Rheem Gas Heavy Duty Water Heater Models 265 Litre and 275 Litre Specifications

Rheem Australia Pty Ltd
ABN 21 098 823 511
SERVICE INSTRUCTIONS
H.S.I Heavy Duty Gas
TM011
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621265
631265
621275
631275
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Contents
Safety Warning ....................................................................................................................2
Introduction ..........................................................................................................................2
Heater Model Identification ..................................................................................................2
Specifications.......................................................................................................................3
Preventative Maintenance ...................................................................................................3
Lighting Instructions .............................................................................................................4
Operation .............................................................................................................................4
Wiring Diagram 621265 / 631265 ........................................................................................9
Wiring Diagram 621275 .....................................................................................................10
Wiring Diagram 631275 - Manufactured Before 09/02/05..................................................11
Wiring Diagram 631275 - Manufactured After 09/02/05.....................................................12
Components and their Function.........................................................................................13
Product Changes ...............................................................................................................14
Common Faults .................................................................................................................16
Fault Finding - Chart 1 .......................................................................................................19
Fault Finding - Chart 2 .......................................................................................................22
Electronic Thermostat ........................................................................................................24
Electronic Thermostat Diagnosis ...................................................................................25
Electronic Thermostat Adjustment .................................................................................25
Temperature Sensor Set................................................................................................29
Fault Finding – Chart 3 ..................................................................................................30
Ignition Module ..................................................................................................................31
Flue Damper - 621275 ONLY ............................................................................................39
Flue Damper Fault Finding - Chart 8..............................................................................40
Flue Damper Fault Finding - Chart 9..............................................................................42
Flue Damper - Bypass ...................................................................................................44
Combustion Fan, Pressure Switch and Relay - 631275 ONLY..........................................45
Fan Module Fault Finding - Chart 10 (631275 Manufactured Before 09/02/05) .............46
Fan Module Fault Finding - Chart 11 (631275 Manufactured After 09/02/05)................47
Fault Finding (No error code / No Operation) – Chart 12 ...................................................51
Fault Finding (Intermittent Operation) - Chart 13 ...............................................................52
Fault Finding (Insufficient Hot Water) - Chart 14................................................................53
Fault Finding (Water Too Hot) - Chart 15...........................................................................54
Fault Finding (Leaking Water Heater) - Chart 16 ...............................................................55
Fluing Principals ................................................................................................................56
Component Replacement ..................................................................................................59
621265 Exploded View ......................................................................................................67
631265 Exploded View ......................................................................................................69
Burner Assembly Exploded View – 265L ...........................................................................71
621275 Exploded View ......................................................................................................72
631275 Exploded View - Heater ........................................................................................74
631275 Exploded View – Air Duct & Flue Terminal ...........................................................76
Burner Assembly Exploded View – 275L ...........................................................................78
Gas Type Conversion Procedure.......................................................................................79
Rheem Water Heater (Excluding Solar) Warranty .............................................................81
Document Revision History................................................................................................82
TM011 H.S.I Heavy Duty Gas Service Instructions
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Safety Warning
The purpose of these instructions is to provide sufficient information to allow a person with
the skills required by the Regulatory Authorities to carry out effective repairs to a Rheem
Gas Heavy Duty Water Heater in the minimum of time.
Safety precautions or areas where extra care should be observed when conducting tests
outlined in this service manual are indicated by print in bold italics and/or a warning
symbol. Take care to observe the recommended procedure.
If the supply cord is damaged, it must be replaced by the manufacturer or its
service agent or a similarly qualified person in order to avoid a hazard.
When conducting repairs to a gas appliance the gas train including injector
sizes must not be altered or modified in any way.
Certain diagnostic procedures outlined in these service instructions require
“live” testing to be conducted. Personal Protective Equipment should be
worn when conducting these tests to prevent the risk of electric shock. (Refer
to Rheem Safety Procedure on electrical testing)
Introduction
The information provided in these instructions is based on the water heater being installed
in accordance with AS5601 and the Installation Instructions provided with each water
heater.
Should you require further technical advice on a Rheem Heavy Duty Gas Water Heater,
contact your nearest Rheem Service Department where genuine replacement parts are
also available.
Heater Model Identification
All identification numbers are designed to convey detailed information about the heater to
which it is attached. For example the model number consists of 7 digits and 1 letter.
6
2
1
265
N
0
6 – Heavy Duty
2 - Internal
3 - External
0 - Pilot
1 - Electronic Ignition
Capacity in Litres
N - Natural Gas
T - Town Gas
P - Propane
B - Butane Gas
0 - No Reference
Note: Model number, serial number and date of manufacture must be quoted in all correspondence.
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Specifications
Model
621265
631265
621275
631275
680
680
680
680
800
800
800
800
1.13
1.13
1.13
1.13
2.75
2.75
2.75
2.75
0.75
0.75
0.75
0.75
3.5
3.5
3.5
3.5
82
82
82
82
84-90
84-90
84-90
84-90
3 x 1150 3 x 1150 3 x 1153 3 x 1153
38 x 600 Not fitted 76 x 845 76 x 845
RP1¼/32 RP1¼/32 RP1¼/32 RP1¼/32
RP¾/20 RP¾/20 RP¾/20 RP¾/20
1000
1000
1000
1000
RP¾/20 RP¾/20 RP¾/20 RP¾/20
2.90
2.90
3.80
3.80
4.80
4.80
6.50
6.50
2.50
2.50
3.20
3.20
8.60
8.60
10.50
10.50
2.50
2.50
2.65
2.65
0.85
0.85
0.90
0.90
0.32
0.32
0.50
0.50
110
110
200
200
Maximum Water
With ECV
Supply Pressure (kPa) Without ECV
Natural Gas
Minimum Gas Supply
LP & Butane Gas
Pressure (kPa)
Town Gas
Maximum Gas Supply Pressure (kPa)
Maximum Thermostat Setting (ºC)
ECO Cut Out Temperature (ºC)
Anodes
Qty X Length (mm)
Flue Baffle
Dia x Length (mm)
Water Connections
Diameter
Diameter
T&PR Valve
Rating (kPa)
Gas Connection
LP Gas
Natural Gas
Burner Injector (mm)
Butane Gas
Town Gas
LP & Butane Gas
Burner Pressure (kPa) Natural Gas
Town Gas
Thermal Input (MJ)
Preventative Maintenance
For peak performance it is suggested that the water heater be inspected prior to the winter
period where light to medium hot water usage occurs and six monthly where medium to
heavy usage occurs.
1. Check for discharge from the T&PR valve. Whilst the burner is off there should be no
discharge of water. When the burner is operating, a small discharge of water may be
evident. Operate the valve-easing lever to ensure the valve opens and resets
properly. Always open and close the valve gently. The T&PR valve should be replaced
at 5 yearly intervals.
2. Check the combustion chamber and burner for signs of scale deposits. Remove and
clean if necessary.
3. Check the main burner pressure is as stated on the Rating Plate Remember to replace
the test point screw.
4. Check main burner flame to ensure all parts ignite readily and that the flame is blue
with little or no yellowing of the tips. If necessary adjust the interrupter screw to
eliminate yellowing without inducing a harsh noisy blue flame.
5. Check the drain cock is not leaking.
6. Check for sludge build up and if necessary drain and flush tank.
7. Inspect and if necessary replace anodes. (Hard water areas only)
8. Check for signs of excessive corrosion on the jacket.
9. Check operation of auxiliary equipment i.e. circulator
10. Warn customer of the danger of using flammable materials or aerosol spray packs
near the water heater. Aerosols and harsh chemicals can cause premature failure of
water heater components.
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Lighting Instructions
The water heater incorporates an automatic ignition system. Switch on the power, when
the controlling thermostat registers heating is required the ignition sequence will
commence automatically. Should the unit fail to light after 4 ignition attempts the electronic
control system will enter lockout mode.
Operation
Heat Mode
1. Thermostat contacts close to call for heat
621265 and 631265 – Power supplied to ignition control module.
621275 – Flue damper opens and proving limit switch closes supplying power to
ignition control module. NOTE: During standby (thermostat contacts open) the flue
damper is held closed by power being applied to the flue damper motor.
631275
Manufactured Before 09/02/05 – Combustion fan and relay energised. Proving switch
contacts on pressure switch close when combustion pressure is achieved supplying
power to ignition control module.
Manufactured After 09/02/05 – Power supplied to ignition control module. The ignition
module checks (position proves) pressure switch is open and if so then supplies power
to the combustion fan and then checks that the pressure switch has closed.
2. The hot surface igniter warm up period commences (20 seconds)
3. At completion of the warm up period the gas valve is energised and opens to allow gas
to the main burner where ignition takes place.
Note: A door switch is wired in series with the gas control on the 631275. The gas
control will not operate if the access door is not in place.
4. The igniter is de-energised at the conclusion of the igniter activation period (I.A.P),
normally referred to as the ignition proving time, which is 2.5 seconds or proof of flame.
5. Thermostat contacts open when set temperature is achieved.
621265 and 631265 – Gas valve is de-energised cutting supply of gas to the burner
621275 – Flue damper closes and proving limit switch contacts open. Gas valve is deenergised cutting supply of gas to the burner.
631275
Manufactured Before 09/02/05 – Combustion fan and relay de-energised. Proving
switch contacts on pressure switch open when the pressure drops below required
combustion pressure. Gas valve is de-energised cutting supply of gas to the burner.
Manufactured After 09/02/05 – Combustion fan and gas valve is de-energised cutting
supply of gas to the burner. Proving switch contacts on pressure switch open when the
pressure drops below required combustion pressure.
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Retry Mode
If flame is not sensed during the Ignition Activation Period (2.5 seconds)
1. The gas valve is de-energised.
2. The system waits 5 minutes to allow for the escape of unburnt gas.
3. The normal ignition sequence is retried.
4. Igniter period remains at 20 seconds with the control re-entering “learn mode”.
5. The ignition control module will enter “retry lock out”, 1 flash, if burner ignition is
unsuccessful after 3 attempts.
Recycle Mode (Within a Thermostat Cycle)
If flame is established then lost after the I.A.P i.e. after flame was sensed
1. The gas valve is de-energised.
2. Normal ignition sequence is started
3. No increase in igniter warm up time.
4. The ignition control module will enter “retry lock out”, 1 flash, if burner ignition is
unsuccessful after 3 attempts.
Note: Infinite recycles and three ignition retries are allowed during any one (1) thermostat
cycle.
Normal Mode
After flame has been sensed, the ignition control module enters the normal operating loop
where all inputs are continuously checked.
Lockout or Wait Mode
When the ignition control module enters “lock out” or “wait” modes the condition can be
cleared by turning the power off and then on again at the power point or by pressing the
reset button for approximately 1 second.
Note: If the fault continues to exist i.e. an open circuit igniter, the module will immediately
re-enter the lockout or wait mode and display a fault code.
Safety Features
If the ignition control module is energised and flame is detected when the gas valve is deenergised, the ignition control module enters the “safety wait mode”, 5 flashes.
If the gas valve is energised 4 consecutive times and flame is not sensed within the I.A.P,
the ignition control module will enter “retry lock out”, 1 flash.
In the event of a flame failure during a heating cycle the gas valve is closed in 0.9
seconds. If flame is not detected within 2.5 seconds from the commencement of the trial
for ignition period the gas valve is closed.
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Heating Cycle Flow Chart - 621265, 631265, 621275 & 631275 (Before 09/02/05)
Connect power
Rectify fault
621265
631265
Controlling
thermostat contacts
close
621275
Power supplied to flue
damper relay
Flue damper opens
Power supplied to
ignition module
631275 pre 09/02/05
Power supplied to
combustion fan module
Fan starts
Pressure switch closes
Cold start up
Internal
safety check
ok?
Can
module be
reset?
Solid LED
(lock out)
NO
YES
Event counter limit
exceeded
NO
Control module
internal failure
YES
Warm start up
Polarity
check ok?
Auto reset
6 Flashes
(wait mode)
NO
Check repeated
continuously
YES
Polarity
check ok?
NO
False flame
detected?
5 Flashes
(wait mode)
YES
Check repeated
continuously
NO
False flame
detected?
NO
Igniter
circuit
ok?
YES
YES
Igniter
circuit
ok?
4 Flashes
(wait mode)
NO
Recheck igniter circuit
three minutes later
YES
NO
Hot surface igniter energised
5 minutes later
Hot surface igniter off
Gas valve energised
Flame
detected?
Gas valve closed
No
of ignition
retries
>4
NO
Within 2.5 seconds
YES
Hot surface igniter off
Continuous check mode
entered
Frequency
check ok?
YES
NO
YES
1 Flash
(Lock out)
NO
Rapid flash
DC current approx 4µA
AC current < 6.5µA
Flame
detected?
YES
Frequency
check ok?
YES
NO
YES
7 Flashes
(wait mode)
NO
Flame
detected?
NO
Gas valve closed
YES
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Heating Cycle Flow Chart - 631275 (After 09/02/05)
Connect power
Controlling
thermostat contacts
close
Power supplied to
ignition module
Rectify fault
Cold start up
Internal
safety check
ok?
Can
module be
reset?
Solid LED
(lock out)
NO
YES
Event counter limit
exceeded
NO
Control module
internal failure
YES
Warm start up
False flame
detected?
Auto reset
5 Flashes
(wait mode)
YES
Check repeated
continuously
NO
False flame
detected?
NO
YES
pressure
switch
open?
2 Flashes
(wait mode)
NO
Check repeated
continuously
YES
pressure
switch
open?
YES
NO
Fan energised
pressure
switch
closed?
3 Flashes
(wait mode)
NO
Check repeated
continuously
YES
pressure
switch
closed?
YES
NO
Polarity
check ok?
6 Flashes
(wait mode)
NO
Check repeated
continuously
YES
Polarity
check ok?
YES
Igniter
circuit
ok?
YES
NO
Igniter
circuit
ok?
4 Flashes
(wait mode)
NO
Recheck igniter circuit
three minutes later
YES
NO
Hot surface igniter energised
5 minutes later
Hot surface igniter off
Gas valve energised
Flame
detected?
Gas valve closed
No
of ignition
retries
>4
NO
Within 2.5 seconds
YES
Hot surface igniter off
Continuous check mode
entered
Frequency
check ok?
YES
NO
YES
1 Flash
(Lock out)
NO
Rapid flash
Frequency
check ok?
YES
DC current approx 4µA
AC current < 6.5µA
Flame
detected?
NO
YES
7 Flashes
(wait mode)
NO
Flame
detected?
NO
Gas valve closed
YES
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Burner Extinction Cycle Flow Chart
Thermostat contacts open
621275
631275
Pre 09/02/05
631275
After 09/02/05
Flue damper relay
de-energized
Combustion fan relay
de-energized
Ignition module
de-energized
Flue damper motor
energized
621265
631265
Combustion fan
motor de-energized
Pressure switch
contacts to “normally
closed” position once
fan stops
Flue damper closed
Combustion fan
de-energized &
Gas valve closed
Burner extinguished
Ignition module
de-energized
Pressure switch
contacts to “normally
open” position once
fan stops
Gas valve closed
Burner extinguished
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Wiring Diagram 621265 / 631265
TM011 H.S.I Heavy Duty Gas Service Instructions
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Wiring Diagram 621275
TM011 H.S.I Heavy Duty Gas Service Instructions
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Wiring Diagram 631275 - Manufactured Before 09/02/05
TM011 H.S.I Heavy Duty Gas Service Instructions
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Wiring Diagram 631275 - Manufactured After 09/02/05
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Components and their Function
Gas Control Valve: The gas valve is a White Rodgers model 36C90H-408 220/240 volt
AC double solenoid valve suitable for use with electronic controllers.
An insulated one-shot thermal fuse is incorporated into one of the solenoid leads to act as
a cut out in the event of excessive heat spillage from the combustion chamber.
The thermal fuse will open circuit at temperatures of 90ºC to 100ºC.
The gas valve is gas type convertible (refer to gas type conversion procedure on page 79.
Ignition Module: The ignition module controls the operation of the burner ignition
sequence. Each step of the sequence is timed by the controller, in the event of a
malfunction the controller will enter either a ‘wait’ or ‘lock out’ mode and display an error
code on an LED indicated by a series of flashes (refer to page 31).
If the burner fails to light during the ignition sequence the controller will attempt to relight
the burner 3 times. If the third reattempt is unsuccessful the controller will “lock out”.
Operating temperature range is 0ºC to 60ºC. The controller will operate on a line voltage of
187-264 volts AC. Where the line frequency (50 or 60 Hz) varies by more than +/- 5% the
controller will not operate.
Flue Damper (621275 ONLY): The flue damper is designed to minimise heat loss through
the flue system during standby.
The butterfly flap is not pierced as the H.S.I heavy-duty range does not utilize a standing
pilot.
Prior to the ignition sequence commencing the flue damper is rotated to the open position,
two limit switches, 1 primary and 1 safety, are incorporated into the flue damper to ‘prove’
the damper is open. The flue damper is motor driven closed; a spring mounted on the
shaft opens the damper.
A replaceable 1.6 amp fuse is mounted on the damper enclosure to protect the damper
PCB from damage should the gas control and ignition control module fail.
Igniter and Flame Probe: The igniter rod is manufactured from Silicon Nitrate. When
power is applied, the rod glows to ignite the gas. This system is known as hot surface
ignition (H.S.I.)
The flame rod is manufactured from Canthal-D and forms part of the flame proving system.
A small electric current is passed from the ignition module to the flame rod and then
through the flame to earth. This is known as flame rectification.
Note: The flame proving system will only work when the water heater is connected to a
correctly polarised and earthed neutral mains supply.
Over Temperature Energy Cut Out (E.C.O.): A temperature-sensing device that
automatically cuts off the power supply to prevent excessive water temperature occurring.
This device will not reset automatically, however it can be manually reset once
temperatures have fallen to a safe level.
Anode (sacrificial): A metal alloy electrode which, by galvanic action, protects the inner
cylinder from corrosion.
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Temperature and Pressure Relief 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, do NOT use reconditioned T&PR valves.
Delivery Tube (Dip Tube): A polypropylene tube fitted inside the water heater cylinder to
conduct water from the highest point to the outlet connection. It also acts as a fitting liner.
Inlet Diffuser: A device installed in the cold water inlet of the water heater to help control
temperature stratification within the cylinder.
Flue Baffle: A baffle inserted into the water heater flue tube that slows the passage of flue
gases to ensure maximum heat transfer to the stored water.
Draught Diverter (indoor models): A cowl installed at the top of the water heater
between the primary flue and secondary flue to help prevent adverse draughts affecting
the gas burner operation.
Combustion Fan (631275 only): A fan and electric motor combination, installed in the air
duct to provide sufficient primary air for combustion.
Pressure Switch (631275 only): A device sensitive to air pressure incorporating a microswitch.
When sufficient pressure is created by the combustion fan the micro-switch contacts close
supplying power to the ignition control module (models manufactured before 09/02/05 or
closing a proving circuit in the ignition module (models manufactured after 09/02/05)
Relay (631275 Manufactured before 09/02/05 only): An electric coil operating a pair of
single throw contacts.
The relay is interlocked electrically with the combustion fan and pressure switch as a
safety measure to prevent operation of the gas burner in the event the pressure switch,
combustion fan or both have failed.
Product Changes
Controlling Thermostat (All models)
•
An AKO electronic thermostat has replaced the Robertshaw mechanical thermostat,
allowing accurate temperature and differential control.
•
Two temperature sensors (thermistors) mounted in wells at the same heights as the
inlet and outlet of the water heater are utilized to detect the water temperature at the
top and bottom of the tank. A small electronic circuit board installed in the sensor wiring
offsets the cold sensor reading to provide the average temperature for the entire tank.
•
The electronic thermostat features an external LED display indicating the water
temperature, or in the event of a failure, an error code (refer to page 25).
Viewing Windows
• Viewing windows have been added to all models to allow the LED on the ignition
module to be observed without the need to remove any covers
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Ignition Module (All Models Except 631275 Manufactured After 09/02/05)
The 50A72-298 ignition module replaces the 50A72-208.
The new module features
• 3 re-ignition attempts, with a 5-minute delay between each attempt
• Volatile memory. Turning the power off and on at the power point will now reset the
ignition module. A reset button is also fitted on the ignition module.
•
With the exception of ignition failure (1 flash lockout) the ignition module will enter a
‘wait’ mode when a fault is detected and will automatically reset if the fault clears.
Ignition Module (631275 Manufactured After 09/02/05)
The 50A72-178 ignition module replaces the 50A72-298. These two ignition modules are
not interchangeable, to prevent fitment of the incorrect module the wiring loom plugs are
not compatible.
The new ignition module
• Utilises an internal method of checking the pressure switch position (position proving)
and also supplies power to the combustion fan rendering the relay and its associated
wiring obsolete.
• Eliminates the need for a proving relay in the fan module
• Has two additional fault codes (2 flashes and 3 flashes) both relating to the pressure
switch position (refer to page 31). All other fault codes remain the same as the earlier
ignition module.
• Has a 30 second delay before energising the fan motor, eliminating fan run on
problems associated with power brown outs (refer to page 45).
To overcome fan run on problems, it is possible to convert a 631275 fitted with a 50A72298 ignition module to use the 50A72-178 ignition module. For full instructions refer to
Technical Bulletin TB05 011.
Limit Thermostat
•
The auto reset upper limit thermostat has been deleted and replaced with a manual
reset ECO thermostat located where the mechanical thermostat was positioned in past
models.
Flue Damper (621275 Only)
•
A replaceable 1.6 amp fuse has been added to the flue damper control circuit. In the
event the gas valve or ignition module suffers a major electrical failure the fuse will blow
protecting the flue damper control circuit from any resulting short circuit or power surge.
Access Door (631275)
•
A small indentation has been added to the access door to provide a more positive
action on the door switch. This modification is to overcome intermittent contact resulting
in fan run on without burner operation.
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Common Faults
When a complaint is lodged about the performance of a hot water system there are a
number of causes that should be checked and eliminated. In an attempt to pinpoint the
most likely cause it is important to discuss with the customer their reasons for the
complaint, the duration of the problem, any change in circumstances or usage and recent
weather conditions. This information in conjunction with the following listed common
complaints will assist in locating the most likely cause. All procedures assume there is
water flowing through the water heater.
Water hammer
A water heater will not cause water hammer, however valves associated with the water
heater may be the source of the problem i.e. cold-water stopcock, non-return valve, T&PR
valve or relief valve.
Most water hammer problems are associated with plumbing, hot and cold, or appliances
i.e. solenoid valves, ball cocks, loose pipes, sharp angles in pipe work, faulty or worn valve
parts or neighbouring equipment.
High water pressure areas will have more complaints of this nature and the use of a
pressure-limiting valve (PLV) to reduce the household cold-water pressure will usually
solve most problems.
Excessive hot water usage
The complaints of insufficient hot water and no hot water can on many occasions be
attributed to hot water usage exceeding the capacity of the water heater to provide hot
water.
When first attending a call of this nature it is essential to establish the probable hot water
usage by querying the usage habits of the household and compare this with the potential
delivery of the model water heater installed. It can then be established if the usage is
within or outside the capacity of the model. The areas to look at for excessive usage are:
1. Automatic washing machines.
2. Showers exceeding 11 litres per minute for mixed water and 5 minutes in duration.
3. Two or more showers operating at the same time.
4. Change of occupancy or number of persons increased.
5. High water pressure area. (Excessive T&PR discharge)
6. Plumbing leaks
Discoloured water
1. This may be the result of discoloured water entering from the cold water mains. Check
if the cold water is also discoloured.
2. Brown coloured water will generally indicate that the anode has been depleted or the
water heater is near the end of its useful life.
3. Milky coloured water is generally air in suspension and will disperse of its own accord.
In very hard water areas where anode gassing occurs, milky water may be evident. The
use of a blue anode should overcome this problem.
TM011 H.S.I Heavy Duty Gas Service Instructions
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16
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Hot water plumbing leaks
If hot water has not been used for a period of time, feeling the temperature of the hot water
line may give an indication of water flow if the pipe is warm. The method of checking for
plumbing leaks is:
1. Turn off the stopcock on the cold water supply to the water heater.
2. Open a hot tap to ensure the flow of water stops. This will confirm the stopcock is
operating correctly.
3. Turn off the hot tap.
4. Turn on the stopcock to make up the water pressure in the cylinder, and then turn the
stopcock off again.
5. Wait approximately 5 minutes then do either of the following:
a. With your ear close to the stopcock turn it on slightly and listen for any water
passing. If there are no leaks, water should not pass.
b. Open a hot tap while listening for any pressure release. If there is a pressure
release there will be no leaks in the plumbing system.
Mixing or crossed connections
If an automatic dishwasher, washing machine, flick mixer tap, tempering valve or
thermostatic mixing valve is installed there is always the possibility that the cold water
could mix with the hot water through a faulty or incorrectly installed valve.
This is referred to as a cross connection. The complaints of insufficient hot water, water
too cold or excessive discharge from the T&PR valve may be attributed to a cross
connection. The method of checking for a cross connection is:
1. Turn off the stopcock on the cold water supply to the water heater.
2. Open a hot tap. If water flow is persistent and cold a cross connection exists.
Manifolding - Headers
Very often complaints surrounding insufficient hot water in commercial installations can be
attributed to poor manifolding.
In order for the water heaters to operate simultaneously the water flow through all the
cylinders must be the same to ensure the temperature drop is equal.
In a worst-case scenario it is possible for 2 or 3 of the water heaters in a bank to almost
never operate.
This results in an overall loss of heat input to the water moving through the building and
can be confused as the installation being undersized or a malfunction of the water heaters.
The principle of Equa-Flow is to ensure the demand on each water heater in the bank is
the same as any other. To achieve this, the following are necessary:
TM011 H.S.I Heavy Duty Gas Service Instructions
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1. The cold water manifold must be
designed to balance the flow to each
unit i.e. each branch line must be the
same diameter and length and be
fitted with identical ball or gate
valves.
2. The hot water manifold must be
designed to balance the flow from
each unit i.e. each branch line must
be the same diameter and length and
be fitted with identical ball or gate
valves.
In Line Manifold
Manifolding - Types
1. All the water heaters must be of the
same size and capacity.
2. The first heater supplied from the cold
(inlet) manifold must be the last
heater supplying the hot (outlet)
manifold (refer to examples opposite
and below).
Back to Back Manifold
TM011 H.S.I Heavy Duty Gas Service Instructions
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Angle Manifold
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Fault Finding - Chart 1
Power Supply
1.1
Is the
thermostat display
blank?
Is
there power
at the terminal
block?
YES
Test 1
YES
1
NO
Test 2
NO
Is
there power
at the
GPO?
Increase the set point above
the current water temperature
by at least 5 degrees
YES
Test 3
Are the
thermostat contacts
closed?
Test 4
NO
Is the water
temperature at or
above the thermostat
setting?
NO
1.2
Does
the burner
light?
YES
Replace cord
Refer to electrician
2
NO
YES
Test 5
Is
there power
at the ignition
module?
Yes
Refer to ignition
module section
NO
YES
Is the
complaint for
intermittent
operation?
YES
Insufficient hot water
NO
6
Leaking
YES
Test 6
Is
the sail or
pressure switch
closed?
YES
NO
NO
Select model
This document is stored and maintained electronically by
Refer to installer
Refer to flue damper
section
621275
631275
621265
631265
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
4
5
Water too hot
Is
a power flue or
mechanical venting
system installed?
3
Refer to fan module
section
Wiring loom open
circuit. Check for
breaks or damaged
wiring
19
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Component Tests 1- 3
Test 1
Components
will
be
“live”.
Personal Protective Equipment
should be worn when conducting
these tests.
Using a multimeter set on the AC volts
scale, measure between active and neutral
and active and earth on the terminal block.
Normal voltage is AC240 volts. If either
test fails a polarity or wiring problem exists.
Test 2
Components
will
be
“live”.
Personal Protective Equipment
should be worn when conducting
these tests.
Using a multimeter set on the AC volts
scale, unplug the 3-pin plug from the GPO
and measure between the active and
neutral pins and between the active and
earth pins of the GPO.
Normal voltage is AC240 volts. If either
test fails a polarity or wiring problem exists.
Test 3
Components
will
be
“live”.
Personal Protective Equipment
should be worn when conducting
this test.
Note: On outdoor models the rain shield
should be removed while conducting this
test.
Using a multimeter set on the AC volts
scale, measure between terminal 1
(orange wire) and terminal 4 (blue wire) at
the thermostat.
Normal voltage when thermostat contacts
are closed is AC240 volts
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Component Tests 4 - 6
Test 4
Hot water capable of scalding may
discharge from the T&PR valve drain.
Personal Protective Clothing should
be worn when conducting this test.
60
Press the down button on the thermostat for 5
seconds the current ‘set point’ temperature will
be displayed. Using a thermometer measure
the water temperature at the T&PR valve
drain.
If the measured temperature is equal to or
greater than the set point there will not be a
call for heat
Test 5
Components will be “live”. Personal
Protective Equipment should be worn
when conducting this test.
Using a multimeter set on the AC volts scale,
measure between the orange wire (“LINE”)
and the blue wire (“LINE COM”) on the ignition
module.
Normal voltage is AC240 volts.
Test 6
Components will be “live”. Personal
Protective Equipment should be worn
when conducting this test.
240
NOTE:
The thermostat must be calling for heat and
the flue or mechanical ventilation fan operating
to conduct this test. (Refer to test 3)
Using a multimeter set on the AC volts scale,
measure between the switch wire from the
pressure or sail switch and neutral on the
terminal block
Normal voltage is AC240 volts.
TM011 H.S.I Heavy Duty Gas Service Instructions
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Fault Finding - Chart 2
1
Disconnect power
and test ECO
Test 7
Is
the ECO open
circuit?
NO
Restore Power
YES
Test 8
Is the
thermostat display
still blank?
Reset the ECO and
restore power
Is there
power at the
thermostat?
YES
YES
NO
Check the set
temperature
Wiring loom open circuit.
Locate break and repair
2.1
Test 4
Is the set
temperature 82
degrees?
Replace thermostat
Is
a circulator
fitted?
YES
NO
Advise customer to have
a circulator fitted
NO
Replace circulator
YES
NO
Is
the circulator
operating?
Check the thermostat
offset and differential
settings
YES
Refer to Thermostat section
Are
the settings
correct?
Reprogram the
thermostat correctly
NO
YES
Does the
display show AH 88
or E1?
YES
NO
Test 9
Is
the resistance
of the sensors
correct?
Replace temperature
sensor set
NO
YES
Does
the displayed
temperature and the
water temperature
match?
NO
YES
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
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Adjust offset (CO)
parameter so water
temperature and
thermostat match. Refer
to Thermostat section
5
22
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Component Tests 7- 9
Test 7
Ensure power is isolated prior to
conducting this test.
Using a multimeter set on the x1 scale,
measure across the terminals of the over
temperature cut out.
Normal resistance should be less than 1
ohm.
Test 8
Components
will
be
“live”.
Personal Protective Equipment
should be worn when conducting
this test.
Using a multimeter set on the AC volts
scale, measure between terminal 2 (red
wire) and terminal 4 (blue wire) and
terminal 3 (red wire) and terminal 4 (blue
wire) of the thermostat.
Normal voltage for both tests is AC240
volts.
Indoor model shown
Test 9
Ensure power is isolated prior to
conducting this test.
60
Remove the hot and cold sensors from the
probes and using a thermometer measure
and note the temperature inside each
probe.
Using the table and formula on page 29
calculate the resistance.
Reinsert the hot and cold sensors into the
probes, wait 2 minutes then unplug the
sensor set from the thermostat and using a
multimeter set on x1000 resistance scale
measure the resistance of the sensor set.
The measured value should be within 5%
of the calculated value.
TM011 H.S.I Heavy Duty Gas Service Instructions
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Electronic Thermostat
The electronic thermostat has several parameters that control the water heater operation.
Under normal conditions, including a power outage, these settings do not require
adjustment, however following a thermostat replacement or if the delivered water
temperature deviates significantly from that displayed on the thermostat, the settings
should be checked and may require adjustment.
Thermostat Parameters
Parameter
Description
Range
MIN
MAX
C0
Temperature Probe Calibration (Offset)
Temperature increase or decrease added to the temperature
-20ºC +20ºC
detected (displayed) to adjust the temperature probe to the
actual value.
C1
Differential
Temperature decrease from the thermostat “set point”
required before the thermostat contacts close to initiate the
heating cycle.
1ºC
20ºC
C2
Maximum “Set Point” Limiter
The “set point” cannot be adjusted above this value, with the
“AH” (alarm high) temperature alarm activated if the detected
temperature rises above this value.
xxºC
82ºC
C3
Minimum “Set Point” Limiter
The “set point” cannot be adjusted below this value, with the
-50ºC
“AL” (alarm low) temperature alarm activated if the detected
temperature falls below this value.
xxºC
P0
Type of operation (Heat/Cool)
Selects the thermostat operation for cooling or heating
applications
0 = Cooling (Differential above the “set point”)
1 = Heating (Differential below the “set point”)
0
1
P2
Block Programmed Parameters
Prevents parameters from being altered
0 = No (Parameters can be altered)
1 = Yes (Parameters cannot be altered)
0
1
EP
Exit Programming
Locks in changes made to parameters.
-
-
The electronic thermostat features several other parameters that are not utilized by the
heavy-duty gas models; these must not be altered from the existing settings.
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
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Electronic Thermostat Diagnosis
In the event a fault occurs either internally or externally a 2-digit code will be displayed on
the thermostat LED to indicate the fault.
Code
AL
AH
Fault
Possible Cause
Ignition module in “wait” or “lock out” mode
Temperature below the minimum set
Gas supply failure
point parameter C3
Ancillary equipment failure i.e. power flue
Burner not shutting down
Temperature above the maximum Stacking
set point parameter C2
Thermostat incorrectly programmed
Circulator not fitted for 82º setting
EE
Memory error
Replace thermostat
E1
Temperature sensor set open circuit
Replace sensor set
Electronic Thermostat Adjustment
Thermostat Parameters
The table below details the parameter settings for the thermostat set point. These
parameters MUST be set correctly for the water heater to operate properly.
Temperature
“Set Point”
60 - 64
65 - 69
70 - 74
75 - 79
80 - 81
82
(Recirculation required)
(C0)
14
15
16
17
18
(C1)
2
2
2
2
2
Parameter
(C2)
80
80
80
85
85
18
2
85
(C3)
55
60
65
70
75
(P0)
1
1
1
1
1
75
1
Note: During the programming process if a button is not pressed for 25 seconds or the
programme is not exited via the EP parameter the thermostat will revert to the temperature
display without modifying the program. It will be necessary to reprogram the thermostat
again should this occur.
Adjusting the Water Temperature
When adjusting the thermostat setting (‘set point’) it
will also be necessary to alter the offset. The table
opposite outlines the thermostat temperature and the
corresponding offset.
Failure to adjust the offset will result
in incorrect outlet water temperature.
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
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Temperature ºC
60 – 64
65 – 69
70 – 74
75 – 79
80 – 81
82
(Recirculation required)
Offset (C0)
14
15
16
17
18
18
25
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
To adjust the thermostat setting and offset
1. Press the “down” button for 5 seconds. The current set point temperature will be
displayed. Release the button.
2. Press the “down” button to decrease the set point or the “up” button to increase the set
point.
3. Once the required temperature is selected, press and hold the “down” button and the
“up” button simultaneously. The display will revert to the current water temperature in
the water heater.
4. Press and hold the “down” button and the “up” button simultaneously for 10 seconds,
“C0” (offset program) will be displayed. Release the buttons.
5. Press and hold the “down” button and the “up” button simultaneously again. The
current setting for “C0” will be displayed. Release the buttons.
6. Press the “down” button to decrease the setting or the “up” button to increase the
setting according to the table above i.e. if the temperature set in step three is 60 then
the offset value must be 14 (refer to table on page 25).
7. Once the required offset is selected press and hold the “down” button and the “up”
button simultaneously, “C0” will be displayed.
8. Press the “down” button once; “EP” (exit program) will be displayed.
9. Press and hold the “down” button and the “up” button simultaneously; the current water
temperature in the water heater will now be displayed and programming complete.
To adjust the differential
1. Press and hold the “down” button and the “up” button simultaneously for 10 seconds,
“C0” (offset program) will be displayed. Release the buttons.
2. Press the “up button once, “C1” is displayed.
3. Press and hold the “down” button and the “up” button simultaneously again. The current
setting for “C1” will be displayed. Release the buttons.
4. Press the “down” button to decrease the setting or the “up” button to increase the
setting according to the table on page 25 i.e. for a set temperature of 60 then the
differential value is 2.
5. Once the required differential is selected press and hold the “down” button and the “up”
button simultaneously, “C1” will be displayed.
6. Press the “down” button twice; “EP” (exit program) will be displayed.
7. Press and hold the “down” button and the “up” button simultaneously; the current water
temperature in the water heater will now be displayed and programming complete.
TM011 H.S.I Heavy Duty Gas Service Instructions
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To adjust the maximum set point
1. Press and hold the “down” button and the “up” button simultaneously for 10 seconds,
“C0” (offset program) will be displayed. Release the buttons.
2. Press the “up button until “C2” is displayed.
3. Press and hold the “down” button and the “up” button simultaneously again. The current
setting for “C2” will be displayed. Release the buttons.
4. Press the “down” button to decrease the setting or the “up” button to increase the
setting according to the table on page 25 i.e. for a set temperature of 60 then the
maximum set point value is 80.
5. Once the required maximum set point is selected press and hold the “down” button and
the “up” button simultaneously, “C2” will be displayed.
6. Press the “down” button until “EP” (exit program) is displayed.
7. Press and hold the “down” button and the “up” button simultaneously; the current water
temperature in the water heater will now be displayed and programming complete.
To adjust the “minimum set point”
1. Press and hold the “down” button and the “up” button simultaneously for 10 seconds,
“C0” (offset program) will be displayed. Release the buttons.
2. Press the “up button until “C3” is displayed.
3. Press and hold the “down” button and the “up” button simultaneously again. The current
setting for “C3” will be displayed. Release the buttons.
4. Press the “down” button to decrease the setting or the “up” button to increase the
setting according to the table on page 25, i.e. for a set temperature of 60 then the
minimum set point value is 55.
5. Once the required minimum set point is selected press and hold the “down” button and
the “up” button simultaneously, “C3” will be displayed.
6. Press the “down” button until “EP” (exit program) is displayed.
7. Press and hold the “down” button and the “up” button simultaneously; the current water
temperature in the water heater will now be displayed and programming complete.
To adjust the “type of operation”
1. Press and hold the “down” button and the “up” button simultaneously for 10 seconds,
“C0” (offset program) will be displayed. Release the buttons.
2. Press the “up button until “P0” is displayed.
3. Press and hold the “down” button and the “up” button simultaneously again. The current
setting for “P0” will be displayed. Release the buttons.
4. Press the “down” button or the “up” button to change the setting. The type of operation
must be set to 1.
5. Press and hold the “down” button and the “up” button simultaneously, “P0” will be
displayed.
6. Press the “down” button until “EP” (exit program) is displayed.
7. Press and hold the “down” button and the “up” button simultaneously; the current water
temperature in the water heater will now be displayed and programming complete.
TM011 H.S.I Heavy Duty Gas Service Instructions
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To unblock parameters
1. Press and hold the “down” button and the “up” button simultaneously for 10 seconds,
“C0” (offset program) will be displayed. Release the buttons.
2. Press the “up button until “P2” is displayed.
3. Press and hold the “down” button and the “up” button simultaneously again. The current
setting for “P2” will be displayed. Release the buttons.
4. Press the “down” button or the “up” button to change the setting. In order to be able to
adjust parameters “P2” must be set to 0.
5. Press and hold the “down” button and the “up” button simultaneously, “P2” will be
displayed.
6. Press the “down” button until “EP” (exit program) is displayed.
7. Press and hold the “down” button and the “up” button simultaneously; the current water
temperature in the water heater will now be displayed and programming complete.
Temperature variation
In some cases the actual water temperature may vary from that displayed on the
thermostat despite the parameters being correctly programmed. This is most likely to
occur in recirculated systems.
In order to check the actual tank water temperature, the measurement:
1. Must be taken at the T & PR valve drain line.
2. The burner must be off for at least 5 minutes before the temperature measurement is
taken.
3. Water should not be drawn from the system.
If the temperature deviates from that displayed on the thermostat by more than 2 degrees
it will be necessary to custom set the offset parameter.
When reprogramming the offset parameter (C0) it will be necessary to take into account
the current “offset” already programmed into the thermostat.
For example if the current “set point” is 70 then the offset should currently be set at 16. If
the displayed temperature is 70ºC but the actual measured water temperature is 75ºC then
the offset will need to be increased by 5 (the difference between the displayed temperature
and the measured temperature) from 16 to 21, not set at 5.
The same principal applies if the thermostat is reading high. Using the example above if
the measured water temperature was 65ºC then the offset will need to be decreased by 5
(the difference between the displayed temperature and the measured temperature) from
16 to 11, not set at –5.
NOTE: Where the displayed water temperature is 10 or more degrees BELOW the
measured water temperature and the thermostat offset is programmed correctly for the set
point, conduct a sensor resistance test (refer to test 9). If the sensor set is faulty do NOT
attempt to overcome the difference by adjusting the thermostat offset, replace the sensor
set.
TM011 H.S.I Heavy Duty Gas Service Instructions
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Cold Sensor
-t
-t
The temperature sensor set consists of 2 NTC (negative
temperature coefficient) thermistors, which form the hot and cold
sensors.
Hot Sensor
Temperature Sensor Set
In order to achieve the average water temperature in the cylinder
the cold sensor has an additional resistor connected in parallel to
it (refer to the circuit diagram opposite), this resistor is mounted
on a small circuit board insulated into the sensor wiring loom.
BIAS Resistor
(2700 ohms)
PCB
It is critical that the cold sensor (designated by BLUE heat shrink
on the wiring) is always installed in the lower sensor pocket and
the hot sensor (designated by RED heat shrink on the wiring) is
always mounted in the top sensor pocket. Failure to do so will
cause the heater to malfunction.
Sensor Resistance
Molex Plug
ºC
0
5
10
15
20
25
30
In order to calculate the overall
resistance of the sensor set it will be
necessary
to
measure
the
temperature in the hot and cold
sensor probes using a thermometer
and then using the table opposite
(applies to both sensors) and formula
below, calculate the resistance.
Sensor set resistance =
R1 x R3
( R1 + R3 )
Ohms
27280
22050
17960
14680
12090
10000
8313
ºC
35
40
45
50
55
60
65
Ohms
6941
5828
4912
4161
3537
3021
2589
ºC
70
75
80
85
90
95
100
Ohms
2229
1924
1669
1451
1266
1108
973
+ R2
Where:
R1 = cold sensor resistance, R2 = hot sensor resistance & R3 = Bias resistor (2700 ohms)
Example:
The measured temperature of the cold sensor pocket is 60 degrees and the hot sensor
pocket is 70 degrees. From the table above the resistances for each sensor are 3021
ohms and 2229 ohms respectively, therefore
Sensor set resistance =
(
3021 x 2700
3021 + 2700
)
+ 2229
Sensor set resistance =
(
8156700
5721
)
+ 2229
Sensor set resistance =
1425.75
+ 2229
=
3654.75 ohms
Sensor Fault Conditions
Symptom
Thermostat displays E1
Thermostat displays AH 88
Thermostat reads low
Thermostat reads high
TM011 H.S.I Heavy Duty Gas Service Instructions
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Possible Cause
Hot sensor open circuit
Hot sensor short circuited
Cold sensor open circuit
Cold sensor short circuited
Remedy
Replace
Sensor Set
29
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Fault Finding – Chart 3
2
Is the
thermostat
displaying an error
code?
NO
Refer to Thermostat section
Are the
thermostat
parameters set
correctly?
NO
Reprogram thermostat
correctly and retest
operation. Refer to
Thermostat section
Is the
reading UNDER
by 10 or more
degrees?
Adjust offset (CO)
parameter so water
temperature and
thermostat match. Refer
to Thermostat section
YES
Test 4
Does
the displayed
temperature and the
water temperature
match?
YES
NO
NO
YES
Replace sensor set
YES
EE?
Replace thermostat
YES
Replace thermostat
NO
Test 9
NO
E1?
Is the
resistance of
the sensors
correct?
YES
NO
YES
NO
AL?
Replace sensor set
YES
Is the
thermostat
parameter C3 set
correctly?
Replace thermostat
Refer to Thermostat section
Reprogram thermostat
correctly and retest
operation. Refer to
Thermostat section
NO
YES
NO
Replace thermostat
Refer to Thermostat section
AH?
YES
Is the
thermostat
parameter C2 set
correctly?
YES
Is
the fault
AH 88?
Reprogram thermostat
correctly and retest
operation. Refer to
Thermostat section
NO
Test 4
Does
the displayed
temperature and the
water temperature
match?
NO
NO
YES
YES
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
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Adjust offset (CO)
parameter so water
temperature and
thermostat match. Refer
to Thermostat section
2.1
Replace sensor set
30
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Ignition Module
The ignition module continuously performs a self-check routine. Any time a fault is
detected, internally or externally the module will enter either a “wait” mode or a “lock out”
mode depending on the fault detected.
An LED indicator light on the ignition module will emit a series of flashes to indicate the
fault. The LED will flash on for approximately ¼ second and off for approximately ¼
second. A 2 second delay occurs between each group of flashes.
The LED will stay on continuously for approximately 1 second when power is turned on.
With the exception of ignition retry lockout (1 flash) the ignition module will automatically
reset if the fault clears or is rectified (repaired). Ignition retry “lockout” requires a manual
reset to be performed.
Fault Codes
Fault
1
Ignition retry lockout
2*
Pressure switch not open
Pressure
switch
not
closed
3*
4
5
6
7
Faulty igniter / igniter
sensing circuit
Flame detected with gas
valve de-energised
Reversed polarity
Flame
failure
sense
circuit
Possible Cause
Gas failure
Low gas pressure
Failed gas valve
Faulty pressure switch
Faulty fan
Faulty pressure switch
Faulty igniter
Poor connection in multi-pin plug
Power spike
Failed ignition control module
Failed gas valve
Active and Neutral reversed
AC leakage > than 6.5μA
High resistance to earth
Moisture
Low gas pressure
Action
Rectify fault and
manually reset
ignition module
Auto reset when fault is rectified
Flashes
* Fault code only available on ignition module 50A72-178 utilised in 631275 models
manufactured after 09/02/05.
Flashes
Steady
Fault
Action
Module failure or event counter limit Reset the module, if the LED remains
exceeded
steady replace module
• If the module resets the event counter has been exceeded indicating there is a fault
with the heater or the installation i.e. low gas pressure.
Flashes
Rapid flash
•
Fault
Frequency check failure
Cause
Poor supply frequency
Check for large contactors, relays or electronic speed controllers in the plant room.
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1 Flash (Retry lockout) - Chart 4
This fault occurs if flame is not sensed after the fourth ignition attempt and is most
commonly caused by insufficient gas pressure.
Reset the ignition module and
allow the heater to relight
This procedure assumes there is
power to the ignition module!
Does
the igniter
glow?
Test 10
Is
there an output
from the ignition
module?
NO
Replace the ignition
module
NO
YES
Replace the igniter
assembly
YES
Did
the burner
light?
YES
Did
the burner remain
lit?
Check the ‘dynamic’
inlet gas pressure. Refer
to installer if low
YES
With all gas burning appliances lit the supply
pressure to the heater must be at least 1.13
kPa (natural gas) or 2.75 kPa (Propane gas)
NO
Test 11
Is there
flame current
present?
Is the
flame rod or
wiring damaged or
broken?
NO
YES
Replace the ignition
module
NO
YES
NO
Is the
flame current
correct?
Check / reset burner
pressure
YES
Is the
flame rod or
wiring damaged or
broken?
NO
YES
NO
Test 12
Is there
voltage to the gas
valve?
YES
Test 13
Is the
resistance of
the gas valve
correct?
Test 14
Is the
gas valve microtemp open
circuit?
NO
NO
NO
YES
Test 14A
Is the
door switch open
circuit?
YES
NO
NO
Replace the igniter
assembly or wiring
Check Burner Earth
YES
Excessive heat roll out is
occurring.
Replace the gas valve
and determine reason
for roll out i.e. poor fluing
Replace the gas valve
(Solenoid failure)
Replace gas valve
(Mechanical Failure)
YES
Is
the model a
631275?
Replace the igniter
assembly or wiring
Replace door switch
Replace the ignition
module
NOTE: Micro-temp failure is due to excessive heat roll out from the combustion chamber.
Common causes are blocked or restricted primary flue, undersized, blocked or restricted
secondary fluing or a flue cowl terminating in a pressurized zone (refer to page 56).
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Component Tests 10 - 12
Test 10
Components will be “live”. Personal
Protective Equipment should be worn
we conducting these tests.
During the ignition trial period using a
multimeter set on the AC volts scale, measure
between the orange wire (“IGN”) and the red
wire (“IGN COM”) terminals on the ignition
module.
The voltage should be between AC140 and
200 volts.
Test 11
Components will be “live”. Personal
Protective Equipment should be worn
we conducting these tests.
The use of flame current test loom part
number 890284 will assist in conducting this
test.
1. Using a multimeter set on the AC microamps scale and wired in series with the
flame rod circuit, measure the flame
current.
A current up to but not exceeding AC10
micro-amps may be detected while flame is
established.
2. Set the multimeter to the DC micro-amps
scale.
A current of approx. DC4.5 micro-amps should
be detected while flame is established.
Test 12
Components will be “live”. Personal
Protective Equipment should be worn
when conducting this test.
Using a multimeter set on the AC volts scale,
measure between the brown wire (“MV”) and
the blue wire (“MV COM”) on the ignition
module while the heater is attempting to light.
Normal voltage from the ignition module is
AC240 volts.
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Component Tests 13 – 14A
Test 13
Isolate power before conducting this
test.
Using a multimeter set on the x20K
resistance scale, measure across the gas
valve terminals.
Normal resistance should be approximately
2.3 kilo-ohms.
A reading of approx 3.1 kilo-ohms indicates
the internal solenoid has failed.
A reading of approx. 8.7 kilo-ohms indicates
the external solenoid has failed
Test 14
Isolate power before conducting this
test.
Note: It will be necessary to strip a small
portion of the heat shrink off the gas valve
wiring to access the micro-temp.
Using a multimeter set on x1 resistance
scale, measure across the micro-temp fitted
in the gas valve wiring.
Normal resistance should be less than 1
ohm.
Test 14A
Isolate power before conducting this
test.
Using a multimeter set on the x1 resistance
scale, measure across the door switch
terminals.
Normal
resistance
with
the
striker
depressed should be less than 1 ohm.
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4 Flashes (Faulty igniter / Igniter sensing circuit) - Chart 5
Isolate power to the heater and
disconnect the multi-pin plug from
the ignition module
Test 15
Is
the resistance
of the igniter
correct?
YES
Replace ignition module
Test 16
Is
the resistance
of the igniter
correct?
Disconnect the igniter wiring from
the wiring loom at the 3 pin plug
NO
YES
Replace the igniter
assembly
Replace the wiring loom
Component Tests 15 - 16
Test 15
62
Isolate power before conducting
this test.
Disconnect the wiring plug from the ignition
module and using a multimeter set on the
x1 resistance scale measure between the
orange wire (“IGN”) and the red wire (“IGN
COM”) of the wiring loom.
Normal resistance should be between 60
and 75 ohms when the igniter is cold.
Test 16
Isolate power before conducting
this test.
Using a multimeter set on the x1 resistance
scale disconnect the 3-pin wiring plug to the
igniter/flame rod assembly and measure
between the outer pins of the 3-pin
connector.
Normal resistance should be between 60
and 75 ohms when the igniter is cold.
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5 Flashes (Flame sensed with gas valve de-energised) - Chart 6
Isolate power to the heater and
disconnect the multi-pin from the
ignition module
Test 17
Is
there a
resistance between
the flame rod and
earth?
YES
Is
the wiring
loom damaged or
burnt?
YES
Replace the wiring loom
Replace the igniter
assembly
NO
NO
Is a
pressure
indicated on the
manometer?
Fit a manometer to the burner
pressure test point
NO
Replace the ignition
module
Refit test point screw at
completion of each test
YES
Is the
pressure
greater than
3.5 kPa?
Fit a manometer to the inlet
pressure test point
NO
YES
Replace the gas valve
Pressure above design
limit of valve.
Refer to installer.
Gas valve may also be
damaged
Component Test 17
Test 17
Isolate power before conducting
this test.
1
H
Using an insulation tester (Megger) set on
the 500 volts scale, disconnect the wiring
plug from the ignition module and conduct
an insulation test between the blue wire
(“FP”) and earth.
TYPE 408
.05 AMPS E20
RE 1/2 PSI 9651
WC(2.5"-5.0")
N. A.
NING 240V
EEP DRY
Repeat the test from the 3-pin wiring plug
to the igniter/flame rod assembly
129508 AD
Normal resistance should be infinity.
6 Flashes – Active and Neutral wiring reversed
• Check for incorrectly wired power point.
• Check for incorrectly wired extension lead.
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7 Flashes (Flame sense circuit failure) - Chart 7
Isolate power to the heater and
disconnect the multi-pin plug from the
ignition module?
Test 17
Is there
a resistance between
the flame rod and
earth?
YES
Is
the wiring
loom damaged or
burnt?
YES
Replace the wiring loom
YES
Repair bracket, straighten flame
rod or replace igniter assembly
NO
Connect a multimeter in series with
the flame rod using the flame current
test loom (890284) and attempt to
relight heater
Is
the flame rod
touching any metal
components?
Check for soot on the flame rod
ceramic - clean or replace the
igniter assembly.
Check for moisture on the wiring
loom and connectors - clean
and dry wiring loom
NO
Test 11
Is a
flame current
detected when burner
lights?
YES
Is
the AC
current greater than
6.5uA?
YES
NO
NO
Replace the ignition module
Test 18
Is
the control module
earthed?
NO
Clean earth connection
Replace damaged or missing
earth wiring
NO
Remove and clean burner
mounting points and refit.
Repeat test 19 to ensure burner
is earthed.
NO
Replace cord set
YES
Test 19
Is
the burner
earthed?
YES
Is
the earth
wire in the cord
intact?
Test 20
Test 2
YES
Is
the GPO
earthed?
NO
YES
TM011 H.S.I Heavy Duty Gas Service Instructions
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Refer job to electrician
Replace the ignition module
37
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Component Tests 18 - 20
Test 18
Isolate
power
conducting this test
before
Using a multimeter set on the x1
resistance scale, measure between
the green/yellow wire (“GND”) on the
ignition module and the base of the
water heater.
Normal resistance should be less
than 1 ohm.
Note: Wiring and plug not shown for clarity
Test 19
Isolate
power
conducting this test
before
Using a multimeter set on the x1
resistance scale, measure between
the burner and the base of the water
heater.
Note: It may be necessary to clean a
section of the burner to ensure
continuity of the multimeter test lead
probe.
Normal resistance should be less
than 1 ohm.
Test 20
Isolate
power
conducting this test
before
Remove the 3-pin plug from the GPO
and using a multimeter set on the x1
resistance scale, measure between
the earth pin of the cord set and the
base of the water heater.
Normal resistance should be less
than 0.5 ohms.
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Flue Damper - 621275 ONLY
The flue damper is screwed to the jacket top of the water heater. The damper consists of
an actuator and butterfly flap that controls the exit of flue gases from the primary flue into
the draught diverter and secondary flue.
When the water heater is on standby
the butterfly flap is closed to prevent
the flow of air up the flue tube. When
the burner is operating the butterfly
flap is open, allowing the free flow of
combustion products from the water
heater to the draught diverter and into
the secondary flue.
NOTE: The butterfly flap is secured in the closed
position with a spring clip at the time of manufacture to
prevent damage during transport and handling. This
clip must be removed during installation. Failure to
remove the spring clip will prevent the water heater
from operating.
Flue Damper Operating Sequence
Damper Closed
When the thermostat contacts ‘TH’ are
open the flue damper is held closed by
power being applied to the damper motor
via contact ‘R1’. Relay contacts ‘R2’ and
the end switch contacts ‘ES’ are open
preventing power from entering the relay or
ignition module circuit.
Damper Open
When the thermostat contacts “TH’ close
power is supplied to the relay coil ‘R’, this
causes contacts ‘R1’ to open cutting power
to the flue damper motor, allowing the
damper to open under spring tension. Once
the flue damper is completely open the end
switch ‘ES’ and the safety switch ‘SS1’
contacts close allowing power to the ignition
module.
Note: Should the ECO thermostat contacts open; the damper will open to allow the water
heater to dissipate the abnormally high temperature quickly. The damper will not close
until the ECO is manually reset.
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Flue Damper Fault Finding - Chart 8
Flue Damper
Is
the flue damper
open?
Test 5
Is
240 volts
being supplied to
the ignition
module?
YES
Test 21
NO
Is
the flue damper fuse
blown?
YES
NO
Check heater internal wiring
for breaks if ok replace the
flue damper
Replace the fuse.
Check power fluing interlock
is wired correctly.
Check gas control, ignition
module and igniter for
electrical failure.
Flue damper ok. Go to
ignition module section
YES
Has the
transit clip been
removed?
NO
NO
Remove transit clip
YES
Test 3
Are the
thermostat contacts
closed?
Test 4
NO
Is the
water temperature
at least 3 degrees
below the set
point?
NO
YES
YES
Test 22
Is
240 volts
being supplied
to the flue
damper?
Flue damper will only open
when thermostat calling for
heat. Refer to thermostat
section for testing the
thermostat
2
Check heater internal wiring
for breaks or loose
connections
NO
YES
Test 23
Is
the relay coil open
circuit?
YES
NO
Observe the relay contacts
Do
the relay
contacts move when
power is
applied?
Replace the flue damper
actuator
NO
YES
Test 24
Is
the flue damper
return spring
broken?
YES
Flue damper seized or not
centered in housing.
Replace the flue damper
assembly
NO
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Component Tests 21 - 23
Test 21
Isolate power before conducting
this test
Using a flat blade screwdriver gently
push and turn the fuse holder counter
clockwise. Release pressure, the fuse
holder will spring partially out.
Remove the fuse holder and using a
multimeter set on the x1 resistance scale
measure across the fuse.
Normal resistance is less than 1 ohm.
Test 22
Components will be “live”. Personal
Protective Equipment should be
worn when conducting this test
Remove the green cover from
the flue damper actuator and using a
multimeter set on the AC volts scale
measure between the brown and blue
wires and between the orange wire
(going directly to the PCB) and blue wire.
Normal voltage for both tests is AC240
volts.
Test 23
Isolate power before conducting
this test
Remove the green cover from the flue
damper actuator and using a multimeter
set on the x1K resistance scale, measure
between the orange wire (going directly
to the PCB) and the blue wire.
Normal resistance is approximately 30
kilo-ohms
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Component Test 24
Test 24
Isolate
power
conducting this test
before
Remove the flue damper actuator
from the flue damper assembly.
Carefully inspect the spring on the
actuator. One tail of the spring should
be engaged in a hole through the
actuator shaft. The other tail of the
spring should be engaged against the
mounting post of the actuator.
Flue Damper Fault Finding - Chart 9
Flue damper
won’t close
Test 25
Is
240 volts
being supplied to the
flue damper
motor?
Check heater internal wiring for
breaks or loose connections
NO
YES
Test 4
Test 26
Are the
thermostat contacts
open?
NO
Is the
water temperature
at or above the set
temperature?
NO
YES
Has
the ECO
tripped?
YES
2
Flue damper will remain open
while ever the thermostat contacts
are closed
Test 7
YES
5
NO
Test 27
Is the
drive motor open
circuit?
YES
Replace the flue damper actuator
1. Butterfly fouled by an
incorrectly installed draught
diverter or secondary flue
2. Replace flue damper
NO
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Component Tests 25 - 27
Test 25
Components will be “live”.
Personal
Protective
Equipment should be worn
when conducting this test
Remove the green cover from the flue
damper actuator and using a
multimeter set on the AC volts scale
measure between the brown and blue
wires.
Normal voltage is AC240 volts.
Test 26
Components will be “live”.
Personal
Protective
Equipment should be worn
when conducting this test.
Using a multimeter set on the AC
volts
scale,
measure
between
terminal 1 (orange wire) and terminal
4 (blue wire) at the thermostat.
Normal voltage when thermostat
contacts are open is AC0 volts
Test 27
Isolate
power
conducting this test
before
Remove the green cover from the flue
damper actuator and using a
multimeter set on the x1K resistance
scale measure between the two blue
wires to the actuator motor.
Normal resistance is approximately
1.6 kilo-ohms.
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Flue Damper - Bypass
In the event the flue damper has failed, and a replacement is not on hand, the water
heater can be wired to operate temporarily with the flue damper bypassed until a
replacement is obtained.
A replacement flue damper should be fitted as a matter of urgency.
To bypass the flue damper electrically so the water heater will operate with it in the open
position use the following procedure and wiring diagrams.
1.
2.
3.
4.
Isolate the power and remove the 3-pin plug from the power point.
Remove the lower access panel.
Disconnect the orange wire from the thermostat. (Refer to Diagram 1 – Point 1)
Disconnect the orange switch wire from the terminal block. (Refer to Diag 1 – Point 2)
5. Disconnect the brown active wire to the flue damper and terminate using a
closed end connector. (Refer to Diagram 1 – Point 3)
6. Run a temporary wire from the thermostat (Refer to diagram 2 – point 4) to the terminal
block (Refer to diagram 2 – point 5)
7. Replace cover and restore power.
Diagram 1
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Diagram 2
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Combustion Fan, Pressure Switch and Relay - 631275 ONLY
The combustion fan, relay (models manufactured before 09/02/05) and pressure switch
are fitted to the 631275 models only, all are located in the fan module mounted in the air
duct at the front of the heater.
The combustion fan provides the primary air under pressure required for successful
combustion. The pressure switch and relay are electrically interlocked to ensure the
combustion fan is running at sufficient speed and pressure before a trial for ignition is
attempted (refer to the following diagrams for sequence of operation).
When the thermostat contacts close power is
supplied to the fan motor and to the relay coil via
the normally closed contact of the pressure switch.
The relay closes 2 sets of contacts. The first set of
contacts latch the relay coil so that power is
maintained to the relay coil when the pressure
switch moves from the normally closed to normally
open position. The second set of contacts close the
circuit to the ignition module, however power is not
available at this stage.
Once sufficient air pressure is achieved the
pressure switch contacts move from the normally
closed to the normally open position, power is then
supplied through the relay contacts to the ignition
module allowing the ignition sequence to
commence. Power is maintained to the relay coil
via the latching circuit.
Fan ‘Run On’
In the event of a very short interruption of power,
known as a “brown out” and usually lasting less
than a second or so, the gas valve, ignition module
and relay all open which results in the burner
extinguishing, however the fan continues to coast,
maintaining enough pressure for the pressure
switch contacts to remain in the normally open
position. When the power is restored the fan
continues to run due to the thermostat being closed
but power is not supplied to the relay coil resulting
in the ignition sequence not restarting. The ignition
module does not indicate a fault code in this event.
631275 models manufactured after the 09/02/05 do not have a relay but utilise a different
ignition module (50A71-178) which eliminates the need for the relay.
This new ignition module utilises an internal method of checking the pressure switch
position (position proving) and also supplies power to the combustion fan thus rendering
the relay and its associated wiring obsolete. For more information refer to the ‘Product
Changes’ section on page 15 and the wiring diagram on page 12.
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Fan Module Fault Finding - Chart 10 (631275 Manufactured Before 09/02/05)
This procedure assumes the
thermostat is calling for heat
and is operational
Fan Module
Test 28
Is
there 240
volts at the fan
module?
Fault in wiring loom
or multi-pin plug.
Locate and rectify
NO
YES
Is
the fan motor
operating?
NO
Test 29
Is the
fan motor open
circuit?
YES
NO
YES
Is the
fan motor running
slow?
YES
Replace fan motor
Test 30
Does
the capacitor
have the correct
capacitance?
YES
NO
NO
Test 31
Are
the pressure
switch contacts
closed?
NO
Is
the pressure
tube blocked or
damaged?
Replace capacitor
YES
Replace pressure
tube
Replace pressure
switch
NO
YES
Test 32
Is
there 240
volts at the relay
coil?
YES
Test 5
Is
there 240
volts at the ignition
module?
YES
Fan module ok. Go
to ignition module
fault finding
NO
NO
Isolate power and
allow fan to stop
Test 33
Does
the pressure
switch reset to the NC
position?
YES
NO
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Replace relay
Replace pressure
switch
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Fan Module Fault Finding - Chart 11 (631275 Manufactured After 09/02/05)
2 Flashes (Pressure Switch Not Open) and 3 Flashes (Pressure Switch Not Closed)
Fan Module
This procedure assumes there
is power to the ignition module
Is the
ignition module
LED flashing
twice?
Test 34
Are
the pressure
switch contacts
open?
YES
NO
NO
YES
Is
the fan
running?
NO
Test 35
Is there
240 volts from
the ignition
module?
YES
Replace ignition module
NO
Replace ignition module
Test 28
Is
there 240
volts at the fan
motor?
YES
Replace pressure switch
NO
Fault in wiring loom or
multi pin plug. Locate
and rectify
YES
Replace fan motor
YES
Test 29
Is the
fan motor open
circuit?
Is the
fan running
slow?
YES
NO
NO
Is the
ignition module
LED flashing three
times?
Test 30
Does
the capacitor
have the correct
capacitance?
NO
YES
NO
Test 34
Does
the pressure
switch reset to the
NO position?
Isolate power and
allow fan to stop
Replace fan motor
Replace capacitor
YES
Restart heater, if heater
fails to light commence
fault finding from chart 1
YES
NO
Replace pressure switch
Test 36
Is
the pressure
switch contact
closed?
Is
the pressure
tube blocked or
damaged?
NO
YES
NO
YES
TM011 H.S.I Heavy Duty Gas Service Instructions
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Replace pressure tube
Replace pressure switch
Replace ignition module
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Component Tests 28 – 30
NOTE: In order to conduct tests 28 - 30 the fan module should be removed from the air
duct and placed on a stable work area.
WARNING: Whilst conducting test 28 the fan motor may be rotating, ensure loose
clothing and hands are kept well clear of the fan blade.
Test 28
Components will be “live”. Personal
Protective Equipment should be
worn when conducting this test
Note: The thermostat must be calling for
heat to conduct this test. To prevent the
burner commencing operation disconnect
and insulate the wiring to the gas valve
Using a multimeter set on the AC volts
scale, measure between the orange wire
(pre 09/02/05) or brown wire (post
09/02/05) and the blue wire at the fan
module unit.
Normal voltage is AC240V
Test 29
Isolate power before conducting
this test.
Pre 9/2/05 Models: Remove the relay
from the relay base
Using a multimeter set on the x1
resistance scale, measure between the
blue wire and the brown wire and between
the blue wire and the black wire to the fan
motor.
Normal resistance is:
Blue – Brown 222 ohms
Blue – Black 218 ohms
Test 30
Isolate power before conducting
this test.
Disconnect the brown wire from the fan
motor to the capacitor. Using a multimeter
set on the capacitance scale, measure
between the 2 white leads of the capacitor.
Normal reading is 2 micro-farads
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Component Tests 31 – 33
NOTE: In order to conduct tests 31 - 32 the fan module should be removed from the air
duct and placed on a stable work area.
WARNING: Whilst conducting tests 31 and 32 the fan motor may be rotating, ensure
loose clothing and hands are kept well clear of the fan blade.
Test 31
Components will be “live”. Personal
Protective Equipment should be
worn when conducting this test
Note: The thermostat must be calling for
heat to conduct this test.
To prevent the burner commencing
operation disconnect and insulate the
wiring to the gas valve
Using a multimeter set on the AC volts
scale, measure between the black wire on
the micro-switch and the blue wire on the
relay base.
Normal voltage is AC240V
Test 32
Components will be “live”. Personal
Protective Equipment should be
worn when conducting this test
Note: The thermostat must be calling for
heat to conduct this test.
To prevent the burner commencing
operation, disconnect and insulate the
wiring to the gas valve.
‘
Using a multimeter set on the AC volts
scale, measure between the brown and
blue wires on the relay base.
Normal voltage is AC240 volts.
Test 33
Isolate power before conducting
this test.
Note: Wait for the fan to stop before
conducting this test.
Using a multimeter set on the x1 resistance
scale, measure between the red and brown
wires on the micro-switch.
Normal resistance should be less than 1
ohm.
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Component Tests 34 – 36
NOTE: It is not necessary to remove the fan module from the air duct to conduct tests 34 –
36 however if the module has been removed to conduct previous tests observe the
warning below.
WARNING: Whilst conducting tests 35 and 36 the fan motor will be rotating, ensure
loose clothing and hands are kept well clear of the fan blade.
Test 34
Isolate power before conducting
this test.
Note: Wait for the fan to stop before
conducting this test.
Using a multimeter set on the x1 resistance
scale, measure between terminals PSO
and PSI on the ignition module.
Normal resistance should be infinity ohms.
Test 35
Components will be “live”. Personal
Protective Equipment should be worn
when conducting this test
Note: The thermostat must be calling for
heat to conduct this test. Using a
multimeter set on the AC volts scale,
measure between the IND and IND COM
terminals on the ignition module.
Normal voltage is AC240 volts.
Test 36
Components will be “live”. Personal
Protective Equipment should be worn
when conducting this test
Note: The thermostat must be calling for
heat and the fan running to conduct this
test. Using a multimeter set on the AC volts
scale, measure between the PSI and Line
COM terminals on the ignition module.
Normal voltage is AC240 volts.
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Fault Finding (No error code / No Operation) – Chart 12
In order for the burner to operate and fault codes to be displayed the ignition module must
be receiving voltage, where a heater is not operational and the ignition module does not
display a fault code it will be necessary to determine if the ignition module is receiving
power.
Burner not operating
No fault code on ignition module
Is there
a display on the
thermostat?
NO
1.1
Refer to
Chart 1
2
Refer to
Chart 3
YES
Test 3
Are
the thermostat
contacts closed?
NO
YES
631275
NO
621275
621265
631265
NO
YES
YES
Is
a power flue
fitted?
YES
1.2
YES
Refer to flue damper section Chart 8
NO
50A72-178
ignition module fitted
NO
Refer to
Chart 1
50A72-208
or
50A72-298
ignition module fitted
YES
Is
the combustion fan
running?
NO
YES
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YES
Refer to section on fan ‘run on’
and Chart 10
Refer to ‘fan module’ section
(models manufactured before
09/02/05)
Refer to
Chart 10
Refer to ‘fan module’ section
(models manufactured after
09/02/05)
Refer to
Chart 11
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Fault Finding (Intermittent Operation) - Chart 13
3
Outdoor
Models Only
Is the heater installed
against an external
wall?
NO
The balanced flue terminal will not
operate correctly unless the heater is
installed against an external wall.
Refer to ‘Fluing’ section
Reposition the heater against an
external wall or install a barrier behind
the heater extending 500mm either
side and above the height of the
heater
Indoor Models Only
Refer to ‘Fluing’ section
Is the flue cowl
terminating in a
pressurized zone?
YES
Pressurized zones can cause heat
roll out from the combustion chamber
resulting in gas valve failures
Extend or relocate the flue to ensure
free air can pass across the cowl
Has
the water heater
been delivering
excessively hot
water?
YES
The thermostat may be incorrectly
programmed causing the ECO to trip
5
Most intermittent faults can generally be traced to
1. Poor or intermittent power supply
2. Insufficient dynamic inlet gas pressure
3. Poor secondary fluing, in particular cowls
terminating in pressure zones
4. Incorrect heater position
NO
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Chart 15
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Fault Finding (Insufficient Hot Water) - Chart 14
4
Is
the T&PR
valve continuously
discharging
water?
YES
Existing pressure limiting valve faulty
Replace
Is the water
supply pressure above
800kPa?
YES
Fit a pressure limiting valve if not
already installed
NO
Refer to specifications table
Replace the T&PR valve with one of
the correct pressure rating
Is
the correct T&PR valve
fitted?
NO
NO
Do NOT use reconditioned T&PR
valves
YES
Does
the water
temperature correspond
with the thermostat
display?
NO
Refer to thermostat section
NO
Replace injector with one suitable for
the model and gas type
NO
Replace the baffle
YES
Refer to specifications table
Is the
main burner
injector the correct
size?
YES
Refer to specifications table
Is
the correct baffle
fitted?
YES
Check manifolding (refer to common
faults section)
Does
the installation
consist of multiple
heaters?
YES
Check building return circulator for
correct operation
Heater possibly undersized
NO
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Check if a temporary failure of gas or
electricity occurred
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Fault Finding (Water Too Hot) - Chart 15
5
Does
the water
temperature correspond
with the thermostat
display?
Is
the set point 82
degrees?
NO
YES
A circulator must be fitted for
settings above 80 degrees
Is
a circulator
fitted?
NO
Refer to installer
NO
YES
YES
Reprogram parameters
(Refer to ‘Thermostat Parameters’
in the Electronic Thermostat
Adjustment section
Refer to thermostat fault finding
section
Are
the thermostat
parameters set
correctly?
NO
YES
Refer to specifications table
Is
the main
burner injector the
correct size?
Replace injector with one suitable
for the model and gas type
NO
YES
YES
Refer to specifications table
Is
the correct baffle
fitted?
NO
Replace the baffle
YES
Refer to specifications table
or rating label
Is
the burner pressure
correct?
NO
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Reset the burner pressure
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Fault Finding (Leaking Water Heater) - Chart 16
6
Is
the water leak
intermittent?
Leak may be condensate formed in the
combustion chamber during the heating
cycle.
Large quantities of condensate can be
produced during cold weather or after
large draw offs.
May also be evident on initial lighting
Normal Operation
YES
NO
Is
the T&PR valve
continuously discharging
water?
Is
the water supply
pressure above
1120kPa?
YES
Existing pressure limiting valve faulty
Replace
YES
Fit a pressure limiting valve if not already
fitted
NO
Is
the correct T&PR valve
fitted?
NO
Replace the T&PR valve with one of the
correct pressure rating
Do NOT use reconditioned T&PR valves
YES
NO
Is
the water
temperature above
85 degrees?
Check for crossed water connection
NO
Replace the T&PR valve
YES
Is
an anode
leaking?
NO
Is
a temperature
sensor sheath
leaking?
Remove the anode and repair leak using
Teflon thread tape
YES
WARNING:
Water under pressure and at temperatures up to 82
degrees may be present
Isolate water supply to water heater and relieve
pressure through a hot tap prior to removing fittings
YES
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Leaking thread:
Remove sheath and repair using Teflon
thread tape
Leaking through sheath:
Replace sheath
Inner cylinder may be leaking
Check for sounds of hissing water onto
flue lining
Replace water heater
NO
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Fluing Principals
Indoor Models
Reverse flow (down draught) in the flue occurs when pressure at the flue outlet (cowl) is
greater than that inside the water heater.
In this condition, flue gases are discharged through the draught diverter into the room
where the water heater is located. This is of no consequence where occasional wind
conditions may cause small intermittent discharge, however in severe conditions excessive
down draught can cause flame roll out from the combustion chamber, burner outage and
sooting.
The location of the flue cowl is critical to the correct operation of the flue system. The
diagrams below detail the correct and incorrect location of the flue outlet. In many cases
the position of the flue cowl is a major contributor to repeated component failure i.e. the
gas valve or the unreliable operation of the water heater generally.
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Power Fluing / Mechanical Ventilation
Where a fan is used to assist with the fluing
(power fluing) or to provide sufficient primary
air for combustion (mechanical ventilation)
the fan must be electrically interlocked with
the water heater(s) to prevent ignition in the
event the fan fails.
This is generally done by the use of a
contactor (relay) and a sail or pressure
switch mounted in the flue to detect airflow.
The diagrams opposite and below detail one
method for interlocking a power flue system
to the water heater(s), mechanical ventilation
systems would also be wired in a similar
manner.
.
24 hour Fan Operation
Where multiple water heaters are installed each individual water heater must be
interlocked with the fan system. The diagrams below detail a common method of
interlocking multiple water heaters to a power flue system
Intermittent Fan Operation
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Outdoor models
In practice it is almost impossible to achieve exact balance between the pressure on the
air inlet and flue outlet of a balanced flue terminal.
In order to avoid the possibility of reverse fluing the flue terminal design is always biased
to provide slightly higher pressure on the air inlet. The flue terminal on outdoor water
heaters has the air inlet towards the rear.
When the water heater is installed against an external wall, the pressure zone created by
any wind will produce the required pressure imbalance for the flue terminal to operate
correctly.
If the water heater is not installed against a wall, the pressures at the air inlet and flue
outlet become unpredictable, resulting in the combustion system not operating correctly.
Specifically, there may be flame roll out from the combustion chamber, flame lift off from
the burner, sooting of the primary flue and flue terminal and/or flame failure problems.
Below are examples of the correct and incorrect installation of an outdoor water heater.
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Component Replacement
WARNING
H.S.I models are fitted with a 3 plug. All procedures relating to replacement of
electrical components assume removal of the plug from the GPO will safely isolate
the appliance electrically
HOWEVER where ancillary equipment, such as a power flue, has been electrically
interlocked with the water heater or the water heater has been hard wired extreme
caution must be exercised to ensure ‘live’ conductors are not present from the
additional circuit(s)
It is strongly recommended that the power supply to all ancillary equipment is also
isolated when servicing any water heater electrically interlocked to it
Personal Protective Equipment should be worn to reduce the risk of electric shock
Refer to Rheem Safety Procedure on electrical testing
Draining the Water Heater (Procedure 1)
Elevated temperatures may be present during the draining process. Personal
Protective Equipment should be worn to prevent the risk of scalding
1. Remove 3-pin plug from GPO and isolate the gas and water supplies to the water
heater
2. Relieve pressure from the water heater through T & PR valve or a hot tap
3. Fit a drain hose to the drain cock outlet and run the other end to a drain or safe location
4. Open the drain cock
5. Open the temperature and pressure relief valve to allow air into the system
Gas Control Replacement (Procedure 2)
1. Remove 3-pin plug from GPO & isolate gas supply to heater (note warning
above)
2. Outdoor Models - Remove the lower access door
Indoor Models - Remove the gas valve cover Note: It will be necessary to disconnect
the wiring to the thermostat, temperature sensor and ignition module to allow complete
removal of the gas valve cover
3. Disconnect the wiring from the ignition module to the gas valve terminal block, noting
the positions of each wire.
4. Disconnect the inlet gas pipe work
5. Disconnect the burner feed pipe
6. Remove the screw retaining the gas valve to the support bracket
7. Remove the gas valve
8. Reassemble in the reverse order of above. Note: On indoor models ensure the lip on
the bottom of the gas control cover engages inside the jacket opening
9. Restore gas and test all inlet gas connections for leaks using soapy water solution
10. Restore power
11. Allow heater to light and test all outlet gas connections for leaks using soapy water
solution. NOTE: On the 631275 it will be necessary to hold the door switch closed
while conducting the leak test
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Burner Replacement (Procedure 3)
1. Remove 3-pin plug from GPO & isolate gas supply to heater (note warning on
page 59)
2. Outdoor Models - Remove the lower access door
Indoor Models - Remove the gas valve cover Note: It will be necessary to disconnect
the wiring to the thermostat, temperature sensor and ignition module to allow complete
removal of the gas valve cover
3. Outdoor models - Remove the burner access panel Note: On 631275 models it will be
necessary to disconnect the wiring to the door switch to remove the cover
4. Disconnect the burner feed pipe at the gas control
5. Disconnect the wiring to the igniter and flame sensor rod at the 3-pin connector plug
6. 275 models - Remove the heat shield (3 screws) located at the top of the combustion
chamber opening and the 2 screws retaining the injector bracket to the burner, the
burner feed pipe assembly can now be removed
7. Remove screws retaining the burner to the water heater jacket
8. Carefully withdraw the burner ensuring the flame sensor rod and igniter is not
damaged
9. Remove the igniter and heat shield assembly from the old burner
10. Reassemble in reverse order of above. Note: Care must be taken to ensure that the
igniter wiring heat shield is fitted correctly when fitting the igniter to the new burner, the
flame rod and hot surface igniter must not be touched with bare hands
11. Restore gas and test all inlet gas connections for leaks using soapy water solution
12. Allow heater to light and test all outlet gas connections from leaks using soapy water
solution. NOTE: On the 631275 it will be necessary to hold the door switch closed
while conducting the leak test
Main Burner Injector Replacement (Procedure 4)
1. Follow Procedure 3 (Burner Replacement) to step 7
265 Models
2. Remove the screws retaining the burner to the jacket and withdraw the burner slightly
3. Remove the spring clip and remove the burner feed pipe assembly from the burner
bracket
275 Models
2. Remove the 2 screws retaining the injector bracket to the burner
3. Remove the burner feed pipe assembly
Both
4. Remove the injector from the burner feed pipe
5. Fit the replacement injector using an approved gas sealant. Note: Sealant should be
used sparingly to prevent blockage of the injector
6. Reassemble in reverse order of above. Note: On indoor models ensure the lip on the
bottom of the gas control cover engages inside the jacket opening
7. Allow heater to light and test all outlet gas connections from leaks using soapy water
solution. NOTE: On the 631275 it will be necessary to hold the door switch closed
while conducting the leak test
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Igniter/Flame Rod replacement (Procedure 5)
Use Procedure 3 (Burner Replacement)
Ignition Module Replacement (Procedure 6)
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Outdoor Models - Remove the lower access door
Indoor Models - Remove the gas valve cover Note: It will be necessary to disconnect
the wiring to the thermostat, temperature sensor and ignition module to allow complete
removal of the gas valve cover
3. Outdoor Models - Disconnect the multi-pin plug at the ignition module
4. Remove the ignition module (2 screws on outdoor models, retaining tabs on indoor
models)
5. Reassembly in reverse order of above
Note:
Outdoor Models - The moisture shield must be refitted to the ignition module
Indoor Models - Ensure the lip on the bottom of the gas control cover engages inside
the jacket opening
6. Restore power and test operation
Thermostat Replacement (Procedure 7)
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Indoor Models - Remove the gas valve cover Note: It will be necessary to disconnect
the wiring to the thermostat, temperature sensor and ignition module to allow complete
removal of the gas valve cover
Outdoor Models - Remove the upper access cover and disconnect the power supply
and sensor multi-pin connectors to the thermostat
3. Remove the thermostat retainers from the left and right sides of the thermostat by
pressing on the centre lug and sliding the retainer towards the rear of the thermostat
Note: On outdoor models it may be necessary to remove the rain shield to provide
easier access to the retainers
4. Remove the thermostat
5. Slide the replacement thermostat into place ensuring the sealing gasket has no twists
6. Reassemble in the reverse order of above. Note: On indoor models ensure the lip on
the bottom of the gas control cover engages inside the jacket opening
7. Restore power, adjust the set point and check the thermostat parameters are set
correctly (refer to the ‘Electronic Thermostat Adjustment’ section on page 25
Flue Terminal Replacement (Procedure 8)
1.
2.
3.
4.
5.
Remove 3-pin plug from GPO (note warning on page 59)
Remove the screws holding the flue terminal to the air duct.
Remove the flue terminal.
Reassemble in reverse order of above.
Refit the access door.
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Temperature Sensor Replacement (Procedure 9)
The temperature sensors must be replaced as a set
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Outdoor Models - Remove the upper access door; disconnect the power supply and
sensor multi-pin connectors to the thermostat. Remove the lower access door.
Indoor Models - Remove the gas valve cover Note: It will be necessary to disconnect
the wiring to the thermostat, temperature sensor and ignition module to allow complete
removal of the gas valve cover
3. Indoor and Outdoor models - Remove the upper and lower electrical covers
4. Remove the temperature sensors from each sheath
5. Outdoor models - Withdraw the cold sensor from the conduit
Indoor models - Withdraw the hot sensor from the conduit
Note: Attaching a draw wire to the sensor will assist in drawing the replacement sensor
through the conduit
6. Outdoor models – Fit the replacement cold sensor (blue band on insulation) through
the conduit
Indoor models – Fit the replacement hot sensor (red band on insulation) through the
conduit
7. Insert the temperature sensors into each sheath. Note: Ensure the temperature sensor
is reinserted all the way to the end of the sheath, the opening should be sealed with
silicone to prevent the sensor moving
8. Complete reassembly in reverse order of above
9. Restore power, test operation and ensure displayed water temperature and actual
water temperature match.
Temperature Sensor Sheath Replacement (Procedure 10)
1. Remove 3-pin plug from GPO and isolate the water supply to the water heater
(note warning on page 59)
2. Relieve pressure from the water heater through T&PR valve or a hot tap
3. Drain the water heater (Refer to Procedure 1)
4. Outdoor models - Remove the upper or lower access cover depending on which
sheath is to be accessed. Note: If removing the upper access cover disconnect the
power supply and sensor multi-pin connectors to the thermostat
5. Indoor and Outdoor models – Remove the upper or lower electrical cover depending
on which sheath is to be accessed
6. Remove the temperature sensor
7. Using a 27mm socket, remove the sheath
8. Apply thread-sealing tape to the sheath thread and tighten
9. Refill the water heater, ensure air is purged from cylinder and pipe work.
10. Check for leaks
11. Reassemble in reverse order of above Note: Ensure the temperature sensor is
reinserted all the way to the end of the sheath, the opening should be sealed with
silicone to prevent the sensor moving
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Limit Thermostat Replacement (Procedure 11)
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Outdoor Models - Remove the lower access door
Indoor and Outdoor models - Remove the lower electrical cover
Note: The limit thermostat can be reset by pressing the small button in the centre of
the terminals, replacement may not be necessary
3. Disconnect wiring to the limit thermostat
4. Remove the screw retaining the limit thermostat to the bracket and remove the
thermostat
5. Reassemble in the reverse order of above
6. Restore power and test operation
Anode Inspection or Replacement (Procedure 12)
H.S.I heavy duty models are fitted with 3 anodes
1. Remove 3-pin plug from GPO & isolate water supply to heater (note warning on
page 59)
2. Relieve pressure through a hot tap or the T&PR valve.
3. Outdoor models - Remove screws from the jacket top and from top of front air duct and
remove the jacket top, air duct and flue terminal assembly.
Indoor models - Disengage the flue, remove screws from the jacket top and remove
the jacket top, draught diverter and flue damper (if fitted) assembly
4. Using a 27mm tube or socket spanner, unscrew and remove the anode(s).
5. Apply thread sealing tape to anode(s) thread, refit and tighten.
6. Restore water supply and check for leaks.
7. Complete reassembly in reverse order of above
8. Restore power and water supplies
Temperature & Pressure Relief Valve Replacement (Procedure 13)
Never fit a T&PR valve with a rating higher than that indicated on the water
heater rating label. Do not use reconditioned T&PR valves
1. Remove 3-pin plug from GPO & isolate water supply to heater (note warning on
page 59)
2. Relieve pressure from the water heater through the T&PR valve or a hot tap
3. Remove the drain line from the T&PR valve
4. Unscrew the T&PR valve and remove
A quantity of hot water will discharge from the tank during this process. Personal
Protective Equipment should be worn to prevent scalds or burns
5. Confirm the replacement T&PR valve is the correct rating and refit using thread tape
6. Refit the drain line
7. Close the hot tap and restore water supply
8. Check T&PR valve thread for leaks
9. Operate the T&PR valve lever to reset relief drain
10. Purge air from the system through hot taps
11. Restore power and water supplies
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Dip Tube Replacement (Procedure 14)
1. Remove 3-pin plug from GPO & isolate water supply to heater (note warning on
page 59)
2. Relieve pressure from the water heater through the T&PR valve or a hot tap.
3. Disconnect the hot water line from the outlet of the water heater.
A quantity of hot water will discharge from the outlet during this process.
Personal Protective Equipment should be worn to prevent scalds or burns.
4. Using a flat blade screwdriver gently split the outer rim at the top and bottom of the dip
tube face and prise the dip tube out of the cylinder fitting.
5. Fit the replacement dip tube into the cylinder fitting ensuring the flat lines up with the
fitting (dip tube facing up) and gently drive the dip tube into the fitting a short distance.
6. Apply thread tape to the plumbing fitting and refit; this will push the dip tube into the
correct location.
7. Reconnect the hot water line and restore the water supply.
8. Purge air from the system through hot taps.
9. Restore the power.
Components Specific to 621275
Flue Damper Assembly Replacement (Procedure 15)
NOTE: A blown fuse in the flue damper does NOT indicate a fault with the damper. The
fault may be with the ignition module, gas valve, thermostat or damaged wiring.
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Remove the upper and lower electrical covers
3. Disconnect the wiring to the flue damper (lower electrical opening) and attach a draw
wire. Note wiring connections for reconnection of the replacement flue damper wiring.
4. Withdraw the wiring loom out of the conduit at the upper electrical opening
5. Withdraw the wiring loom up through the jacket top. Note: It may be necessary to open
up the insulation between the upper electrical opening and the jacket top to allow the
wiring to pass through
6. Disengage the flue and remove the draught diverter
7. Remove the screws holding the flue damper assembly to the jacket top and remove
damper assembly
8. Reassemble in reverse order of above
9. Restore power and test operation
Flue Damper Actuator Replacement (Procedure 16)
1. Follow Procedure 15 (Flue Damper Assembly Replacement) to step 5
2. Remove the screws holding the actuator to the flue damper assembly and remove the
actuator
3. Reassemble in reverse order of above. Note: Ensure the butterfly shaft engages the
actuator shaft correctly when refitting the actuator. The butterfly should be in the open
position
4. Restore power and test operation
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Components Specific to 631275
The fan motor, capacitor, relay, relay base, pressure switch and impulse tube all form part
of the ‘fan module’ assembly which is mounted in the air duct assembly at the front of the
heater.
Pressure Switch Replacement (Procedure 17)
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Remove the upper access door and disconnect the power supply and sensor multi-pin
connectors to the thermostat
3. Remove the fan module wiring cover (1 screw) Note: Access the fan module wiring
cover through the upper opening in the air duct
4. Disconnect the wiring from the pressure switch. Note position of wiring connections for
reconnection of replacement pressure switch
5. Remove retaining screws (2), withdraw the pressure impulse tube from the fan
chamber and remove the pressure switch
6. Remove the pressure impulse tube and inspect for splits or damage. If undamaged fit
to the replacement pressure switch ensuring the tube is on the correct side
7. Reassemble in reverse order of above. Note: Ensure the pressure impulse tube is
reinserted into the fan chamber and there are no kinks in the hose
8. Restore power and test operation
Impulse Tube Replacement (Procedure 18)
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Remove the upper access door and disconnect the power supply and sensor multi-pin
connectors to the thermostat
3. Remove the fan module wiring cover (1 screw) Note: Access the fan module wiring
cover through the upper opening in the air duct
4. Disconnect the tube from the pressure switch and withdraw from the fan chamber
5. Reassemble in reverse order of above. Note: Ensure the pressure impulse tube is
reinserted into the fan chamber and there are no kinks in the hose
6. Restore power and test operation
Relay Base Replacement (Procedure 19)
1. Follow Procedure 21 (Fan Motor Replacement) to step 6
2. Remove the fan module wiring cover (1 screw)
3. Disconnect the wiring from the relay base. Note position of wiring connections for
reconnection of replacement base
4. Remove retaining screws (2) and remove the relay base
5. Reassemble in reverse order of above. Note: When refitting the air duct a bead of
silicone MUST be applied to both edges where the air duct engages the heater jacket
to prevent water ingress
6. Restore power and test operation
TM011 H.S.I Heavy Duty Gas Service Instructions
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Relay Replacement (Procedure 20)
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Remove the upper access door and disconnect the power supply and sensor multi-pin
connectors to the thermostat
3. Remove the fan module wiring cover (1 screw) Note: Access the fan module wiring
cover through the upper opening in the air duct
4. Unplug the relay from the base
5. Reassemble in reverse order of above
6. Restore power and test operation
Fan Motor Replacement (Procedure 21)
1. Remove 3-pin plug from GPO (note warning on page 59)
2. Remove the lower access door
3. Disconnect wiring to ignition module and the door switch
4. Remove the upper access door and disconnect the power supply and sensor multi-pin
connectors to the thermostat
5. Remove screws securing the air duct. Note: It is not necessary to remove the screws
around the base of the air duct or the screw securing the cord bracket to the jacket
6. Pull the air duct out at the bottom then slide down to disengage from the top air duct.
Note: The air duct is sealed to the heater jacket using silicone; care should be taken
not to damage the air duct when breaking the silicone seal
7. Remove the 4 screws (2 at the front and 1 on each side of the air duct) and remove the
fan module. Note: Support the fan module when removing the screws to prevent it
falling and being damaged
8. Remove the fan module wiring cover (1 screw) and disconnect the fan motor wiring.
Note position of wiring connections for reconnection of replacement motor
9. Remove the fan motor support bracket (4 screws)
10. Remove the fan motor from the bracket (4 screws)
11. Reassemble in reverse order of above. Note: When refitting the air duct a bead of
silicone MUST be applied to both edges where the air duct engages the heater jacket
to prevent water ingress
12. Restore power and test operation
Capacitor Replacement (Procedure 22)
1. Follow Procedure 21 (Fan Motor Replacement) to step 6
2. Remove the fan module wiring cover (1 screw)
3. Disconnect the capacitor wiring. Note position of wiring connections for reconnection of
replacement capacitor
4. Undo the retaining nut and remove the capacitor
5. Reassemble in reverse order of above. Note: When refitting the air duct a bead of
silicone MUST be applied to both edges where the air duct engages the heater jacket
to prevent water ingress
6. Restore power and test operation
TM011 H.S.I Heavy Duty Gas Service Instructions
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
621265 Exploded View
1
3
4
8
2
5
14
9
15
10
16
11
12
14
13
19
17
29
32
10
30
25
12
26
24
18
27
21
20
6
28
22
7
23
31
TM011 H.S.I Heavy Duty Gas Service Instructions
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Replacement Parts List – 621265
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
NI
Description
Draught diverter
Flue baffle
Foam Cover
Jacket top
Name band
Jacket base
Foot
Black
Anode
Blue
Green
Dip tube
Pipe Seal – Inlet & Outlet
Fitting Liner (¾” Noryl)
Pipe Seal (¾” x 31)
T & PR valve
Temperature sensor adaptor probe
Sensor Set
Electrics front cover upper
Fitting Liner – Inlet (1¼” x 26)
Cover Gas control
Electrics front cover lower
Control module
Gasket
Window
Window clamp
Drain cock
Terminal block BP 4 Way
Grommet
ECO thermostat – manual reset
Bracket – Thermostat Mount
Bracket – ECO Mount
Fitting Liner (¾”)
Cord set
Electronic thermostat
Wiring assembly – electronic thermostat
Wiring loom
Bridging Wire
ECO Wire
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
This document is stored and maintained electronically by
Part Number
108113
108189
221735
101217-1
120629
108158-1
108107
221914
221924
222014
220511
221406-1
229460
221358-1
220604
079427
890280
100704-1
229450
108354
100701-1
079612
087016
080016
108258
224813
051602
080122
053008
108135
108177
221001
053001
890279
052922
052927
052723
052930
68
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
631265 Exploded View
1
36
2
3
14
6
31
11
7
40
8
23
9
22
14
10
25
16
11
24
39
7
26
38
12
20
37
34
21
13
19
35
17
9
18
4
32
5
30
39
27
29
38
33
28
37
TM011 H.S.I Heavy Duty Gas Service Instructions
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Replacement Parts List – 631265
Item
1
Description
Foam Cover
Black
Blue
Green
2
Anode x 3
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Jacket top
Jacket base
Foot
Dip tube
Pipe Seal – Inlet & Outlet
Fitting Liner (¾” Noryl)
Pipe Seal (¾” x 31)
T & PR valve
Fitting Liner – Inlet (1¼” x 26)
Fitting Liner (¾”)
Drain cock
Temperature sensor adaptor probe
Sensor Set
Electrics front cover - lower
Bracket – Thermostat Mount
Bracket – ECO Mount
ECO thermostat – manual reset
Terminal block BP 3 Way
Grommet
Air duct
Name strip
Access panel upper
Thermostat Rain Shield
Electronic thermostat
Lower Access Door
Burner access panel
Air duct base
Grommet (17ID x 47)
Air duct top
Cord clamp
Cord set
Rain Guard – ignition module
Control module
Flue terminal assembly
Gasket
Window
Window clamp
Electrics front cover upper
Wiring assembly – electronic thermostat
Wiring loom
Wire ECO
NI
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
This document is stored and maintained electronically by
Part Number
221735
221914
221924
222014
101217-1
108158-1
108107
220511
221406-1
229460
221358-1
220604
229450
221001
224813
079427
890280
100701-1
108135
108177
053008
051601
080122
108090-1
120806
108268
108269
890279
104599-1
108352-1
108204
080063
108172-1
053003
053001
108266
079612
108164-1
087016
080016
108258
100704-1
052923
052927
052930
70
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Burner Assembly Exploded View – 265L
3
2
4
5
1
13
6
12
11
10
7
9
8
Replacement Burner Parts List – 265L
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
Description
Burner assembly
Igniter holder
H.S.I igniter and flame probe
Gas control bracket
Regulator Spring - Propane / Butane
Regulator Spring - Natural / TLP
Gas valve – White Rogers
Burner Feed Pipe
Test point spigot
Rivet
Support Brace
Spring Clip
Natural Gas
Propane Gas
Main burner injector
TLP Gas
Butane Gas
Cord clamp
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
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Part Numbers
074453
145403
071420
108000
079520
079530
079500
079510
079506
088009
108133
088003
073502
073503
073501
073504
053003
71
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
621275 Exploded View
1
2
3 -4
23
6
9
5
7
15
16
10
11
17
30
12
13
15
14
32
18
19
11
33
22
34
12
27
24
25
29
28
20
8
21
17
26
31
TM011 H.S.I Heavy Duty Gas Service Instructions
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Replacement Parts List – 621275
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
NI
Description
Draught diverter adapter
Draught diverter
Flue damper complete
Flue damper actuator
Flue baffle
Jacket top
Name band
Jacket bottom
Black
Anode
Blue
Green
Dip tube
Pipe seal – inlet & outlet
Pipe seal (¾” x 31)
Fitting Liner (¾” Noryl)
T & PR valve
Temperature sensor adapter probe
Temperature Sensor set
Electrics front cover upper & lower
Terminal Block – BP 4 way
ECO Thermostat – Manual Reset
Bracket – ECO Mount
Bracket – Thermostat Mount
Fitting liner - Inlet
Flue damper fuse
Fitting liner (¾”)
Drain cock
Foot
Heat Shield
Gas control cover
Ignition module
Thermostat
Cord set
Gasket – Viewing window
Window Insert
Clamp plate – sight glass
Wiring loom
Wiring assembly - electronic thermostat
Wire - ECO
Bridging wire
Cover – Foam
Part Number
147502
108145
053045
890160
108154
140316-1
120629
108152-1
221914
221924
222014
220511
221406-1
221358-1
229460
220604
079427
890280
100701-1
051602
053008
108177
108135
229450
890305
221005
224813
108107
108603
108355
079612
890279
053001
087016
080016
108258
052927
052924
052930
052723
221735
* NI – Not illustrated
TM011 H.S.I Heavy Duty Gas Service Instructions
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631275 Exploded View - Heater
3
1
4
15
2
12
7
8
9
10
17
13
12
11
14
8
25
23
19
20
16
14
24
18
22
5
21
6
TM011 H.S.I Heavy Duty Gas Service Instructions
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Replacement Parts List – 631275 (Heater)
Item
1
Description
Part Number
Black
Blue
Green
2
Anode
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Cover – Foam
Jacket top
Jacket bottom
Foot
Dip tube
Pipe seal – inlet & outlet
Pipe seal (¾” x 31)
Fitting Liner (¾” Noryl)
T & PR valve
Temperature sensor adapter probe
Temperature Sensor set
Electrics front cover upper & lower
Flue baffle
Fitting liner (¾”)
Fitting liner - Inlet
Pipe seal (¾” x 31)
Drain cock
Bracket – Thermostat Mount
Bracket – ECO Mount
ECO Thermostat – Manual Reset
Terminal block – BP 3 Way
Grommet
Heat shield assembly - burner
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
This document is stored and maintained electronically by
221914
221924
222014
221735
140316-1
108152-1
108107
220511
221406-1
221358-1
229460
220604
079427
890280
100701-1
108154
221005
229450
221358-1
224813
108135
108177
053008
051601
080122
108603
75
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
631275 Exploded View – Air Duct & Flue Terminal
1
28
20
25
23
3
24
2
6
21
4
27
26
29
5
18
14
13
19
12
8
16
10
17
15
7
14
9
13
12
TM011 H.S.I Heavy Duty Gas Service Instructions
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Replacement Parts List – 631275 (Air Duct & Flue Terminal)
Item
1
2
3
4
5
6
7
8
NI
9
10
12
13
14
15
16
17
18
19
20
21
23
24
NI
25
26
27
28
29
NI
Description
Flue Terminal assembly
Air duct
Name strip
Access Cover - upper
Thermostat
Thermostat - Rain Shield
Access cover - lower
Door switch
Switch insulator
Burner access panel
Grommet (17ID x 47)
Gasket – Viewing window
Window Insert
Clamp plate – sight glass
Air duct base
Air duct plate
Cord set
Rain Guard – Ignition Module
Part Number
108249
108092-1
120806
108268
890279
108269
104599-1
054056
079405
108346-1
080063
087016
080016
108258
108222
108179-1
053001
108266
Ignition module
Fan box
Fan motor
Mounting bracket relay
Pressure switch
Pressure impulse tube
Capacitor
Relay
Relay base
Cover relay bracket
Fan mounting plate
Wiring loom - module
Wiring assy - electronic thermostat
Wiring assy - fan module
Wire – micro switch
Wire – ECO
Pre 09/02/05
After 09/02/05
079612
108255
053011
108235
053014
053015
053047
053012
053013
108236
108260
052926
052925
052931
052929
052930
079615
108255
053011
108235
053014
053015
053047
Not Fitted
Not Fitted
108236
108260
052934
052923
Not fitted
052929
052930
* NI – Not illustrated
TM011 H.S.I Heavy Duty Gas Service Instructions
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Burner Assembly Exploded View – 275L
2
4
3
5
1
9
6
7
10
8
Replacement Burner Parts List – 275L
Item
1
2
3
4
5
6
7
8
9
10
Description
Burner Assembly
Igniter Holder
H.S.I Igniter and flame probe
Gas valve bracket
Regulator spring – Propane / Butane
Regulator spring – Natural / TLP
Test point spigot
Gas valve – White Rogers
Burner feed pipe
Cord Clamp
Natural Gas
Propane Gas
Main burner injector
TLP Gas
Butane Gas
TM011 H.S.I Heavy Duty Gas Service Instructions
D.O.I: 03/06
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Part Numbers
074454
145405
071420
108001
079520
079530
079506
079500
073105
053003
073907
073903
073901
073904
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Gas Type Conversion Procedure
For warehouse gas type conversions the burner operation and gas
tightness testing must be completed by dry firing the water heater or
fully assembled burner/gas control assembly. Do NOT leave the main
burner on for more than 30 seconds if dry firing. Where gas is
unavailable for testing, gas type conversions must NOT be conducted.
1. Isolate the gas and power supplies to the water heater.
2. Remove the access door and burner access panel (outdoor models) or the gas control
cover (indoor models). Note: On 631275 models it will be necessary to disconnect the
wiring to the door switch to remove the burner access panel.
Injector Replacement
3. Remove the 2 screws retaining the injector holding bracket to the burner (275 models)
or to the water heater jacket (265 models)
4. 265 models: Disconnect the burner feed pipe from the gas control, withdraw the entire
burner slightly, remove the spring clip and remove the burner feed pipe
275 models: Disconnect the burner feed pipe from the gas control and remove the
burner feed pipe.
5. Unscrew the main injector and replace with one suitable for the supply gas type and
model (refer to page 80) using suitable gas thread sealant.
6. Refit the burner feed pipe in reverse order of steps 3 and 4 above.
Gas Control
7. Remove the gas pressure regulator cap, gas pressure adjuster and existing regulator
spring. Fit a replacement spring suitable for the gas type (refer to page 80) and refit the
adjuster.
Reassembly and Testing
8. Refit the burner access panel (outdoor models) and reconnect the door switch wiring
(631275 models)
9. Fit manometer to burner test point
10.Restore gas and power supplies, allow heater to light and test all unions with soapy
water solution for gas leaks. NOTE: On 631275 models it will be necessary to hold
the door switch closed.
11.Adjust the burner pressure to that suitable for the supply gas type and model (refer to
page 80) and refit the gas pressure regulator cap.
12.Adjust the burner interrupter screw. On natural, propane and butane gases the
interrupter screw is normally set flush with the burner casting (fully out) for Towns or
TLP gas adjust the interrupter screw to achieve a stable blue flame.
13.Turn power to the water heater off, remove manometer and refit test point screw and
sealing washer securely.
14.Replace gas type label with one suitable for the supply gas type and adjust details of
injector size and burner pressure on rating plate to reflect the supply gas type (refer to
page 80).
15.Refit the access door (outdoor models) or the gas control cover (indoor models) and
restore power to the water heater.
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265 Gas Conversion Replacement Parts List
Conversion components
Component
Size (mm)
Main Burner Injector
Part N°
Gas Control / Regulator Spring
Gas Type Label
Natural Gas
4.80
073502
079530
121802
Component Part Number
Butane Gas
LP Gas
2.50
2.90
073504
073503
079520
079520
121804
121805
Town Gas
8.60
073501
079530
121801
Natural Gas
0.85
3.5
1.13
Butane Gas
2.50
3.5
2.75
Town Gas
0.32
3.5
0.75
Settings
Burner Pressure Setting (kPa)
Max Gas Supply Pressure (kPa)
Min Gas Supply Pressure (kPa)
LP Gas
2.50
3.5
2.75
275 Gas Conversion Replacement Parts List
Conversion components
Component
Size (mm)
Main Burner Injector
Part N°
Gas Control Regulator Spring
Gas Type Label
Natural Gas
6.50
073907
079530
121802
Component Part Number
Butane Gas
LP Gas
3.20
3.80
073904
073903
079520
079520
121804
121805
Town Gas
10.50
073901
079530
121801
Natural Gas
0.90
3.5
1.13
Butane Gas
2.65
3.5
2.75
Town Gas
0.50
3.5
0.75
Settings
Burner Pressure Setting (kPa)
Max Gas Supply Pressure (kPa)
Min Gas Supply Pressure (kPa)
TM011 H.S.I Heavy Duty Gas Service Instructions
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LP Gas
2.65
3.5
2.75
80
Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Rheem Water Heater (Excluding Solar) Warranty
- Australia Only WARRANTY CONDITIONS
1. This warranty is applicable only to water
heaters
manufactured
from
1st January 2002.
2. The water heater must be installed in
accordance with the Rheem water heater
installation instructions, supplied with the
water heater, and in accordance with all
relevant statutory and local requirements of
the State in which the water heater is
installed.
3. Where a failed component or water heater
is replaced under warranty, the balance of
the original warranty period will remain
effective. The replaced part or water heater
does not carry a new warranty.
4. Where the water heater is installed outside
the boundaries of a metropolitan area as
defined by Rheem or further than 25 km
from a regional Rheem branch office,
or an Accredited Service Agent, the cost of
transport, insurance and travelling costs
between the nearest Rheem Accredited
Service Agent’s premises and the installed
site shall be the owner’s responsibility.
5. The warranty only applies to the water
heater and original or genuine (company)
component replacement parts and therefore
does not cover any plumbing or electrical
parts supplied by the installer and not an
integral part of the water heater,
e.g. pressure limiting valve; isolation valves;
non-return valves; electrical switches;
pumps or fuse.
6. The water heater must be sized to supply
the hot water demand in accordance with
the guidelines in the Rheem water heater
literature.
WARRANTY EXCLUSIONS
1. REPAIR AND REPLACEMENT WORK WILL BE CARRIED OUT AS SET OUT IN THE
RHEEM WATER HEATER WARRANTY, HOWEVER THE FOLLOWING EXCLUSIONS MAY
CAUSE THE WATER HEATER WARRANTY TO BECOME VOID AND MAY INCUR A
SERVICE CHARGE AND / OR COST OF PARTS.
(a) Accidental damage to the water heater or
(c) Where the water heater or water heater
any component, including: Acts of God;
failure due to misuse; incorrect installation;
attempts to repair the water heater other
than by a Rheem Accredited Service Agent
or the Rheem Service Department.
(b) Where it is found there is nothing wrong
with the water heater; where the complaint
is related to excessive discharge from the
temperature and / or pressure relief valve
due to high water pressure; where there is
no flow of hot water due to faulty plumbing;
where water leaks are related to plumbing
and not the water heater or water heater
components; where there is a failure of gas,
electricity or water supplies; where the
supply of gas, electricity or water does not
comply with relevant codes or acts.
component has failed directly or indirectly
as a result of: excessive water pressure;
excessive temperature and / or thermal
input; corrosive atmosphere.
(d) Where the water heater is located in a
position that does not comply with the
Rheem water heater installation instructions
or relevant statutory requirements, causing
the need for major dismantling or removal of
cupboards, doors or walls, or use of special
equipment to bring the water heater to floor
or ground level or to a serviceable position.
(e) Repairs to the water heater due to scale
formation in the waterways when the water
heater has been connected to a harmful
water supply as outlined in the Owner’s
Guide and Installation Instructions booklet.
2. SUBJECT TO ANY STATUTORY PROVISIONS TO THE CONTRARY, THIS WARRANTY
EXCLUDES ANY AND ALL CLAIMS FOR DAMAGE TO FURNITURE, CARPETS, WALLS,
FOUNDATIONS OR ANY OTHER CONSEQUENTIAL LOSS EITHER DIRECTLY OR
INDIRECTLY DUE TO LEAKAGE FROM THE WATER HEATER, OR DUE TO LEAKAGE
FROM FITTINGS AND / OR PIPE WORK OF METAL, PLASTIC OR OTHER MATERIALS
CAUSED BY WATER TEMPERATURE, WORKMANSHIP OR OTHER MODES OF FAILURE.
TM011 H.S.I Heavy Duty Gas Service Instructions
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Document Revision History
Title: - Service Instructions For Rheem Heavy Duty Gas
Document
Number:
Revision
Details of change
A
Service Instructions issued for H.S.I Heavy Duty Gas models
TM011 H.S.I Heavy Duty Gas Service Instructions
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TM011
D.O.I.
03/06
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Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”