER, unless a booster

heater capable of producing 180º-195º F water is provided at the dishwasher. The Rinnai water heater is not to be used

as a booster water heater in these applications.

For beauty salon applications, a hot water circulation loop feeding the head wash stations is highly recommended. This

provides instant hot water to the head wash stations and reduces the possibility of cold bursts at the stations. (Refer to

the piping schematics in this manual.) Insulation of circulation piping is also recommended for heat retention.

Exhaust gases from beauty salon applications and fume hoods of commercial dish washers with chemical sanitizers can

be highly corrosive and may cause premature failure of water heater components. Care must be taken to ensure that

the water heater and vent termination are installed away from that area. An uncontaminated supply of combustible air

must be maintained for optimum performance of the water heater.

If the intended installation is located in hard water area, a softener or similar water treatment system must be used.

Always remember to perform routine maintenance.

For any applications requiring temperatures above 140º F, an MCC-91 temperature controller must be purchased

separately.

10 R-TRWH-E-02 Rev D

INSIDE

CORNER DETAIL

FIXED

CLOSED

OPERABLE

FIXED

CLOSED

OPERABLE

B

B

B

A

J

BM

C

F

B

B

E

D

L

G

A

H

K

I

X

V

AIR SUPPLY INLET

VENT TERMINAL

AREA WHERE

TERMINAL IS NOT

PERMITTTED

SNOW

TERMINATION

Clearance in

Ref. A also

applies to

anticipated

snow line

Vent Termination Clearances

11 R-TRWH-E-02 Rev D

Ref Description Canadian Installations US Installations

A Clearance above grade, veranda, porch,

deck, or balcony 12 inches (30 cm) 12 inches (30 cm)

B Clearance to window or door that may be

opened 36 inches (91 cm) 12 inches (30 cm)

C Clearance to permanently closed window * *

D

Vertical clearance to ventilated soffit,

located above the terminal within a

horizontal distance of 2 feet (61 cm) from

the center line of the terminal

* *

E Clearance to unventilated soffit * *

F Clearance to outside corner * *

G Clearance to inside corner * *

H Clearance to each side of center line

extended above meter/regulator assembly

3 feet (91 cm) within a

height 15 feet (4.5 m)

above the meter/

regulator assembly

*

I Clearance to service regulator vent outlet 36 inches (91 cm) *

J Clearance to nonmechanical air supply

inlet to building or the combustion air inlet

to any other appliance 36 inches (91 cm) 12 inches (30 cm)

K Clearance to a mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if

within 10 feet (3 m)

horizontally

L Clearance above paved sidewalk or

paved driveway located on public property 7 feet (2.13 m) 1 *

M Clearance under veranda, porch, deck, or

balcony 12 inches (30 cm) 2 *

NOTE: An outdoor water heater with integral vent and intake is functionally similar to a direct vent

product in that the combustion air is drawn from the outside and the flue products are vented to the

outside. These clearances apply to indoor and outdoor water heaters.

1 A vent shall not terminate directly above a sidewalk or paved driveway that is located between two

single family dwellings and serves both dwellings.

2 Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath

the floor.

∗ For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearances are in

accordance with local installation codes and the requirements of the gas supplier.

Vent Termination Clearances

12 R-TRWH-E-02 Rev D

2"

36"

12"

60"

These clearances are to supplement the clearances specified in ANSI Z223.1 which are currently in the

FFU (indoor) and W (outdoor) manuals. They apply to all water heater models. Local codes supersede

these recommendations.

General Recommendations

• Avoid termination locations near a dryer vent. (See TB-46 for more information.)

• Avoid termination locations near commercial cooking exhaust.

W (Outdoor) Models

(0.30 m) to an

inside corner

(50 mm) between Rinnai units at same level

(0.91 m) to ventilated or unventilated soffit or eve vent; or to a

deck or porch

(1.52 m) vertically between Rinnai terminals

Additional Clearances

13 R-TRWH-E-02 Rev D

12"

12"

36"

INSIDE

CORNER

Termination of FFU (Indoor) Models

60"

12"

(0.91 m) to ventilated

or unventilated soffit

or eve vent; or to a

deck or porch

(0.30 m) between

Rinnai terminals at

same level

(1.52 m) between

Rinnai terminals

at different levels

(0.30 m ) to an

inside corner

(0.30 m) between

Rinnai terminals at

same level

24"

(0.61 m) to wall or parapet

60" (1.52 m) vertically

between Rinnai terminals

Additional Clearances

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The following applies when using Rinnai tankless water heaters to recover a storage tank. Drawing WH1-BC is an

example.

Rinnai Tankless water heaters have a pressure loss which must be considered in the system design. Reference the

pressure loss curve for the Rinnai model being used to determine the pump size for the desired recovery rate.

For recommended pump sizes use the table below. Additional pressure losses in plumbing between the Rinnai(s) and

the storage tank must also be taken into consideration.

The specified pump size is to provide maximum recovery of the storage tank. A smaller pump size may be used, but

could result in longer recovery time of the tank. Please contact the engineering department with any questions on pump

sizing.

NOTE: Only use pumps of brass, bronze, or stainless steel construction. Do not use pumps of iron construction as

they will oxidize and clog the inlet filter on the appliance.

Pump Sizing for Storage Tank Application

Pump Flow Requirements

Number of Rinnai

Water Heaters

R94LSi/e, RL94i/e

R98LSi/e(ASME)

RC80HPi/e, RC80i/e

RC98HPi/e, RC98i/e

R/C53i(PLUS)

R70e

R75LSi/e, RL75i/e

V53e, RV53e

V53i, RV53i

R50LSi

R63LSe2

1 6 gpm @ 30' head 5 gpm @ 25' head 4 gpm @ 25' head

2 12 gpm @ 30' head 10 gpm @ 25' head 8 gpm @ 25' head

3 18 gpm @ 30' head 15 gpm @ 25' head 12 gpm @ 25' head

4 24 gpm @ 30' head 20 gpm @ 25' head 16 gpm @ 25' head

5 30 gpm @ 30' head 25 gpm @ 25' head 20 gpm @ 25' head

6 36 gpm @ 30' head 30 gpm @ 25' head 24 gpm @ 25' head

7 42 gpm @ 30' head 35 gpm @ 25' head 28 gpm @ 25' head

8 48 gpm @ 30' head 40 gpm @ 25' head 32 gpm @ 25' head

9 54 gpm @ 30' head 45 gpm @ 25' head 36 gpm @ 25' head

10 60 gpm @ 30' head 50 gpm @ 25' head 40 gpm @ 25' head

11 66 gpm @ 30' head 55 gpm @ 25' head 44 gpm @ 25' head

12 72 gpm @ 30' head 60 gpm @ 25' head 48 gpm @ 25' head

13 78 gpm @ 30' head 65 gpm @ 25' head 52 gpm @ 25' head

14 84 gpm @ 30' head 70 gpm @ 25' head 56 gpm @ 25' head

15 90 gpm @ 30' head 75 gpm @ 25' head 60 gpm @ 25' head

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0

10

20

30

40

50

60

70

80

90

100

0

5

10

15

20

25

30

35

40

45

0 1 2 3 4 5 6 7 8 9 10 11

Pressure Loss Curves - Non Condensing Models

Pressure Loss (psi)

Pressure Loss (ft head)

Water Flow (gpm)

R98LSi/e

R98LSi/eASME

R94LSi/e

RL94i/e

R75LSi/e

RL75i/e

R63LSe

R50LSi

0

10

20

30

40

50

60

70

80

90

100

0

5

10

15

20

25

30

35

40

45

0 1 2 3 4 5 6

V53e

RV53e

V53i

RV53i

Pressure Loss (ft head)

Pressure Loss (psi)

Water Flow (gpm)

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Pressure Loss Curves - Condensing Models

RC98HPi/e

RC98i/e

Pressure Loss (ft head)

Water Flow (gpm)

Pressure Loss (psi) )

RC80HPi/e

RC80i/e

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Solar Backup

Solar Backup

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Flush Procedure

Single Unit Flush Procedure

1. Disconnect electrical power to the water heater.

2. Close the shutoff valves on both the hot water

and cold water lines (V3 and V4).

3. Connect pump outlet hose (H1) to the cold water

line at service valve (V2).

4. Connect drain hose (H3) to service valve (V1).

5. Pour 4 gallons of undiluted virgin, food grade,

white vinegar into pail.

6. Place the drain hose (H3) and the hose (H2) to

the pump inlet into the cleaning solution.

7. Open both service valves (V1 and V2) on the hot

water and cold water lines.

8. Operate the pump and allow the cleaning solution

to circulate through the water heater for at least 1

hour at a rate of 4 gallons per minute (15.1 liters

per minute).

9. Turn off the pump.

10. Rinse the cleaning solution from the water heater

as follows:

a. Remove the free end of the drain hose (H3)

from the pail. Place in sink or outside to drain.

b. Close service valve, (V2), and open shutoff

valve, (V4). Do not open shutoff valve, (V3).

c. Allow water to flow through the water heater

for 5 minutes.

d. Close shutoff valve (V4). When unit has

finished draining remove the in-line filter at the

cold water inlet and clean out any residue.

Place filter back into unit and open valve (V4).

e. Close service valve, (V1), and open shutoff

valve, (V3).

11. Disconnect all hoses.

13. Restore electrical power to the water heater.

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8/2011

© 2011 Rinnai America Corporation