Rinnai REU-N3237FF-US-N Installation guide

REU-N3237FF-US-N
Rinnai
Brand
Rinnai
Model
REU-N3237FF-US-N
Category
Water heaters & boilers
Type
Installation guide
Place
Model/Serial #
Label Here
Located in Manual Bag
U334-0771X02(00)
INTERNAL INDOOR MODELS:
RUi REUNFFUS
RUi REUNFFUS
RUiREUNFFUS
RUi REUNFFUS
EXTERNAL OUTDOOR MODELS:
RUe REUNWUS
RUe REUNWUS
RUe REUNWUS
RUeREUNWUS
Tankless Water Heater (Residential)
Installation and Operation Manual
ANSI Z21.10.3 ● CSA 4.3
06000012336368
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.
– 
• 
or the gas 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
  .......................................................................................................... 50
  .................................................................................................... 51
  ................................................................................................. 52
4.9 Connect Condensate Drain .................................................................................................. 54
  ....................................................................................................... 57
  ................................................................................................... 60
  ............................................................................................. 61
  ............................................................................................. 63
4.14 Post-Water Heater Installation Checklist ............................................................................. 64
5. Operation ....................................................................................................................................... 66
  ................................................................................................................ 66
5.2 Operating Instructions ........................................................................................................... 68
5.3 Control Panel ........................................................................................................................69
Rinnai Tankless Water Heater Installation and Operation Manual 4
  .......................................................................................................70
  ................................................................................................................. 71
5.6 Diagnostic Codes .................................................................................................................. 73
6. Maintenance .................................................................................................................................. 76
6.1 Maintenance ......................................................................................................................... 76
  .................................................... 78
  ............................................................................................... 80
6.4 Draining the Water Heater .................................................................................................... 81
7. Appendices ................................................................................................................................... 82
7.1 Massachusetts State Gas Regulations ................................................................................. 82
  ..................................................................................................................... 84
  .................................................................................................................... 85
  ................................................................................ 86
  ............................................................... 87
8. Warranty ........................................................................................................................................ 88
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.
• 

• 


Acronyms and Abbreviations







To The Installer
• 

-


• 

– Gas sizing
– 

– 
and local codes
– 
– 
heaters. Training on Rinnai Tankless
Water Heaters is accessible at

• 
-


• 

• 



1. 1. WelcomeWelcome
Table 1
WARNING AVERTISSEMENT
Rinnai Tankless Water Heater Installation and Operation Manual 6
• -
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:
– 
– 

– 


– 

• 


• 


2. 2. SafetySafety
WARNING
WARNING
CAUTION
Rinnai Tankless Water Heater Installation and Operation Manual 7
2.2 Safety Precautions





-


• -



• Keep the area around the appliance clear



• -






• -

• -

– 




– -


– 



building.


and others.




DANGER










2.1 Safety Symbols
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 Inlet
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
Indoor Units Outdoor Units
RU199i RU180i RU160i RU130i RU199e RU180e RU160e RU130e
Minimum Gas
Consumption
Btu/h

Maximum Gas
Consumption
Btu/h
       
Flow Rate
1
(Min-Max)
0.26-9.8 GPM

0.26-9.0 GPM

0.26-8.0 GPM

0.26-6.6 GPM

0.26-9.8 GPM

0.26-9.0 GPM

0.26-8.0 GPM

0.26-6.6 GPM

Max Flow Rate
with Parameter
Adjustment
11 GPM

10 GPM

9 GPM

7 GPM

11 GPM

10 GPM

9 GPM

7 GPM

Weight 64 lb (29 kg) 62 lb (28 kg) 64 lb (29 kg) 62 lb (28 kg)
Sound Level 48 dB 47 dB 53 dB 52 dB
Electrical Data
Normal 84 W 65 W 52 W 38 W 81 W 62 W 49 W 36 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 Gas

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

Indoor Models

 
Outdoor 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

Figure 6: Supply Connections

Rinnai Tankless Water Heater Installation and Operation Manual 15
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.
3.6 Accessories




Table 4: Accessories
Rinnai Tankless Water Heater Installation and Operation Manual 16
Product Product Description Image

Part #: RWMGTK03




Part #: 105000250
-

EZConnect™ Cable
Part #: REU-EZC-2




Part #: REU-OPU3
-


handler applications.




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











Heaters is accessible online at

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
• 


• 


• 
-


-




• 

• 

• 

spas) in the appliance.
• 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






















SS
SS







4.3.2 Environment



















Regulation
Contaminant Maximum Level
Total Hardness 
 
Chlorides * 
Copper * 



Iron * 
Manganese * 
pH * 6.5 to 8.5

Solids) *

Zinc * 

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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Rinnai REU-N3237FF-US-N Installation guide

REU-N3237FF-US-N
Rinnai
Brand
Rinnai
Model
REU-N3237FF-US-N
Category
Water heaters & boilers
Type
Installation guide
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