Rinnai REU-A2626WG-ZK User manual

Rinnai INFINITY A-Series
continuous ow water heaters
Installation guide
INFINITY A26 INFINITY A24 INFINITY A20 INFINITY A16
REU-A1620WG-ZKREU-A2024WG-ZKREU-A2426WG-ZKREU-A2626WG-ZK
The Rinnai INFINITY A-Series models are not suitable for commercial or solar applications

Important
This appliance must be installed in accordance with:
- Manufacturer’s installation instructions
- Current AS/NZS 3000, AS/NZS 3500, AS/NZS 5601.1 and G12/AS1
For use with Natural Gas or Universal LPG as indicated on the appliance.
Not suitable as a spa or swimming pool heater.
Not suitable for commercial or solar applications.
Appliance must be installed, commissioned and serviced by an authorised
person, being in New Zealand a licensed gasfitter, in accordance with these
instructions and all applicable local rules and regulations.
Warning
Improper installation, adjustment, alteration, service and maintenance can
cause property damage, personal injury or loss of life.
For more information about buying, using, and servicing of Rinnai
appliances call: 0800 RINNAI (0800 746 624).
Rinnai New Zealand Limited
105 Pavilion Drive, Mangere, Auckland
PO Box 53177, Auckland Airport, Auckland 2150
Phone: [phone]
Fax: [phone]
Email: [email protected].nz
Web: rinnai.co.nz
youtube.com/rinnainz
facebook.com/rinnainz

cnt:
Before installation ....................................... 4
Appliance location ......................................4
General installation information .................. 5
Water delivery temperature ........................6
Connections and fittings.............................7
Dimensions (mm)........................................8
Commissioning ...........................................10
PCB interface and dip switch settings..........12
Flue diverter dip switch changes.................14
Appendix 1
Water controller communication cables.....15

4 | A-Series CFWH installation guide 01-18
Before installation
• Check for damage: Unpack the appliance and check for damage. DO NOT install any
damaged items.
• Check components and gas type: Check all components have been supplied and that you
have the correct gas type.
• Read these instructions: Get an overview of the steps required before starting the
installation. Failure to follow these instructions could cause a malfunction of the appliance.
This could result in serious injury and property damage.
• Applicable models: These instructions apply only to the Rinnai A-Series continuous flow
water heater models listed on the cover page of this guide.
Appliance location
This appliance is designed for outdoor
installations only. It MUST BE located above
ground in open air with natural ventilation,
without stagnant areas, where gas leakage
and products of combustion can be rapidly
dispersed by wind and natural convection.
The appliance MUST BE mounted on a vertical
structure with the water and gas connections
on the underside pointing downwards.
Location of the flue terminal MUST BE in
accordance with Section 6 and Figure 6.2 of
the AS/NZS 5601.
The appliance MUST BE placed as close
as practicable to the most frequently
used hot water outlet or outlets to reduce
the delay time for hot water delivery1. For
installations where the distance between the
water heater and the outlets is considerable,
a flow and return system can be used to
minimise the waiting time for hot water
delivery. Alternatively multiple appliances can
be strategically placed to serve outlets with
minimal delay time.
An AC 230 V, 10 A earthed power point must
be provided adjacent2to the appliance. This
power point must be weatherproof. It must be
clear of the gas and water connections to the
appliance and also the flue exhaust and water
pressure relief valve. The power cord of the
appliance is 1.5 m long.
All appliances MUST BE installed to ensure
access can be gained without hazard or undue
difficulty for maintenance and servicing.
Sufficient clearances shall allow access and
removal of all serviceable components.
Appliances should not be mounted more than
2.5 m above the ground or floor level unless
the customer can arrange permanent and safe
access, or can provide another means of safe
access.
Horizontal obstructions
AS/NZS 5601 states a minimum horizontal
clearance of 500 mm between a building
structure and obstruction facing the terminal.
At 500 mm the obstruction needs to be the
full height of the unit (as shown), and not a
partial obstruction. A partial obstruction of
less than 1 m could result in wind pushing the
flue gases back into the flue terminal.
500 mm
At 500 mm the obstruction
needs to be the full height of
the unit.
500 mm
DO NOT
1Rinnai recommend a maximum pipe run of 10 m.
2Power point can be within the pipe cover if a pipe cover is installed—must comply with AS/NZS Wiring rules

A-Series CFWH installation guide 01-18 | 5
General installation information
Securing the Rinnai INFINITY
The wall or structure on which the units are
mounted MUST BE capable of supporting the
weight of the appliance and associated pipe
work. Refer p. 7 for the specific model weight.
Ensure that suitable fixing screws or bolts
are used to secure the unit to the wall, in
accordance with AS/NZS 5601 section 6.
Wooden plugs shall not be used.
The top bracket has a keyhole slot so that the
appliance can be positioned by hanging it on
one screw, once in position the appliance can
then be secured with appropriate fittings.
The appliance can be mounted directly
against the wall or structure. There is no need
to use non-combustible sheeting between the
appliance back panel and the wall or structure
for the purposes of meeting the temperature
hazard requirements of AS/NZS 5601.
Pipe sizing
If the gas pipe sizing is insufficient the
appliance won’t perform properly. Gas pipe
sizing must consider the gas input into this
appliance as well as other gas appliances in the
premises. The gas meter and regulator must
be specified for this gas rate.
An approved sizing chart such as the one in
AS/NZS 5601 should be used. Refer p. 7 for
model specific gas consumption details.
Water pipe sizing and layout should be
performed in accordance with AS/NZS 3500.
All hot water pipe work should be insulated to
optimise performance and energy efficiency.
Water supply
The appliance is intended to be permanently
connected to the water mains.
Refer p. 7 for model specific operational
water pressure limitations. Approved
pressure limiting valves may be required if
the maximum rated water supply pressures
are exceeded. To achieve the rated flow, the
minimum water supply pressures must be
met.
The A-Series water heaters will operate at
lower pressures than the specifications, but
will not achieve the rated flow. Contact Rinnai
for gravity fed or low pressure installations.
Water chemistry and impurity limits are
detailed in the operation guide within the
warranty section. Most metropolitan water
supplies fall within the requirements.
If you are unsure about your local water
quality, contact your water authority. If sludge
or foreign matter is present in the water
supply, a suitable filter or strainer should be
incorporated in the water supply to the Rinnai
INFINITY.
A26

6 | A-Series CFWH installation guide 01-18
Water delivery temperature
Requirements of AS/NZS 3500 MUST BE considered regarding the temperature limitations of hot
water supplied to areas used primarily for personal hygiene. The temperature of these areas may
be limited to 55 °C or less.
If the appliance is to deliver water primarily for the purposes of personal hygiene in an early
childhood centre, school, nursing home or similar facility as defined in AS/NZS 3500.4, a
Temperature Limiting Device (TLD), such as a tempering valve may be required, even if the
appliance is set to 55 °C or less. For these types of applications contact Rinnai.
Diagram 1 - 55 °C Appliance
55 °C
Diagram 2 - Not a 55 °C Appliance
(TLD = Temperature Limiting Device)
> 55 °C > 55 °C < 55 °C < 55 °C
Requirements for Rinnai INFINITY units installed without controllers
When the Rinnai INFINITY is set to deliver water at a temperature higher than 55 °C, it will be
necessary to fit a Temperature Limiting Device for delivery to areas used for the purposes of
personal hygiene.

A-Series CFWH installation guide 01-18 | 7
Connections and ttings
Model Gas consumption
MJ/h
Water Supply kPa
Min. Max.
Weight kg Fittings
Hot Cold Gas
A16 external
REU-A1620WG-ZK
16.3-124 120 1000 13 R½
(15 mm)
R½
(15 mm)
R¾
(20 mm)
A20 external
REU-A2024WG-ZK
19.9-156 160 1000 14 R¾
(20 mm)
R¾
(20 mm)
R¾
(20 mm)
A24 external
REU-A2426WG-ZK
16.3-184 200 1000 15 R¾
(20 mm)
R¾
(20 mm)
R¾
(20 mm)
A26 external
REU-A2626WG-ZK
16.3-199 200 1000 15 R¾
(20 mm)
R¾
(20 mm)
R¾
(20 mm)
Service connection points
An approved full flow isolation valve and disconnection union MUST BE fitted to the cold water
inlet. A non-return valve is not required unless required by local regulations.
Isolation valves MUST NOT be fitted directly to the appliance.
It may be necessary to fit a temperature limiting device for delivery to areas used primarily
for the purposes of personal hygiene, refer previous page for ‘Water delivery temperature’
information.
Purge gas and cold water supply lines to remove air and swarf before final connection. Swarf
in the gas or water supplies may cause damage, a common problem, which is not covered by
warranty.
Hot water connection
From centreline 105 mm
From wall 87 mm
From bottom of unit (A) 41 mm
39 mm (A16)
Cold water connection
From centreline 10 mm
From wall 68 mm
From bottom of unit (D) 50 mm
Electrical connection
Gas connection
From centreline 83 mm
From wall 77 mm
From bottom of unit (C) 40 mm
Cable access
From centreline 36 mm
From wall 125 mm
From bottom of unit (B) 29 mm
Bottom of unit
ABCD

8 | A-Series CFWH installation guide 01-18
Dimensions (mm)
351
330
270
259
531
498 16.5
15 48.9
16.5
734
270
351
330
223
212
531
498 16.5
15 48.9
16.5
270
34 7
The basic dimensions, (height, width, and depth) are the same. The difference
between the models are the dimensions and position of the flue outlet.
351
330
175.5
164.5
16.5
498
17.7
15 48.9
16.5
270
531
734
A26 & A24 A20
A16

A-Series CFWH installation guide 01-18 | 9
1719.1 15
29.5
495.8
571
180
160
80
5.5 x 24 “
long hole
5.5 x 24 “
long hole
Ø 13 hole
41
34
31
489.2
541.2 5 5 7. 2

10 | A-Series CFWH installation guide 01-18
Commissioning
AS/NZS 5601.1, clauses 2.6.8 and 6.11.2, states that every part of a gas installation shall be
commissioned prior to initial use. It is the installer’s responsibility to ensure all current
AS/NZS 5601 requirements are met. The URL’s provided are links to short videos on how key
steps are performed.
The appliance operation must be tested after installation. Ensure the building occupants
do not have access to the hot water outlets during this procedure.
Please note
The Rinnai INFINITY A-Series comes with a factory preset outlet temperature of 55 °C. The
high and low gas operating pressures are also factory preset. Under normal circumstances the
operating pressures do not require adjustment during installation. Make adjustments ONLY if
the unit is not operating correctly and all other possible causes for incorrect operation have
been eliminated.
Inlet supply pressure to the appliance MUST BE checked and set within the operating parameters
of the appliance in all instances.
If the appliance can not be adjusted to perform correctly call 0800 RINNAI (0800 746 624) for
assistance.
WARNING
Steps to commissioning a Rinnai INFINITY A-Series model
Flush water pipes, and gas line
Before final connection of the water heater flush the gas, hot and cold water supply
lines. Swarf in the gas or water supplies may cause damage, a common problem, which
is not covered by warranty.
Connect gas line
Check supply pressure
Operate ALL other gas appliances at their maximum gas rate. With all gas appliances
on maximum the supply pressure must read between 1.13-3.0 kPa on Natural Gas. On
LPG the pressure must be 2.75-3.0 kPa.
If the pressure is lower, the gas supply is inadequate and the appliance will not operate
to specification. It is the installer’s responsibility to check the gas meter, service
regulator and pipe work for correct operation and sizing, and rectify as required.
1
2
Purge the gas line of air
3
Final connection test
4
5

A-Series CFWH installation guide 01-18 | 11
PCB and/or dip switch settings checked.
Refer p.12-14.
PCB settings checked if the factory default temperature has been changed.
Dip switch settings checked if a flue diverter is fitted.
Short video: http://rinnai.co.nz/007
Operate and test for gas leaks
Replace the appliance front cover otherwise the unit won’t operate correctly, and
operate and test for gas leaks using an electronic leak detector.
Operational test—water flow and temperature at the hot water outlets
Confirm the hot water delivery temperatures using a thermometer.
If water controllers are fitted, it is necessary to test their operation through the
complete range of functions, refer separate instructions provided with the water
controllers.
Check cold water inlet filter
Inspect and clean the water inlet filter. This may need to be repeated to ensure the
filter remains clear, especially on new installations.
Short video: http://rinnai.co.nz/006
If you feel the customer is capable of doing this check it would be beneficial to show
them how to inspect and clean the filter as well.
Customer handover
After testing is completed, explain to the customer the functions and operation of the
water heater and water controllers (if fitted).
Also talk to them about the gas, power, and water connections, how frost protection
works, the procedure for draining the water heater, where to find the data plate,
maintenance and servicing. If the customer is not there try and contact them by
phone to relay the important points.
Ensure the installer details section is completed in the operation guide, the
commissioning checklist has been completed and signed, and that guide and checklist
are left with the customer.
6
7
8
9
10

12 | A-Series CFWH installation guide 01-18
PCB interface and dip switch settings
The PCB interface and dip switch settings must only be changed by a licensed
gasfitter. They have been provided as there may be a requirement to change the
temperature of the water delivered from the water heater or change the dip switch
settings if fitting a flue diverter.
Care must be taken when changing the temperature or dip switch settings as they can be
easily switched or bumped into the wrong position. Fully check the operation of the water
heater before leaving including the temperature of the water delivered.
The cover of the water heater will need to be removed to carry out this operation. As this will
expose live mains voltage wiring please disconnect the power supply before removing the
front cover.
We wish to draw your attention to the requirements of the New Zealand Building Code and
compliance document G12. This requires that water delivered to sanitary fixtures be no more
than 55 °C. Increasing the water heater set temperature will require that you protect all sanitary
fixtures to which the appliance is plumbed with suitable tempering valves or something similar.
Rinnai will accept no liability for issues arising out of the use of this information.
If you have any doubts about the performance of the water heater, please contact Rinnai by
phoning 0800 RINNAI (0800 746 624).
The following information details settings for the Rinnai INFINITY A-Series models only. They are
not applicable for other models.
Basic operation of the PCB interface
• To place the PCB into programming mode press PB2 until the LED digital display shows 1,
noting that the current set value will be displayed shortly afterwards.
• To alter a value press PB4, each press of the button will select the next available value.
• To change to another menu, press PB3, each press of the button will select the next available
menu.
• To exit the programming mode and save the selected settings press PB2 until the LED display
goes blank.
Note:
• If no buttons are pressed the PCB will automatically exit programming mode after 10 mins.
• Exiting programming mode sets the value last viewed as the current value.
WARNING

A-Series CFWH installation guide 01-18 | 13
8
ON
1 2 3 4
Communication interface socket
Data transfer button for PCB replacement - push button 1 (PB1)
Data transfer LED, illuminates to show data transfer in progress
MODE button, places the PCB into programming mode (PB2)
MENU button, cycles through available modes (PB3)
Forced combustion rate setting mode, raises the gas pressure
VALUE button, cycles through available values (PB4)
Forced combustion rate setting mode, lowers the gas pressure
Forced high/low selection button, (PB5)
LED digital display, displays menu, value and forced high/low status
Dip switch (factory default all switches are in the off position)
SW1 and SW3 are only set to ON when a flue diverter is fitted, otherwise
they MUST remain set in the OFF position.
SW2 and SW4 are not used and MUST remain set in the OFF position.
PB1
PB2
PB3
PB4
PB5
SW1
SW2
SW3
SW4
Menu Menu description Value
A b C d E F H J
1Gas type ULPG NG N/A N/A N/A N/A N/A N/A
2*Model 2626 2426 2024 1620 N/A N/A N/A N/A
3Fixed / Max. temp 55 °C165 °C 60 °C 50 °C 42 °C 40 °C N/A N/A
4OFF water flow rate + 3 °C2+ 6 °C N/A N/A N/A N/A N/A N/A
550 °C delivery
adjustment temp.
Min
Step 0
Increase
Step 1
Increase
Step 2
Increase
Step 3
Increase
Step 4
Increase
Step 5
Increase
Step 6
Increase
Max
The temperature of outgoing hot water is constantly monitored by a built-in sensor. If the
temperature of the outgoing hot water rises to more than 3 °C (6 °C #) above the selected
temperature shown on the digital monitor or the preset limit when water controllers are fitted,
the burner will automatically go out.
* Values in menu 2 cannot be adjusted.
1Factory default
2OFF water flow rate (+3 °C, factory default)

14 | A-Series CFWH installation guide 01-18
Flue diverter dip switch changes
When delivered ex-factory, by default SW1, SW2, SW3, and SW4 of the DipSW are set
to the OFF position.
If a flue diverter is installed onto the water heater, SW1 and SW3 of the DipSW must
be set to the ON position.
1234
ON
SW1 (OFF)
SW2 (OFF)
SW3 (OFF)
SW4 (OFF)
1234
ON
SW1 (ON)
SW2 (OFF)
SW3 (ON)
SW4 (OFF)
Default dip switch settings as they
are ex-factory.
Dip switch settings required for flue
diverter installation.
The dip switch change for flue diverters is required to increase the combustion fan speed, which
helps overcome the friction losses from have a flue diverter installed on the water heater.

A-Series CFWH installation guide 01-18 | 15
Appendix 1:
Water controller communication cables
Wired water controllers operate at an extra low voltage (12 V DC) which is supplied from the
water heater, a 10 m long communication cable is supplied for connection to the water heater.
Only Rinnai supplied communication cables may be used.
The water heater end of the cables is fitted with spade terminals. Only two pairs of cables
(four spade connectors in total) may be terminated. When attaching three or four cables it is
necessary to join the cable terminators as shown below.
For each pair cut off the existing spade connectors and re-terminate each pair into a new spade
connector (A). Spade connectors are available from your local electrical component retailer
A
Single cables can be used
when terminating up to two
communication cables.
Paired cables are to be used
when terminating three or
four communication cables.
Connecting one or two communication cables
Follow steps one through five below to terminate the cables to the water heater.
Connecting three or four communication cables
To connect three or four cables, separate all the cables to be fitted into pairs.
A
A
A
When
terminating
three cables
When
terminating
four cables
Follow steps one through five below to terminate the joined cable pairs to the water heater.
1. Isolate the power supply by switching the power
point off and removing the power plug of the water
heater from the electric power socket.
2. Removing the retaining screw of the cable connector
at the base of the unit.
3. Swing the cable connector door open and thread the
cable through the weather seal of the cable access
hole, allowing sufficient cable length so that the
sheath of the cable can be secured with the cable
clamp supplied with the transceiver.
4. Loosen the screw terminals and connect the cable
spade connectors to these terminals and re-tighten.
Polarity is not important, either wire colour can be
connected to either terminal.
5. Return the cable connector to the original position,
taking care not to damage the cable wires in the
process, and replace the retaining screw.
Retaining
screw
Cable access
Cable clamp

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