Related Manuals for A.O. Smith Innovo IR 12-160
Summary of Contents for A.O. Smith Innovo IR 12-160
- Page 1 Innovo Condensing High Efficiency Water Heater IR 12-160/12-200/20-160/20-200/24-245/ 24-285/32-245/32-285/32-380 Installation, User and Service Manual...
- Page 2 Data is subject to change. A.O. Smith Water Heaters A.O. Smith Europe Unit B7-B8 Armstong Mall De Run 5305 T : 0870 267 6484 Southwood Business Park PO Box 70 sales@aosmith.co.uk Farnborough Hampshire 5500 AB Veldhoven www.aosmith.co.uk GU14 ONR UK...
-
Page 3: Preface
Refer to the appendix Warranty (see 13.6) for the warranty provisions. Liability User A.O. Smith accepts no liability when the water heater is not used correctly and requires the user to: • Read this manual carefully and obey the instructions. -
Page 4: Compliance
CE-marking and all necessary documentation to obey these regulations. See the compliance section. (on page 4) A.O. Smith accepts no liability for claims from third parties when: • The instructions for the correct installation of the water heater are not obeyed. -
Page 5: Contact Information
Contact information If you have any comments or questions, please contact: A.O. Smith Water Products Company Adress: PO Box 70 5500 AB Veldhoven The Netherlands Telephone: 0870 - AOSMITH (free) 0870 - 267 64 84 General: +31 40 294 25 00 E-mail: info@aosmith.nl... -
Page 7: About This Manual
About this manual Scope This manual gives information about safe and correct use of the water heater and how installation, maintenance and service activities have to be done correctly. You must obey the instructions in this manual. Caution Read this manual carefully before you start the water heater. It can cause personal injury and damage to the water heater when you do not read the manual and/or do not obey the instructions. -
Page 8: Document Identification
This manual contains the following text styles/symbols for situations that may endanger users/engineers, cause damage to equipment or need special attention: Note A note gives more information on a topic. Caution Obey the caution instructions to prevent damage of the water heater. Warning Obey the warning instructions to prevent danger of personal injury, and serious damage to the water heater. -
Page 9: Table Of Contents
Table of Contents Preface..................3 Copyright................3 Trademarks............... 3 Warranty................3 Liability................3 Compliance............... 4 Regulations............... 4 Contact information............5 About this manual............... 7 Scope................7 Target group..............7 Notation conventions............7 Document identification............8 User part..............13 Introduction................15 Safety..................17 Interface................... 19 Operator interface............19 3.1.1 Control Switch..............19 3.1.2... - Page 10 Turn on the water heater........... 25 4.2.1 Switch to ON mode............25 4.2.2 Set the water temperature..........25 Turn off the water heater........... 25 4.3.1 Turn off for a short period..........25 4.3.2 Isolate from the mains............26 4.3.3 Turn off for a long period........... 26 Installation, Maintenance and Service part....
- Page 11 8.7.1 C13/C33 concentric systems..........43 8.7.2 C13/C33 parallel systems..........45 8.7.3 C43/C53/C63 systems............47 Electrical connections............48 8.8.1 Preparation..............48 8.8.2 Mains power..............50 8.8.3 Optional electrical connections..........50 8.8.4 Finalization..............51 Commissioning..............52 8.9.1 Filling................52 8.9.2 Air pressure differential............. 52 8.9.3 Gas supply pressure............53 8.9.4 value................54 8.9.5...
- Page 12 Troubleshooting................ 71 12.1 Errors and warnings............71 12.1.1 General errors..............71 12.1.2 Displayed errors............... 74 12.1.3 Warnings................. 80 Appendices................81 13.1 Technical details............... 81 13.2 Dimensions..............82 13.3 Gas details..............84 13.3.1 Energy labeling..............85 13.4 Electrical wiring diagram............87 13.5 Declaration of conformity...........89 13.6 Warranty.................
-
Page 13: User Part
User part 0312266_INNOVO_UKUK_V5.1, 2022-07-12... -
Page 15: Introduction
Introduction The Innovo water heater stores and heats water for sanitary purposes. Cold water enters the bottom of the tank through the water inlet (1). The heated water leaves the tank at the top through the hot water outlet (2). To operate the water heater, the display (3) and control switch (4) are used. - Page 16 User part...
-
Page 17: Safety
Safety A.O. Smith cannot be held responsible for damages or injuries which can be lead back to: • Failure to follow the instructions provided in this manual. • Carelessness during use or maintenance of the water heater. Every user must study the user part of this manual and must follow the instructions in this part of the manual strictly. - Page 18 User part...
-
Page 19: Interface
Interface Operator interface The operator interface consists of: • a control switch (see 3.1.1) on the left side of the water heater • 5 push buttons (see 3.1.2) to navigate through the menu • a LCD-display (see 3.1.3) that shows settings, functions, values and errors. The operator interface is parameter driven and enables the user to change parameters and to verify the status and history of the water heater. -
Page 20: Buttons
3.1.2 Buttons The 5 buttons on the operator panel give access to the menu of the water heater. Button Function Scroll up / Raise Scroll down / Lower [ENTER] Enter / Confirm [RESET] Reset / Cancel [MENU] Go to menu 3.1.3 LCD display The LCD display shows 7 different symbols around the outer edge of the display and 3... -
Page 21: Status Of The Water Heater
The user menu parameters are: Parameter Description Unit/Value Adjustable Range Default Turn the water heater on or off. OFF - water heater off (OFF mode) ON - water heater on (ON mode) Setpoint ON mode ºC 40…max setpoint Hysteresis ºC 2…15 Turn setpoint EXT mode (005) ENA - Enable... -
Page 22: Error Conditions
Fig. Actual water Fig. Setpoint Fig. Standby temperature 3.2.1.3 External ON mode In the external ON mode, the water heater will respond to a heat demand when the relay switch is closed. Use parameter 004 to switch on the setpoint (parameter 005) of the external ON mode. -
Page 23: Anode Warning
3.2.4 Anode warning An anode protects the tank against corrosion. When the anode protection is not active, the display shows Ano. Contact your service and maintenance engineer. Fig. Anode warning display Note If you ignore the anode warning, the tank protection cannot be guaranteed. The warranty will be void. - Page 24 User part...
-
Page 25: Use
Set a parameter value To set a parameter value: Press [MENU] to access the user menu. Press [ ] or [ ] to scroll to the concerning parameter, refer to Parameters (see 3.1.3). Press [ENTER] to select. Use [ ] or [ ] to change the parameter value. Press [ENTER] to confirm. -
Page 26: Isolate From The Mains
Note If the water heater is in OFF mode for more than 2 months and no water is drained, air bubbles may be formed in the water heater. This can lead to air in the water pipes. 4.3.2 Isolate from the mains To isolate the water heater from the mains: Set parameter 001 to OFF, refer to Set a parameter value (see 4.1). -
Page 27: Installation, Maintenance And Service Part
Installation, Maintenance and Service part 0312266_INNOVO_UKUK_V5.1, 2022-07-12... - Page 28 User part...
-
Page 29: Introduction
Introduction About the water heater The Innovo water heater is intended for heating water for sanitary purposes. The Innovo is a condensing gas–fired storage water heater with a fan in the air intake. The flue gasses transfer their heat to the water through an efficient heat exchanger. The water heater has a concentric venting connector and can function as an open or as a room- sealed water heater. - Page 30 The gas control valve opens and the gas/air mixture is ignited. The water heater heats the water in the tank. The icon "Water heater in operation" is shown on the display of the water heater. When the water temperature reaches the setpoint, the heat demand ends and the controller stops the operating cycle.
-
Page 31: Safety
Safety Safety instructions For safety instructions on the use of the water heater, refer to Safety (see 2) in the User part of this manual. Warning Installation, maintenance and service must be carried out by a qualified engineer in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire brigade. -
Page 32: Instructions On The Water Heater
Caution To prevent that you damage the components of the water heater, make sure that it is completely stopped operation before you turn off the water heater (see 4.3). Wait 1 minute after you switch the water heater to OFF mode, before you switch the control switch to 0. -
Page 33: Safety Devices
Safety devices Fig. Safety devices 1. Temperature sensor 2. Gas control valve 3. Air proving switch 4. Flame probe " Safety devices of the water heater: Temperature The water heater controls the water temperature sensor (1) using a temperature sensor: T <... -
Page 34: Environmental Aspects
Environmental aspects 6.4.1 Recycling The packaging material is environmentally friendly, recyclable and relatively easy to discard. 6.4.2 Disposal Old end-of-life appliances contain materials that need to be recycled. When you discard devices at the end of their service life, you must obey local legislation related to waste disposal. -
Page 35: Water Heater
Water heater Structure of the water heater The water heater has the following main components: Controller (8) The controller monitors and manages all internal processes of the water heater for a safe operation. Operator interface (1) To control the water heater and to verify the status, the operator interface has 5 buttons and a 3-character display. - Page 36 Installation, Maintenance and Service part...
-
Page 37: Installation
For more safety instructions, refer to Safety instructions (see 6.1). Packaging A.O. Smith recommends to unpack the water heater at or near its intended location. Remove the packaging material carefully to prevent damage to the water heater. Conditions The water heater is suitable for room-sealed and for open combustion. -
Page 38: Water Composition
8.2.3 Water composition The water must comply with the regulations for drinking water for human consumption. Water composition Water hardness > 1.00 mmol/l: German hardness > 5.6° dH French hardness > 10.0° fH English hardness > 7.0° e CaCO > 100 ppm Conductivity >... -
Page 39: Installation Diagram
Note Make sure that the working clearance at the top of the water heater does not become smaller than 100 cm. Fig. Adjustable leg water heater Installation diagram Note This manual only discusses unvented installations. Fig. Installation diagram 1. Pressure relief valve (mandatory if the mains water pressure is too high) -
Page 40: Water Connections
Note Use this installation diagram when you: install the water connections (see 8.4) install the condensate drain (see 8.5) install the gas connection (see 8.6) fill the water heater (see 8.9.1) drain the water heater (see 8.10.2) Water connections 8.4.1 Cold water connection Install the cold water connection: Install an approved stop valve (4), as required by the applicable regulations (on page... -
Page 41: Condensate Drain
Condensate drain Caution When the condensate drain is not connected to the waste water discharge by an open connection, this can cause faults. Caution Do not change the condensate drain or cause any blockage in the condensate drain. Install the condensate drain: Install a drain pipe to the condense drain (13) for condensate drainage. - Page 42 This manual does not discus installation type B23. When you need a B23 system, contact A.O. Smith for more information. Caution Always make sure that the venting system is mounted into an area suitable for the correct type of installation.
-
Page 43: C13/C33 Concentric Systems
Caution The use of a different wall or roof terminal can result in incorrect functioning of the water heater. Use the part number from the table to order a terminal set from your supplier or the manufacturer. Fig. Venting systems 8.7.1 C13/C33 concentric systems Use a wall terminal set or a roof terminal set to install a C13 or a C33 concentric venting... - Page 44 +0,3 -0,6 -0,7 Diameter air inlet +0,5 +0,5 (Dn 125) (Dn 125) Description parts A.O. Smith Part A.O. Smith Part number number Wall terminal set 0310759 0302515 A wall terminal (1), a 500 mm concentric pipe and a 90° bend...
-
Page 45: C13/C33 Parallel Systems
Diameter flue gas outlet +0,6 +0,3 -0,6 -0,7 Diameter air inlet Description parts A.O. Smith Part A.O. Smith Part number number Wall terminal set 0310730 A wall terminal (1), an adapter, a 500 mm parallel pipe and a 90° bend... - Page 46 Description parts A.O. Smith Part A.O. Smith Part number number Parallel bend 45° 0310701 0307182 Parallel bend 90° 0310702 0307183 1 - supplied with wall flange and clamping ring 2 - supplied with clamping ring 3 - use this part to connect the air inlet and flue gas outlet to the water heater Fig.
-
Page 47: C43/C53/C63 Systems
The flue gas terminal must comply to the EN 1856-1 requirements. The maximum allowable recirculation rate is 10% under wind conditions. Contact A.O. Smith for more information and/or part numbers of the C43, C53 and C63 venting systems. Concentric systems Refer to the table for the correct pipe dimensions of the C43, C53 and C63 concentric systems. -
Page 48: Electrical Connections
-0,7 Diameter air inlet Refer to C13/C33 parallel systems (see 8.7.2) for the A.O. Smith part numbers. The same parts can be used for the C43, C53 and C63 parallel systems. Use the "adapter box concentric to parallel - water heater side" (part number 0312209) for C63 parallel systems. - Page 49 Hold the cover at the sides. Move the cover to the front and lift it from the water heater. Fig. Remove the cover The mains power and optional electrical connections have to be connected to the terminal block of the controller, refer to Structure of the water heater (see 7.1). Fig.
-
Page 50: Mains Power
Connect an additional error signal to the water heater. 8.8.3.1 Isolating transformer For more information about an isolating transformer, or to order an isolating transformer, please contact A.O. Smith. 8.8.3.2 External ON mode switch Install an external ON mode switch: Pull the cables through the tulles. -
Page 51: Finalization
8.8.3.3 Additional error signal Note The water heater has a relay contact that can be used when an error occurs. The relay contact is potential–free (maximal 5 A). Note There is a 1 minute delay between the switching of the relay contact and the error message on the display. -
Page 52: Commissioning
Commissioning To commission the water heater: Fill the water heater (see 8.9.1) Check the air pressure differential (see 8.9.2) Check the gas supply pressure (see 8.9.3) Check the CO value (see 8.9.4) Turn on the water heater (see 8.9.5) 8.9.1 Filling Refer to the installation diagram (see 8.3) when you fill the water heater: Open the stop valve (11) in the hot water supply pipe. -
Page 53: Gas Supply Pressure
Disconnect the pressure gauge. Reconnect the hoses of the air proving switch and the gas valve. Fig. Air pressure differential 8.9.3 Gas supply pressure Check the gas supply pressure: Loosen the sealing screw (4) of the test nipple by a few turns. Note Do not completely loosen the sealing screw, it can be difficult to retighten it. -
Page 54: Co 2 Value
Disconnect the pressure gauge. Tighten the sealing screw in the test nipple. Fig. Gas supply pressure 1. Adjuster screw 2. Gas control valve 3. Gas supply pipe 4. Sealing screw " 8.9.4 value Check the CO value: Open the gas supply. Remove the cap (1) from the test nipple (2) of the flue gas outlet pipe. -
Page 55: Turn On The Water Heater
If applicable, set the temperature value back to the original value (parameter 002). Set parameter 201 to dIS, refer to Settings (see 10). Press [RESET]. The water heater goes into OFF mode. Set the control switch on the side of the water heater to 0 to turn off the water heater. - Page 56 Installation, Maintenance and Service part...
-
Page 57: Conversion Of Gas Type
Conversion of gas type Caution Conversion of the water heater may only be carried out by a qualified person. Use a special conversion kit to converse the water heater when: • The water heater has to operate on a different family of gases (liquid petroleum gas or natural gas). - Page 58 Installation, Maintenance and Service part...
-
Page 59: Settings
Settings 10.1 Operator interface The operator interface is parameter driven and enables the user to change parameters and to verify the status and history of the water heater. When you press [MENU] once, parameters 001 to 120 can be accessed. All other parameters can be accessed when you press [MENU] for 10 seconds. - Page 60 Parameter Description Unit/Value Adjustable Range Default Status burner Initialization 0 - Initialization Reset 1 - Reset Stand-by 2 - Stand-by Pre-purge (1) 3 - Pre-purge (part 1) Pre-Purge (2) 4 - Pre-Purge Pre-Ignition (part 2) Ignition 5 - Pre Ignition Flame check 6 - Ignition Burn...
-
Page 61: Hysteresis
Parameter Description Unit/Value Adjustable Range Default Last lock-out error C02…S14 --- - no error Interval between last lock-out Minutes 00n...59n = 0 till 59 minutes and read-out. Hours 01h...23h = 1 till 23 hours Days 01d...06d = 1 till 6 days Weeks 01...63 = 1 till 63 weeks Last blocking error... -
Page 62: Error History
10.4 Error history The control unit automatically stores data of occurred errors and failed actions of the water heater. The error history can be used to analyse the water heater and to find the causes of the errors and failed actions. Use parameters 270 till 273 to read the errors. -
Page 63: Maintenance
On the operator interface, the maintenance interval can be set as a reminder. The display shows Src when the pre-set interval has elapsed. To determine the correct interval, A.O. Smith recommends to do a system check on both the water and the gas side, three months after installation. -
Page 64: Preparation
Make sure the gas supply pressure is correct, refer to Gas supply pressure (see 8.9.3). Make sure the CO value is correct, refer to CO value (see 8.9.4). 11.2 Preparation Isolate the water heater from the mains (see 4.3.2) before you start maintenance tasks. 11.3 Water-side maintenance To do water side maintenance:... -
Page 65: Clean The Condensate Drain
11.3.2 Clean the condensate drain To clean the condensate drain: Place a tray or towels under the condensate drain to collect water leakage. Remove the condense trap at the bottom of the condensate drain. Empty the condense trap and clean it with water. Make sure that there is no grit or other blockages in the condense trap. - Page 66 Loosen the two bolts (3) to disconnect the burner engine (4) from the adapter. Take the burner engine out of the water heater. Fig. Remove the burner engine 1. Plugs on burner engine 2. Gas supply pipe 3. Bolts 4. Burner engine Remove the burner: Loosen the four nuts (5) to disconnect the burner assembly (6) from the combustion chamber (7).
-
Page 67: Clean The Combustion Chamber
Disassemble the burner: Remove the flame rod (11) from the adapter (12). Do a visual check on the flame rod. Remove the hot surface igniter (10) from the adapter. Do a visual check on the hot surface igniter. Make sure that there is no tear on the non-return valve (8) and that this valve is not deformed. -
Page 68: Assemble The Burner
11.4.3 Assemble the burner Assemble the burner again when the burner and the combustion chamber both are cleaned. Note Before reassembly replace the gasket, bolts and washers. You can order a special gasket and mounting set at your supplier. Look at the data plate for the correct ordering information. - Page 69 Turn on the water heater (see 4.2). Set parameter 211 to rst, refer to Settings (see 10). Press [RESET]. The water heater goes to OFF mode. 0312266_INNOVO_UKUK_V5.1, 2022-07-12...
- Page 70 Installation, Maintenance and Service part...
-
Page 71: Troubleshooting
Troubleshooting 12.1 Errors and warnings The water heater can have three different kinds of errors and warnings: • General errors (see 12.1.1), which are not displayed • Displayed errors (see 12.1.2), which are divided in two different groups: Lock out errors: when the cause is removed, you can reset the error to resume operation. - Page 72 Indication Cause Measure Water leakage There is a leakage from a threaded Tighten the threaded connection. water connection. There is a condensate leakage Make sure that the condensation water discharge is working properly. If necessary, correct the water discharge. There is a leakage from another nearby Trace the leakage.
- Page 73 Indication Cause Measure value (at full load) The unit is not set for the correct gas Make sure that the gas type type corresponds with the information on is not correct the rating plate Make sure if the venturi restrictor has the correct diameter, refer to Gas details.
-
Page 74: Displayed Errors
12.1.2 Displayed errors Note For the coding of the connections, refer to the Electrical wiring diagram (see 13.4). Note Contact your service and maintenance engineer if the error persists. Code and description Cause Measure C02 (lock out error) Incorrect reference voltage from Make sure that the wiring/flame probe Control error the AD converter. - Page 75 Code and description Cause Measure E05 (lock out error) Control was in a blocking error for at Press [RESET] to reset the water Control error least 20 hours. heater. If the error reappears: Find the cause of the blocking error (parameter 272).
- Page 76 Code and description Cause Measure F03 (lock out error) Hoses are damaged. Make sure that the hoses, between Air proving switch error the air proving switch and fan and the air proving switch and gas control Switch is not closed when valve are not damaged and reset the fan is running during pre- controller.
- Page 77 Code and description Cause Measure F04 (lock out error) No gas. Make sure that the main gas supply Ignition error valve is open. If necessary, open the valve. Three unsuccessful ignition attempts. Make sure that the manual gas supply valve, before the gas control valve, is open.
- Page 78 Code and description Cause Measure F05 (lock out error) Recirculating flue gases due too Make sure the flue terminal is installed Flame error incorrect roof or wall flue terminal. correctly, refer to Venting system (see 8.7). If necessary, connect the correct Too many flame failures flue terminal.
- Page 79 Code and description Cause Measure F11 (blocking error) Defective gas control valve. Make sure that there is no flame after Ionisation error the gas control valve has closed. Ionisation measured with If there is a flame, the gas control a closed gas control valve valve must be replaced.
-
Page 80: Warnings
12.1.3 Warnings Note For the coding of the connections, refer to the Electrical wiring diagram (see 13.4). Indication Cause Remark Src Service is required The water heater exceeded the pre-set The water heater operates, but displays this service interval. warning. Periodic maintenance is a part of the Warranty (on page 3). -
Page 81: Appendices
Appendices 13.1 Technical details Description Unit IR-12-160 IR-12-200 IR-24-245 IR-24-285 IR-32-380 IR-20-160 IR-20-200 IR-32-245 IR-32-285 General Capacity Empty Weight Maximum floor load Maximum operating pressure kPa (bar) 550 (5.5) 550 (5.5) 550 (5.5) 550 (5.5) 550 (5.5) - installation Maximum operating pressure kPa (bar) 800 (8) 800 (8) -
Page 82: Dimensions
13.2 Dimensions Size Description Unit IR-12-160 IR-12-200 IR-24-245 IR-24-285 IR-32-380 IR-20-160 IR-20-200 IR-32-245 IR-32-285 Dimensions water heater Height 1270 1545 1545 1745 1745 Width Depth Flue gas outlet/Air inlet mm/mm 80/125 80/125 80/125 80/125 80/125 Dimensions connections Cold water supply Rp 3/4 Rp 3/4 Rp 1... - Page 83 0312266_INNOVO_UKUK_V5.1, 2022-07-12...
-
Page 84: Gas Details
13.3 Gas details Description Unit IR-12-160 IR-20-160 IR-24-245 IR-32-245 IR-12-200 IR-20-200 IR-24-285 IR-32-285 IR-32-380 Gas category 2H (G20) Diameter of the venturi 3.95 3.95 3.95 3.95 restrictor Nominal Load (gross) 12.1 20.0 24.4 32.2 Nominal output 11.7 19.1 23.5 30.7 (12-160) (24-245) (32-245) -
Page 85: Energy Labeling
13.3.1 Energy labeling Description Unit IR-12-160 IR-12-200 IR-20-160 IR-20-200 Declared load profile Load profile Energy efficiency class ( Energy label) Energy efficiency Daily electricity consumption 0.175 0.181 0.172 0.182 Daily fuel consumption kWh GCV 20.526 19.924 20.661 20.853 Mixed water 40°C (V40) 1111 Additional load profile Load profile... - Page 86 Description Unit IR-24-245 IR-24-285 IR-32-245 IR-32-285 IR-32-380 Declared load profile Load profile Energy efficiency class ( Energy label) Energy efficiency Daily electricity consumption 0.192 0.207 0.201 0.219 0.204 Daily fuel consumption kWh GCV 26.210 26.414 26.255 26.638 26.748 Mixed water 40°C (V40) 1976 2282 3372...
-
Page 87: Electrical Wiring Diagram
13.4 Electrical wiring diagram 0312266_INNOVO_UKUK_V5.1, 2022-07-12... - Page 88 Cable colors Terminal block connections Control switch Display Brown Earth Fan (power supply) Blue Neutral Fan (control) Green/Yellow Phase input Earth connection mounting plate Black Components Earth connection burner flange White Control Earth connection housing Flame rod Temperature sensor 1 Green Hot surface igniter Temperature sensor 2...
-
Page 89: Declaration Of Conformity
13.5 Declaration of conformity 0312266_INNOVO_UKUK_V5.1, 2022-07-12... -
Page 92: Warranty
Article 2: Tank warranty If, after inspection and at the sole discretion of A.O. Smith, the glass-lined steel tank of a water heater supplied by A.O. Smith proves within 3 years of the original installation date to be leaking due to rust or corrosion occurring on the water side, then A.O. Smith shall offer to replace the defective water heater with an entirely new water heater of equivalent size and quality. - Page 93 (assemblies or parts of) water heaters supplied for replacement, other than the warranty expressly set out in these Articles. Under the terms of the supplied warranty, A.O. Smith is not liable for damage to persons or property caused by (assemblies or parts, or the glass-lined steel tank of) a (replacement) water heater that it has supplied.
- Page 94 Installation, Maintenance and Service part...
-
Page 95: Index
Index Electrical wiring diagram...... 87 Energy labeling........85 Environmental aspects......34 About the water heater......29 Error conditions........22 About this manual......... 7 Error history........62 Additional error signal ......51 Errors and warnings ......71 Air pressure differential ....... 52 External ON mode....... 22 Ambient conditions ...... - Page 96 Trademark........... 3 Trademarks.......... 3 Troubleshooting........71 Mains power........50 Turn off for a long period...... 26 Maintenance........63 Turn off for a short period.....25 Maximum floor load......37 Turn off the water heater....25, 55 Turn on the water heater...... 55 Notation conventions ......