Rheem 325 II Series Operating instructions

First Issued April 2014
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Rheem Australia Pty Ltd ABN 21 098 823 511
Solahart
Everhot
RheemPlus
Rheem
325HAV
251325
554325
451325
251410
554410
551325
551410
SERVICE INSTRUCTIONS
325 & 410 Series II Heat Pump
TM077
Revision: 00
Issued: April 2014

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
CONTENTS
INTRODUCTION .................................................................................................................3
SAFETY WARNING.............................................................................................................3
POWER SUPPLY................................................................................................................3
ENVIRONMENTAL..............................................................................................................3
HEAT PUMP WATER HEATER MODEL IDENTIFICATION ...............................................4
HEAT PUMP WATER HEATER MODELS ..........................................................................5
SPECIFICATIONS...............................................................................................................6
PREVENTATIVE MAINTENANCE ......................................................................................8
REFRIGERATION TERMS AND THEIR MEANING............................................................9
COMPONENTS AND THEIR FUNCTION ...........................................................................9
CONTROLLER..................................................................................................................11
Power and Tank Sensor Connections ........................................................................11
Sensors ......................................................................................................................11
Reset Button...............................................................................................................12
OPERATION......................................................................................................................13
Refrigerant High Pressure Switch...............................................................................17
LED STATUS CODES.......................................................................................................18
OPERATIONAL SEQUENCES..........................................................................................20
System Start-Up and Standby Mode ..........................................................................20
Faults..........................................................................................................................21
Heat Pump Mode........................................................................................................22
Element Mode –Ambient ...........................................................................................23
Element Mode –Fault.................................................................................................24
Fault 9 –Heating Disabled .........................................................................................25
WIRING DIAGRAM............................................................................................................26
REFRIGERATION SYSTEM DIAGRAM............................................................................27
COMMON COMPLAINTS..................................................................................................27
SERVICE TECHNICIAN‟S HEAT PUMP KIT.....................................................................29
FAULT FINDING................................................................................................................31
Sensors ......................................................................................................................48
Refrigerant Charge.....................................................................................................54
Electrical Insulation Testing........................................................................................55
COMPONENT REPLACEMENT PROCEDURES .............................................................56
Storage Tank..............................................................................................................56
Heat Pump Module.....................................................................................................62
Refrigeration System..................................................................................................66
DOCUMENT REVISION HISTORY...................................................................................76

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
INTRODUCTION
The information provided in these instructions is based on the water heater being installed
in accordance with AS/NZS 3500.4, AS/NZS 3000 and the Owner‟s Guide and Installation
Instructions booklet provided with each water heater.
Should you require further technical advice on a 325 or 410 Series II Heat Pump Water
Heater, contact your nearest Rheem Service Department where all genuine replacement
parts are also available.
SAFETY WARNING
The purpose of this Service Manual is to provide sufficient information to allow a person
with the skills as required by the controlling Regulatory Authorities to carry out effective
repairs to a 325 or 410 Series II Heat Pump Water Heater in the minimum amount of time.
Safety precautions or areas where extra care should be observed when conducting tests
outlined in this manual are indicated by print in bold italics and / or a warning symbol.
Take care to observe the recommended procedure.
General warning symbol. Observe the instructions accompanying the
symbol.
“Live” testing to be conducted. Personal Protective Clothing (PPE) shall
be worn to reduce the risk of electric shock. Refer to Rheem Safety
Procedure on electrical testing.
Isolate power before conducting the indicated test
Hot surface or liquid. Personal Protective Clothing (PPE) shall be worn to
reduce the risk of scalding.
WARNING: The heat pump must NEVER be operated with the refrigeration
system open to atmosphere.
POWER SUPPLY
325 & 410 Series II Heat Pumps will only operate on a sine wave at a
frequency of 50 Hz. Devices generating a square or saw tooth wave cannot
be used to supply power to the water heater.
ENVIRONMENTAL
R134a refrigerant is a controlled substance under the Ozone Protection
and Synthetic Greenhouse Gas Management Act. Only personnel qualified
and licensed to work with refrigerants may carry out service and repair
work on the sealed refrigeration system. During repair the refrigerant must
always be recovered, never vented to the atmosphere.
At the end of the service life of a Rheem heat pump, the refrigerant must
be recovered by personnel qualified and licensed to work with refrigerants
prior to the unit being disposed of. Refrigerants must not be vented to
atmosphere.

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
HEAT PUMP WATER HEATER MODEL IDENTIFICATION
All identification numbers are designed to convey detailed information about the water
heater to which it is attached. Model number, serial number and date of manufacture
should be quoted in all correspondence.
Rheem / Everhot Model Identification
5
5
1
325
07
2 –Everhot
4 –Rheem Optima
5 –Rheem
5 –Integrated
6 –Split
1 –Booster Element
4 –Booster Element and RheemPlus
Storage Capacity in Litres
04 –1800 watt element
05 –2400 watt element
07 –3600 watt element
Solahart Model Identification
325
H
A
V
36
Storage Capacity in Litres
H –Heat Pump
A –Air Sourced
V –Warranty Code *
24 –2400 watt element
36 –3600 watt element
* For details refer to the product‟s Owner‟s Guide.

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
AquaMax Model Identification
Note: The 325 & 410 Series II Heat Pump module is not manufactured under the AquaMax brand,
however another brand module may be fitted to an existing AquaMax storage tank.
HP
325
-
36
-
1
B
HP –Heat Pump
Storage Capacity in Litres
36 –3600 watt element
1 –Number of Heat Pump Modules
B –Heat Pump Module B (AQ9290000)
HEAT PUMP WATER HEATER MODELS
The 325 & 410 Series II Heat Pump consists of a storage tank and a heat pump module,
which combine to make up the complete heat pump water heater.
The table below details the model numbers of the storage tanks and heat pump modules
that comprise each model of heat pump water heater.
“xx”indicates the booster element capacity:
04 or 18 = 1.8kW
05 or 24 = 2.4kW
07 or 36 = 3.6kW
Brand
Model
Storage Tank
Heat Pump
Module
Rheem
551325xx
=
T551325xx
+
182550
551410xx
T551410xx
Rheem Optima
451325xx
T451325xx
RheemPlus
554325xx
T554325xx
554410xx
T554410xx
Everhot
251325xx
=
T251325xx
+
182553
251410xx
T251410xx
Solahart
325HAVxx
=
T325HAVxx
+
182541

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
SPECIFICATIONS
Storage Tank
Parameter
Model
T5514101
T5544101, 3
T2514101
T451325
T551325
T5543253
T251325
T325HAV
HP325S36
Capacity (Litres)
410
325
325
325
Boost Capacity (Litres)
2002
1802
100 / 1802
206
Booster Element Rating (kW)
2.4 / 3.6
1.8 / 2.4 / 3.6
1.8 / 2.4 / 3.6
3.6
T&PR Valve Rating (kPa)
1000
1000
1000
1000
Maximum Inlet Water
Pressure (kPa)
With ECV
680
680
680
650
Without ECV
800
800
800
850
Water Connections
Inlet / Outlet
Rp ¾” (20mm)
Rp ¾” (20mm)
Rp ¾” (20mm)
Rp ¾” (20mm)
Heat Pump
Rp ½” (15mm)
Rp ½” (15mm)
Rp ½” (15mm)
Rp ½” (15mm)
T&PR
Rp ½” (15mm)
Rp ½” (15mm)
Rp ½” (15mm)
Rp ¾” (20mm)
Anode
Quantity
1
1
1
1
Length (mm)
1596
1340
1370
1480
Booster Element Thermostat Setting
(Fixed)
70ºC
70ºC
70ºC
70ºC
Booster Element ECO Setting
85ºC
85ºC
85ºC
84ºC
1410L model for use in QLD only.
2Boost volume with droopy element fitted –droopy element available in 2.4kW and 3.6kW only.
3RheemPlus models have the mains terminal block and earth connection on the opposite side of the tank to the heat pump module. RheemPlus
models therefore have three electrical covers on the storage tank.

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Heat Pump Module
Parameter
Model
182550 / 182553 / 182541
Superheat Setting (Factory)
6K at 10ºC saturated suction temperature
Refrigerant Type
R134a
Refrigerant Charge
375 grams
Refrigerant High Pressure Switch
Cut Out:
Manual Reset Pressure:
2930kPa (± 103kPa)
2241kPa (± 207kPa)
Compressor Capacitor
25 µF +10/–5%, 370/440V AC, 50/60Hz
Compressor Current Draw
3.3A
Compressor Internal Overload Setting
(Automatic Reset)
Cut Out:
Cut In:
150°C
90°C
Compressor Winding Resistance
Run Winding –Red & Blue:
Start Winding –Red & Black:
4.18Ω at 20ºC
5.76Ω at 20ºC
Compressor Switching Relay
Type:
Coil Voltage:
Coil Resistance:
Omron
240V AC
30.51kΩ at 20ºC
Fan Capacitor
1.5µF ± 5%
Fan Winding Resistance
Run Winding –Blue & Black:
Start Winding –Blue & Brown:
650Ω at 20ºC
375Ω at 20ºC
Circulator Winding Resistance
on Speed Setting 1
602Ω at 20ºC
Circulator Capacitor
1.5µF +2/–5%
Circulator Speed Setting
1

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
PREVENTATIVE MAINTENANCE
It is suggested that the water heater be serviced annually, to retain optimum
performance.
Annual Service
Check for discharge from the T&PR valve. When the heat pump or element is
operating a small discharge of water may be evident. Operate the valve, easing the
lever to ensure the valve opens and reseats properly. Always open and close the
valve gently.
Check for leaks at all fittings.
Check for signs of excessive corrosion on the water heater and heat pump jackets.
Check for sludge build up and if necessary drain and flush tank.
Clear the circulator impellor & ensure free rotation.
Clean the condensate tray and check the condensate drain for blockages –clear if
necessary.
RheemPlus models: Service the tempering valve, refer to page 61.
Clean blockages and debris from evaporator fins, fan blades, grilles and louvers.
Isolate power to the water heater and check all electrical connections for signs of
overheating due to poor connection.
Conduct an 'Electrical Insulation Test' on the water heater, refer to pages 40 and 55.
Check for vibration or excess noise from the compressor, fan and circulator.
Check the refrigerant charge by inspecting the sight glass.
Visually check the unit for any potential problems.
Confirm correct heat pump module operation.
Five Year Service
Replace the T&PR valve.
Inspect and flush the expansion control valve (if fitted). If required, replace the valve.
Inspect and if required, replace the anode.
If the anode is not replaced, it should be replaced within three years of this service.
Check the heating element for excessive calcium build up or corrosion and replace if
necessary.
Check for leaks at all fittings.
Check for signs of excessive corrosion on the water heater and heat pump jackets.
Check for sludge build up and if necessary drain and flush tank.
Clear the circulator impellor & ensure free rotation.
Clean the condensate tray and check the condensate drain for blockages –clear if
necessary.
RheemPlus models: Service the tempering valve, refer to page 61.
Clean blockages and debris from evaporator fins, fan blades, grilles and louvers.
Isolate power to the water heater and check all electrical connections for signs of
overheating due to poor connection.
Conduct an 'Electrical Insulation Test' on the water heater, refer to pages 40 and 55.
Check for vibration or excess noise from the compressor, fan and circulator.
Check the refrigerant charge by inspecting the sight glass.
Visually check the unit for any potential problems.
Confirm correct heat pump module operation.

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
REFRIGERATION TERMS AND THEIR MEANING
Condense –The action of a substance as it releases heat and changes state from a
vapour (gas) to a liquid.
Evaporate –The action of a substance as it absorbs heat and changes state from a liquid
to a vapour (gas).
Heat of Compression –The heat energy added to a substance by the act of compressing
it.
High Side –Components and pipework of a refrigeration system operating at high
pressure, generally the compressor case where a rotary compressor is utilised, discharge
line, condenser, liquid line, liquid receiver where utilised and filter drier.
Latent Heat –The „hidden‟ heat energy that causes a change in state of a substance,
without changing its temperature.
Low Side –Components and pipework of a refrigeration system operating at low
pressure, generally the evaporator, suction line and suction accumulator.
Saturated Liquid –A liquid at the point that it will boil with any increase in temperature, at
a given pressure.
Saturated Vapour –A vapour at the point that it will condense with any decrease in
temperature, at a given pressure.
Subcooled Liquid –A liquid at a temperature below its saturation point, at a given
pressure.
Superheated Vapour –A vapour (gas) at a temperature above its saturation point, at a
given pressure.
COMPONENTS AND THEIR FUNCTION
Anode (Sacrificial) –A metal alloy electrode installed in the water heater cylinder that
protects the cylinder from corrosion by galvanic action.
Compressor –An electromechanical device that increases the pressure of superheated
refrigerant vapour by decreasing its volume, as well as increasing its temperature due to
the addition of the heat of compression. The increase in pressure causes the refrigerant to
circulate through the refrigeration system.
Condenser –A heat exchanger containing three chambers; one for the refrigerant, one for
water and a third separating chamber which is open to atmosphere. The refrigerant enters
the condenser as a high pressure, high temperature superheated refrigerant vapour and
gives off its heat. This heat is absorbed by the water from the storage tank which is being
circulated through the water chamber in the condenser. As the refrigerant gives off its heat
and becomes cooler, it condenses (changes state) to a saturated liquid. Cooling of the
saturated liquid refrigerant continues such that it becomes subcooled.
Diffuser –A plastic device installed in the cold water inlet of the water heater cylinder to
assist with stratification. It also acts as a fitting liner.
Discharge Check Valve –A valve in the refrigerant discharge line that allows refrigerant
to move in one direction only. The valve prevents refrigerant migrating back into the
compressor when the refrigeration system is not operating.

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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Evaporator –An aluminium finned copper coil where the low pressure, low temperature
refrigerant absorbs heat from the surrounding ambient air. As the refrigerant absorbs heat
and becomes warmer, it evaporates (changes state) to a saturated vapour. Heating of the
saturated refrigerant vapour continues such that it becomes superheated.
Filter Drier –A component fitted in the refrigerant liquid line. The filter drier traps
impurities and removes moisture from the sealed refrigeration system.
Fitting Liner –A plastic tube installed in the cold water inlet of the storage tank to provide
protection against corrosion through the life of the water heater.
Heating Element –A tubular device containing a resistive element, that converts electrical
energy to heat.
Outlet Delivery Tube (Dip Tube) –A plastic tube installed in the hot water outlet of the
water heater cylinder to conduct water from the highest point to the outlet connection. It
also acts as a fitting liner.
Pressure Limiting Valve (PLV) –A valve that controls its outlet pressure to a
predetermined limit.
Process Tube –A short piece of copper pipework used for charging refrigerant into the
refrigeration system during manufacture.
Refrigerant High Pressure Switch –A pressure switch in the refrigerant discharge line
that opens when the refrigerant discharge pressure exceeds the switch rating.
Sensor –A device which changes resistance with a change in temperature, also known as
a thermistor. Sensors are used to measure temperature and feed the information back to a
control system.
Sight Glass –A component fitted in the refrigerant liquid line. The sight glass allows the
state (liquid/vapour) of the passing refrigerant to be observed, and includes a moisture
indicator.
Suction Accumulator –A device fitted in the refrigerant suction line, which accumulates
and prevents any liquid refrigerant from entering and damaging the compressor. Any liquid
refrigerant in the suction accumulator is evaporated or “boiled off” to a vapour.
Temperature and Pressure Relief (T&PR) Valve –A valve designed to provide
automatic relief by discharging water in case of excessive temperature, pressure or both.
Never fit a T&PR Valve with a pressure rating greater than that indicated on
the product rating label.
Thermal Cut Out (ECO) –A manually reset temperature sensitive device mounted
against the water heater cylinder, which cuts off the supply of electrical energy.
Thermostat –A temperature sensitive device mounted against the water heater cylinder,
which controls the supply of electrical energy to maintain the stored water at the required
temperature.
Thermostatic Expansion (TX) Valve –A mechanical valve that expands the liquid
refrigerant to a lower pressure as it moves through the TX valve‟s orifice. The expansion
process also lowers the temperature of the refrigerant, to a point below that of the
surrounding ambient air. The TX valve has a bulb that senses the temperature of the
suction line at the evaporator outlet. The TX valve thermostatically meters the flow of
expanding refrigerant to the evaporator, in response to the temperature of the suction line
as measured by the bulb.