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REU-N3237FFC-US-P

Rinnai REU-N3237FFC-US-P, REU-N2530FFC-US-N, REU-N2530FFC-US-P, REU-N2530WC-US-N, REU-N2530WC-US-P, REU-N3237FFC-US-N, REU-N3237WC-US-N, REU-N3237WC-US-P Operating instructions

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Place
Model/Serial #
Label Here
Located in Manual Bag
INTERNAL INDOOR MODELS:
CUi REUNFFCUS
CUiREUNFFCUS
EXTERNAL OUTDOOR MODELS:
CUe REUNWCUS
CUe REUNWCUS
Tankless Water Heater (Commercial)
Installation and Operation Manual
ANSI Z21.10.3 ● CSA 4.3
U334-0775X02(00)
06000012337594
Rinnai Tankless Water Heater Installation and Operation Manual 2
WARNING
If the information in these instructions is not followed exactly, a re or explosion may result
causing property damage, personal injury, or death.
• 
other appliance.
• WHAT TO DO IF YOU SMELL GAS
– 
– 
– -
tions.
– 
• 
supplier.
Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute
blessure ou la mort.
• -
ité de cet appareil ou de tout autre appareil.
• QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :
– 
– -

– 

– 
• -

AVERTISSEMENT
Full-length French and Spanish versions available online at rinnai.us
Rinnai Tankless Water Heater Installation and Operation Manual 3
Contents
1. Welcome ..........................................................................................................................................5
2. Safety ............................................................................................................................................... 6
  ....................................................................................................................... 7
  .................................................................................................................. 7
3. About the Water Heater .................................................................................................................. 9
  ............................................................................................................................... 9
  .......................................................................................................................... 10
  ......................................................................................................................... 11
  ........................................................................................................................ 12
  ........................................................................................................................... 13
3.6 Accessories .......................................................................................................................... 15
4. Install the Water Heater ................................................................................................................ 17
4.1 Installation Guidelines .......................................................................................................... 17
4.2 What You Will Need .............................................................................................................. 18
4.3 Choose an Installation Location ............................................................................................ 19
4.4 Mount the Water Heater to the Wall ...................................................................................... 24
4.5 Vent the Water Heater ..........................................................................................................26
  .......................................................................................................... 54
  .................................................................................................... 55
  ................................................................................................. 56
4.9 Connect Condensate Drain .................................................................................................. 58
  ....................................................................................................... 61
  ................................................................................................... 64
  ............................................................................................. 65
  ............................................................................................. 67
4.14 Post-Water Heater Installation Checklist ............................................................................. 68
5. Operation ....................................................................................................................................... 70
  ................................................................................................................ 70
5.2 Operating Instructions ........................................................................................................... 72
5.3 Control Panel ........................................................................................................................73
Rinnai Tankless Water Heater Installation and Operation Manual 4
  .......................................................................................................74
  ................................................................................................................. 75
5.6 Diagnostic Codes .................................................................................................................. 77
6. Maintenance .................................................................................................................................. 80
6.1 Maintenance ......................................................................................................................... 80
  .................................................... 82
  ............................................................................................... 84
6.4 Draining the Water Heater .................................................................................................... 85
7. Appendices ................................................................................................................................... 86
7.1 Massachusetts State Gas Regulations ................................................................................. 86
  ..................................................................................................................... 88
  .................................................................................................................... 89
  ................................................................................ 90
  ............................................................... 91
8. Warranty ........................................................................................................................................ 92
Rinnai Tankless Water Heater Installation and Operation Manual 5
ANSI 
Institute
BTU 
DHW 
GPM 
LP 
NG Natural Gas
PP 
PRV 
PSI 
W.C. 
To The Consumer
• -


• 
• 


-
tions.
• 
licensed installer.
• 


Acronyms and Abbreviations







To The Installer
• -



• 

– Gas sizing
– 

– 
and local codes
– 
– 
heaters. Training on Rinnai Tankless


• 
-


• 
the installer.
• 



1. 1. WelcomeWelcome
Table 1
WARNING AVERTISSEMENT
• -
tions données dans cette notice pour

-

• -
tions données dans cette notice pour

-

• 
-

autre appareil.
• QUE FAIRE SI VOUS SENTEZ UNE
ODEUR DE GAZ :
– 
– 


– -


– -

• 


de gaz.
• -

-

• 



• -


• WHAT TO DO IF YOU SMELL GAS:
– 
– 

– 


– 

• 


• 


Rinnai Tankless Water Heater Installation and Operation Manual 6
2. 2. SafetySafety
WARNING
CAUTION
WARNING


section.


The design is such that


• -



• Keep the area around the appliance clear



• -






• -

• -

– 




– -


– 



building.

potential hazards that can kill or hurt





DANGER

hazardous situation



also be used to alert


hazardous situation


death.
2.1 Safety Symbols 2.2 Safety Precautions
Rinnai Tankless Water Heater Installation and Operation Manual 7
Rinnai Tankless Water Heater Installation and Operation Manual 8
• 

-

• 



• 
heater can be hot to touch.
• -


(Ne pas entreposer ni utiliser d’essence ou
ni d’autres vapeurs ou liquides inamma-
bles à proximité de cet appareil ou de tout
autre appareil.)
• -
tional codes.
• 

• 

• 


• 
-



– 






• 






(N’utilisez pas cet appareil s’il a été plunge
dans l’eau, même partiellement. Faites
inspecter l’appareil par un licence pro-
fessionnelle et remplacez toute partie du
système de contrôle et toute commande
qui ont été plongés dans l’eau.)
• 

• -


(En cas de surchaue ou si l’alimentation
en gaz ne s’arrête pas, fermez manuelle-
ment le robinet d’arrêt de l’admission de
gaz.)
• 

• 

• -


• 

• -








gas appliance.
Rinnai Tankless Water Heater Installation and Operation Manual 9
3. 3. About the Water HeaterAbout the Water Heater
3.1 Front View
Indoor Outdoor
Figure 1: Front View
Topics in this section
• 
• 
• 
• 
• 
• Accessories
Controller
Piping Connections
Vent
Connections

Duct
Rinnai Tankless Water Heater Installation and Operation Manual 10
3.2 Bottom View
Gas
Hot Water
Outlet
Cold Water
Inlet


Figure 2: Bottom View
Rinnai Tankless Water Heater Installation and Operation Manual 11
3.3 Components
Air Intake

Ignition Unit

Control Panel




Air Inlet Filter

Venturi
Silencer


Intake

Figure 3: Components
Rinnai Tankless Water Heater Installation and Operation Manual 12
3.4 Specifications
Internal (Indoor) Units External (Outdoor) Units
CU199i CU160i CU199e CU160e
Minimum Gas
Consumption Btu/h

Maximum Gas
Consumption Btu/h
   
Flow Rate
1
(Min-Max)
0.26-9.8 GPM

0.26-8.0 GPM

0.26-9.8 GPM

0.26-8.0 GPM

Max Flow Rate
with Parameter
Adjustment
   
Weight 64 lb (29 kg) 62 lb (28 kg) 64 lb (29 kg) 62 lb (28 kg)
Sound Level 49 dB 48 dB 53 dB 52 dB
Electrical
Data
Normal 84 W 52 W 81 W 49 W
Standby 1.3 W
With Freeze
Protection
148 W 152 W
Max Current 
Fuse 
Temperature Setting


Bypass Flow Control Electronic
Gas
Supply
Pressure
2
Natural 
Propane 
Type of Appliance


Ignition System Direct Electronic Ignition
Electric Connections


Water Supply Pressure


Remote Control Cable 
ENERGY STAR®
Qualied
Yes
Complies with South
Coast Air Quality
Management District
14 ng/J or 20 ppm NOx
emission levels
Yes
1


2



Rinnai Tankless Water Heater Installation and Operation Manual 13
3.5 Dimensions

Internal (Indoor) Models

 


 
Vent Connection:


3 in./5 in. Concentric.
Figure 4: Indoor Dimensions
Figure 5: Outdoor Dimensions
Rinnai Tankless Water Heater Installation and Operation Manual 14
5.6. (142)
5.10 (129)
7.75 (197)
5.25 (133)
3.5 (89)
2.8 (71)
7.6 (193)
6.2 (157)
1.22 (31)
.36 (9)
Cold Inlet
Gas
Hot Outlet
Condensate
Drain
Pressure

Connection Connection Size
Gas 3/4 in. NPT
Cold Inlet 3/4 in. NPT
Hot Outlet 3/4 in. NPT
Condensate Drain 1/2 in. NPT
 M33 Thread
3.5.1 Supply Connections
Table 3
Figure 6: Supply Connections
Rinnai Tankless Water Heater Installation and Operation Manual 15
3.6 Accessories




Product Product Description Image

Part #: 108000105


Condensate Neutralizer
Part #: 804000074


ScaleCutter
Part #: 103000038




Cartridge
Part #: 103000039



Part #: 104000059
-


Additional Controller
Part #: MC-601-BK
MC-601-W
MC-195T-US



Part #: RGB-CTWH-4



Part #: PCD07-SM


Control-R™ Wi-Fi
Module
(And Accessories)
Part #: RWM101
-
-

The Control-R™ Wi-Fi Module and MC-


together.
Table 4: Accessories
Rinnai Tankless Water Heater Installation and Operation Manual 16
Product Product Description Image

Part #: RWMGTK03



Cascade Cable



-
ter heater.
EZConnect™ Cable
Part #: REU-EZC-2




Part #: REU-OPU3






Rinnai Tankless Water Heater Installation and Operation Manual 17
4. 4. Install the Water HeaterInstall the Water Heater
THIS SECTION IS INTENDED FOR THE
INSTALLER













4.1 Installation
Guidelines

guidelines:
• -



• 




• 



• 

• 









• 



• 

-

-


• -


(En cas de surchaue ou si l’alimentation
en gaz ne s’arrête pas, fermez manuelle-
ment le robinet d’arrêt de l’admission de
gaz.)
• 

-
-
ance.
Topics in this section
• Installation Guidelines
• 
• Choose Installation Location
• Mount Water Heater to the Wall
• Vent Water Heater
• 
• 
• 
• Connect Condensate Drain
• 
• 
• 
• 
• Post-Installation Checklist
Rinnai Tankless Water Heater Installation and Operation Manual 18
DO NOT
• 

CU160i.
• 

CU160e.
• 
-


-




• 

• 

• DO NOT use this appliance in an applica-
tion such as a pool or spa heater that uses



• DO NOT use substitute parts that are not

4.2 What You Will
Need
4.2.1 Items Included
Unpack the Rinnai Tankless Water Heater



Care at 1-800-621-9419.
• Rinnai Tankless Water Heater
• 

• 
• 
-
nance)
• Literature Bag
– Tankless Water Heater Installation and

– 

– 
printed QR code)
• 
connection)
• 





• 

4.2.2 Items Needed
(Field-Supplied)
• 
• 
• Wire Cutters
• 
• 
• 
• Soap or gas leak detector solution
• 
• 

• Pipe insulation
• 
• 
• 
• 
• Torch set
• Copper tubing cutter
• Steel pipe cutter
• Heat tape
• 
• 
• 
• 
• 
Rinnai Tankless Water Heater Installation and Operation Manual 19
4.3 Choose an
Installation
Location








4.3.1 Water Quality
Guidelines











the Rinnai Tankless Water Heater. Water that









SS
SS







4.3.2 Environment



















Regulation
Contaminant Maximum Level
Total Hardness 
 
Chlorides * 
Copper * 



Iron * 
Manganese * 
pH * 6.5 to 8.5

Solids) *

Zinc * 
Table 5
Rinnai Tankless Water Heater Installation and Operation Manual 20
4.3.3 Internal (Indoor) Water
Heaters
• 
-



-





• 
be installed so that it is sheltered/protected



• 
-

• 


-

• 
-



-





4.3.4 External Water Heaters
and Vent Terminations
• 


• 
be installed so that it is sheltered/protected



• 


• 
-



-





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