AquaMAX EM50 User Manual
Owner’s Guide
and
Installation Instructions
Domestic Mains Pressure
Electric Storage Water Heater
EM50 and E80 to E400 Series
This water heater must be installed and serviced by a qualified person.
Please leave this guide with the householder.
Warning: Upon completion of the installation and commissioning of the
water heater, leave this guide with the householder or responsible officer.
DO NOT leave this guide inside the cover of the water heater, as it may
interfere with the safe operation of the water heater or ignite when the
water heater is turned on.
Patents
This water heater may be protected by one or more patents or registered
designs in the name of Aquamax Australia Pty Ltd.
Trademarks
®
Registered trademark of Aquamax Australia Pty Ltd.
TM
Trademark of Aquamax Australia Pty Ltd.
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CONTENTS
Householder: Read the section “About Your Water Heater” (pages 3 to
16). The “Installation” section is intended for the installer but may be of
interest.
ABOUT YOUR WATER HEATER ................................................................ 3
Model Type ................................................................................................ 3
Turning On the Water Heater .................................................................... 6
Shut Down Procedure ............................................................................... 6
Temperature Adjustment ........................................................................... 6
Other Important Information ...................................................................... 7
Periodic Maintenance ................................................................................ 8
Water Chemistry...................................................................................... 11
Troubleshooting ...................................................................................... 14
INSTALLATION .......................................................................................... 16
Installation Overview ............................................................................... 16
Water Supplies ........................................................................................ 18
Plumbing & Plumbing Diagrams ............................................................. 18
Plumbing Connections ......................................................................... 18
Two Temperature Zones Using a Temperature Limiting Device......... 23
Circulated Hot Water Flow & Return Systems .................................... 24
Electrical & Electrical Connections.......................................................... 25
Thermostat Adjustment ....................................................................... 26
Commissioning ........................................................................................ 27
Draining the Water Heater ...................................................................... 28
Dimensions & Technical Data ................................................................. 29
WARRANTY ............................................................................................... 31
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50 Litre
80 Litre
125 Litre
160 Litre
250 Litre
315 Litre
400 Litre
Legend
E or EM
(50L Only)
50, 80
, ,...
400
S
T
18, 24, 36, 48
X
L
ABOUT YOUR WATER HEATER
Product Application
This water heater is designed for use in a single family domestic dwelling
for the purpose of heating potable water. Its use in an application other
than this may shorten its life.
Model Type
Aquamax® electric storage water heaters are available with either a single
heating unit or with twin heating units (refer to “Single Element Model” and
“Twin Element Model” on page 4). The water heater can be installed in an
indoor or outdoor position and is not to be used as a pool heater.
Water is stored in a vitreous enamel lined steel cylinder and is heated by
an electric immersion heating unit (element). The thermostat controls water
temperature whilst automatic safety controls fitted to the water heater
provide safe and efficient operation.
Model Selection Chart
EM50S36 E80S18 E125S18 E160S18 E250S24 E315S36 E400S36
EM50S18L E80S24 E125S24 E160S24 E250S36 E315S48 E400S48
EM50S24L E80S36 E125S36 E160S36 E250S48 E315T36 E400T36
E125S48 E160S48 E250T36 E315T48 E400T48
E160T24 E250T48
E160T36
E160T48
E160S18X
E160S24X
E160S36X
E160S48X
Note: All models can be supplied with a ‘Hard Water Anode’. These models
have the suffix ‘HWA’ at the end of the model number.
Electric Series 240V AC, 50Hz
Rated hot water delivery in Litres
Single bottom element
Twin element *
Element wattage (1800W, 2400W, 3600W, 4800W)
Special short version
Fitted with a 240V AC, 10A power supply lead & plug
* Both elements are of the same wattage and are wired for non simultaneous
operation.
3
Single Element Model
This type of water heater has one heating unit with its own
thermostat. The heating unit is at the base of the water
heater and the unit can be connected to a continuous or
off-peak electricity supply. The thermostat is adjustable
between 60 ~ 75°C with a factory setting of 65°C (70°C for
EM50 models).
• Continuous electricity supply
This type of connection is suited to where the storage
capacity is less than the normal daily usage.
• Off-Peak electricity supply
This type of connection will only allow heating to occur
during set hours. A volume of water sufficient for the
day’s total use is heated and stored. This type of
heating will be more economical due to reduced tariffs
by the electricity authority.
Twin Element Model
This type of water heater has two heating units, each with its own
thermostat. One heating unit is at the base of the water heater and the
other near the top. The lower thermostat is adjustable between 60 ~ 75°C
(factory setting 70°C) whilst the top thermostat is fixed at 60°C.
• Bottom heating unit (main heating unit)
During normal operation this heating unit supplies all
the hot water.
• Top heating unit (booster)
This heating unit only operates during periods of high
demand to provide an additional supply of heated
water.
• Electrical connection
The two heating units are wired for non simultaneous
operation so that only one heating unit can operate at a
time. The bottom heating unit is usually connected to an
Off-Peak (overnight) or time controlled electricity supply
and the top heating unit to a continuous supply. Some
electricity suppliers allow both heating units to be
metered at the Off-Peak or controlled tariff.
Note: Power must be available to the top heating unit circuit at all times for
this water heater to operate as designed.
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Mains Pressure Operation
This water heater is designed to operate at mains pressure by connecting
directly to the mains water supply. If the mains supply pressure in your area
exceeds that shown in “Mains Water Supply” on page 18, a pressure
limiting valve must be fitted. The supply pressure should be greater than
350 kPa for true mains pressure operation to be achieved.
Hot Water Temperature
This water heater features an adjustable thermostat which can be set to the
most suitable temperature for your hot water needs. Refer to “Temperature
Adjustment” on page 6.
To meet the requirements of the National Plumbing Standard and to inhibit
the growth of legionella bacteria, the temperature of the stored water must
not be below 60°C which is the minimum thermostat setting of the water
heater. This is also the top heating unit thermostat setting on a twin
element model (the top heating unit thermostat is non adjustable).
The maximum main heating unit thermostat setting is 75°C with a factory
setting of 70°C for EM50 and twin element models (top element fixed at
60°C) and a factory setting of 65°C for all other single element models.
High Hot Water Temperature Increases the Risk of Scald Injury
Warning: This water heater can deliver water at temperatures which
can cause scalding. Always check the water temperature before use, such
as when entering a shower or filling a bath or basin, to ensure it is suitable
for the application and will not cause a scald injury. Aquamax recommends
monthly temperature checks to ensure the appropriate temperature is
maintained within the hot water heater.
Aquamax recommends, and it may also be required by regulations, that a
secondary device such as an approved temperature limiting device or antiscald water shut off valve be fitted into the hot water pipe work to the
bathroom(s) and ensuite(s) if persons living in the house require additional
safety protection from potential scalding. This will keep the hot water supply
temperature to the bathroom(s) and ensuite(s) below 50°C which will
reduce the risk of scald injury whilst still allowing hotter water (60°C+) to the
kitchen and laundry.
For new hot water installations, all sanitary outlet fixtures used primarily for
personal hygiene purpose must deliver hot water not exceeding 50°C. This
temperature limit is not mandatory for kitchen sinks and laundry tubs and
the preferable temperature setting for these outlets should be 60°C.
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To minimise scalding, especially for those people in high scald risk
categories i.e. young children, people with potentially incapacitating
medical conditions, elderly people etc, this water heater must be installed in
accordance with AS/NZS 3500.4.
This appliance is not intended for use 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
concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the
appliance.
For early childhood centres, primary and secondary schools, nursing
homes or similar facilities for young, aged, sick or disabled persons, please
consult your local health authority for the correct temperature setting.
Turning On the Water Heater
Warning: The water heater can only be switched on upon completion
of the installation by a qualified person.
To turn on the water heater:
1. Fully open the cold water isolation valve at the cold water inlet to the
water heater.
2. Switch on the circuit breaker or isolator marked “Hot Water” or “Water
Heater” at the switchboard.
Shut Down Procedure
If it is necessary to turn off the water heater:
1. Switch off the circuit breaker or isolator marked “Hot Water” or “Water
Heater” at the switchboard or switch off the water heater isolating
switch if one is installed.
2. Close the cold water isolation valve at the cold water inlet to the water
heater.
Temperature Adjustment
The thermostat automatically controls the electricity supply to the heating
unit so that a constant temperature is maintained within the storage
cylinder. The thermostat is fully automatic and power is only used when the
water in the storage cylinder requires heating. There is no need to switch
the water heater off when it is not in use, except when you are going away
for an extended period.
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Warning: The thermostat and its protective over temperature cut out
are mounted inside the front cover(s) of the water heater. The removal of
the front cover(s) will expose 240V wiring. Access covers must only be
removed by an electrician or qualified person.
Warning: Thermostat temperature adjustment must only be performed
by an electrician or qualified person.
Warning: Children should be supervised to ensure they do not interfere
with the water heater.
Other Important Information
Going Away?
If you plan to be away from home for one or two nights, we suggest you
leave the water heater switched on. However, if you plan to stay away
more than a few nights, conserve energy by switching the water heater off
at either the switchboard or isolating switch (if fitted).
Note: When switched back on, the water heater may take 2 ~ 6 hours to
reheat depending upon element and water heater size. If connected to an
off peak system, hot water may not be available until the following morning.
Safety
This water heater is supplied with a thermostat, an over temperature and
energy cut out, and a combination pressure temperature relief valve. These
devices must not be tampered with or removed. The water heater must not
be operated unless each of these devices are fitted and are in working
order.
The Aquamax warranty may not cover faults if relief valves or other safety
devices are tampered with or if the installation is not in accordance with
these instructions.
Warning: For continued safety of this water heater, it must be installed,
operated and maintained in accordance with the Owner’s Guide and
Installation Instructions. These instructions must be read in conjunction with
all other instructions affixed to the appliance.
Warning: For models with a power supply lead and plug; take care not
to touch the power plug with wet hands.
Warning: For models with a power supply lead and plug; if the power
lead is damaged, it must be replaced by an electrician or qualified person in
order to avoid a hazard.
7
How Long Will the Water Heater Last
The water heater is supported by a manufacturer’s warranty (refer to page
31). There are a number of factors that will affect the length of service the
water heater will provide. These include but are not limited to the water
chemistry, the water pressure, the water temperature (inlet and outlet) and
the water usage pattern.
Precautions
Where damage to property can occur in the event of the water heater
leaking, the water heater must be installed in a safe tray. Construction,
installation and draining of a safe tray must comply with AS/NZS 3500.4
and all local codes and regulatory authority requirements.
The water heater must be maintained in accordance with the Owner’s
Guide and Installation Instructions. Refer to “Periodic Maintenance” below.
If this water heater is to be used where an uninterrupted hot water supply is
necessary for your application or business, you should ensure that you
have back up redundancy within the hot water system design. This should
ensure the continuity of hot water supply in the event that this water heater
was to become inoperable for any reason. We recommend you seek advice
from your plumber or specifier about your needs and building back up
redundancy into your hot water supply system.
Periodic Maintenance
Minor Six Monthly Maintenance
It is recommended minor maintenance be performed every six months by
the dwelling occupant.
Warning: Exercise care when operating easing levers as water
discharged from the water heater may be of a very high temperature.
Minor maintenance actions:
1. Operate easing lever on pressure temperature relief valve (refer to
“Pressure Temperature Relief Valve” on page 9).
2. Operate easing lever on expansion control valve (if ECV fitted) (refer
to “Expansion Control Valve” on page 10).
3. If an overflow tray is installed, check to ensure the overflow tray drain
pipe is not blocked.
8
Major Five (5) Year Service
It is recommended a major five (5) year service be conducted on the water
heater. Servicing must be performed by a qualified person. Phone
Aquamax Service or their nearest Accredited Service Agent.
Note: The five (5) year service and routine replacement of any
components, such as the anode and relief valve(s), are not included in the
Aquamax warranty. A charge will be made for this work.
Major five (5) year service actions:
1. Replace pressure temperature relief valve.
2. Inspect and flush expansion control valve (if ECV fitted) and replace
expansion control valve if required.
3. Inspect anode and replace anode if required. If the anode is not
replaced, it should be replaced within three (3) years of this service.
Refer to “Anode” on page 10.
4. Check electric heating unit for excessive calcium build up or corrosion
and replace heating unit if required.
5. Visually check water heater for any potential problems.
6. Inspect all plumbing and electrical connections.
Note: The water heater will need to be drained during this service and will
take some time to reheat the water after servicing has been completed.
Depending upon the power supply connection, hot water may not be
available until the next day.
Pressure Temperature Relief Valve (PTR valve)
The PTR valve is near the top of the water heater and is essential for safe
water heater operation. It is possible for the PTR valve to release a little
water through the drain line during each heating period. This occurs as the
water is heated and expands by approximately 1/50 of its volume.
Continuous leakage of water from the PTR valve and its drain line may
indicate a problem with the water heater (refer to “Pressure Temperature
Relief Valve Running” on page 15).
Warning: Never block the outlet of the PTR valve
or its drain line for any reason.
Operate the easing lever on the PTR valve once every
six months. It is very important you raise and lower
the lever gently.
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Warning: Exercise care when operating easing lever as water
discharged from the water heater may be of a very high temperature.
Warning: Exercise care to avoid any splashing of water, as water
discharged from the drain line will be hot. Stand clear of the drain line’s
point of discharge when operating the valve’s lever.
Danger: Failure to perform this procedure may result in the water
heater storage cylinder failing.
If water does not flow freely from the drain line when the lever is lifted, then
the water heater must be checked. Phone Aquamax Service or their
nearest Accredited Service Agent to arrange for an inspection.
The pressure temperature relief valve should be replaced at intervals not
exceeding five (5) years, or more frequently in areas where there is a high
incidence of water deposits (refer to “Water Chemistry” on page 11).
Expansion Control Valve (ECV)
In many areas, including South Australia, Western Australia and scaling
water areas, an ECV is fitted to the cold water supply line to the water
heater (refer to the “Cold Water Supply Plumbing Arrangement” diagram on
page 19). The ECV may discharge a small quantity of water from its drain
line during the heating period instead of the PTR valve on the water heater.
Operate the easing lever on the expansion control valve once every six
months. It is very important that you raise and lower the lever gently.
The expansion control valve should be checked for performance or
replaced at intervals not exceeding five (5) years, or more frequently in
areas where there is a high incidence of water deposits (refer to “Water
Chemistry” on page 11).
Anode
The anode installed in your water heater has been designed to slowly
dissipate whilst protecting the storage cylinder. If the hot water heater is not
used for two (2) weeks or more, a quantity of hydrogen gas, which is highly
flammable, may accumulate in the water heater. To dissipate this gas
safely, it is recommended that a hot tap be turned on for several minutes or
until discharge of gas ceases. Use a sink, basin, or bath outlet, but not a
dishwasher, clothes washer or other appliance. During this procedure,
there must be no smoking, open flame, or any electrical appliances
operating nearby. If hydrogen is discharged through the tap, it will probably
make an unusual sound similar to air escaping.
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