Rinnai Demand Duo R Series User manual

CUS

2 Demand Duo™ R-Series (REC) Installation and Operation Manual
—Do not store or use gasoline or other flammable 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 instructions.
• If you cannot reach your gas supplier, call the fire department.
—Installation and service must be performed by a qualified installer, service
agency or the gas supplier.
IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY,
A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
READ ALL OF THE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING OR
OPERATING THIS WATER HEATER.
This manual provides information on the installation, operation, and maintenance of the water
heater. For proper operation and safety, it is important to follow the instructions and adhere to
the safety precautions.
A licensed professional must install the water heater according to the exact instructions in this
document.
The owner must read the entire manual to properly operate the water heater and understand
maintenance requirements.
This product is for indoor commercial applications only.
This product is NOT intended for residential applications.
WARNING
WARNING

Demand Duo™ R-Series (REC) Installation and Operation Manual 3
1. Welcome ......................................................................................................................................4
1.1 To the Installer .......................................................................................................................4
1.2 To the Owner .........................................................................................................................4
2. Safety...........................................................................................................................................5
2.1 Safety Symbols ......................................................................................................................5
2.2 Safety Precautions.................................................................................................................5
3. About the Water Heater ...............................................................................................................7
3.1 Components...........................................................................................................................7
3.2 Specifications.........................................................................................................................8
3.3 Dimensions ............................................................................................................................10
4. Installation....................................................................................................................................12
4.1 Installation Guidelines............................................................................................................12
4.2 What You Will Need...............................................................................................................13
4.3 Choose an Installation Location .............................................................................................13
5. Venting .........................................................................................................................................16
5.1 Venting Requirements............................................................................................................16
5.2 Combustion Air Requirements ...............................................................................................21
5.3 Venting Installation Checklist .................................................................................................24
6. Gas and Power Supply .................................................................................................................25
6.1 Connect the Gas Supply ........................................................................................................25
6.2 Gas Operating Instructions ....................................................................................................27
6.3 Gas Pipe Sizing Reference Tables ........................................................................................28
6.4 Connect Electricity .................................................................................................................29
6.5 Checklist for Gas and Electricity ............................................................................................30
7. Configure Parameter Settings.......................................................................................................31
7.1 Instructions.............................................................................................................................31
7.2 Service Indicator (Service Soon, SS)......................................................................................32
8. System Plumbing..........................................................................................................................33
8.1 PRV Requirements ................................................................................................................33
8.2 T&P Relief Requirements.......................................................................................................33
8.3 Typical Installations................................................................................................................34
8.4 Piping Diagram for Basic Installations....................................................................................35
8.5 Piping Diagram for Multiple Unit Installations.........................................................................36
8.6 Connect the Water Heater to the Water Supply .....................................................................37
8.7 Plumbing Checklist ................................................................................................................37
9. Post-Installation Checklist.............................................................................................................38
10. Operation....................................................................................................................................39
10.1 Safety Precautions...............................................................................................................39
10.2 Control Panel .......................................................................................................................40
10.3 Basic Operation Settings......................................................................................................41
11. Maintenance ...............................................................................................................................43
11.1 Performance Data ................................................................................................................46
11.2 Diagnostic Codes.................................................................................................................47
12. Warranty .....................................................................................................................................50

4 Demand Duo™ R-Series (REC) Installation and Operation Manual
• A trained and qualified professional must
install the system, inspect it, and leak test it
before use. The warranty may be voided due
to any improper installation.
• The trained and qualified professional should
have skills such as:
− Gas line sizing
− Connecting gas lines, water lines, valves,
and electricity
− Knowledge of applicable national, state,
and local codes
− Installing and routing B-Vent through a
roof
− Training in installation of water heaters.
Training on Rinnai Water Heaters is
accessible at
www.rinnaipro.myabsorb.com.
• Read all instructions in this manual before
installing the system. The system must be
installed according to the exact instructions in
this manual.
• Proper installation is the responsibility of the
installer.
• When installation is complete, leave this
manual with the system or give the manual
directly to the owner.
• You must read the entire manual to properly
operate the water heater and understand
maintenance requirements.
• Keep this manual for future reference.
• When using any appliance generating heat,
there are certain safety precautions you
should follow. See section “2.2 Safety
Precautions” for detailed safety precautions.
• Be sure your water heater is installed by a
trained and qualified professional.
For Your Records
Dealer Name:
Dealer Phone #:
Purchase Date:
Tank Serial #:
System Serial #:
Thank you for purchasing Rinnai’s Demand
Duo™ R-Series Commercial Automatic
Circulating Tank Water Heater. This manual
provides information on the installation, operation,
and maintenance of Rinnai’s Demand Duo™
R-Series Commercial Automatic Circulating Tank
Water Heater. Read this manual completely
before installing or operating the system.

Demand Duo™ R-Series (REC) Installation and Operation Manual 5
This is the safety alert symbol. This
symbol alerts you to potential hazards
that can kill or hurt you and others.
Indicates an imminently
hazardous situation which,
if not avoided, will result in personal injury or
death.
Indicates a potentially
hazardous situation
which, if not avoided, could result in minor or
moderate injury. It may also be used to alert
against unsafe practices.
DANGER
CAUTION
Indicates a potentially
hazardous situation
which, if not avoided, could result in personal
injury or death.
WARNING
WARNING
− Turn off the gas at the gas valve, usually
located immediately before the water heater.
− Turn off the incoming water supply. This can
be done at the isolation valve
immediately before the water heater or by
turning off the water supply to the building.
• 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
attempted repair may result in a fire 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 substitute materials. Use only parts
certified for the appliance.
• Should overheating occur or the gas supply fail
to shut off, turn off the manual gas control valve
to the appliance.
• DO NOT adjust the parameter settings unless
specifically instructed to do so. Only trained and
qualified professionals are permitted to adjust
parameter settings.
• DO NOT use an extension cord or an adapter
plug with this appliance.
• Any alteration to the appliance or its controls
may be dangerous and will void the warranty.
• Proper venting is required for the safe
operation of this appliance with 6 in. B-Vent or
greater. Refer to this manual or NFPA 54, and/or
CSA B149.1 for proper venting techniques for
fan-assisted Category 1 appliances.
• If a water heater is installed in a closed water
supply system, such as one having a
backflow 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.
• Keep the air intake location free of chemicals
such as chlorine or bleach that produce
fumes. These fumes can damage
components and reduce the life of your
appliance.
• Corrosive fumes, sometimes found in hair/ nail
salons, spas, or other industries exposed to toxic
fumes, may be released through these vents
when not in operation. Chemicals that are
corrosive in nature should not be stored or used
near the water heater or vent termination.
• You must follow the installation instructions and
those in section “11. Maintenance” for
adequate combustion air intake and exhaust.
• Make sure the water heater and its water lines
are protected from freezing. Damage due to
freezing is not covered by the warranty.
• Before operating, smell all around the
appliance area for gas. Be sure to smell next
to the floor because some gas is heavier than
air and will settle on the floor.
• Keep the area around the appliance clear and
free from combustible materials, gasoline, and
other flammable vapors and liquids.
• Combustible construction refers to adjacent
walls and ceiling and should not be confused
with combustible or flammable products and
materials. Combustible and/or flammable
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 off the electrical power supply by
unplugging the power cord or by turning off
the electricity at the circuit breaker. (The
“On/Off” button on the temperature control-
ler does not control the electrical power.)

6 Demand Duo™ R-Series (REC) Installation and Operation Manual
Hot water can be
dangerous, especially for
infants or children, the
elderly, or infirm.
There is hot water scald
potential if the thermostat
is set too high.
Water temperatures over
125ºF (51ºC) can cause
severe burns or scalding
resulting in death.
Hot water can cause first degree burns with
exposure for as little as:
3 seconds at 140ºF (60ºC)
20 seconds at 130ºF (54ºC)
8 minutes at 120ºF (48ºC)
Test the temperature of the water before placing
a child in the bath or shower.
DO NOT leave a child or an infirm person in the
bath unsupervised.
DANGER
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.
FLAMMABLE
Flammable Vapors
WARNING
FOR YOUR SAFETY
DO NOT store or use gasoline or other
flammable vapors and liquids in the vicinity of this
or any other appliance.
Install vent system per
local and national
codes.
Exposure to carbon
monoxide can cause
serious brain injury or
death. Read and follow
all instructions in this
section.
DO NOT install this water heater above 5,400
ft. (1,646 m).
DO NOT obstruct water heater air intake.
Failure to properly vent this appliance can
result in death, personal injury and/or property
damage.
Gas and carbon monoxide detectors are
available.
Every building should have a carbon monoxide
(CO) alarm in central areas. Check batteries
monthly and replace them annually.
DO NOT operate water heater if flood dam-
aged.
WARNING Carbon Monoxide
Hazard
• Install the vacuum relief valve per local
codes. Massachusetts 248 CMR Section
10.14 (I) “All potable water pressure tanks
shall be provided with a vacuum relief valve
at the top of the tank that will operate up to a
maximum water pressure of 200 P.S.I.G. and
to a maximum water temperature of 200°F
(93°C).”
Vacuum Relief Valve
(Not Supplied)
If required, install per local code and
valve manufacturers’ instructions.

Demand Duo™ R-Series (REC) Installation and Operation Manual 7
Pump
Electric
Conduit
Intake Filter Exhaust
Connector (IFEC)
(Supplied installed)
Dirt Leg
Gas Swivel
Gas Flex Line
Flare Nut
Adapter
Front Cover
The tankless engine is to be used
as a service part only for the
Demand Duo™ R-Series System.
RE is not permitted as a substitute.
REC is not permitted as tankless
only application.
IMPORTANT
Dirt Leg
Upper Tank
Thermistor
Lower Tank
Thermistor
Figure 1

8 Demand Duo™ R-Series (REC) Installation and Operation Manual
Table 1: Recovery capacies with respect to temperature for 80 gallon storage tank
RECOVERY CAPACITIES
Tank Capacity
U.S. GALLON/HR LITERS/HR AT TEMPERATURE RISE INDICATED
°F 30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
°C 17°C 22°C 28°C 33°C 39°C 44°C 50°C 56°C 61°C 67°C 72°C 78°C
CHS19980RECiN/
CHS19980RECiP
80 U.S.
Gals. GPH 643 482 386 322 276 241 214 193 175 161 148 138
303
Liters LPH 2,435 1,826 1,461 1,217 1,044 913 812 730 664 609 562 522
Product Number CHS19980RECiN CHS19980RECiP
Product Descripon Automac Circulang Tank Water Heater
Installaon Type Indoor
Minimum Gas Consumpon Btu/hr (kW/hr) 11,900 (3.5)
Maximum Gas Consumpon Btu/hr (kW/hr) 199,000 (58.3)
Tank Volume 80 Gallons (303 Liters)
First Hour Delivery at 100°F Rise 249 Gallons (942 Liters)
Temperature Seng 120°F (49°C) to 180°F (82°C)
Product Weight 331 lbs. (150 kg)
Noise level 54 dB
System Electrical
Data
Normal 236 W
Standby 1 W
Freeze Protecon
(Tankless) 226 W
Max Current 9.0 A
Fuse Tankless Engine - 10 A
Electric Connecons Appliance: AC 120 Volts, 60Hz.
Bypass Flow Control Bypass Servo Control
Gas Supply Pressure Natural Gas:
4.0 in. wc - 10.5 in. wc Propane: 8.0 in. wc - 13.5 in. wc
Connecons Gas Supply Inlet - 3/4 in. MNPT Hot Water Outlet - 1-1/2 in. MNPT
Cold Water Inlet - 1-1/2 in. MNPT
Ignion System Direct Electronic Ignion
Maximum Water Supply Pressure 150 PSI
Meets or exceeds energy eciency requirements of ASHRAE 90.1b (current standard), C.E.C. Listed 80%
Recovery Eciency.

Demand Duo™ R-Series (REC) Installation and Operation Manual 9
RECOVERY CAPACITIES
Tank Capacity
U.S. GALLON/HR LITERS/HR AT TEMPERATURE RISE INDICATED
°F 30°F 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
°C 17°C 22°C 28°C 33°C 39°C 44°C 50°C 56°C 61°C 67°C 72°C 78°C
CHS199100RECiN/
CHS199100RECiP
119
U.S.
Gals. GPH 643 482 386 322 276 241 214 193 175 161 148 138
450
Liters LPH 2,435 1,826 1,461 1,217 1,044 913 812 730 664 609 562 522
Table 2: Recovery capacies with respect to temperature for 119 gallon storage tank
Product Number CHS199100RECiN CHS199100RECiP
Product Description Automatic Circulating Tank Water Heater
Installation Type Indoor
Minimum Gas Consumption Btu/hr (kW/hr) 11,900 (3.5)
Maximum Gas Consumption Btu/hr (kW/hr) 199,000 (58.3)
Tank Volume 119 Gallons (450 Liters)
First Hour Delivery at 100°F Rise 276 Gallons (1046 Liters)
Temperature Setting 120°F (49°C) to 180°F (82°C)
Product Weight 364 lbs. (165kg)
Noise level 54 dB
System Electrical
Data
Normal 236 W
Standby 1 W
Freeze Protection (tankless) 226 W
Max Current 9.0 A
Fuse Tankless Engine - 10 A
Electric Connections Appliance: AC 120 Volts, 60Hz.
Bypass Flow Control Bypass Servo Control
Gas Supply Pressure Natural Gas:
4.0 in. wc - 10.5 in. wc
Propane:
8.0 in. wc - 13.5 in. wc
Connections
Gas Supply Inlet - 3/4 in. MNPT
Hot Water Outlet - 1-1/2 in. MNPT
Cold Water Inlet - 1-1/2 in. MNPT
Ignition System Direct Electronic Ignition
Maximum Water Supply Pressure 150 PSI
Meets or exceeds energy efficiency requirements of ASHRAE 90.1b (current standard), C.E.C. Listed 80% Recovery
Efficiency.

10 Demand Duo™ R-Series (REC) Installation and Operation Manual
Measurements in drawing
are shown in inches
[millimeters].
Models
CHS19980RECiN
CHS19980RECiP
SideFront
Figure 2
54.3
[1379]
23.8
[605]
4.2 [107]
3.5 [90]
61.9
[1572]
63.3
[1608]
65.25
[1657]
Top
27.7 [703]
ø 24.1 [612]
30°
17.3
[439]
8
[203]
27.2
[691]
35.6
[904]
Cold Inlet
Hot Outlet
Cold Inlet (Oponal)