Rinnai Mains Pressure Cylinder Instructions for use

Mains pressure indoor stainless steel cylinders
Owner and installer guide

Important
Cylinders shall be installed in accordance with:
-Manufacturer’s installation instructions
-Current AS/NZS 3000, AS/NZS 3500, and G12/AS1
Installation, servicing and repair shall be carried out only by authorised
personnel.
Not suitable as a spa or swimming pool heater.
-Owner, please retain this guide for future reference
-Installer, please leave this guide with the owner
Warning
Improper installation, adjustment, alteration, service and maintenance
can cause property damage, personal injury or loss of life.
This appliance is not to be used by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience
and knowledge, unless they have been given supervision or instruction.
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]
Web: rinnai.co.nz
youtube.com/rinnainz
facebook.com/rinnainz

About your cylinder...............................................4
Maintenance and servicing...................................4
Troubleshooting....................................................6
Installation
Specication summary .........................................8
Dimensions...........................................................9
Plumbing setup.....................................................10
Storage and delivery temperatures ......................11
Water quality.........................................................12
Electrical supply and connections ........................13
Valves and ttings.................................................14
Commissioning.....................................................14
Limited Warranty ..................................................15
Warranty examples in the real-world ....................18
Proof of purchase .................................................19
Installer details......................................................19
Contents

4 | MP indoor stainless steel cylinders: Owner and installer guide: 20132-I 09-20
About your cylinder
Safety messages
• Element cover
Do not remove the
element cover as this will
expose 230 V wiring and
must only be removed by
an authorised person.
• Thermostat setting
Must only be adjusted
by an electrician or
other suitably qualied
tradesperson.
• Damaged components
If any component is
damaged, it must be
replaced by an authorised
person using Rinnai
replacement parts.
• Child supervision
Children should be
supervised to ensure they
do not play with any part of
the hot water system.
• Hot pipe work
Care should be taken not
to touch the pipe work
from the cylinder as this
could be very hot.
Safety devices
Your cylinder is tted with a:
• Temperature & Pressure
and Relief (TPR) valve,
designed to automatically
release water in the
event that temperature
or pressure exceeds safe
levels.
• Automatic thermostat
to maintain water
temperature.
• Temperature override
cutout for heating element.
In the case of a standard
cylinder (not installed in
a solar application), the
operation of the thermal
cutout can indicate a
dangerous situation. Do
not reset the thermal
cutout until the water
heater has been serviced
by a qualied person.
Do not operate the system
unless all the safety devices
are tted and are in working
order. It is also important that
you do not tamper or remove
any of these devices.
Cylinder thermostat setting
To meet the New Zealand
Building Code requirement1to
disinfect water for legionella
bacteria2, the thermostat has
been set to 65 °C.
Turning the cylinder on/o󰀨
If you plan to be away for a
few nights we suggest you
leave the system switched on.
If it is necessary to switch it
o󰀨, when switching back on,
remember that the cylinder
will take time to heat back up
again.
Draining and lling the
system
This normally occurs during
installation or servicing and
must be carried out by an
authorised person.
Installation by a licensed
tradesperson
Only a licensed tradesperson
can install, adjust, maintain,
and service this water heater.
Any work carried out by a
non-licensed tradesperson
is illegal and will void any
warranty.
Important
All cylinders have the potential to leak water. To minimise damage to other
areas of your home, ensure that your cylinder has been installed with a drip
tray—the person doing the installation is responsible for this.
* Refer to the warranty terms and conditions in this guide for more information.
1Clause G12.3.9, Acceptable Solution G12/AS1 6.14.3
2 Legionella is a bacterium that can cause Legionnaires’ disease―a severe form of pneumonia
Water is heated by an electric element, or elements located in the cylinder. The temperature of the
water is controlled by an automatic thermostat that is set by your installer, usually to 65 °C.

MP indoor stainless steel cylinders: Owner and installer guide: 20132-I 09-20 | 5
Maintenance and servicing
Hot water systems, like cars, require regular maintenance and servicing. To ensure
longevity of your cylinder we recommend the following.
Period What needs to be done
Every six months TPR (temperature & pressure relief) operate the easing gear
Year ve Inspection and service the entire hot water system, including element*
Every 24 months after
year ve
Inspection and service the entire hot water system, including element*
* In hard water areas the element(s) must be periodically descaled. To do this the cylinder must be drained and the
element(s) removed
TPR valve
This valve is located near
the top of the cylinder and is
essential for safe operation.
The TPR valve works by
automatically venting hot
water if the temperature or
pressure of the water in the
cylinder gets too high.
Every six months operate the
easing gear to remove lime
deposits and to check that
it is not blocked. As this will
discharge hot water, ensure
no one is near the drain line.
Failure to operate the
relief valve easing
gear at least once
every six months may
result in the water
heater exploding.
Continuous leakage
of water from the
valve may indicate a
problem.
It is important that you raise
and lower the easing gear
gently. During the operation, if
the valve does not discharge
water when the easing gear
is lifted, or does not seal
again when closed, arrange
for an authorised person to
come and inspect the system
immediately.
During servicing of
your cylinder the
TPR valve needs to
be checked and/or
replaced. This needs
to be done by an
authorised person at
intervals not exceeding
ve years, or more
frequently in areas
where the water is
classied as hard.
A TPR valve must not be
replaced with one that has a
higher pressure rating than
that specied for the cylinder.
Maintenance and servicing
Rinnai has a maintenance,
service, and spare parts
network with personnel who
are fully trained and equipped
to give the best advice on
your Rinnai product. Regular
maintenance and servicing
is not covered by the Rinnai
warranty.
For help locating a service
person in your area call 0800
RINNAI (0800 746 624).
Lift until water flows
from the drain line,
lower gently
To
water
heater
To drain line
How to operate the easing gearTPR position - top
of cylinder
Insulated TPR valve for the
250 and 300 L cylinders
WARNING
IMPORTANT

6 | MP indoor stainless steel cylinders: Owner and installer guide: 20132-I 09-20
Troubleshooting
Do not attempt to carry out any work other than that mentioned in this troubleshooting section. If
you have any other faults or problems, please contact your installer, or contact Rinnai.
Problem Possible solution
Lack of hot
water or no hot
water
Is there electricity supply to the cylinder?
Check that the isolating switch marked ‘hot water’ or ‘water heater’, at the
meter box, is switched on. Also check any isolating switches near the water
heater are switched on.
Check the fuse or circuit breaker marked ‘hot water’ or ‘water heater’ at
the meter box. Repeated failure of the fuse or tripping of the circuit breaker
indicates a fault, which must be investigated by an authorised tradesperson.
Most hot water cylinders are controlled at peak times by your electricity
supplier via a ripple relay. Contact your electricity supplier to determine if there
have been any issues with the power supply.
Lack of hot
water or no hot
water
Are you using more hot water than you think?
Often you don’t realise how much water is actually being used. This applies
especially when showering. Typical ow rates for showers is approximately
8-10 litres per minute. Conduct a simple experiment by placing a measured
bucket under your shower for ten seconds and multiply by six to determine
the amount of water produced over a minute. If your result is signicantly
more than the rates mentioned you may want to consider installing a low ow
shower rose―available at all good plumbing stores.
Lack of hot
water or no hot
water
Cold water relief valve discharging continuously?
It is normal for the cold water relief valve to discharge a small quantity of water
through the drain line. If water is discharging continuously there may be a fault
with one of the valves, contact the installer to discuss.
Water is too hot If possible check the temperature of the water coming out of a hot water tap
with a thermometer. If it is higher than 55 °C then this indicates a problem with
your system—contact an electrician for advice.
High electricity
bills
If you think your electricity bill is too high, investigate the following:
• Has your electricity tari󰀨 changed?
• Is your cold water relief valve discharging continuously?
• Are you using more hot water than normal?
• Has there been any leaking hot water pipes, or taps?

Installation
Installation, servicing and repair
shall be carried out only by
authorised personnel.

8 | MP indoor stainless steel cylinders: Owner and installer guide: 20132-I 09-20
Specication summary
Suitability
• Indoor mains and low pressure systems
• Residential and commercial applications
• Left or right hand cold inlet connections
Not suitable as a pool or spa heater.
The 180 L, 250 L, and 300 L cylinders can be
connected to an open loop solar or hot water
heat pump system via the eco connection.
System should be located and arranged so as
to achieve the closest proximity to water draw
o󰀨 points.
Not suitable for bore or tank water, or for
mains supply where the water is hard and/or
aggressive. Refer p.12 and p.17 for cylinder
water quality and impurity limits.
Operating pressures
Maximum working pressure = 850 kPa
Element
Incoloy 825 alloy sheath curved element
positioned at the bottom of the cylinder, and
midway if a dual element is purchased.
Thermostat
The thermostat setting is between 60-80 °C.
Standard cylinder
Robert Shaw 30 A contact
thermostat, manually resettable at
85 °C (yellow dial).
Cylinder in a solar installation
Robert Shaw 30 A contact auto-
reset thermostat (red dial).
Weights empty full
• 135 L: 27 kg 162 kg
• 180 L: 32 kg 212 kg
• 250 L: 41 kg 291 kg
• 300 L: 47 kg 347 kg
Pressure limiting (reducing) valve
This water heater MUST be installed with a
500 kPa or less pressure limiting valve and
appropriate cold water expansion valve.
TPR valve
A temperature and pressure relief valve is
supplied with the water heater and MUST be
tted. A TPR insulation kit, to reduce heat loss,
is also supplied with the larger 250 and 300 L
cylinders—this also needs to be tted.
The TPR valve thread should be sealed with
teon tape, do not use paste and hemp. Use
the spanner ats on the valve body to tighten,
DO NOT use a wrench on the valve body.
The TPR valve must be tted with a drain pipe
to direct any water discharged to a visible point
outside the property. The drain pipe must have
a continuous fall and be at least the same size
as the TPR valve outlet (½ ˝BSP). Where the
drain pipe exceeds three metres in length it is
recommended an air break be provided within
300 mm of the TPR valve outlet. Where an air
break is used it is recommended that the pipe
size after the air break be increased to one
size larger than the TPR valve. It must also be
protected from freezing conditions.
Protection against water
IPX1

MP indoor stainless steel cylinders: Owner and installer guide: 20132-I 09-20 | 9
Height
Upper element
Ø 550 mm
½ “ female TPR (all sizes)
460 mm
310 mm
½ “ female eco inlet
(180, 250, 300 L only)
¾ female“ side
cold inlet (all sizes)
Hot water outlet ¾ “ female
Side cold inlet
Element
Side cold inlet
TPR
40°
40°
45°
325 mm
TPR
Tank size Upper element TPR Height
135 L N/A 690 mm 1015 mm
180 L N/A 970 mm 1295 mm
250 L 1080 mm 1410 mm 1730 mm
300 L 1380 mm 1725 mm 2045 mm
Dimensions

10 | MP indoor stainless steel cylinders: Owner and installer guide: 20132-I 09-20
Cylinders should be installed in accordance with G12/AS1, and AS/NZS 3500.4:2018. For servicing
and maintenance, please allow su󰀩cient room for access to covers and valves.
For ease of reference, the below diagrams have been reproduced from AS/NZS 3500.4:2018 and
were accurate at the time of print, always refer to the latest standard.
Fitting a dedicated cylinder drain, separate from any other valve, is highly recommended to enable
servicing of the water heater to be undertaken.
Plumbing setup
Mains
pressure
storage
water
heater
To drain
(see clause 5.11)
Heated water outlet
Heat trap
Temperature/pressure
relief valve
Drain pipe
Heat trap (optional)
Expansion control (see Figure 5.9.4(A))
Pressure-limiting valve
(where required)
Cold water inlet
Line strainer (where fitted)
Figure 5.9.4(C) TYPICAL INSTALLATION OF A MAINS PRESSURE STORAGE WATER HEATER
Expansion control valve
(see Clause 5.9)
Expansion control valve drain line
(see Clause 5.11)
Isolating valve
Strainer (where fitted)
Non-return valve
Pressure-limiting valve or
pressure-reducing valve
(where required)
(a) Typical assembly incorporating a pressure-limiting or pressure-reducing valve using an expansion control valve
Isolating valve
Strainer (where fitted) Pressure-limiting valve or
pressure-reducing valve
(where required)
Expansion vessel
(Clause 5.9)
(b) Typical assembly with no pressure-limiting or pressure-reducing valve using an expansion vessel
Note: Expansion control valve may be combined with the pressure-limiting valve.
Figure 5.9.4(A) TYPICAL INSTALLATION OF VALVES
Mains
pressure
storage
water
heater
To drain
(see clause 5.11)
Heated water outlet
Heat trap
Temperature/pressure
relief valve
Drain pipe
Heat trap (optional)
Expansion control (see Figure 5.9.4(A))
Pressure-limiting valve
(where required)
Cold water inlet
Line strainer (where fitted)
Figure 5.9.4(C) TYPICAL INSTALLATION OF A MAINS PRESSURE STORAGE WATER HEATER
Expansion control valve
(see Clause 5.9)
Expansion control valve drain line
(see Clause 5.11)
Isolating valve
Strainer (where fitted)
Non-return valve
Pressure-limiting valve or
pressure-reducing valve
(where required)
(a) Typical assembly incorporating a pressure-limiting or pressure-reducing valve using an expansion control valve
Isolating valve
Strainer (where fitted) Pressure-limiting valve or
pressure-reducing valve
(where required)
Expansion vessel
(Clause 5.9)
(b) Typical assembly with no pressure-limiting or pressure-reducing valve using an expansion vessel
Note: Expansion control valve may be combined with the pressure-limiting valve.
Figure 5.9.4(A) TYPICAL INSTALLATION OF VALVES