Rheem W2W Series, 15kW, 35kW Owner's Manual And Installation Instructions
This water heater must be installed and serviced by an qualified person.
Please leave this guide with a responsible officer.
Owners Guide
and
Installation Instructions
Commercial Water to Water
Heat Pump Water Heater
WMKA21549
PATENTS
This water heater may be protected by one or more patents or registered designs.
® Registered trademark of Rheem Australia Pty Ltd.
™ Trademark of Rheem Australia Pty Ltd.
Notice to Victorian Customers from the
Victorian Plumbing Industry Commission.
This water heater must be installed by a licensed person as required by
the Victorian Building Act 1993.
Only a licensed person will give you a Compliance Certificate, showing that
the work complies with all the relevant standards. Only a licensed person will
have insurance protecting their workmanship for 6 years. Make sure you use
a licensed person to install this water heater and ask for your Compliance
Certificate.
3
CONTENTS
RESPONSIBLE OFFICER – We recommend you read pages 4 to 18.
The other pages are intended for the installer but may be of interest.
Contents ....................................................................................... 3
About Your Water Heater ............................................................ 4
How Your Water Heater Works ................................................... 8
Regular Care .............................................................................. 12
Water Supplies ........................................................................... 14
Save A Service Call ................................................................... 16
Installation .................................................................................. 19
Heat Pump And Tank Assembly .............................................. 31
Manifold Installations ................................................................ 35
Connections – Plumbing .......................................................... 38
Commissioning .......................................................................... 56
Draining The Water Heater ....................................................... 68
TROUBLE SHOOTING ............................................................... 68
Rheem Heat Pump Water Heater Warranty - Australia & New
Zealand Only - ............................................................................ 70
4
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for the purpose of heating potable water by
simultaneously reducing building chilling load. Its use in an application other than
this may shorten its life.
MODEL TYPE
Congratulations for choosing a Rheem®
commercial water to water (W2W) heat
pump water heater. The Rheem W2W
heat pump water heater is designed for
outdoor or indoor installation.
HOW HOT SHOULD THE WATER BE?
The heat pump (compressor, evaporator
and condenser) will operate until a water
temperature of up to 65C is reached.
To meet the requirements of the National
Plumbing Standard (AS/NZS3500.4) the
temperature of the stored water must not
be below 60C.
HOTTER WATER INCREASES THE
RISK OF SCALD INJURY
This water heater can deliver water at
temperatures which can cause scalding.
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 scald
injury.
We recommend and it may also be required by regulations that an approved
temperature limiting device be fitted into the hot water pipe work to the bathroom
and ensuite when this water heater is installed. This will keep the water
temperature below 50C (55C in NZ) at the bathroom and ensuite. The risk of
scald injury will be reduced and still allow hotter water to the kitchen and laundry.
TEMPERATURE ADJUSTMENT
Set Point Quick Setting
Press ‘prg’ from the main display screen and the Set Point page will appear.
Cursor will be on the set temperature. Pressing the up and down keys will
adjust the setting in 0.1 increments. Hold down for rapid change. Press ’Enter’
to confirm change. Press ‘esc’ to return to the main display screen. Refer to
page 51 for more information.
minimum recommended
stored water temperature
maximum recommended
supply temperature to
bathrooms and ensuites
ABOUT YOUR WATER HEATER
5
WARNING
This water heater is only intended to be operated by persons who have the
experience or the knowledge and the capabilities to do so. This water heater is
not intended to be operated by persons with reduced physical, sensory or mental
capabilities i.e. the infirm, or by children. Children should be supervised to ensure
they do not interfere with the water heater.
This water heater uses 415V / 240 V AC electrical power for operation of the
control systems and other electrically operated components. The removal of the
access cover(s) will expose 415V / 240 V wiring. They must only be removed by
a qualified person.
SAFETY
This water heater is supplied with built in Rheem IQ Controller which controls low
and high pressure switches, low temperature cut off, temperature safety switch
and flow switch.
Additionally, the compressor is fitted with thermal overload protection, the
condenser heat exchanger is fitted with a pressure relief valve and the storage
tanks are supplied with a combination temperature pressure relief valve. These
devices must not be tampered with or removed. The water heater must not be
operated unless each of these devices is fitted and is in working order.
If the electrical supply conduit to the water heater is damaged, it must be
replaced by a qualified person in order to avoid a hazard. Phone your nearest
Rheem Service Department or Accredited Service Agent (or Service Centre in
NZ) to arrange for an inspection.
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.
The Rheem 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.
ABOUT YOUR WATER HEATER
6
TO TURN OFF THE WATER HEATER
Switch off the electrical supply at the isolating switch to the water heater
Close the cold side and hot side water isolation valve at the inlets to the water
heater.
TO TURN ON THE WATER HEATER
First, ensure the water is connected to storage tanks, the system is filled with
water and all valves between the tanks and the water heater are open
Open the cold side and hot side water isolation valve fully at the inlets to the
water heater.
Switch on the electrical supply at the isolating switch to the water heater.
Note: The water heater may not turn on immediately when it is first switched on,
if it is switched on within 20 minutes to 2 hours of it having been switched off at
the isolating switch, or the heat pump has just completed a heating cycle. The
water heater will wait until the conditions for start-up are favourable in order to
protect the compressor from damage. This may take up to 20 minutes to 2 hours.
The auxiliary booster will operate instead of the heat pump if the heat pump is in
fault or sufficient energy is not available from the chiller.
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on page 19. The water heater must be
installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS/NZS 3000 and all local
codes and regulatory authority requirements.
In New Zealand, the installation must also conform with Clause G12 of the New
Zealand Building Code.
DOES THE WATER CHEMISTRY AFFECT THE WATER HEATER?
This advice relates to the cold water side and hot water side of the heat
pump water heater.
The water heater is suitable for most public water supplies, however some
water chemistries may have detrimental effects on the water heater, its
components and fittings. Refer to “Water Supplies” on page 14. If you are
not sure, have your water chemistry checked against the conditions described
on pages 14 to 15.
ABOUT YOUR WATER HEATER
7
HOW LONG WILL THE WATER HEATER LAST?
Your water heater is supported by a manufacturer’s warranty (refer to page 72).
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, temperature (inlets and outlets) 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 or be suitably bunded.
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 “Regular Care” on page 12.
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 were 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.
ENVIRONMENT
At the end of the service life of the heat pump water heater and prior to the water
heater being disposed of, a person qualified to work with refrigerants must
recover the refrigerant from within the sealed system. The refrigerant must not
be vented to atmosphere. Phone your nearest Rheem Service Department or
Accredited Service Agent (or Service Centre in NZ) to arrange for an inspection.
8
HOW YOUR WATER HEATER WORKS
The Rheem commercial water to water heat pump is an instantaneous type and
does not have an integral storage cylinder. The unit is designed to be installed
indoors or outdoors. The water heater’s evaporator absorbs heat from the
returning chilled water circuit or condenser loop and transfers this heat into the
potable water. A circulator transfers
the heated water to a bank of storage
tanks. By taking heat from the chilled
water circuit, the heat pump reduces
load on chiller as colder water returns
to the building chiller circuit. The heat
pump produces a sound level of up to
59 dBA (measured at 3 metres) when
it is operating.
When hot water is drawn off and cold water enters the storage tanks, a remote
thermostat activates the compressor and circulating pumps of the water heater.
The chiller return water (building heat) is drawn in through the cold side inlet and
then through the evaporator (single wall heat exchanger), where heat is
transferred to a refrigerant fluid. The fluid is compressed and passes to the
condenser (double wall heat exchanger) where heat is transferred into the
potable water. The pump circulates water from the bottom of the storage tanks
through the heat exchanger and the heated water is circulated back into the
storage tanks. This process continues until the water in the storage tanks
reaches the set temperature.
The heat pump is designed to operate most efficiently at cold side temperatures
between a minimum of 12C and maximum of 35°C. Operation with higher cold
side inlet temperature is possible, however must be engineered in consultation
with Rheem. The efficiency of the water heater is relative to the building chilled
water circuit temperature and the incoming hot side (potable) water temperature.
Automatic safety controls are fitted to the water heater to provide safe and
efficient operation.
FREEZE PROTECTION
Ice may begin to form in the evaporator when the cold side outlet temperature
falls below 4°C or the flow rate of cold side water is excessively low or the pump
on the cold side fails, and this may damage the evaporator heat exchanger.
HOW YOUR WATER HEATER WORKS
9
To prevent this damage, the pumps for
both sides of the water heater are sized
and supplied by Rheem and the heat
pump is supplied with a flow switch
sensor and a low temperature cut out
switch. The heat pump will terminate its
operation if poor flow rate is sensed or
the cold side outlet temperature or hot
side outlet temperature falls below
5°C.
AUXILIARY BOOST OPERATION
There are two types of auxiliary boost operation, which operate as follows:
ANTIFREEZE AUXILIARY BOOST OPERATION
When freeze protection activates, the heat pump will cease operating. It is then
possible to activate auxiliary heating mode.
In auxiliary heating mode the controller deactivates the heat pump and switches
to an auxiliary gas or electric water heater, if installed and activated in the menu.
A pump circulates water from the storage tanks through the auxiliary water heater
until the set temperature is reached.
When the cold side outlet temperature and hot side outlet temperature rises to
10°C, the auxiliary heating mode is deactivated and the heat pump starts
operating again.
For installations using multiple heat pumps in a master/slave configuration,
activation of antifreeze auxiliary boost operation on any heat pump activates the
auxiliary boost on all LAN connected heat pumps.
BACKUP AUXILIARY BOOST OPERATION
If the heat pump is in fault mode, the controller switches to an auxiliary gas or
electric water heater, if installed and activated in the menu. A pump circulates
water from the storage tanks through the auxiliary water heater until the set
temperature is reached.
HOW YOUR WATER HEATER WORKS
10
For multiple heat pump (Master/Slave) configuration, the auxiliary booster will
operate instead of the heat pumps if fifty percent (50%) or more heat pumps are
in fault.
For installations using multiple heat pumps in a master/slave configuration;
activation of backup auxiliary boost operation on any heat pump activates the
auxiliary boost on all LAN connected heat pumps.
The auxiliary boost should be set to 60°C.
The auxiliary boost will remain active until the water heater fault is cleared.
Warning: Rheem will not be responsible for higher utility bills due to
excessive use of auxiliary boost heater. It is the customers’ responsibly
to monitor the system regularly for its correct operation. Rheem
recommends monitoring via BMS (modules supplied separately).
MAINS PRESSURE
The 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 on page 21, a pressure limiting valve must be fitted.
THERMAL CUT OUT
The refrigeration circuit is protected by thermal sensors. These will activate a
thermal cut out in the event of excessive heat in the refrigeration system.
If the thermal cut out has activated, the heat pump will not operate for a period
of 20 minutes to 2 hours. The water heater will make two more attempts to start
up. If the thermal cut out is tripped again after the third attempt, the system will
enter lock out and the alarm contacts will close. If connected to a BMS, this will
alert the user that the unit is not operating.
The lockout condition can be manually reset by switching the power to the water
heater off and then on.
CONTROL FUNCTIONALITY
A timer can be set through the heat pump control panel to limit the hours of
operation of the water heater (e.g. to reduce noise at night).
The operation of the heat pump can also be controlled by setting up tariff option
on the control panel to manage operating costs.
HOW YOUR WATER HEATER WORKS
11
Note: depending on the booster configuration there may be insufficient stored
energy available for the next peak period if the system is not up to temperature.
SUPERIOR MONITORING
The W2W Heat Pump System is supplied with 11 sensors:
1. Tank temperature sensor
2. Building flow temperature sensor
3. Chilled water inlet temperature sensor
4. Chilled water outlet temperature sensor
5. Hot water inlet temperature sensor
6. Hot water outlet temperature sensor
7. Refrigerant suction side temperature (superheat)
8. Suction pressure transducer
9. Discharge pressure transducer
10. Cold water flow switch
11. Low temperature cut out switch
The output of these sensors are displayed on the user friendly control panel to
ensure correct system operation.
The system can be connected to BMS via interface cards (Modbus RS485 or
BACnet MS-TP or BACnet Ethernet) supplied by Rheem. Contact Rheem for
further information on BMS.
12
REGULAR CARE
It is suggested that the commercial heat pump be serviced annually, to
retain optimum performance. Servicing must be performed by a suitably
qualified person.
Annual Service
1. Check for leaks at all fittings.
2. Check for signs of excessive corrosion on storage tank(s) jacket(s) and heat
pump casing.
3. Check for sludge build up and if necessary drain and flush storage tank(s).
4. Clear hot water pump impellor and ensure free rotation.
5. Clear cold water pump impellor and ensure free rotation.
6. Check condensate drain for blockages – clear if necessary.
7. Isolate power to heat pump and check all electrical connections for signs of
overheating due to poor connection.
8. Check for vibration or excessive noise from compressor and hot and cold
water pumps.
9. Check refrigerant pressures and adjust refrigerant charge if required.
Visually check system for any potential problems.
10. Confirm correct system operation.
Five Year Service
1. As per annual service.
2. Inspect and if required, replace storage tank anode(s). If the anode is not
replaced, it should be replaced within three years of this service.
3. Replace temperature and pressure relief valve or expansion control valve.
Refer to Service manual for more information.
REGULAR CARE
13
TEMPERATURE AND PRESSURE RELIEF VALVE AND EXPANSION
CONTROL VALVE
A temperature and pressure relief valve is supplied with the storage tanks. In
many areas, including South Australia, Western Australia and scaling water
areas, an expansion control valve is also fitted to the cold water line to the water
heater system. The expansion control valve may discharge a small quantity of
water from its drain line during the heating period instead of the temperature
pressure relief valve on the storage tanks.
Operate the easing lever on the temperature and pressure relief valve and
expansion control valve once every six months. It is very important you raise
and lower the lever gently.
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 do this may result in the water heater heat exchanger
failing.
If water does not flow freely from the drain line when the lever is lifted, then the
water heater must be checked Phone Rheem Service or their nearest Accredited
Service Agent (or Service Centre in NZ) to arrange for an inspection.
The temperature and pressure relief and expansion control valve should be
replaced at intervals not exceeding 5 years, or more frequently in areas where
there is a high incidence of water deposits (refer to “Water Supplies” on page 14)
14
WATER SUPPLIES
This water heater must be installed in accordance with this advice to be
covered by the Rheem warranty. This advice relates to the cold water side
and hot water side of the heat pump water heater.
This water heater is manufactured to suit the water conditions of most public
reticulated water supplies. However, there are some known water chemistries
which can have detrimental effects on the water heater and its operation and / or
life expectancy. If you are unsure of your water chemistry, you may be able to
obtain information from your local water supply authority. This water heater
should only be connected to a water supply which complies with these guidelines
for the Rheem’s warranty to apply.
CHANGE OF WATER SUPPLY
The changing or alternating from one water supply to another can have a
detrimental effect on the operation and / or life expectation of a number of
components in this water heater.
Where there is a changeover from one water supply to another, e.g. a rainwater
tank supply, bore water supply, desalinated water supply, public reticulated water
supply or water brought in from another supply, then water chemistry information
should be sought from the supplier or it should be tested to ensure the water
supply meets the requirements given in these guidelines for the Rheem warranty
to apply.
SATURATION INDEX
The saturation index (SI) is used as a measure of the water’s corrosive or scaling
properties.
Where the saturation index is less than –1.0, the water is very corrosive and the
Rheem warranty does not apply to the water heater. In a corrosive water supply,
the water can attack copper parts and cause them to fail.
Where the saturation index exceeds +0.40, the water is very scaling and an
expansion control valve* must be fitted on the cold water line after the non-return
valve. The Rheem warranty does not apply to the water heater.
Water which is scaling may be treated with a water softening device to reduce
the saturation index of the water.
Refer to the cold water connection detail on page 38.
CHLORIDE AND PH
Where the chloride level exceeds 250 mg/L the Rheem warranty does not apply
to the water heater. In a high chloride water supply, the water can corrode
stainless steel parts and cause them to fail.
WATER SUPPLIES
15
Where the pH is less than 6.0 the Rheem warranty does not apply to the water
heater. pH is a measure of whether the water is alkaline or acid. In an acidic
water supply, the water can attack stainless steel parts and cause them to fail.
Water with a pH less than 6.0 may be treated to raise the pH. The water supply
from a rainwater tank in a metropolitan area is likely to be corrosive due to the
dissolution of atmospheric contaminants.
SUMMARY OF WATER CHEMISTRY ADVICE AFFECTING THE RHEEM
WARRANTY
The water heater is not suitable for certain water chemistries. Those chemistries
are listed below. If the water heater is connected at any time to a water supply
with the following water chemistry, Rheem's warranty will not cover any resultant
faults:
Water Chemistry
Component
Saturation Index (SI) < -1.0
water heater
Saturation Index (SI) > +0.4
water heater
Chloride > 250 mg/L
water heater
pH < 6.0
water heater
16
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for
attending to any condition or fault that is not related to manufacture or failure of
a part.
NOT ENOUGH HOT WATER (OR NO HOT WATER)
Is the electricity switched on?
Inspect the isolating switch marked “HOT WATER” or “WATER HEATER” at
the switchboard and the isolating switch at the water heater and ensure they
are turned on.
Check the circuit breaker marked “HOT WATER” or “WATER HEATER” at
the switchboard.
Is the alarm light flashing RED on heat pump controller?
If the alarm light is flashing RED, check the alarm by pressing the alarm
button. Phone your nearest Rheem Service Department or Acc redited
Service Agent (or Service Centre in NZ) to inform about the alarm.
Is the timer set?
If the timer has been set, ensure sufficient time has been allowed to reheat
the storage tanks.
Are you using more hot water than you think?
Are outlets (especially the showers)
using more hot water than you think?
Very often it is not realised the
amount of hot water used,
particularly when showering.
Carefully review the hot water usage.
Have your plumber install a flow
control valve to each shower outlet to
reduce water usage.
Heat pump circulator has failed?
The heat pump will not operate if the heat pump circulator has failed. Refer
to “Heat Pump Is Not Operating” on page 17 . Phone your nearest Rheem
Service Department or Accredited Service Agent to arrange for an inspection.
17
Water heater size
Do you have the correct size water heater for your requirements? The sizing
guide in the sales literature and on the Rheem website (www.rheem.com.au
or www.rheem.co.nz) suggest average sizes that may be needed.
WATER TOO HOT
The water heater, during both normal heat pump operation and auxiliary booster
operation (when freeze protection is activated, will heat the water to a
temperature of 60°C to 65°C. It is recommended to set the auxiliary booster
thermostat setting to 60°C.
WATER NOT HOT ENOUGH
You may find that due to heavy hot water usage the water temperature may be
lower than normally expected, due to insufficient heating time being allowed.
Additional storage or an in series booster may be required to be installed under
these circumstances.
HEAT PUMP IS NOT OPERATING
When freeze protection is activated– auxiliary boost mode
If the freeze protection activates, the heat pump will stop operating and the
auxiliary water heater, if installed, will operate instead. The total storage tank
capacity will be heated to 60°C during these periods. Heating of the water by
the heat pump will occur when the freeze protection deactivates.
Thermal cut out activated
Has the thermal cut out for the heat pump compressor activated?
If the thermal cut out has activated, the heat pump will not operate for a period
of 20 minutes to 2 hours and display alarm on the control panel. The water
heater will make two more attempts to start. If the thermal cut out is tripped
again after the third attempt, the system will enter lock out. If connected to a
BMS, this will alert the user that the unit is not operating.
To check whether there may be a problem, switch the power to the water
heater off and on again at the circuit breaker to the water heater, then open
a hot tap and allow to run for ten to fifteen minutes. The heat pump, if working
properly, will activate and continue operating to heat the water. Close the hot
tap when the heat pump begins to operate.
However, if the heat pump deactivates within five minutes, there may be a
problem. Phone your nearest Rheem Service Department or Accredited
Service Agent (or Service Centre in NZ) to arrange for an inspection.
18
Incorrect Phase Rotation
The phase fail relay will open circuit if the heat pump has been wired with
incorrect phase rotation or if a phase has failed. Both red and green LEDs on
the relay will be illuminated if all phases are available and phase rotation is
correct.
Heat pump circulator has failed
If the heat pump circulator has failed, the heat pump will not operate. Phone
your nearest Rheem Service Department or Accredited Service Agent (or
Service Centre in NZ) to arrange for an inspection.
HIGH ELECTRICITY BILLS
With the installation of your new water sourced heat pump water heater,
maximum electrical energy savings can be achieved. Should you at any time,
feel your energy account is too high, we suggest you check the following points:
Is the relief valve in the storage tanks running excessively?
Are outlets (especially the showers)
using more hot water than you think?
(Refer to “Not Enough Hot Water” on
page 16).
Is there a leaking hot water pipe,
dripping hot water tap, etc? Even a
small leak will waste a surprising
quantity of hot water and energy.
Replace faulty tap washers, and
have your plumber rectify any
leaking pipe work.
Consider recent changes to your hot
water usage pattern and check if
there has been any increase in tariffs
since your previous account.
The heat pump water heater operates at its most efficient at higher cold side
water temperatures. Prolonged periods of activation of freeze protection will
decrease the efficiency of the system and increase running costs.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU
NEED ASSISTANCE, CALL YOUR NEAREST RHEEM SERVICE
DEPARTMENT OR ACCREDITED SERVICE AGENT.
19
INSTALLATION
THIS WATER HEATER IS FOR INDOOR OR OUTDOOR INSTALLATION.
THIS WATER HEATER IS NOT SUITABLE FOR POOL HEATING.
INSTALLATION STANDARDS
The water heater must be installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS/NZS 3000 and all local
codes and regulatory authority requirements.
In New Zealand, the installation must also conform with Clause G12 of the New
Zealand Building Code.
WATER HEATER APPLICATION
This water heater is designed for the purpose of heating potable water by
simultaneously reducing building chilling load. Its use in an application other than
this may shorten its life
If this water heater is to be used where an uninterrupted hot water supply is
necessary for the application or business, then there should be 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 provide advice to the system owner about their
needs and building backup redundancy into the hot water supply system.
COMPONENTS
The heat pump water heater system is modular and comprises three main
components: the heat pump water heater, storage tanks, and primary circulators.
An auxiliary booster and circulator may also be employed as part of the system.
The water heater must not be operated until all components are assembled.
Do not tilt the heat pump more than 45° from the vertical. This will unsettle
the refrigerant gas and compressor lubricating oil. If the heat pump has been
tilted more than 45° from the vertical during handling, it will need one hour to
settle before the power to the water heater can be switched on, otherwise
damage to the compressor may result.
INDOOR INSTALLATION
To comply with AS1677.2, the minimum room size permissible is 5.6m3 per 15kW
heat pump and 15.34 m3 per 35kW heat pump.
INSTALLATION
20
WATER HEATER LOCATION
All models are designed to be installed outdoors or indoors, as long as the room
meets the volume requirements stated above.
It is advisable to install the water heater away from bedroom or living room
windows as the system can generate a noise of 59dBA (at 3 metres from the
water heater) whilst operating.
It is recommended the water heater be installed at ground or floor level. Stacked
units with base unit at ground or floor level is acceptable from a servicing
perspective.
The water heater must stand vertically upright.
Clearance must be allowed for servicing of the water heater. The water heater
must be accessible without the use of a ladder or scaffold.
You must be able to read the information on the rating plate. Remember you may
have to remove the entire water heater later for servicing.
A clearance of 850 mm is required from the side of water connections and the
front of the heat pump.
SAFE TRAY
Where damage to property can occur in the event of the water heater leaking or
condensate forming under the drain tray, the water heater must be installed in a
safe tray or be suitably bunded. Construction, installation and draining of a safe
tray must comply with AS/NZS 3500.4 and all local codes and regulatory
authority requirements.
INSTALLATION
21
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below,
an approved pressure limiting valve is required and should be fitted as shown in
the installation diagram (refer to diagram on page 38).
Relief valve setting (VE/610 Series storage tanks)
1000 kPa
Expansion control valve setting *
850 kPa
Relief valve setting (SS/RT Series storage tanks)
850kPa
Expansion control valve setting *
700 kPa
Max supply pressure (VE/610 Series storage tanks)
Without expansion control valve
800 kPa
With expansion control valve
680 kPa
Max supply pressure (SS/RT Series storage tanks)
Without expansion control valve
680 kPa
With expansion control valve
550 kPa
* Expansion control valve not supplied with the water heater.
TANK WATER SUPPLY
If the storage tank is supplied with water from a tank supply and a pressure pump
system is not installed, then the bottom of the supply tank must be at least 1 m
above the highest point of the hot water plumbing system, including the storage
tank. Care must be taken to avoid air locks. The cold water line to the storage
tank should be adequately sized and fitted with a full flow gate valve or ball valve.
HOT WATER DELIVERY
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted
between the storage tanks and the hot water outlets in any ablution area such
as a bathroom or ensuite, to reduce the risk of scalding. The installing plumber
may have a legal obligation to ensure the installation of this water heater system
meets the delivery water temperature requirements of AS/NZS 3500.4 so that
scalding water temperatures are not delivered to a bathroom, ensuite or other
ablution area.
Where a temperature limiting device is installed adjacent to the storage tanks,
the cold water line to the temperature limiting device can be branched off the
cold water line either before or after the isolation valve, pressure limiting valve
and non return valve to the water heater system. If an expansion control valve is
required, it must always be installed after the non return valve and be the last
valve prior to the storage tanks.
INSTALLATION
22
Two Temperature Zones Using a Temperature Limiting Device
If a pressure limiting valve is installed on the cold water line to the water heater
system and the cold water line to a temperature limiting device branches off
before this valve or from another cold water line in the premises, then a pressure
limiting valve of an equal pressure setting may be required prior to the
temperature limiting device.
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
This heat pump water heater may be installed as part of a circulated hot water
flow and return system in a building as long as a temperature boosting water
heater is not installed downstream of the heat pump.
If a temperature boosting water heater is installed the circulated hot water flow
and return system must return to the inlet of the temperature boosting water
heater, and not the heat pump, to avoid potential nuisance tripping.
Temperature Limiting Device
A temperature limiting device cannot be installed in circulated hot water flow and
return pipe work unless the device is designed for such application, such as
Rheem Guardian. The tempered water from a temperature limiting device cannot
be circulated. Where a circulated hot water flow and return system is required in
a building, a temperature limiting device can only be installed on a dead leg,
branching off the circulated hot water flow and return pipe.
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