Rheem 310 Series Operating instructions

First Issued March 2007
This document is stored and maintained electronically by Technical Support. All printed copies are deemed uncontrolled.
Rheem Australia Pty Ltd ABN 21 098 823 511
SERVICE INSTRUCTIONS
310 Series Heat Pump
TM025
Revision: AF
Issued: March 2016
Rheem
551310
Everhot
251310
Solahart
310HAV
Edwards
40467791

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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
CONTENTS
INTRODUCTION .................................................................................................................3
SAFETY WARNING.............................................................................................................3
POWER SUPPLY................................................................................................................3
ENVIRONMENTAL..............................................................................................................3
HEATER MODEL IDENTIFICATION...................................................................................4
HEAT PUMP WATER HEATER MODELS ..........................................................................5
SPECIFICATIONS...............................................................................................................6
PREVENTATIVE MAINTENANCE ......................................................................................7
PRODUCT CHANGES ........................................................................................................8
REFRIGERATION TERMS AND THEIR MEANING..........................................................10
COMPONENTS AND THEIR FUNCTION .........................................................................11
CONTROLLER..................................................................................................................13
Power and Sensor Strip Connections.............................................................................13
Printed Circuit Board (PCB) ...........................................................................................14
Sensor Strip ...................................................................................................................14
Sensors..........................................................................................................................15
AUTOMATIC AIR ELIMINATOR........................................................................................15
OPERATION......................................................................................................................16
LED STATUS CODES.......................................................................................................24
OPERATIONAL SEQUENCES..........................................................................................25
Standby Mode and Heat Pump Mode ............................................................................25
Faults .............................................................................................................................28
Element Mode................................................................................................................30
WIRING DIAGRAMS .........................................................................................................32
Models manufactured from 31/03/16 (or fitted with a Grundfos Circ Kit from 04/16)......32
Models manufactured from 8/08/13 - 03/16 (or Grundfos Kit fitted during same range).33
Models manufactured from 14/08/2007 –7/08/2013 (Salmson Circulator) ....................34
Models manufactured prior to 14/08/2007 (Salmson Circulator) ....................................35
REFRIGERATION SYSTEM DIAGRAM............................................................................36
COMMON COMPLAINTS..................................................................................................36
SERVICE TECHNICIAN’S HEAT PUMP KIT.....................................................................38
SENSOR STRIP TESTER.................................................................................................39
FAULT FINDING................................................................................................................40
Sensor Strip and Sensor Strip Replacement Kit.............................................................70
Sensors..........................................................................................................................71
Refrigerant Charge.........................................................................................................81
Electrical Insulation Testing............................................................................................81
COMPONENT REPLACEMENT PROCEDURES .............................................................82
Storage Tank..................................................................................................................82
Heat Pump Module.........................................................................................................85
Refrigeration System......................................................................................................90
DOCUMENT REVISION HISTORY...................................................................................98

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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
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 310 Series Heat Pump Water Heater
contact Rheem Technical Support.
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 310 Series 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
310 Series 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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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
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
310
07
2 –Everhot
5 –Rheem
5 –Integrated
1 –Booster Element
310 - Storage Capacity in Litres
04 –1800 watt element
05 –2400 watt element
07 –3600 watt element
Solahart Model Identification
310
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.
Edwards Model Identification
40
46
77
91
29
40 –Heat Pump
46 –310L Storage Capacity
77 –Joey Grey Colour
91 –With Heat Pump Module
28 –2400 watt element
29 –3600 watt element

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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
HEAT PUMP WATER HEATER MODELS
The 310 Series 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 = 1.8kW
05 or 24 or 28 = 2.4kW
07 or 36 or 29 = 3.6kW
Brand
Model
Storage Tank
Heat Pump
Module
Rheem
551310xx
=
T551310xx
+
180532
Everhot
251310xx
=
T251310xx
+
180552
Solahart
310HAVxx
=
T310HAVxx
+
180533
Edwards
40467791xx
=
40467700xx
+
4000770009

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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
SPECIFICATIONS
Storage Tank
Parameter
Model
551310
251310
310HAV
40467791
Capacity (Litres)
310
310
Boost Mode Capacity (Litres)
220
220
Limp Mode Capacity (Litres)
111
111
Booster Element Rating (kW)
1.8 / 2.4 / 3.6
2.4 / 3.6
T&PR Valve Rating (kPa)
1000
1000
Maximum Inlet Water
Pressure (kPa)
With ECV
680
680
Without ECV
800
800
Water Connections
Inlet / Outlet
Rp ¾” (20mm)
Rp ¾” (20mm)
Heat Pump
Rp ½” (15mm)
Rp ½” (15mm)
T&PR
Rp ½” (15mm)
Rp ½” (15mm)
Anode
Quantity
1
1
Length
1153
1153
Booster Element Controller Thermostat Setting
(Fixed)
62°C
62°C
Booster Element Mechanical Thermostat Setting
(Fixed)
70°C
70°C
Booster Element ECO Setting
88°C
88°C
Heat Pump Module
Parameter
180532 / 180552 / 180533 / 4000770009
Superheat Setting (Factory)
6K at 10ºC saturated suction temperature
Refrigerant Type / Charge
R134a / 1050 grams
Compressor Capacitor
35 µF +10/–5%, 370/440V AC, 50/60Hz
Compressor Current Draw
6.4A
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:
2.2Ω at 20ºC
3.3Ω at 20ºC
High Pressure Switch1
Cut out: 2930kPa (+/- 100kPa)
Manual reset to close < 2240kPa (+/- 200kPa)
Fan Capacitor
2µF, 450V AC, 50/60Hz
Fan Winding Resistance
Run Winding –Black & Brown:
Start winding –Black & Blue:
184Ω at 20ºC
238Ω at 20ºC
Salmson Circulator Winding
Resistance
75.3Ω at 20ºC
Grundfos Circulator Winding
Resistance on Speed Setting 1
602Ω at 20ºC
Grundfos Circulator Capacitor
1.5µF +2/–5%
Grundfos Circulator Speed Setting
1
1HPS only applicable to models produced from 31/03/2016

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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
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.
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 page 81.
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.
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 page 81.
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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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
PRODUCT CHANGES
STORAGE TANK
Thermostat: Storage tanks manufactured from 14/08/2007 have an ST type thermostat in
place of the EWT type thermostat. The new ST thermostat is part number 052017, and the
storage tank wiring is revised to suit the new thermostat. The revised wiring diagram may
be found on page 34.
Double Sensor Strip: Storage tanks manufactured from 31/10/2007 have a double sensor
strip in place of the single sensor strip. Only one sensor strip is utilised for operation, the
second sensor strip is provided for redundancy in the event that the first sensor strip fails.
If the sensor strip in service fails and the spare sensor strip is plugged in, the plug must be
cut off the failed sensor strip so it is functionally and visibly disabled and can’t be
inadvertently re-used.
Sensor Strip Replacement Kit: An externally retrofittable sensor strip field kit is available,
for use in the event that both sensor strips have failed. The Sensor Strip Replacement Kit
is Rheem part number 299306.
Hot Water Return Diffuser: Storage tanks manufactured from 8/08/2013 have a diffuser
and new seal on the hot water return fitting. The diffuser and seal replace the short
dropper tube and dropper tube seal. The diffuser improves temperature stratification in the
storage tank.
Obsolete Models: Everhot, Solahart & Edwards branded models are no longer available.
Rheem branded product is compatible and is to be used if replacement is required.
HEAT PUMP MODULE
TX Valve: Heat pump modules manufactured from May 2007 have a TX valve with a brass
body. Heat pump modules manufactured prior to this time have a TX valve with a stainless
steel body. The superheat setting on both valve types is the same.
Automatic Air Eliminator: Heat pump modules manufactured from 14/05/2009 have an
automatic air eliminator installed between the outlet of the circulator and the heat
exchanger. The automatic air eliminator purges any potential air locks which may occur
upon initial installation or after servicing.
The Automatic Air Eliminator is also available in kit form, for retrofitting to models
manufactured prior to 14/05/2009. The Automatic Air Eliminator Kit is Rheem part number
290142.
NOTE: 310 Series Heat Pumps require a minimum supply water pressure of
200kPa to operate correctly. Fitment of this kit will NOT overcome operational
problems where the supply water pressure is not maintained at 200kPa or higher.
Vermin Shield Kit: A retrofittable vermin shield kit is available, for use in the event that
vermin are entering and damaging the heat pump module controller. The vermin shield is
fitted to controller chassis and works in conjunction with the controller cover. The Vermin
Shield Kit is Rheem part number 294008.
Service Valves: Heat pump modules manufactured from 2/02/2011 have suction and
discharge Schrader valves fitted to the refrigeration system.
Evaporator Sensor & Clip: Heat pump modules manufactured from 17/05/2011 have a
revised evaporator sensor and clip. The evaporator sensor is changed to Rheem part
number 056023 and has a dedicated clip, Rheem part number 056022. The new

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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
evaporator sensor has the same temperature / resistance relationship as the other heat
pump module sensors.
Start Temperatures: Heat pump modules manufactured from 16/10/2012 have the
temperatures at which heat pump heating is started modified in the controller firmware.
The start heating temperatures have been changed from S3 < 50°C or S4 < 44.5°C, to S3
< 49°C or S4 < 43°C.
Grundfos Circulator and Heat Pump Module Upgrade: Heat pump modules
manufactured from 8/08/2013 (from serial number 2HP0000019) utilise a Grundfos
circulator and contain a number of design improvements. The full scope of changes
includes the following:
Grundfos circulator
Addition of water circuit check valve
Revised controller
oAddition of plugged fan connection
oRevised circulator connection
oRevised firmware
Addition of LED status codes
Addition of Freeze Protection Mode
Addition of compressor start delay
Revised circulator speed control algorithm
Revised controller cover
Addition of operating status LED panel
Revised heat exchanger water inlet and outlet sensors
Addition of protection to flexible hoses to prevent damage from rubbing
A retrofittable kit is available which allows existing installed heaters to be upgraded
to include the same improvements incorporated into models manufactured from
8/08/2013.
The kit, known as the Grundfos Circulator Kit is Rheem part number 290604.
NOTE:
The Grundfos circulator, controller and temperature sensors in the kit MUST
be fitted together. The kit comprises a system and requires that all of the
components are installed. The Grundfos circulator, controller and
temperature sensors are interdependent and failure to install all of the
components in the kit will result in malfunction of the water heater.
The Automatic Air Eliminator Kit (290142) must be fitted prior to fitting the
Grundfos Circulator Kit (290604).
Suction Line: Heat pump modules manufactured from 3/12/2013 (from serial number
1HP0003203) have a revised suction line.
Suction Line Brace: Heat pump modules manufactured from 1/04/2014 have a brace
added to the evaporator coil. The brace is mounted to the evaporator coil end plate and
the suction line is secured to the brace. The brace secures the suction line to prevent
excess movement, which may result in line breakage in the event of rapid power cycling to
the compressor due to the failure of an electronic component.
WARNING: The suction line brace MUST be fitted whenever the heat pump
is in operation.

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TM025: 310 Series Heat Pump Service Instructions
Rev AF: Issued March 2016
Addition of High Pressure Switch: Heat pump modules manufactured from 31/03/2016
have a high pressure switch (HPS) fitted to provide additional high pressure protection.
The HPS is fitted in the liquid line between the condenser and the drier and will trip (open
circuit) in the event of an over-pressure situation. A trip of the high pressure switch will
result in the following:
Compressor ceases operation
Element heating enabled
Fan continues to operate
Pump continues to operate
Flashing red LED displayed (4 or 5 flashes depending on external conditions)
Green LED off
A tripped high pressure switch will be required to be manually reset before the heat pump
will attempt to resume normal operation. Until the HPS is reset the heater will operate in
element mode with fan and pump continually running during the heating cycle.
The existing HDi controller (part number 051728) is now
obsolete and is replaced with a revised HDi controller (part
number 051738) which has an additional plug jack to
accommodate the HPS. This revised controller can be used
on all HDi models, including earlier models that do not have a
HPS fitted. A HPS bypass plug (part number 051733) has
been developed for use on earlier models that do not have
HPS fitted.
A service kit (part number 299279) consisting of a HPS
bypass plug, replacement HDi controller and an instruction
sheet is available from Spare Parts.
The Grundfos Circulator Retrofit Kit (part number 290604) is
also modified to include this revised HDi controller and HPS
bypass plug.
Obsolete Models: Everhot, Solahart & Edwards branded modules are no longer available.
Rheem branded product is compatible and is to be used if replacement is required.
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.
HIGH PRESSURE
SWITCH JACK
Bypass
Plug