Rinnai RHS19980HEXiN Installation guide

Brand: Rinnai

Model: RHS19980HEXiN

Category: Water heaters & boilers

Type: Installation guide

This manual is also suitable for

Demand Duo™ 80

Installaon and Operaon Manual

— Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other

appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any phone in your building.

• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instrucons.

• If you cannot reach your gas supplier, call the re department.

— Installaon and service must be performed by a qualied installer, service agency or the gas supplier.

READ ALL OF THE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR

OPERATING THIS SYSTEM.

(This manual is a supplement to the RL94i Installaon and Operaon

Manual)

This manual provides informaon on the installaon, operaon, and maintenance of

the water heater. For proper operaon and safety, it is important to follow the

instrucons and adhere to the safety precauons.

A licensed professional must install the water heater according to the exact

instrucons in this manual.

The consumer must read the enre manual to properly operate the water heater and

to have regular maintenance performed.

The Commercial Hybrid System is assembled with mulple and separately cered

components consisng of:

• RL94i / RLX94i Tankless Water Heater

• 80 Gallon Storage Tank

• Controller

WARNING

IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY

RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

Commercial Applicaons:

CHS19980HEiP . .......... 80 Gallon, 199,000 BTU

CHS1998HEiN . ............ 80 Gallon, 199,000 BTU

CHS19980HEXiN . ........ 80 Gallon, 192,000 BTU

Residenal Applicaons:

RHS19980HEiP . .......... 80 Gallon, 199,000 BTU

RHS1998HEiN . ............ 80 Gallon, 199,000 BTU

RHS19980HEXiN . ........ 80 Gallon, 192,000 BTU

For Indoor Applicaons Only:

2 Demand Duo™ 80

Safety Behaviors and Pracces for the

Consumer and Installer………………………………….……...3

Installaon Instrucons………………………………………...4

Installer Qualicaons…………………………………....4

Type of Installaon………………………………………....4

Installaon Steps………………………………………..……4

General Instrucons………………………………..……….4

Prepare for Installaon………..………….………..…….5

Installaon of Gas Supply……………………..………...8

Connect Electricity………………………………….…….….9

System Controller…………………………………….…. ..10

Installaon of Plumbing………………………….……..11

Typical Installaons………………………….…………...12

This is the safety alert symbol. This symbol alerts you to potenal

hazards that can kill or hurt you and others.

Indicates an imminently hazardous situaon which, if not avoided, will result in personal

injury or death.

Indicates a potenally hazardous situaon which, if not avoided, could result in personal

injury or death.

Indicates a potenally hazardous situaon which, if not avoided, could result in minor or

moderate injury. It may also be used to alert against unsafe pracces.

DANGER

CAUTION

WARNING

Important Safety Informaon

Safety Denions

Piping Diagram for Basic Installaons……………….… 13

Piping Diagram for Mul-Unit Installaons……….….14

Direct Vent Terminal Clearances………………….……....16

Venng Guidelines………………………………………......….17

Condensate………………………………………………........…..19

Final Checklist……………………………………….…...…….....20

Technical Data…………………………………………...…………...…21

Specicaons………………………………………………..……...21

Dimensions…………………………………………………..……...23

Storage Tank Maintenance………………………..…….…..24

Replacement Parts…………………………………..……...…..25

Service/Maintenance Log…….…………..……………….....26

Warranty…………………………………………..………….….....28

TABLE OF CONTENTS

Demand Duo™ 80 3

Safety Behaviors and Pracces for the Consumer and Installer

CAUTION

• BURN HAZARD. Hot exhaust and vent may cause

serious burns. Keep away from the water heater

unit. Keep small children and animals away from

the unit.

• Hot water outlet pipes leaving the unit can be hot

to touch.

• Before operang, smell all around the appliance

area for gas. Be sure to smell next to the oor

because some gas is heavier than air and will sele

on the oor.

• Keep the area around the appliance clear and free

from combusble materials, gasoline, and other

ammable vapors and liquids.

• Combusble construcon refers to adjacent walls

and ceiling and should not be confused with

combusble or ammable products and materials.

Combusble and/or ammable products and

materials should never be stored in the vicinity of

this or any gas appliance.

• Always check the water temperature before

entering a shower or bath.

• To protect yourself from harm, before performing

maintenance:

 Turn o the electrical power supply by

unplugging the power cord or by turning o the

electricity at the circuit breaker. (The

temperature controller does not control the

electrical power.)

 Turn o the gas at the manual gas valve,

usually located immediately below the water

heater.

 Turn o the incoming water supply. This can

be done at the isolaon valve immediately

below the water heater or by turning o the

water supply to the building.

WARNING

• Use only your hand to push in or turn the gas

control knob. Never use tools. If the knob will not

push in or turn by hand, do not try to repair it; call a

licensed professional. Force or aempted repair

may result in a re or explosion.

• Do not use this appliance if any part has been under

water. Immediately call a licensed professional to

inspect the appliance and to replace any part of the

control system and any gas control which has been

under water.

• Do not use substute materials. Use only parts

cered for the appliance.

• Should overheang occur or the gas supply fail to

shut o, turn o the manual gas control valve to

the appliance.

• Do not adjust the DIP switch unless specically

instructed to do so.

• Do not use an extension cord or an adapter plug

with this appliance.

• Any alteraon to the appliance or its controls can

be dangerous and will void the warranty.

• Proper venng is required for the safe operaon of

this appliance.

California law requires this noce to be provided:

California Proposion 65:

This product contains chemicals known to the state of

California to cause cancer, birth defects, or other

reproducve harm.

WARNING

4 Demand Duo™ 80

A licensed professional must install the appliance,

inspect it, and leak test it before use. The warranty

will be voided due to any improper installaon.

The installer should have skills such as:

• Gas sizing.

• Connecng gas lines, water lines, valves, and

electricity.

• Knowledge of applicable naonal, state, and

local codes.

• Installing venng through a wall or roof.

• Training in installaon of Rinnai water heaters.

(Training can be accessed on-line at

www.trainingevents.rinnai.us)

Installaon Steps

Prepare for Installaon ...................................... 5

Determine Installaon Locaon ......................... 6

Venng Guidelines ............................................. 9

Installaon of Plumbing ................................... 11

Checklist for Plumbing ..................................... 14

Installaon of Gas Supply ................................. 15

Connect Electricity ........................................... 16

Checklist for Gas and Electricity ....................... 17

System Controller ............................................. 17

Condensate ...................................................... 18

Final Checklist................................................... 20

General Instrucons

Installer Qualicaons

DO NOT

• Do not install the Commercial Hybrid System

outdoors.

• Do not install the appliance in an area where water

leakage of the unit or connecons will result in

damage to the area adjacent to the appliance or to

lower oors of the structure. When such locaons

cannot be avoided, it is recommended that a

suitable drain pan, adequately drained, be installed

under the appliance. The pan must not restrict

combuson air ow.

• Do not obstruct the ow of combuson and

venlaon air. Combuson air shall not be

supplied from occupied spaces.

• Do not use this appliance in an applicaon such as

a pool or spa heater that uses chemically treated

water . (This appliance is suitable for lling large or

whirlpool spa tubs with potable water.)

• Do not use substute parts that are not authorized

for this appliance.

MUST DO

• The installaon must conform with local codes or,

in the absence of local codes, with the Naonal

Fuel Gas Code, ANSI Z223.1/NFPA 54, or the

Natural Gas and Propane Installaon Code, CSA

B149.1.

• The appliance, when installed, must be electrically

grounded in accordance with local codes or, in the

absence of local codes, with the Naonal Electrical

Code, ANSI/NFPA 70, or the Canadian Electrical

Code, CSA C22.1.

• The appliance and its appliance main gas valve

must be disconnected from the gas supply piping

system during any pressure tesng of that system

at test pressures in excess of 1/2 psi (3.5 kPa)

(13.84 in W.C.).

• The appliance must be isolated from the gas supply

piping system by closing its individual manual

shuto valve during any pressure tesng of the gas

supply piping system at test pressures equal to or

less than 1/2 psi (3.5 kPa) (13.84 in W.C.).

• You must follow the installaon instrucons and

those in Care and Maintenance for adequate

combuson air intake and exhaust.

Type of Installaon

• For installaon in commercial applicaons only.

INSTALLATION INSTRUCTIONS

(for the licensed professional)

Demand Duo™ 80 5

Prepare for Installaon

Parts included:

Tools needed:

Materials needed:

• Commercial Hybrid System

• Temperature and Pressure Relief Valve (Tank)

• Pressure Relief Valve (Pre-installed on Tankless)

• Pipe wrenches (2)

• Adjustable pliers

• Screwdrivers (2)

• Wire cuers

• Gloves

• Safety glasses

• Level

Tools that might be needed:

• Hammer drill with

concrete bits

• Saw

• Threading machine with

heads and oiler

• Core drill with diamond

head

• Torch set

• Copper tubing cuer

• Steel pipe cuer

Materials that may be needed:

• Soap or gas leak

detector soluon

• Approved venng

• Teon tape

(recommended) or pipe

compound

• Pipe insulaon

• Heat tape

• Electrical wire and

conduit per local code

• PVC glue/cement

• 5/8” ID PVC exible

tubing

• 2 conductor 22 AWG

wire for controller

• Single gang electrical

box

• Wire nuts

• Unions and drain valves

• Drain Pan

• Earthquake Strap

General Instrucons (Connued)

INFORMATION

• If a water heater is installed in a closed water

supply system, such as one having a backow

preventer in the cold water supply line, means

shall be provided to control thermal expansion.

Contact the water supplier or local plumbing

inspector on how to control thermal expansion.

• Should overheang occur or the gas supply fail to

shut o, turn o the manual gas control valve to

the appliance.

• Keep the air intake locaon free of chemicals, such

as chlorine or bleach, that produce fumes. These

fumes can damage components and reduce the life

of your appliance.

EARTHQUAKE STRAPPING

STRAP

Plasc Enclosure

(Side)

Plasc Enclosure

(Boom)

STRAP

NOTICE

Product installed in the state of California must be

braced, anchored, or otherwise secured to avoid moon

or falling during an earthquake. Contact the California

Oce of the State Architect located at 1102 Q Street,

Suite 5100, Sacramento, CA 95811 for instrucons.

1. Loosen screws along the perimeter of the plasc

enclosures

2. Remove plasc enclosures

3. Posion straps around the Demand Duo tank per

the requirements of California Oce of the State

Architect. DO NOT POSITION STRAPS OVER PIPE,

FITTINGS or WIRE.

4. Replace the plasc enclosures. (Modicaon of

the plasc enclosures may be necessary to t the

enclosures over the earthquake straps.)

5. Replace the screws around the perimeter of the

plasc enclosures.

6 Demand Duo™ 80

Determine Installaon Locaon

You must ensure that clearances will be met and that

the vent length will be within required limits. Consider

the installaon environment, water quality, and need

for freeze protecon. Requirements for the gas line,

water lines, electrical connecon, and condensate

disposal can be found in their respecve installaon

secons of this manual.

Minimum Clearances

The minimum clearances from both combusbles and

non-combusbles construcon is:

• 0 inches from the sides

• 0 inches from the back

• 12 inches from the top

• 6 inches from the front

• 0 inches from vent components and condensate

drain line.

*The clearance for servicing is 24 inches in front of the

water heater.

**The clearance for servicing the anode rods is

54 inches from the top of the water heater.

Checklist to Determine Installaon

Locaon

□ The water heater is not exposed to corrosive

compounds in the air.

□ The water heater locaon complies with the

clearances.

□ For indoor models, the planned venng will not

exceed the maximum length for the number of

elbows used.

□ The planned venng terminaon/air intake

locaon meets the clearances.

□ Indoor air is not being used for combuson.

□ The water supply does not contain chemicals or

exceed total hardness that will damage the heat

exchanger.

□ The installaon must conform with local codes or,

in the absence of local codes, with the Naonal

Fuel Gas Code, ANSI Z223.1/NFPA 54, or the

Natural Gas and Propane Installaon Code, CSA

B149.1.

□ Leave the enre manual taped to the water

heater, or give the enre manual directly to the

consumer.

• Choose the right hand truck to support the weight

and size of the water heater. Refer to the

“Specicaons” secon in this manual for specic

weights and dimensions.

• Use proper liing techniques to load the water

heater onto the hand truck:

• Posion the water heater onto the hand truck so

the weight is evenly balanced and the tank is

touching the rails of the hand truck.

• Secure the water heater to the hand truck:

 Posion STRAP A around the tankless unit as

illustrated below.

 Posion STRAP B around the base of the tank

below the LOWER ENCLOSURE.

Strap A

Strap B

Lower

Enclosure

Door

Demand Duo™ 80 7

REFER TO THE RL94 MANUAL FOR SPECIFIC DETAILS ON:

• Approved Vent Manufacturers and Terminaons

• Terminaon Clearances

• Maximum Vent Length

• Flue Installaon with Concentric Venng

• Consumer Operaon Guidelines for the Safe Operaon of your

Water Heater

• How to use the RL94 Temperature Controller

• RL94 Diagnosc Codes

• RL94 Required Maintenance (Draining of the tankless water heater will

require the lower enclosure to be removed. Reference page 17 to remove the enclosure.)

• RL94 Replacement Parts

8 Demand Duo™ 80

Installaon of Gas Supply

MUST DO

• A manual gas valve must be placed in the gas

supply line to the water heater. Install a union

between the gas valve and the appliance for future

servicing or unit removal.

• Check the type of gas and the gas inlet pressure

before connecng the water heater. If the water

heater is not of the gas type that the building is

supplied with, DO NOT connect the water heater.

Contact the dealer for the proper unit to match the

gas type.

• Check the gas supply pressure immediately

upstream at a locaon provided by the gas

company. Supplied gas pressure must be within

the limits shown in the Specicaons secon with

all gas appliances operang.

• Before placing the appliance in operaon all joints

including the heater must be checked for gas

ghtness by means of leak detector soluon, soap

and water, or an equivalent nonammable

soluon, as applicable. (Since some leak test

soluons, including soap and water, may cause

corrosion or stress cracking, the piping shall be

rinsed with water aer tesng, unless it has been

determined that the leak test soluon is non-

corrosive.)

• Use approved connectors to connect the unit to

the gas line. Purge the gas line of any debris before

connecon to the water heater.

• Any compound used on the threaded joint of the

gas piping shall be a type which resists the acon of

liqueed petroleum gas (propane/LPG).

• The gas supply line shall be gas ght, sized, and so

installed as to provide a supply of gas sucient to

meet the maximum demand of the heater and all

other gas consuming appliances at the locaon

without loss of pressure.

• Always check all gas pipe connecons and ngs

for leaks before operang the water heater. Use

soapy water on all ng and visually inspect for

bubble formaon. Rinse o soapy water and wipe

dry.

General Instrucons

WARNING

In order to access the gas connecons, remove the

plasc rivet screws that aach the lower enclosure to

the assembly. Proceed to then remove the lower

enclosure.

Gas Connecon

(3/4” MNPT)

Lower Enclosure

REFER TO THE RL94 MANUAL FOR

SPECIFIC DETAILS ON SIZING THE

GAS PIPE.

Gas

Valve

Union

1. If you are not knowledgeable or qualied to

install gas lines or connecons, then contact a

licensed professional to install the gas supply.

2. Turn o 120v power supply.

3. Turn o the gas.

4. Gas is ammable. Do not smoke or provide other

ignion sources while working with gas.

5. Do not turn on the water heater or gas unl all

fumes are gone.

Demand Duo™ 80 9

Connect Electricity

Do not rely on the gas or water piping to ground the

water heater. A terminal block inside the controller

should be used for the grounding connecon.

The water heater requires 120 VAC, 60 Hz power from

a properly grounded circuit.

The wiring diagram is located on the Technical Sheet

aached to the inside of the front cover.

WARNING

Do not use an extension cord or an adapter plug with

this appliance.

The water heang system must be electrically

grounded in accordance with local codes and

ordinances or, in the absence of local codes, in

accordance with the Naonal Electrical Code, ANSI/

NFPA No. 70.

The tankless water heater is equipped with a three-

prong (grounding) plug for your protecon against

shock hazard and should be plugged directly into the

three-prong receptacle located at the boom of the

controller.

REFER TO THE RL94 MANUAL FOR :

• High Altude Adjustment

• Vent Length Adjustment

• Temperature Controller Installaon

Low Voltage Ther-

mistors

Terminal

Block

Green

White

Black

Green

White

Black

DO NOT connect power to the commercial hybrid

system prior to compleng installaon and the

system has been lled with water.

ATTENTION

Green

White

Black

PRE-WIRED PUMP

CONNECTION

PRE-WIRED

SUPPLY POWER

Power Supply

Pump Control

Output: 120 Volt

Supply Power

Input: 120 Volt

(3 Prong Plug)

Tankless Supply

Output: 120 Volt

(3 Prong Receptacle

already connected to

tankless from factory)

Do not rely on the gas or water piping to ground the

water heater. A terminal block inside the controller

should be used for the grounding connecon.

The water heater requires 120 VAC, 60 Hz power from

a properly grounded circuit.

The wiring diagram is located on the Technical Sheet

aached to the inside of the front cover.

10 Demand Duo™ 80

SYSTEM CONTROLLER

NORMAL OPERATION (SLOW PULSE)

THERMISTOR ERROR (RAPID PULSE)

PUMP ON (SOLID GREEN LIGHT)

PUMP OFF (NO LIGHT)

Checklist for Gas and Electricity

□ A manual gas control valve is placed in the gas

line to the water heater.

□ Check the gas lines and connecons for leaks.

□ Conrm that the gas inlet pressure is within

limits.

□ Conrm that the water heater is rated for the gas

type supplied.

□ Conrm that the electricity is supplied from 120

VAC, 60 Hz power source and is in a properly

grounded circuit.

□ Conrm that an extension cord or an adapter plug

has NOT been used with the water heater.

The system controller maintains communicaon

between the tank and tankless to eecvely control

the tank temperature based on the selected

temperature on the tankless unit.

By reading the tank temperature (J22) and tankless

outlet temperature (J2), the System Controller will

energize (120V) the pump when the tank

temperature drops. When the tank temperature

returns to the selected set temperature the System

Controller will de-energize the pump and remain in

standby unl the tank temperature drops again.

When power is supplied, the System Controller will

maintain pump operaon. If system is not in use for

an extended period of me, Disconnect power from

the system.

ATTENTION

CONTROLLER DIAGNOSTICS

Demand Duo™ 80 11

Installaon of Plumbing

Pressure Relief Valve Requirements

An approved pressure relief valve (preinstalled) is

required by the American Naonal Standard (ANSI

Z21.10.3) for all water heang systems and shall be

accessible for servicing.

DO NOT

• Do not plug the relief valve and do not install any

reducing ngs or other restricons in the relief

line. The relief line should allow for complete

drainage of the valve and the line.

• Do not place any other type valve or shuto device

between the relief valve and the water heater.

MUST DO

• The relief valve must comply with the standard for

Relief Valves and Automac Gas Shuto Devices

for

Hot Water Supply Systems ANSI Z21.22 and /or the

standard Temperature, Pressure, Temperature and

Pressure Relief Valves and Vacuum Relief Valves,

CAN1-4.4.

• The pressure relief valve must be rated up to 150

psi and to at least the maximum BTU/hr of the

appliance.

• The discharge from the pressure relief valve should

be piped to the ground or into a drain system per

local codes.

• The pressure relief valve must be manually

operated once a year to check for correct

operaon.

• The relief valve should be added to the hot water

outlet line and near the hot water outlet according

to the manufacturer’s instrucons. DO NOT place

any other type valve or shut o device between

the relief valve and the water heater.

INFORMATION

If a relief valve discharges periodically, this may be due

to thermal expansion in a closed water supply system.

Contact the water supplier or local plumbing inspector

on how to correct this situaon. Do not plug the relief

valve.

Install the Temperature-Pressure Relief (T&P) Valve

according to these instrucons.

The tank poron of this system is provided with a

combinaon temperature-pressure relief valve. For

safe operaon of the water heater, the relief valve(s)

must not be removed from its designated point of

installaon or plugged.

An approved Temperature-Pressure Relief Valve is

required by the American Naonal Standard (ANSI

Z21.10.3) for all water heang systems, and shall be

accessible for servicing.

DO NOT

• Do not plug the T&P valve and do not install any

reducing ngs or other restricons in the relief

line. The relief line should allow for complete

drainage of the T&P valve and the line.

• Do not place any other type valve or shut o

device between the relief valve and the water

heater.

• Do not pipe temperature-pressure relief valve,

pressure relief valve, and/or condensate drain

together into a common pipe.

MUST DO

• The T&P valve must comply with the standard for

Relief Valves and Automac Gas Shuto Devices

for Hot Water Supply Systems ANSI Z21.22 and /or

the standard Temperature, Pressure, Temperature

and Pressure Relief Valves and Vacuum Relief

Valves, CAN1-4.4.

• The T&P valve must be rated up to 150 psi and to

at least the maximum BTU/hr of the appliance.

• The discharge from the T&P Valve should be

piped to the ground or into a drain system to

prevent exposure or possible burn hazards to

humans or other plant or animal life. Follow local

codes. Water discharged from the relief valve

could cause severe burns instantly, scalds, or

death.

• The Temperature-Pressure Relief Valve must be

manually operated once a year to check for

correct operaon.

Temperature-Pressure Relief Valve

Requirements

WARNING

Water discharged from the pressure relief valve

could cause severe burns instantly or death from

scalds.

12 Demand Duo™ 80

A Hot Water Outlet

B Hot Water Outlet Valve

C Temperature-Pressure Relief Valve

D Cold and Hot Unions

E Cold Water Supply Valve

F Cold Water Supply

G Thermal Expansion Tank

H Vent pipe (concentric shown for illus-

traon purposes, see venng secon

for other opons)

I Operaon Unit / Temperature Control

J Drain Pan

K Temperature-Pressure Relief Valve

Discharge Pipe (do not cap,

plug, or reduce )

L Drip Leg (Sediment Trap)

M Gas Union

N Gas Control Valve

O Thermostac Mixing Valve

P Non-Tempered Return Line

Q Non-Tempered Supply Line

Typical Installaons

* Field Supplied

Mixing Valve Installaon

Hot Water

Supply

Cold Water

Supply

Demand Duo™ 80 13

Piping Diagram for Basic Installaons

Commercial Hybrid

Single Unit Circulaon

Note:

Installaon must conform to applicable code

and all requirements listed in the installaon

manual. Balancing valves, equivalent piping,

pressure gauges, and temperature gauges are

to be used as necessary to ensure proper ow

between units.

Condensate piping shall be CPVC or PVC

material and shall not be smaller than the drain

connecon on the appliance.

Components of condensate drainage shall be

CPVC or PVC material. All components shall be

selected for the pressure and temperature

rang of the installaon.

Where the drain pipes from more than one unit

are manifolded together for condensate

drainage, the pipe or tubing shall be sized in

accordance with an approved method as

dictated by local codes.

Condensate must be disposed of according to

local codes.

Gas Supply

Cold Water Supply

Tankless PRV

Tank T&P

Pipe T&P to Open Drain Pipe Condensate to Open Drain

Hot Water Supply Line

Building

Circulaon

Pump

Building Hot Water

Return Line

(Oponal)

Condensate Drain Line

3in (75 mm)

minimum

14 Demand Duo™ 80

Piping Diagram for Mulple Unit Installaons

Notes:

• Installaon must conform to applicable code and all requirements listed in the installaon manual.

Balancing valves, equivale

nt piping, pressure

gages, and temperature gages are to be used as necessary to ensure proper ow between units.

• Condensate piping shall be CPVC or PVC material and shall not be smaller than the drain connecon on the appliance.

• Components of the condensate drainage shall be CPVC or PVC material. All components shall be selected for the pressure and te

mperature rang

of the installaon.

• Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be si

zed in accordance

with an approved method as dictated by local codes.

• Condensate must be disposed of according to local codes.

BUILDING CIRCULATION PUMP AND HOT

WATER RETURN LINE (OPTIONAL)

Addional units can be installed as illustrated.

PIPE EACH T&P AND PRV

TO OPEN DRAIN

Gas Supply

Cold Water Supply

Hot Water Supply Line

Demand Duo™ 80 15

Connect Water Heater to Water Supply

Water connecons to the Commercial Hybrid System

should follow all state and local plumbing codes.

If this is a standard installaon, refer to the Piping

Diagram for basic installaon.

1. Use of this layout should provide a trouble-free

installaon for the life of the water heater. Before

making the plumbing connecons, locate the

COLD water inlet and the HOT water outlet.

• The COLD water inlet is a 1.5” MNPT ng on

the lower poron of the tank below the

tankless unit.

• The HOT water outlet is a 1.5” MNPT ng

located at the top of the tank. Install a shut-

o valve close to the water heater in the cold

water line. It is recommended that unions be

installed in the cold and hot water lines so

that the water heater can be easily discon-

nected, if servicing is required.

2. When assembling the hot and cold piping, use a

good food grade pipe joint compound, and ensure

all ngs are ght. It is imperave that open

ame is not applied to the inlet and outlet ngs,

as heat will damage or destroy the plasc lined

ngs. This will result in premature failure of

the ngs, which is not covered by the

warranty.

□ Ensure that hot and cold water lines are not

crossed to the unit and are leak free.

□ Ensure that a pressure relief valve is installed with

a rang that exceeds the BTU input of the water

heater model. Refer to the rang plate on the

side of the water heater for BTU input.

□ Clean the inlet water lter by closing the cold and

hot water inlet isolaon (shut-o) valves. Put a

bucket under the lter at the boom of the water

heater to catch any water that is contained inside

the unit. Unscrew the water lter. Rinse the

lter to remove any debris. Install the lter and

open the isolaon valves.

□ Check for proper water pressure to the water

heater. Minimum water pressure is 50 psi. Rinnai

recommends 60-80 psi for maximum

performance.

□ Ensure any issues regarding water quality have

been properly addressed.

DO NOT OPERATE THIS WATER HEATER UNLESS IT IS

COMPLETELY FULL OF WATER. To prevent damage to

the water heater, all air must be relieved from the

system and a hot water xture must be owing water

before the water heater is plugged in and turned on.

To ensure safe and eecve operaon of the water

heater, use the following lling procedure. To ll the

water heater:

1. Ensure the drain valve located at the boom of

the tank is closed.

2. Open the nearest hot water xture in the

plumbing system.

3. Open the cold water supply valve to the water

heater.

4. Keep the hot water xture open unl the tank is

lled and constant ow is obtained at the xture.

5. Check water heater connecons and plumbing

system for damage or leaks. Repair if needed.

Filling the System

Checklist for Plumbing

NOTICE

DO NOT OPERATE THIS WATER HEATER UNLESS IT IS

COMPLETELY FULL OF WATER

16 Demand Duo™ 80

[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] Permied only if veranda, porch, deck, or balcony is fully open on a

minimum of two sides beneath the oor.

 For clearances not specied in ANSI Z223.1/NFPA 54, clearances are in

accordance with local installaon codes and the requirements of the gas

supplier.

Clearance to opposite wall is 24 inches (60 cm).

A vent terminaon must be installed to bring in combuson air and expel exhaust to the outside.

Ref Descripon Canadian Installaons US Installaons

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 Vercal clearance to venlated sot, located above the terminal within a * *

E Clearance to unvenlated sot * *

F Clearance to outside corner * *

G Clearance to inside corner * *

Clearance to each side of center line extended above meter/regulator

assembly

* *

I Clearance to service regulator vent outlet

Above a regulator within 3  (91cm)

horizontally of the vercal center line of

the regulator vent outlet to a maximum

vercal distance of 15  (4.5 m)

Clearance to nonmechanical air supply inlet to building or the combuson 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

Clearance above paved sidewalk or paved driveway located on public

property

7 feet (2.13 m)  *

M Clearance under veranda, porch, deck, or balcony 12 inches (30 cm)  *

Direct Vent Terminal Clearances

AIR SUPPLY INLET

VENT TERMINAL

AREA WHERE TERMINAL IS NOT PERMITTTED

SNOW

TERMINATION

Clearance in

Ref. A also

applies to

anticipated

snow line

Demand Duo™ 80 17

Venng Guidelines

DO NOT

• Do not use PVC/CPVC, ABS, or galvanized material

to vent this appliance.

• Do not cover non-metallic vent pipe and ngs

with thermal insulaon.

• Do not combine vent components from dierent

manufacturers.

• Vent diameter must not be reduced.

• Do not connect the venng system with an

exisng vent or chimney.

• Do not common vent the vent pipe of any other

manufacturer’s water heater or appliance.

MUST DO

• This water heater is a direct vent water heater and

therefore is cered and listed with the vent

system. You must use vent components that are

cered and listed with the water heater model.

• The vent system must vent directly to the outside

of the building and use outside air for combuson.

• Avoid dips or sags in horizontal vent runs by

installing supports per the vent manufacturer’s

instrucons.

• Support horizontal vent runs every four feet and

all vercal vent runs every six feet or in

accordance with local codes.

• Venng should be as direct as possible with a

minimum number of pipe ngs.

• Vent connecons must be rmly pressed together

so that the gaskets form an air ght seal.

• The vent piece connected to the water heater

must be secured with one self-tapping screw.

INFORMATION

• Refer to the instrucons of the vent system

manufacturer for component assembly

instrucons.

• If the vent system is to be enclosed, it is suggested

that the design of the enclosure shall permit

inspecon of the vent system. The design of such

enclosure shall be deemed acceptable by the

installer or the local inspector.

NOTICE

If it becomes necessary to access an enclosed vent

system for service or repairs, Rinnai is not

responsible for any costs or dicules in accessing

the vent system. The warranty does not cover

obtaining access to a vent system in an enclosed

environment.

18 Demand Duo™ 80

If the condensate collector is not used, the drain

pipe must be capped to prevent exhaust gases

and condensate from entering the building. The

cap is supplied on the appliance. In such an

instance slope the venng 1/4” per foot away

from appliance according to vent

manufacturer’s installaon instrucons.

Flue Installaon

Vercal Terminaon

(condensate collector must be used in all installaons)

3 in (75 mm)

minimum

3 in (75 mm)

minimum

Horizontal Terminaon using Condensate Collector

3 in (75 mm)

minimum

Condensate

To adjust the condensate collector posion or to

replace the female vent top with a male vent top:

1. Loosen the 4 screws at the rear bracket

2. Slide the bracket away from the female vent top.

3. Remove the 4 screws aaching the female vent top

to the water heater.

4. Li up the female vent top and reposion as desired

(or replace with a male vent top).

5. Install the 4 screws at the vent top and ghten the 4

screws at the bracket.

Secure the rst vent component to the water heater

with one self-tapping screw at the hole located above

the condensate collector.

Bracket

Condensate Collector

Securing Screw

Horizontal Terminaon without using the Condensate Collector

Maximum Height *

5 feet (1.52 m)

Regions of cold climate will create more

condensate in the vent system. The

condensate collector should be used in

cold climates.

If more than one elbow is used in the

vercal secon the condensate collector

must be used.

* The condensate collector must be used in

horizontal terminaons if a vercal rise in

the vent system exceeds 5.

WARNING

Install the venng terminaon according to the diagrams and instrucons below.

Slope the venting 1/4” per foot toward

the appliance according to the vent

manufacturers installation instructions.

Dispose of condensate per local codes.

Demand Duo™ 80 19

Condensate

Condensate can form in the vent of high eciency

direct vent appliances. Without proper drainage,

condensate will damage the heat exchanger.

To prevent condensate damage, follow these

instrucons.

DO NOT

• Do not allow condensate to enter the water

heater.

• Do not connect the condensate drain pipe directly

to the rain sewer.

• Do not connect the condensate drain line with an

air condioning evaporator coil drain or.

• Do not connect the condensate drain line to the

pressure relief valve/line of the appliance.

MUST DO

• Use only venng that is approved and idened as

acceptable for your parcular model.

• For vercal terminaons, install a condensate drain

and trap as close as possible to the appliance.

• Slope the venng 1/4” per foot toward the

appliance according to the vent manufacturers

installaon instrucons. Dispose of condensate per

local codes.

• All condensate must drain and be disposed of

according to local codes.

• If the condensate collector is not used, the drain

pipe must be capped to prevent exhaust gases and

condensate from entering the building. The cap is

supplied on the appliance. In such an instance

slope the venng 1/4” per foot away from

appliance according to vent manufacturer’s

installaon instrucons.

• Use only corrosion resistant materials for the

condensate drain lines such as PVC pipe or plasc

hose.

• The condensate drain pipe (along its enre length)

must be at least the same diameter as the drain

line, (5/8 inch NPT).

Checklist for Venng and

Condensate (indoor models only)

□ Verify proper clearances around the vent

terminaons and air intakes.

□ Ensure you have used the correct venng

products for the model installed and that you

have completely followed the venng

manufacturer’s installaon instrucons and these

installaon instrucons.

□ Verify that the vent pipe has a downward slope or

grade to the outside of 1/4 inch per foot (1.2° )

OR if the vent pipe is sloped toward the water

heater (as some local codes require), that a

condensate collector is installed to allow

condensaon to drain away from the water

heater to a proper drain source.

□ Verify that condensate will not be allowed to

drain back into the water heater.

□ Verify that the vent system does not exceed the

maximum length for the number of elbows used.

• The end of the condensate drain pipe should be

open to the atmosphere. The end should not be

under water or other substances.

• To minimize freezing of the condensate, run the

condensate drain line through an interior wall or

between insulaon and an interior wall.

• The condensate collector should be used for all

combinaon domesc/hydronic heang

applicaons.

INFORMATION

• A condensate trap is available, P/N 222053.

• Regions of cold climate will create more

condensate in the vent system. The condensate

collector should be used in cold climates.

• The condensate drain pipe should be as short as

possible and have a downward pitch.

20 Demand Duo™ 80

Final Checklist

□ The water heater is not subject to corrosive

compounds in the air.

□ The water supply does not contain chemicals or

exceed total hardness that will damage the heat

exchanger.

□ Clearances from the water heater unit are met.

□ Clearances from the vent terminaon / air intake

are met.

□ Ensure you have used the correct venng

products for the model installed and that you

have completely followed the venng

manufacturer’s installaon instrucons and these

installaon instrucons.

□ Verify that the vent system does not exceed the

maximum length for the number of elbows used.

□ Verify that SW 1 in DIPSW 1 has been adjusted for

vent length if necessary. Refer to the secon on

Maximum Vent Length.

□ Purge the water line of all debris and air by

closing the hot isolaon valve and opening the

cold isolaon valve and its drain. Debris will

damage the water heater. Use a bucket or hose

if necessary.

□ Ensure that hot and cold water lines are not

crossed to the unit and are leak free.

□ A manual gas control valve has been placed in the

gas line to the water heater.

□ Ensure that a pressure relief valve is installed with

a rang that exceeds the BTU input of the water

heater model. Refer to the rang plate on the

side of the water heater for BTU input.

□ Clean the inlet water lter by closing the cold and

hot water inlet isolaon (shut-o) valves. Put a

bucket under the lter at the boom of the water

heater to catch any water that is contained inside

the unit. Unscrew the water lter. Rinse the

lter to remove any debris. Install the lter and

open the isolaon valves.

□ Check the gas lines and connecons for leaks.

□ Conrm that the gas inlet pressure is within

limits.

□ Conrm that the water heater is rated for the gas

type supplied.

□ Conrm that the electricity is supplied from a 120

VAC, 60 Hz power source, is in a properly

grounded circuit, and turned on.

□ Verify the temperature controller is funconing

properly.

□ Verify that SW 2 and SW 3 in DIPSW 1 is set

correctly for your altude.

□ Verify the system is funconing correctly by

connecng your manometer to the gas pressure

test port on the water heater. Operate all gas

appliances in the home or facility at high re. The

inlet gas pressure at the water heater must not

drop below that listed on the rang plate.

□ DO NOT introduce toxic chemicals such as those

used for boiler water treatment to the potable

water used for space heang.

□ If the water heater is not needed for immediate

use, then drain the water from the heat

exchanger.

□ Install the front panel.

□ Explain to the customer the importance of not

blocking the vent terminaon or air intake.

□ Explain to the customer the operaon of the

water heater, safety guidelines, maintenance, and

warranty.

□ The installaon must conform with local codes or,

in the absence of local codes, with the Naonal

Fuel Gas Code, ANSI Z223.1/NFPA 54, or the

Natural Gas and Propane Installaon Code, CSA

B149.1.

□ Leave this manual and the enre RL94 manual

taped to the water heater, or give both manuals

directly to the consumer.

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Rinnai RHS19980HEXiN Installation guide

Brand: Rinnai

Model: RHS19980HEXiN

Category: Water heaters & boilers

Type: Installation guide

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