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Rheem Australia Pty Ltd
SERVICE INSTRUCTIONS
Lazer 441, 451, 741, 751, 761,
This document is stored and maintained electronically by
771, 781 & 791 Series
Lazer 1 & 2
441 Series
451 Series
741 Series
751 Series
First Issued: May 1987
Silhouette
(Designer Series)
(Modular Series)
761 Series
771 Series
781 Series
Service. All printed copies are deemed "uncontrolled"
ABN 21 098 823 511
TM001
Revision: AD
Issued: Jan 14
Classic
Silhouette
(Modular Series)
791 Series
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Table of Contents
Related Manuals for Rheem 441 Series
Summary of Contents for Rheem 441 Series
- Page 1 Rheem Australia Pty Ltd ABN 21 098 823 511 SERVICE INSTRUCTIONS Lazer 441, 451, 741, 751, 761, 771, 781 & 791 Series TM001 Revision: AD Issued: Jan 14 Silhouette Classic Silhouette Lazer 1 & 2 (Designer Series) (Modular Series) (Modular Series)
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Page 2: Table Of Contents
CONTENTS INTRODUCTION ........................3 SAFETY WARNING......................... 3 MODEL IDENTIFICATION ....................... 3 SPECIFICATIONS ........................4 PREVENTATIVE MAINTENANCE ..................5 OPERATION ..........................6 Electronic Controller Operating Modes ................. 6 COMPONENTS AND THEIR FUNCTIONS ................7 INSTALLATION NOTES ......................8 WIRING DIAGRAMS ....................... 9 741/751 (2.5L - 40L) ...................... -
Page 3: Introduction
INTRODUCTION The information provided in these instructions is based on the Rheem Lazer Boiling Water Unit being installed in accordance with the installation instructions provided with each unit. Should you require further technical advice on the Rheem Lazer Boiling Water Unit, contact your nearest Rheem Australia Service Office where all genuine replacement parts are also available. -
Page 4: Specifications
SPECIFICATIONS Inlet Water Pressure (kPa) 741025 771025 10 amp 230/240 VAC 1 x 2.4 1000 R½/15 761025 3-pin plug 50Hz 791025 10 amp 230/240 VAC 741045 1 x 2.4 1000 R½/15 3-pin plug 50Hz 771050 10 amp 230/240 VAC 761050 1 x 2.4 1000 R½/15... -
Page 5: Preventative Maintenance
PREVENTATIVE MAINTENANCE It is suggested for peak performance that the Boiling Water Unit be serviced every six months. Servicing must be performed by suitably qualified persons. Hot surface or liquid. Personal Protective Clothing (PPE) shall be worn to reduce the risk of burns or scalding. 1. -
Page 6: Operation
OPERATION IMPORTANT: High altitude will affect the Lazer Boiling Water Unit operation. Refer to page 17 for more details To commission water heater from empty: Turn on water supply first Turn on 240V supply, solenoid will open and filling will commence. Filling will continue until the water reaches the WLS low-level probe. -
Page 7: Components And Their Functions
Mode 3. Full When water has covered the WLS high-level probe the solenoid will close and heating will continue until a temperature of 97ºC is attained. The solenoid will open again for a split second at this time. Thereafter the solenoid opens only when the water level falls below the WLS high- level probe. -
Page 8: Installation Notes
TEMPERATURE SENSOR (WTS): A thermistor is inserted inside the probe of the heating unit and monitors water temperature to maintain water at near boiling point. OVERFLOW / VENT: The outlet of this pipe must be to atmosphere for the following reasons: To allow air to escape while filling To allow excess water to escape... -
Page 9: Wiring Diagrams
ELECTRICAL CONNECTION: All Lazer Boiling Water Units are designed for 220/240 volt 50 Hertz electrical supply. Installations that cannot achieve the specified supply current, i.e. private generators should be avoided. The internal wiring is designed to suit the load rating of the heating unit stated on the RATING LABEL found inside the jacket. -
Page 10: 761, 791 & 771/781 (2.5L - 40L)
761, 791 & 771/781 (2.5L – 40L) 761- 791 - 771/781 Series 2.5L - 15L Solenoid W BL 2.4kW Element Note: ECO not fitted on 15L models Terminal Block 761 & 791 Board models only B=Black BL=Blue BR=Brown G=Green W=White R=Red B/W=Black/White 771/781 Series... -
Page 11: Fault Finding
FAULT FINDING It is possible to independently test individual components of the Lazer Boiling Water Unit, however it is strongly recommended that this Test Procedure be followed irrespective of a suspected malfunctioning component. A failed or malfunctioning component may be the result of incorrect installation, faulty or intermittent services, i.e. -
Page 12: Mode 1 Fault Finding
Mode 1 Fault Finding Is the solenoid open? Does the solenoid close? Mode 2 Diagnosis Is there continuity of the earth strap from the tank Repair broken strap or wiring to the ECB? TEST 1 Disconnect the plug from the water level probe Is the connection to the Clean connection or replace... -
Page 13: Component Tests 1 - 4
Component Tests 1 - 4 Test 1 Test 2 Normal resistance between the tank and the earth Normal resistance between the high level point on the ECB is 0 ohms (dead short) when probe wire and low level probe wire should measured with a multimeter on the x1 resistance be infinity (open circuit) when measured with scale. -
Page 14: Mode 2 Fault Finding
Mode 2 Fault Finding Is voltage present Replace ECB at the element? Capacity of Lazer? 2.5, 5 & 7.5 litre models Retest operation TEST 5 Is voltage 15, 25 & 40 litre models present at relay? TEST 6 Replace relay Retest operation Has the Replace solenoid... -
Page 15: Component Tests 5 - 8
Component Tests 5 - 8 Test 5 Test 6 Install RCD and exercise caution when Install RCD and exercise caution when conducting live tests conducting live tests Normal voltage at the element is 240v when Normal voltage to the relay coil is 240v when measured with a multimeter on the AC voltage measured with a multimeter on the AC voltage scale... -
Page 16: Mode 3 & 4 Fault Finding
Mode 3 & 4 Fault Finding Siphoning may be occurring. Advise user to have a tundish installed as per the installation Are large quantities of hot instructions. Is the vent pipe water being discharged Unit may enter over longer than 3 metres? from the vent pipe? temperature (OTC) mode during this condition if the... -
Page 17: Lazer Boiling Water Units At High Altitudes
LAZER BOILING WATER UNITS AT HIGH ALTITUDES An increase in altitude will reduce the boiling temperature of water. Therefore it is necessary to provide an adjustment on the Lazer Control System for installations over 300 metres above sea level. All controllers supplied as a component of the finished product are factory adjusted to deliver water at a temperature of 92ºC. -
Page 18: Electrical In-Service Testing
ELECTRICAL IN-SERVICE TESTING Wear Personal Protective Equipment when conducting step 1 of these procedures to reduce the risk of electric shock. Refer to Rheem safety procedure on electrical testing. 1. For 3 – 15L models: Isolate power by switching off at power point and unplugging BWU 3 pin plug from power point. -
Page 19: Accessing Components
ACCESSING COMPONENTS Ensure that the unit is unplugged or isolated from the electrical supply. Removing & Replacing Jacket Lid and Name Plate (741/751 Series) Removing the Lid (Figure 1) 1. Remove the four retaining screws. 2. Remove the LID by lifting from the jacket. Figure 1 Removing the Nameplate (Figure 2) 1. -
Page 20: Component Replacement
COMPONENT REPLACEMENT Water Temperature Sensor (Thermistor) Ensure that the unit is unplugged or isolated from the electrical supply. 741/751 Series 1. Remove the nameplate. (Refer to page 19) 2. Disconnect the wiring to the water temperature sensor. 3. Withdraw the water temperature sensor from the element. - Page 21 Electronic Control Box Ensure that the unit is unplugged or isolated from the electrical supply. 741/751 Series 1. Remove the Jacket Top (Refer to page 2. Gently disconnect the push-on spade terminals 3. Slide the ECB upwards to disengage from the metal tabs in the back panel and lift the ECB clear.
- Page 22 Solenoid Valve Ensure that the unit is unplugged or isolated from the electrical supply and the stopcock is closed. 761, 771/781 and 791 Series 1. Remove the Jacket Front (2.5L - 7.5L models, refer to page 19) or Side Panel (15 - 40L models, refer to figure 9) 2.
- Page 23 Water Level Probe Ensure that the unit is unplugged or isolated from the electrical supply and the stopcock is closed. A common Water Level Probe is supplied as a replacement part. Prior to fitting the probe it may be necessary to cut the long and short sensor wires to suit the model. Refer to the table on page 24 for correct cutting lengths.
- Page 24 Water Level Probe Lengths Cut each leg of the Water Level Probe to the length shown in the table below Short Probe Length in mm Long Probe Length in mm Model (Length X) (Length Y) 741025 137.5 741045 262.5 741075 / 751075 741150 / 751150 367.5 741250 / 751250...
- Page 25 Element Ensure that the unit is unplugged or isolated from the electrical supply and the stopcock is closed. Water at elevated temperatures may be present when draining, care should be taken to prevent scalding. 741/751 Series 1. Drain the Lazer boiling water unit 2.
- Page 26 Ensure that the unit is unplugged or isolated from the electrical supply and the stopcock is closed. Water at elevated temperatures may be present when draining, care should be taken to prevent scalding. 741/751 & 771/781 Series 1. Drain the Lazer boiling water unit. Tap head only 2.
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Page 27: Document Revision History
Service Instructions updated to cover 741, 751, 771, 781, 761 & 791 27/04/01 series Lazer Reference to Southcorp replaced by Rheem Australia 28/03/03 Format updated; Warranty Statement removed; Exploded views & Replacement Parts Lists removed, now form part of Boiling Water...