Rinnai Rice Cooker E50C Service Manual

Installation & Servicing

Instructions

High effi ciency condensing gas boiler

CAUTION!

Read this manual thoroughly before installing, servicing, putting
into operation or using this boiler and vent system.

WARNING!

Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
(exposure of hazardous materials)* or loss of life. Refer to the
user's information manual provided with this boiler. Installation
and service must be performed by a licensed professional, service
agency or the gas supplier (who must read and follow the supplied
instructions before installing, servicing, or removing this boiler).

CAUTION!

The user manual is part of the documentation that is delivered
to the installation's operator. Go through the information in this
manual with the owner/operator and make sure that they are
familiar with all necessary operating instructions.

Pictured: E50C

NOTICE!

Installation and service must be performed by a qualifi ed
installer, service technician or the gas supplier.

In the Commonwealth of Massachusetts this boiler must be
installed by a licensed Plumber or Gas Fitter.

WARNING!
If you do not follow these instructions exactly, a fi re or explosion
may result causing property damage, personal injury or loss of life.

- Do not store or use gasoline or other fl 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 instructions.

- If you cannot reach your gas supplier, call the fi re department.

Address: 103 International Drive, Peachtree City, GA, 30269

Toll-free: 1-800-621-9419 • Fax: [phone] • www.rinnai.us

8U.51.65.00 / 06.13 Changes reserved.

These instructions to be retained by user.

Contents of instructions

These installation instructions contain important information for the safe installation, start-up and maintenance of
boilers with capacities 50,000 BTU/hr.
These installation instructions are intended for licensed professionals, who have the necessary knowledge and
are approved for working on heating and gas systems.

Subject to technical changes

Changes may be made without notice to the illustrations, process steps and technical data as a result of our policy
of continuous improvement.

Updating of documentation

Please contact us if you have any suggestions for improvements or corrections.

Find our contact details on the back of this manual.

California Proposition 65 lists chemical substances known to the state to cause cancer, birth defects, death,

serious illness or other reproductive harm. This product may contain such substances, be their origin from fuel
combustion (gas, oil) or components of the product itself.

Rinnai combi boiler comply with the State of California Lead Law (AB1953).

Installation & Servicing Instructions Rinnai E-Series

2

Content

1 Safety and general instructions ........................................................4

1.1 Designated use ...................................................................4

1.2 Hazard defi nitions ................................................................4

1.3 Symbol defi nitions ...............................................................4

1.4 The following instructions must be followed ........................5

1.5 Follow these instructions for the space heating water .........6

1.6 Tools, materials and additional equipment ..........................6

1.7 Relevant Installation, Service and User manuals ................7

1.8 Disposal ...........................................................................7

2 Regulations and guidelines ..............................................................7

3 Description of the boiler ...................................................................8

4 Packaging and transportation ..........................................................9

4.1 Scope of delivery .................................................................9

4.2 Transportation .....................................................................9

5 Installation .........................................................................10

5.1 Requirements for the installation room .............................10

5.2 Fitting the boiler .................................................................11

5.3 Dimensions ........................................................................12

5.3.1 Clearances from boiler ......................................................13

5.4 Technical specifi cations .....................................................14

6 Connecting the boiler .....................................................................15

6.1 Central heating system ......................................................15

6.1.3 Safety valve .......................................................................20

6.1.4 Low water cut off ...............................................................20

6.2 Boiler expansion tank ........................................................20

6.3 Underfl oor heating system (plastic pipes) ...........................20

6.4 Gas supply connection ......................................................20

6.4.1 Gas connection with natural gas .......................................21

6.5 Hot water supply ................................................................22

6.5.1 Domestic Water quality ......................................................22

6.5.2 Domestic water treatment Accessory ...............................22

6.5.3 DHW Expansion Tank ........................................................23

6.5.3 Installing a Thermostatic Mixing Valve .............................23

6.5.4 Installing a valve kit ...........................................................24

6.5.5 Pressure relief Valve ..........................................................24

6.5.6 Programming domestic hot water preheat ........................24

6.6 Condensate drain pipe ......................................................25

6.7 Vent system and air supply system ...................................26

6.7.1 Intake / Exhaust Guidelines ...............................................26

6.7.2a Examples vent and air supply systems (parallel) ..............27

6.7.2b Examples vent and air supply systems (low profi le PP) ....28

6.7.3 Installation of the vent system ...........................................29

6.7.3.1 Conversion from parallel to concentric vent system ..........30

6.7.3.2 Installing air fi lter ...............................................................30

6.7.4 Vent/air intake terminal position ........................................31

6.7.5 Direct vent closet and alcove installation ........................33

6.7.6 Dimensioning of the exhaust and air intake duct .............34

6.7.7 Combustion air and vent piping lengths. ...........................35

6.7.8 Calculation of compensation factor ...................................36

6.7.9 Room Air System (indoor combustion air) .........................37

7 Electrical connections ....................................................................40

8 Boiler controls .........................................................................44

8.1 Explanation of the function buttons ...................................45

9 Starting up: Filling and de-aerating the boiler and installation .......46

9.1 Requirements of the water system ....................................46

9.2 Filling the heating system ..................................................47

9.3 Hot water supply ................................................................48

10 Adjustments .........................................................................50

10.1 Altering adjustments ..........................................................50

10.2 Activating factory settings (green button function) ...........53

11 Isolating the boiler .........................................................................53

12 Commissioning .........................................................................54

12.1 Testing for gas leaks ..........................................................55

12.2 Testing the Ignition Safety shut off device .........................55

12.3 Checking the O2.................................................................56

12.4 Measuring the ionization current .......................................57

12.5 Installing the casing ...........................................................57

13 Maintenance .........................................................................58

13.1 Periodic examination of venting systems and boiler .........58

13.2 Inspection .........................................................................58

13.2.1 Visual inspection for general signs of corrosion ................59

13.2.2 Measuring the ionization current .......................................59

13.2.3 Measuring the inlet gas pressure ......................................59

13.2.4 Testing for gas leaks ..........................................................59

13.2.5 Carrying out a pressure test of the heating system ...........59

13.2.6 Checking venting systems .................................................59

13.3 Maintenance activities .......................................................60

13.3.1 Reset service interval counter ...........................................63

13.4 Limited warranty ................................................................63

14 Parts of the boiler .........................................................................64

15 Blocks and Errors .........................................................................65

15.1 Error indication (short reference) .......................................65

15.2 Blocks .........................................................................66

15.3 Errors .........................................................................67

15.4 Other Errors .......................................................................71

16 Spare parts .........................................................................72

17 Parts list vent system .....................................................................80

18 Common venting guidelines ...........................................................82

Appendix A - Outoor Reset Sensor Data and

Resistance table NTC sensors .......................................83

Installation & Servicing Instructions Rinnai E-Series

3

1 Safety and general instructions

!

CAUTION

NOTICE

i

!

DANGER

!

WARNING

Please observe these instructions in the interest of your own safety.

1.1 Designated use

The boiler is designed for heating water for a central heating system and generating
domestic hot water. The boiler is delivered with a burner controller (MCBA) pre­installed.The boiler can be fi tted with a modulating outdoor reset sensor ARV12
(included with the boiler) or an On/Off thermostat or relay panel end switch
(accessories).

1.2 Hazard defi nitions

The following defi ned terms are used throughout the documentation to bring attention
to the presence of hazards of various risk levels. Notices give important information
concerning the operation of the product.

DANGER:

Indicates the presence of hazards that will cause severe personal injury, death or
substantial property damage.

WARNING:

Indicates the presence of hazards that can cause severe personal injury, death or
substantial property damage.

CAUTION:

Indicates presence of hazards that will or can cause minor personal injury or property
damage.

CAUTION

CAUTION:

Risk of electric shock. Indicates presence of hazards due to electric shock.

NOTICE:

Indicates special instructions on installation, operation or maintenance that are
important but not related to personal injury or property damage.

1.3 Symbol defi nitions

The following (safety) symbols may be encountered in these installation instructions
and on the unit:

This symbol indicates that the unit must be stored away from freezing conditions.

This symbol indicates that the packaging and/or contents can be damaged as
a result of insuffi cient care taken during transport.

This symbol indicates that, while still in its packaging, the unit must be protected
from weather conditions during transport and storage.

Installation & Servicing Instructions Rinnai E-Series

4

1.4 The following instructions must be followed

!

DANGER

!

WARNING

!

WARNING

!

WARNING

- The boiler must only be used for its designated purpose, as described in the
Installation Instructions.

- Each unit is fi tted with a data plate. Consult the details on this plate to verify whether
the boiler is compliant with its intended location, e.g.: gas type, power source and
venting classifi cation.

Only use the boiler with the accessories and spare parts listed.

-

- Other combinations, accessories and consumables may only be used if they are
specifi cally designed for the intended application and do not affect the system
performance and the safety requirements.

- Maintenance and repairs must be performed by licensed professionals.

- Installation of a condensing gas boiler must be reported to the relevant gas utility
company and have it approved.

- You are only allowed to operate the condensing gas boiler with the vent system
that has been specifi cally designed and approved for this type of boiler.

- Please note that local permission for the vent system and the condensate water
connection to the public sewer system may be required.

You must also respect:

- The local building codes stipulating the installation rules.

- The local building codes concerning the air intake and outlet systems and the
chimney connection.

- The regulations for the power supply connection.

- The technical rules established by the gas utility company concerning the
connection of the gas connection to the local gas mains.

- The instructions and standards concerning the safety equipment for the water/
space heating system.

- The Installation Instructions for building heating systems.

- The boiler must be located in an area where leakage of the boiler or connections
will not result in damage to the area adjacent to the boiler or to lower fl oors of
the structure. When such locations cannot be avoided, it is recommended that a
suitable drain pan be installed under the boiler.

- The boiler must be installed in such way that the all components are protected
from water (dripping, spraying, rain etc.) during boiler operation and service.

- The boiler must not be installed on or against carpeting.

- Do not restrict or seal any air intake or outlet openings.

- If you fi nd any defects, you must inform the owner of the system of the defect and
the associated hazard in writing.

In failure to properly commission the boiler as described in section 13 may result
unreliable burner operation, reduced component life, and unsafe boiler operation.

DANGER. Gas is fl ammable and may cause an explosion.
Beware if you smell gas: there may be an explosion hazard!

If the information in these instructions is not followed exactly, a fi re or explosion may
result causing property damage, personal injury or death.

- Do not store or use gasoline or other fl 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 instructions.

- If you cannot reach your gas supllier, call the fi re department.

Should overheating occur or the gas supply fail to shut off, do not turn off or
disconnect the electrical supply to the pump. Instead, shut off the gas supply
at a location external to the appliance.

Installation & Servicing Instructions Rinnai E-Series

5

Chemicals that are corrosive in nature should not be stored or used near the
boiler or vent termination.

i

NOTICE

1.5 Follow these instructions for the space heating water

Unsuitable heating system water can cause the formation of scale or sludge, which affects
system effi ciency. It can also cause corrosion and reduce life of the heat exchanger.
– You must follow Rinnai guidelines for boiler water quality.
– Thoroughly fl ush the system prior to fi lling.
– Follow the Rinnai cleaning instructions.
– Never use water that has been treated by a reverse osmosis, D.I., or distilled water

to soften the water to fi ll the heating system.

– Do not use inhibitors or other additives unless approved by Rinnai for that purpose.
– When freeze protection of the heating system is desired, only use Rinnai-approved

antifreezes. The allowed maximum concentration is 50%.

– When using oxygen-permeable pipes, e. g. for under fl oor heating systems, you

must separate the system from the boiler using plate heat exchangers.

–

Valve off boiler while fl ushing system, do not introduce any system cleaner into the
boiler loop. Flush system thoroughly to remove all system cleaner before fi lling boiler.

Approved antifreeze: • Rhomar RhoGard Mutli-Metal (AL safe) • Sentinel X500

(max. concentration 50%) • Noble Noburst AL • Fernox Alphi 11

Approved system cleaner: • Noble Noburst Hydronic System Cleaner • Fernox F3 Cleaner

• Rhomar Hydro-Solv 9100 • Sentinel X400

NOTICE

i

Approved inhibitors: • Rhomar Pro-tek 922 • Sentinel X100

• Noble Noburst AL inhibitor

NOTICE

i

The system cleaners from NoBurst, Rhomar, and Fernox are not to be used in
the boiler. The boiler must be closed off (valved off) from the rest of the system
or not connected while the cleaners are in the system. The system should then
be drained and then thoroughly fl ushed with clean water to remove all the
system cleaner.

See Chapter 6 and 9 of this manual for additional information.

If problems occur when using sanitary water with a chlorine content
higher than 150 mg/l, no recourse can be made to the terms of the limited
warranty.

1.6 Tools, materials and additional equipment

For the installation and maintenance of the boiler you will need:
– Standard tools for space heating, gas and water fi tting
– Digital manometer, capable of reading both positive and negative pressure
– Combustion analyzer (intended for use with condensing boilers)
– Digital multimeter
– pH digital meter
– Metric Allen wrenches
– Metric socket wrenches
In addition, a handtruck with a fastening belt is useful.

For maintenance of the boiler you will need, apart from standard tools for space
heating, gas and water fi ttings the following items:

- Boiler toolkit

Installation & Servicing Instructions Rinnai E-Series

6

1.7 Relevant Installation, Service and User manuals

NOTICE

i

– Approved vent system
– User manual

1.8 Disposal

– Dispose of the boiler packaging in an environmentally sound manner.
– Dispose of components of the heating system (e.g. boiler or control device), that

must be replaced in an environmentally responsible manner.

2 Regulations and guidelines

The installation must comply to the requirements of the authority having jurisdiction
or, in the absence of such requirements, to the latest edition of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54.

Where required by the authority having jurisdiction, the installation must comply to
the Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/
ASME CSD-1.

Install CO detectors per local regulations. Boiler requires an inspection every 2 years
and maintenance every 4 years or 8000 hours. See maintenance section chapter 13.

Operating Limits of the boiler:
Max. boiler temperature: 176 °F (80.0 °C)
Max. operating pressure: 45 psi (3 bar)
Max. Allowable Working Temperature ASME: 200 °F (93 °C)
Max. Allowable Working Pressure ASME: 45 psi (3 bar)

The hot water distribution system must comply with all applicable codes and
regulations. When replacing an existing boiler, it is important to check the condition
of the entire hot water distribution system to ensure safe operation.

For installations in the Commonwealth of Massachusetts, the following local
requirements apply in addition to all other applicable NFPA requirements:

For direct- vent boilers, mechanical-vent heating appliances or domestic hot water
equipment, where the bottom of the vent terminal and the intake is installed below
four feet above grade the following requirements must comply:

1)

If not present on each fl oor level where there are bedrooms, a carbon monoxide
detector and alarm must be placed in a living area outside the bedrooms. The
carbon monoxide detector and alarm must comply with NFPA 720 (2005 Edition).

2) A carbon monoxide detector and alarm shall be located in the room that houses
the appliance and/or equipment and shall:
a) Be powered by the same electrical circuit as the appliance and/or equipment

such that only one service switch services both the appliance and the carbon

monoxide detector;
b) Have battery back-up power;
c)

Meet ANSI/UL 2034 Standards and comply with NFPA 720 (2005 Edition); and

d) Have been approved and listed by a Nationally Recognized Testing Lab as

recognized under 527 CMR.

3) A product-approved vent terminal must be used, and if applicable, a product
approved air intake must be used. Installation shall be performed in strict compliance
with the manufacturer’s instructions. A copy of the installation instructions shall
remain with the appliance and/or equipment at the completion of the installation.

Installation & Servicing Instructions Rinnai E-Series

7

4) A metal or plastic identifi cation plate shall be mounted at the exterior of the building,
four feet directly above the location of vent terminal. The plate shall be of suffi cient

size to be easily read from a distance of eight feet away, and read “Gas Vent
Directly Below”.

For direct-vent boilers mechanical-vent heating boilers or domestic hot water
equipment where the bottom of the vent terminal and the intake is installed higher
than four feet above grade the following requirements must comply:

If not present on each fl oor level where there are bedrooms, a carbon monoxide

1)
detector and alarm must be placed in a living area outside the bedrooms. The
carbon monoxide detector and alarm must comply with NFPA 720 (2005 Edition).

2) A carbon monoxide detector shall:

a) Be located in the room where the boiler and/or equipment is located;
b) Be either hard-wired or battery powered or both; and:
c) Shall comply with NFPA 720 (2005 Edition).

3) A product-approved vent terminal must be used, and if applicable, a product­approved air intake must be used. Installation shall be in strict compliance with
the manufacturer’s instructions. A copy of the installation instructions shall remain
with the appliance and/or equipment at the completion of the installation.

3 Description of the boiler

Room sealed boiler

The boiler retreives its
combustion air from outside
then discharges the fl ue
gasses to the outside.

Condensing

Retrieves heat as much as
possible from the fl ue gasses.
Water condensates on the
heat exchanger.

Modulating

Stepless higher or lower
burning according to the heat
demand.

The Rinnai E50C boiler is a room sealed, condensing and modulating central heating
boiler, with an integrated DHW fascility.

The boiler is provided with a compact stainless steel heat exchanger with smooth
tubes. This design is a well engineered principle using durable materials.
The boiler burns gas for supplying heat. The heat is transferred in the heat exchanger
to the water in the central heating system. By cooling down the exhaust gases
condensate is formed. This results in high effi ciency. The condensate, which has
no effect on the heat exchanger and the function of the boiler, is drained through a
condensate collector trap.

The boiler is provided with an intelligent control system (CMS Control Management
System). The boiler anticipates the heat demand of the central heating system or the
domestic hot water facility system.

When an outdoor sensor is connected to the boiler it will operate weather dependantly
using outdoor reset. This means that the boiler control measures the outside
temperature and supply temperature. With this data the boiler calculates the optimal
supply temperature for the installation.

Explanation of the appliance type: Rinnai E50C
E = Type
50 = Nominal load in (x1000) BTU
C = C = Combi

Different boilertypes:

Combi boiler with integrated DHW facility
E50C

Installation & Servicing Instructions Rinnai E-Series

8

4 Packaging and transportation

!

CAUTION

t

4.1 Scope of delivery

The boiler is supplied ready for use.

• Please check if the packaging is intact.

• Check if all the items listed are included in the delivery.

The supply kit contents:

Part No. Description Amoun

Install Parts Bag E50C:

Boiler with:

ARV1215U Outdoor reset sensor ARV12 1
44215900 Compression ring Ø22 brass 4
44237500 Compression ring Ø15 brass 4
44357010 Screw 4,8X16mm 4
44380900 Line voltage input connector 3 pole grey 1
44457400 Nut W1.1/8x1/14 22 Compression fitting 2
44527600 Cap de-aerator 1
44748300 Flow restriction MR01 FG 7,6L white 1
44765910 Adapter fitting 15mm x 3/4"NPT ext. 2
44786700 Water lock 1/2"NPT x 1/4"NPT 1
44786800 T/P Gauge 1/4"NPT 1
44786900 Safety valve 3/4"NPT 1
44840100 Adapter fitting 22mm x 1"NPT ext. 2
71035700 Nut 15mm compression fitting 2

E50C

804000088

44839200

8U51650x Installation & Service Instructions 1
8U52650x User information manual 1
8U304000 Warranty document 1
8U300600 ICSL book 1

4.2 Transportation

The boiler may be damaged when not secured properly.

- Only transport the boiler using appropriate transportation equipment, such as a
handtruck with a fastening belt or special equipment for maneuvering steps.

- When shipping the boiler must be secured on the transportation equipment to
prevent it from falling off.

- Protect all parts against impacts if they are to be transported.

- Follow the transportation markings on the packaging.

• Packaged boilers must always be lifted and carried by two people, or you must

use a handtruck or special equipment for transport.

Wall mounting suspension bracket 1

Installation & Servicing Instructions Rinnai E-Series

9

5 Installation

y

5.1 Requirements for the installation room

DANGER

!

- The room where the boiler will be placed must always be free from freezing
conditions.

- Do not store or use gasoline or other fl ammable vapors and liquids in the
vicinity of this or any other appliance.

- Never use or store any chlorinated detergents or halogenated hydrocarbons
(e.g. in spraycans, solvents and detergents, paints, adhesives) in proximity
of the boiler.

- The boiler must be installed in such a way that it is protected from water
(dripping, spraying, rain, etc.) during boiler operation and service (circulator
replacement, condensate trap, control replacement, etc.)

- This boiler is for intended for indoor installations only.

Products to avoid present in boiler room
and/or around combustion air intake

Spray cans containing chloro-/fluorcarbons
Ammonium and/or ammonium solutions
Permanent wave solutions (hair product)
Chlorinated waxes and/or cleaners
Swimming pool chemicals based on chlorine
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents
found in household laundry rooms

Adhesives used to fasten building products and
other similar products

Areas likel

Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops

to have contaminants

Installation & Servicing Instructions Rinnai E-Series

10

5.2 Fitting the boiler

!

CAUTION

NOTICE

i

NOTICE

i

!

WARNING

- Remove the packaging materials.

- Lay the boiler on its back during unpacking. Remove the casing from the
boiler. This part can be left apart during installation. It must be placed on the
boiler and fi xed with the screw behind the door and in the 4 quick releases
before the boiler is started up.

Turn the boiler to its side and remove the wall bracket from the back of the
boiler by removing the 2 screws.

The boiler can be mounted practically to any wall with the suspension bracket and the
enclosed mounting equipment.

- The wall must be fl at and of suffi cient strength in order to be able to securely hold
and support the boiler weight with its water content.

- Take note of the necessary space around the boiler for installation of venting
system, pipework and servicing. See drawing on pages 12 to 15.

- Drill the necessary holes using the template

- Install the mounting bracket to the wall

Lifting and carrying precautions:
To avoid personal injury please follow these recommendations:

- Always lift the boiler with 2 people or use special equipment.

- When lifting the boiler, bend the knees, and keep the back straight and feet
apart.

- Do not lift and twist at the same time.

- Lift and carry the boiler close to the body.

- Wear protective clothing and gloves to protect from any sharp edges.

Lift the boiler only by the boiler's rear wall. Do not lift using the pipes on the
bottom of the boiler or the vent connections on the top of the boiler.

- Dispose the packaging materials.

Installation & Servicing Instructions Rinnai E-Series

11

yp

5.3 Dimensions

C

F

D

Connection for combustion

air supply and vent system

E

V

A

P

f w g k r c

Q R

S

T

H

O

G

N

J

K

B

dimensions figure 1

Combi

Dimensions Connection diameter

Boiler t

A Height 25.6" / 650
B Width 19.7" / 500
C Depth 15.6" / 395
D Left side / vent 13.2" / 335
E Center to center / vent and air supply 4.7" / 120
F Back / vent 10.6" / 270
G Left side / gas pipe 9.8" / 250 g 3/4"M-NPT
H Left side / supply pipe 5.9" / 150 f 0.59" x 1"M-NPT / 22mm
J Left side / return pipe 13.8" / 350 r 0.59" x 1"M-NPT / 22mm
K Left side / condensate pipe 15.9" / 405 c 0.87" / 22mm
N Left side / cold water pipe 11.2" / 285 k 0.59" x 3/4"M-NPT / 15mm
O Left side / hot water pipe 8.5" / 215 w 0.59" x 3/4"M-NPT / 15mm
P Pipe length of g 8.5" / 215
Q Pipe length of c 1.6" / 40
R Pipe length of k and w 6.3" / 160
S Back / Center of pipe c, k and w 1" / 26
T Back / Center of pipe f, g and r* 2" / 50

e

E50C E50C

inches / mm inches / mm

V Pipe length vent parallel 7" / 177 x 3" / 80mm

dimensions table 1

Installation & Servicing Instructions Rinnai E-Series

12

5.3.1 Clearances from boiler

A

ceiling

Min. 10" /

250mm

15.7"
400

wall

24"
600

2"
50

2"
50

service clearances to the boiler figure 4

Minimum required clearances

to combustibles

All types All types

inch / mm inch / mm inch / mm
Top of boiler 0" 0" 10" / 250
Back of boiler 0" 0" 0"
Front of boiler 1" / 25 1" / 25 24" / 600
Left side of boiler 0" 0" 2" / 50
Right side of boiler 0" 0" 2" / 50

Floor / Ground to
bottom of boiler

Vent 0" 0" 0"

clearances to the boiler table 3

0" 0"

Minimum required clearances

to non-combustibles

Required

service clearances

ll types

10" / 250
30" / 762

is recommended

For closet installation: clearance is 1” / 25mm from the front.

Installation & Servicing Instructions Rinnai E-Series

13

5.4 Technical specifi cations

(

)

(

)

E-Series

Combi

Boiler type E50C

Input Hs CH BTU/hr 50,000

kW 14.7

Output non-condensing CH

Q

n

Output EN677 efficiency CH

Q

n

Q

Output AFUE CH

n

Efficiency at 98.6/86°F (36/30°C) part load,
Hs, EN677 CH
AFUE according IBR

(at full load)

O

2

Electr. power consumption max. W 145
Electr. power consumption stand by W 14
Current V/Hz 120Vac/60Hz
Fuse rating A 5AF & 4AT
Degree of protection acc. EN 60529
Weight (empty)
Water content CH
Water content DHW
After run time pump CH min 5
After run time pump DHW min 1

Water pressure min.-max.

P

MS

Water pressure DHW max.

P

MW

Flow temperature max.
Pump type UPS20-48
Available pump height CH PSI / kPa 3.8 / 26
Approvals ASME, CSA

DHW flow
DHW flow

at 'T75°F
at 'T41.7°C

Max. DHW flow rate

DHW temperature (T

=50°F (10°C)

in

Pressure difference DHW PSI / bar 2.9 / 0.2

BTU/hr 45,000
kW 13.2
BTU/hr 49,400
kW 14.5
BTU/hr 47,800
kW 14.0

%98.8

%

95.6

% Natural gas: 4.4 - 4.7 (Propane: 4.8 - 5.1)

IPX4D (IPX0D in case of room air)
lbs / kg
gallon / liter
gallon / liter

91 / 39

0.9 / 3.5

0.13 / 0.5

PSI / bar 14 - 43 / 1 - 3

PSI / bar 150 / 10
°F / °C

gallon/min
liter/min

176 / 80

2.1

7.9
gallon/min 2.1
liter/min 7.9

°F / °C 140 / 60

CSA number 2183087
CRN number 8101.7CL

Technical specifications Table 4

Installation & Servicing Instructions Rinnai E-Series

14

6 Connecting the boiler

NOTICE

i

The boiler has the following connection pipes;

- The central heating circuit pipes.

These must connected to the system by means of 1" (22mm) adapter fi ttings.

See further chapter 6.1;

- The gas supply pipe.

It is provided with a 3/4" male thread into which the tail piece of the gas valve can

be screwed. See further chapter 6.4;

- Cold and hot water pipes for domestic hot water (DHW).
These consist of 3/4" (15 mm) copper pipe and can be connected to the installation

by means of 3/4" M-NPT adapter fi ttings. See further chapter 6.5;

- The condensation drain pipe.

It consists of an oval 1" (22 mm) plastic pipe. The drain pipe can be connected to

this by means of an open connection. If the open connection is fi tted in a different
location, then the pipe can be lengthened by means of a 1 1/4" (32 mm) PVC
sleeve. See further chapter 6.6;

- The vent system and air supply system.

It consists of a twin pipe connection that will accept 80mm fl ue and intake air or with
the use of the included adapters 3” PVC/CPVC fl ue and intake. See further chapter

6.7.

The pipes to be connected to the boiler must be cleaned before connecting in
order to prevent dirt from entering and damaging the boiler.

Installation & Servicing Instructions Rinnai E-Series

15

T

6.1 Central heating system

NOTICE

i

NOTICE

i

NOTICE

i

NOTICE

i

Connect the central heating system according to its instructions.

The boiler pipes can be connected to the installation by means of compression fi ttings.
Reducers should be used for connecting to thick-walled pipe (welded or threaded).

When removing the plastic sealing caps from the pipes, dirty testing water may
drain from the boiler.

The boiler, when used in connection with a refrigeration system, must be
installed so the chilled medium is piped in parallel with the boiler with appropriate
valves to prevent the chilled medium from entering the boiler.

The boiler piping system of a hot water boiler connected to heating coils located
in air handling units where they may be exposed to refrigerated air circulation
must be equipped with fl ow control valves or other automatic means to prevent
gravity circulation of the boiler water during the cooling cycle.

Some installations with multiple zone valves may require a differential bypass,
this will prevent excessively high fl ow rates through a single zone when the
other zone valves are closed.

Optional LWCO

hermostat

Air

Separator

P

T

Bypass for system

ushing only

Dirt
Trap

Pressure

gauge

P

Manual Fill

Valve

Automatic Fill

Valve

Purge Station

Back ow
preventer

Ball valve

5

Boiler basic piping fi g. 5

Installation & Servicing Instructions Rinnai E-Series

16

- Boiler system fl ushing (Not Boiler heat exchanger)

When replacing an existing boiler the heating system should be fl ushed with
the old boiler in place before the new boiler is added to the system. If the old
boiler has already been removed a bypass must be piped in when the new boiler
is installed in order to facilitate the fl ushing of the system.
The boiler must be valved off from the system, while the system is fl ushed. No
system cleaner should ever enter the boiler heat exchanger due to its caustic
nature which could damage the heat exchanger.

1. Close the shutoff valves on both the supply and return connections on the plumbing
kit (V1 and V2).

2. Open the bypass valve (V4).

3. Connect pump outlet hose (H1) to the purge station (BD1) and connect H2 to the
inlet of the pump and place the other end in the pail.

4. Connect drain hose (H3) to the return side purge station (BD2).

5. Pour the system cleaner into a pail and follow the system cleaner instructions on
circulation time and volume to be added to the system.

6. Close the valve (V3)

7. Operate the pump (P1) and circulate the cleaner through the system for required
time as established by the cleaner manufacturer.

8. Once the time required by the system cleaner manufacturer has been met place
the hose (H3) in a drain.

9. Close the purge station (BD1)

10. Open the auto feed on the system (F1) and allow water to rinse the system for
whichever is greater; 10 minutes or the required rinse time by the system cleaner
manufacturer.

P

T

V1 V2

BD1 BD2

V4

P

F1

Boiler system fl ushing fi g. 7

V3

H1

H3

CP

H2

System cleaner

Installation & Servicing Instructions Rinnai E-Series

17

11. If the installation is a zone system be sure to purge out each zone individually

NOTICE

i

12. Close the auto feed on the system (F1)

13. Close the return side purge station (BD2) and disconnect the hose (H3).

14. Open the main valve on the system return (V3)

15. Close the bypass valve below the plumbing kit (V4).

16. Open shutoff valves on both the supply and return connections on the plumbing
kit (V1 and V2).

17. Clean out the dirt trap

18. Test the pH of the water that will be used for fi lling the system

19. Test the water hardness of the water that will be used for fi lling the system

20. Use the proper water treatment to ensure the pH and water hardness are within
the Rinnai boiler water quality guidelines

21. The boiler and system may now be fi lled.

The following is a list of approved system cleaners, inhibitors, and antifreeze.

Approved antifreeze:

• Rhomar RhoGard Mutli-Metal (AL safe) • Sentinel X500

• Noble Noburst AL • Fernox Alphi 11

Approved system cleaner:

• Noble Noburst Hydronic System Cleaner • Fernox F3 Cleaner

• Rhomar Hydro-Solv 9100 • Sentinel X400

The system cleaners from NoBurst, Rhomar, and Fernox are NOT to be used in
the boiler. The boiler must be closed off (valved off) from the rest of the system
or not connected while the cleaners are in the system. The system should then
be drained and then thoroughly fl ushed with clean water to remove all the
system cleaner.

Approved inhibitors:

• Rhomar Pro-tek 922 • Sentinel X100

• Noble Noburst AL inhibitor

- Connect the expansion tank to the system. See chapter 6.2.

- Connect the pipes so that they are free from strain.

Installation & Servicing Instructions Rinnai E-Series

18

NOTICE

i

Water fi lter fi gure 8

The boiler has a self-adjusting and self-protecting control system for the load and the
pump capacity. By this means, the temperature difference between the supply and return
water is checked and controlled.

If the installation resistance is over the stated value; the load will be adjusted until
an acceptable temperature difference between supply and return water has been
obtained. If, after this, the temperature difference is still not acceptable then the boiler
will switch off and wait until an acceptable temperature has arisen.
If an unacceptable temperature is detected, the control will repeatedly try to achieve
water fl ow over the boiler. If not the boiler will switch off.

As standard the boiler is provided with a water fi lter in the return pipe of the boiler,
so that debris from the central heating water is prevented from affecting the boiler.

The boiler is designed to be used on pressurized heating systems only (closed
loop).

The maximum available head pressure from the boiler pump for the system is
2 psi = 4.6 feet of head.

If the boiler is to be installed in a system that utilizes zone pumps and not zone valves
a low loss header plumbing kit should also be installed (part number: 804000061).

If the pressure drop in the loop/system is greater than the available head pressure
from the boiler pump a low loss header plumbing kit should be used (part number:

804000061).

Installation & Servicing Instructions Rinnai E-Series

19

6.1.3 Safety valve

NOTICE

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!

DANGER

!

DANGER

!

WARNING

i

i

i

NOTICE

An ASME 30 psi pressure relief valve is included with the boiler and must be
fi tted before any shut off valve in the system.

6.1.4 Low water cut off

The Rinnai E50C boiler has a factory installed pressure switch type Low Water

NOTICE

Cut Off (LWCO). Check your local codes to see if a Low W ater Cut Off is required
(LWCO) and if this device conforms to local code.

The Low water cut off is not serviceable.

6.2 Boiler expansion tank

Choose an expansion tank volume, of which is geared to the installation’s water
capacity. The pre-charge pressure depends on the installation height above the
expansion tank. Fit the expansion tank into the return pipe as close as possible to
the boiler return connection. The expansion tank should be sourced locally. Please
refer to the expansion tank manufacturer for further information.

NOTICE

Fill the expansion tank to a minimum of 14.5 psi.

i

NOTICE

The boiler cannot be used with an open type expansion tank.

6.3 Underfl oor heating system (plastic pipes)

When using oxygen-permeable pipes, e. g. for underfl oor heating systems, the system
must be separated using plate heat exchangers.

No recourse can be made to the terms of the limited warranty in the event of
failure to observe the regulations pertaining to plastic underfl oor heating pipes.

6.4 Gas supply connection

Only work on gas lines if you are licensed for such work.
If these instructions are not followed exactly, a fi re or explosion may result
causing property damage, personal injury or death.

Rinnai wall mounted E boilers are built to run on Natural Gas. The gas type the
boiler is suitable for is indicated on the packaging and on the boiler by a blue
label with Natural Gas and on the identifi cation plate on the boiler.
First check the identifi cation plate on the boiler for the suitable gas type.

20

Do not use the boiler for another type of gas than indicated on the identifi cation
plate of the boiler. This will cause improper functioning and can damage the
boiler.

Natural gas: resume with chapter 6.4.1
When propane gas is desired, the boiler can be converted to propane gas by means
of a conversion kit. Rinnai Part number:803000014.

Installation & Servicing Instructions Rinnai E-Series

6.4.1 Gas connection with natural gas

NOTICE

i

NOTICE

i

!

DANGER

NOTICE

i

NOTICE

i

Sediment trap fi gure 10

The gas supply connection must comply with local regulations or, if such
regulations do not exist, with the National Fuel Gas Code, ANSI Z 223.1.

Pipe sizing for natural gas

Contact gas supplier to size the gas supply line and meter.

Gas piping

A sediment trap must be installed upstream of the gas controls.

The boiler gas pipe is equipped with external 3/4" M-NPT thread, onto which the tail
piece of the gas shut off valve can be connected. Use appropriate sealing.

The connection to the boiler must include a suitable method of disconnection and a gas
control valve must be installed adjacent to the boiler for isolation purposes. The nominal
inlet gas pressure measured at the boiler should be 7" W.C. (18 mbar) for Natural gas
(Gas A). Maximum pressure with no fl ow (lockup) or with the boiler running is 10.5
inches W.C. Minimum pressure with the gas fl owing (verify during boiler startup) is

3.0 inches W.C.

The gas pipe must be fi tted to the gas valve free from any strain.

Make sure that the gas pipe system does not contain dirt, particularly with new
pipes.

Always check the safety of the gas pipe system by means of a bubble test using
leak-search spray.

The boiler and its individual shut off valve must be disconnected from the
gas supply piping system during any pressure testing of that system at test
pressures in excess of 1/2 PSI (3.5kPa).

The boiler must be isolated from the gas supply piping system by closing its
individual manual shutoff valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than 1/2 PSI (3.5 kPa).

Installation & Servicing Instructions Rinnai E-Series

21

6.5 Hot water supply

NOTICE

i

NOTICE

i

Connection of the drinking water installation should be performed according to the
national secondary drinking water regulations.

DANGER

!

Identifi cation colors fl ow
regulators:
E50C: White

6.5.1 Domestic Water quality

Do NOT use toxic chemicals, such as those used for boiler treatment in potable
water heating systems used for space heating.

The sanitary water pipes can be connected to the installation by use of adapter
fi ttings. The cold water inlet on the Combi boilers must be equipped with the following
components (counted in the water fl ow direction):
Flow regulator valve (supplied), Safety group, Expansion vessel 87 PSI / 6bar (potable
water, blue).

The 3/4" NPT adapter fi tting with fl ow reducing valve must be fi tted in the cold water
connection.
A fl ow regulator valve is supplied with the boiler in a 3/4"NPT adapter fi tting. The
fl ow regulator valve ensures that a quantity of water is supplied which has a outlet
temperature of 120°F (assuming a cold water temperature of 45°F). The quantity of
water is virtually unaffected by the water pressure.

When there is a water pressure lower than 22PSI / 1.5 bar it is advisable to
remove the inside mechanism of the fl ow reducing valve.

Appropriate steps must be taken to ensure the brazed plate heat exchanger does
not become plugged by scale caused by hard water or sediment. If the plate heat
exchanger becomes plugged by either scaling from hard water or sediment it is not
the responsibility of Rinnai.

1. Water hardness for DHW

When there is a water hardness of more than 6 to 7 grains hardness for domestic
water, a water softener must be installed on the inlet side of the DHW connection.

2. Sediment in DHW

If there is sediment in your domestic water supply a sediment fi lter or other suitable
device should be used to remove it before the water enters the brazed plate heat
exchanger.

3. Water Chemistry for DHW

The water used for domestic must have a water pH between 6.0 and 8.0, contain less
than 1.7 gpg (20 mg/l) of Sodium, and a concentration of Chlorine less than 5.8 gpg
(100 mg/L).

If problems occur when using sanitary water outside of the above stated
requirements, no recourse can be made to the terms of the limited warranty.

6.5.2 Domestic water treatment Accessory

Rinnai offers a domestic water treatment device that can help reduce scale build up.
This device can be installed on the incoming cold water line for any combi boiler. For
additional information on contact Rinnai.

Installation & Servicing Instructions Rinnai E-Series

22

6.5.3 DHW Expansion Tank

A domestic water expansion tank could be required by local code. Check local code
to determine if it is required.
If a combi boiler is installed in a closed water supply system, such as one having a
backfl 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.

6.5.3 Installing a Thermostatic Mixing Valve

A thermostatic mixing valve should be installed on all E combi boilers on the domestic
hot water side to prevent scalding. This valve will regulate the water temperature
leaving the brazed plate heat exchanger. See the fi gure 10 for the suggest piping.

Mixed water

to fi xtures

Cold water

Sediment fi lter

WRIK-LF-F kit
(WRIK-LF-F 3/4" threaded connection)
WRIK-C kit
(WRIK-C 3/4" sweat connection)

DHW piping with thermostatic mixing valve fi g. 11

Thermostatic

mixing valve

Shut off valve

DHW Pressure

Relief Valve

System Supply System Return

Drain valve

DANGER

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 125º F (51º C) 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 140º F (60º C)
20 seconds at 130º F (54º C)
8 minutes at 120º F (48º C)
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.

Installation & Servicing Instructions Rinnai E-Series

23

6.5.4 Installing a valve kit

NOTICE

i

NOTICE

i

A means to isolate the domestic plate heat exchanger for cleaning must be provide
at installation. Refer to fi gure 10 for proper piping layout. A Rinnai valve kit can be
used on domestic water connections for all combi boilers to allow for cleaning of the
plate heat exchanger and installation the domestic hot water pressure relief valve.

• Rinnai recommends the use of the WRIK-LF-F (3/4” NPT thread connection) or
WRIK-C kit (WRIK-C (3/4” sweat connection) when connecting the domestic water
lines to the boiler

• Use of this kit will assist in fl ushing the fl at plate heat exchanger in areas where
water quality issues exist, as well as improve overall product serviceability

6.5.5 Pressure relief Valve

- An approved pressure relief valve is required by Rinnai for all water heating
systems.

- The relief valve must comply with the standard for Relief Valves and Automatic Gas
Shutoff 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 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 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 pressure relief valve must be manually operated once a year to check for
correct operation.

- The relief valve should be added to the hot water outlet line according to the
manufacturer instructions. DO NOT place any other type valve or shut off device
between the relief valve and the combi boiler.

- Do not plug the relief valve and do not install any reducing fi ttings or other
restrictions in the relief line. The relief line should allow for complete drainage of
the valve and the line.

- 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 situation. Do not plug the relief valve.

- Rinnai does not require a combination temperature and pressure relief valve for
this appliance. However local codes may require a combination temperature and
pressure relief valve.

- If a combi boiler is installed in a closed water supply system, such as one having
a backfl 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.

6.5.6 Programming domestic hot water preheat

When plate warming is selected the brazed plate heat exchanger is kept warm and
this reduces the wait time for domestic hot water by approximately 1 minute. When
this setting is turned off the wait time for DHW is increased by approximately 1 minute.

Plate warming can only be deactivated when the fl ow switch accessory (part
number 805000043) has been installed. If no fl ow switch is installed and
parameter 36 is altered from the factory setting no DHW production will be
possible.

Installation & Servicing Instructions Rinnai E-Series

24

If plate warming is selected consider the following.

NOTICE

i

NOTICE

i

This product is a domestic hot water priority boiler; therefore continuous fl ow
in the DHW system (perhaps due to a leaky fi xture) may cause the boiler to
remain in DHW mode — thus preventing the heating system from adequately
functioning. In the event the DHW system has a leak, this feature should be
turned off until this problem can be corrected.

This selection can be done with the fi rst digit of Parameter 36.
Domestic hot water preheat ON = 1x (Factory setting)
Domestic hot water preheat OFF = 2x
See chapter 10 how to change a parameter.

The domestic hot water preheat setting is designed to increase the comfort of the
home owner and reduce water consumption by reducing the wait time for hot water
at the fi xture. This comfort setting will create a slight increase in the gas usage of the
boiler, but this will be offset by the reduction in wasted water at the fi xture.

6.6 Condensate drain pipe

This boiler produces condensate. Condensate must be drained otherwise the boiler
will not function and can cause product or property damage.

The condensation drain pipe should be connected to a drain in the building by means
of an open connection. By this means the possibility of drain gases effecting the boiler
is prevented. The drain connection should have a minimum diameter of 1.3" / 32mm.

i
i

NOTICE

NOTICE

Install the condensation drain pipe according to applicable local code.

If the condensate outlet of the boiler is lower than the public sewage system a
condensate pump must be used.
The condensate produced by the boiler has a pH value between 3 and 4.
Install a neutralization unit if required by local code. It is recommended, but not
required to install a condensate neutralizer. Rinnai offers a condensate neutralizer
designed to work with all boiler models. The condensate neutralizer kit comes with
all the necessary fi ttings and mounting material. PVC pipe must be supplied by the
installation contractor.
Rinnai part number: 804000074

Do not drain the condensation water to the external rain gutter because of the
danger of freezing and blockage of the drain.

Before putting the boiler into operation fi ll the condensate trap with 1.27 cups /
300 ml of water. If the boiler will be installed in a high temperature installation

such as baseboard with a supply temperature of 160°F or above, fi ll the
condensate trap with mineral oil instead of water.

Use materials approved by the authority having jurisdiction. In absence of such
authority, PVC and CPVC pipe must comply with ASTM D1785, F441 or D2665.
Cement and primer must comply with ASTM D2564 or F493.

Periodic cleaning of the condensate disposal system must be carried out. See
the Rinnai Boiler Application Manual for further information and for a piping
diagram for the condensate.

Installation & Servicing Instructions Rinnai E-Series

25

NOTICE

i

NOTICE

i

6.7 Vent system and air supply system

Provisions for combustion and ventilation air must be made in accordance with section,
Air for Combustion and Ventilation of the National Flue Gas Code, ANSI Z223.1, or
applicable provisions of the local building codes.

- Do not store chemicals near the boiler or in rooms where the air is being supplied

to the boiler. See the list on page 10.

- Do not allow the fl ue gases of other appliances to enter the boiler.

- Keep cabinet free of moisture

In the event that the system has actuated to shut off the main burner gas, do
not attempt to place the boiler in operation. Contact a qualifi ed service agency.

6.7.1 Intake / Exhaust Guidelines

Refer to the specifi c instructions on your vent product for additional installation
requirements.

• For direct vent boilers, proper reassembly and resealing of the vent-air intake
system is required.

• You must use vent components that are certifi ed and listed with this model.

• Do not combine vent components from different manufacturers.

• Venting should be as direct as possible with a minimum number of pipe fi ttings.

• Avoid dips or sags in horizontal vent runs by installing supports per the vent
manufacturer’s instructions.

• Support horizontal vent runs every four feet and all vertical vent runs every six
feet or in accordance with local codes.

• Vent diameter must not be reduced.

• The boiler is unsuitable to install on a common vent installation, see also chapter 18.

• Do not connect the venting system with an existing vent or chimney.

• Do not common vent with the vent pipe of any other combi boiler or appliance.

• Vent connections must be fi rmly pressed together so that the gaskets form an air
tight seal.

• Refer to the instructions of the vent system manufacturer for component assembly
instructions.

• If the vent system is to be enclosed, it is suggested that the design of the enclosure
shall permit inspection of the vent system. The design of such enclosure shall be
deemed acceptable by the installer or the local inspector.

If it becomes necessary to access an enclosed vent system for service or
repairs, Rinnai is not responsible for any costs or diffi culties in accessing
the vent system. The limited warranty does not cover obtaining access to an
enclosed vent system.

Installation & Servicing Instructions Rinnai E-Series

26