Gebruiksaanwijzing /service van het product 28 30 50 60 van de fabrikant A.O. Smith
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W A TER PRODUCTS COMP ANY A DIVISION OF A. O. SMITH CORPORA TION XTRA HIGH EFFICIENCY X T R A H I G H E F F I C I E N C Y X T R A H I G H E F F I C I E N C Y Installation User and Service Manual 28 30 50 60 Release R.
your installer www.aosmithinternational.com.
Release R.1.3 UK 3 Wa rn i n g Read this manual careful ly before first using the water heater . Failure to read this manual and to follow the instructi ons in this manual may lead to accidents, personal injury , and damage to the appliance. Copyright Copyright 2003 A.
4 Instruction Manual BFC.
Release R.1.3 UK 5 gis T able of content s 1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - 9 1.1 About the appliance - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9 1.2 What to do if you smell gas - - - - - - - - - - - - - - - - - - - - - - - - - 9 1.
6 Instruction Manual BFC gis 3.10 Electrical connection - - - - - - - - - - - - - - - - - - - - - - - - - - - 30 3.10.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - 30 3.10.2 Preparation- - - - - - - - - - - - - - - - - - - - - - - - - - - 30 3.
Release R.1.3 UK 7 gis 8.5 Week programme - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55 8.5.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - 55 8.5.2 Starti ng up and shutting down the week program - - - - - - - - 55 8.5.
8 Instruction Manual BFC gis 13.2 Tank warranty - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 89 13.3 Installat ion and conditions o f use - - - - - - - - - - - - - - - - - - - - - 89 13.4 Exclusions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 89 13.
About the appliance Release R.1.3 UK 9 gis 1 Introduction 1.1 About the appliance This manual describes how to install, servi ce and use the BFC appliance. The BFC appliance is a condensing room-seal ed water heater with a fan in the air intake. A concentric chimney connector is fitted standard to the appliance.
Introduction 10 Instruction Manual BFC 1 gis Furthermore, the installation must comply with the manufacturer’s instructions. n Remark Later amendments and/or additions to all regulations, requirements and guidelines published on or prior to the moment of inst al ling, will apply to the installation.
Overview of th is document Release R.1.3 UK 11 gis 1.7 Overview of this document Ta b l e 1 . 2 provides an overview of the contents of this docu ment. Ta b l e 1 . 2 Contents of document Chapter T arget groups Description 2 Functioning of the appliance gis This chapter d e scribe s how the appliance functions.
Introduction 12 Instruction Manual BFC 1 gis.
Introd uction Release R.1.3 UK 13 gis 2 Functioning of the appliance 2.1 Introductio n T opics co vered in this chap ter: • Functional d escription of the appliance ; • The appliance’s heating cycle ; • Protection for the appliance ; • Safety of the inst allation .
Functioning of the ap pliance 14 Instruction Manual BFC 2 gis In this appliance the col d water enters t he bottom of the tank via the cold water inlet n . The tap water , heated by the combustion chamber h and heat exchanger k , leaves the tank through the hot water outlet b .
Protection for the appliance Release R.1.3 UK 15 gis 2.4.1 Water temperatu re protection With temperature sensor T1 g and temperatu re sensor T2 m , the ThermoControl monitors three temperatures which are important for safety . Ta b l e 2 . 1 explains the functioning of the temperature sensors.
Functioning of the ap pliance 16 Instruction Manual BFC 2 gis T able 2.2 shows the trip point per app liance. n Remark The trip point of the pressure switch is not adjustable. 2.4.5 Ionisation rod T o ensure that no gas will fl ow when there is no combustion, an ionisation rod has been fitted.
Introd uction Release R.1.3 UK 17 is 3 Inst allation Wa rn i n g The installation should be carried out by an approved installer in compliance with the general and lo cal regulations imposed by the gas, water and power supply companies and the fire service.
Installation 18 Instruction Manual BFC 3 is 3.3.1 Humidity and ambient temp erature The boiler room must be frost-free, or be protected against frost. T able 3.1 shows the environmental conditions th at must be adhered to, for correct functioning of the electronics presen t in the appliance to be guaranteed.
Environmental conditions Release R.1.3 UK 19 is If the available clearance is less than 100 cm, fle xible magnesium anodes may be ordered from A.O. Smith, the installer / supplier .
Installation 20 Instruction Manual BFC 3 is 3.4 T ech n i cal specifications The appliance is supp lied without accessories. Check the dimensions and oth e r specifications for the accessories to be used, based on Figure 3.2 and T able 3.6 . Figure 3.
Technical specifications Release R.1.3 UK 21 is Ta b l e 3 . 4 Dimensions Dime nsion Description BFC 28 BFC 30 BFC 50 BFC 60 A T otal height (mm) 1370 1900 1900 1900 D Diameter of the appliance (mm) 7.
Installation 22 Instruction Manual BFC 3 is Electrical power consumption W 175 Supply voltage V AC 230 (-15% +10%) Mains frequency Hz 50 (±1 Hz) Ta b l e 3 .
Installation diagram Release R.1.3 UK 23 is Ta b l e 3 . 6 Gas data 3.5 Inst allation diagram Figure 3.3 shows the water and gas connection diagrams fo r unvented and vented installations.
Installation 24 Instruction Manual BFC 3 is Legend a pressure-reducing valve (mandatory) b expansion vessel (mandatory) c T&P valve (mandato ry) d stop valve (re commended) e non-return valve (man.
Water connections, Unv e nte d Release R.1.3 UK 25 is 3.6 W ater connections, Unvented 3.6.1 Col d water side See a in Figure 3.3 . 1. Fit an approved stop valve i on th e cold water side as required by regulations. Refer also to paragraph ’1.3 Regulations’ .
Installation 26 Instruction Manual BFC 3 is 3.7 Water connec tions, Ve n t e d 3.7.1 Cold water side See a in Figure 3.3 . 1. Fit an a pproved stop valve i on the cold water side between the water cistern n and the appli ance, as required by regulations.
Air supply and flue gas discharg e Release R.1.3 UK 27 is 4. Fit the gas suppl y p ipe to the gas control. Wa rn i n g Check for leaks after fitting. 3.
Installation 28 Instruction Manual BFC 3 is 3.9.1 Concentric wall flue terminal T able 3.8 shows the wall flue terminal prescribed by A.O. Smith (installation type C13).
Air supply and flue gas discharg e Release R.1.3 UK 29 is 3.9.2 Con centric roof flu e terminal A.O. Smith W ater Products Company prescribes the roof flue terminal (installation type C33) as specified in Ta b l e 3 . 9 . IMD-0004 Figure 3 .5 Roof flue terminal Ta b l e 3 .
Installation 30 Instruction Manual BFC 3 is 3.10 Electrical connection Wa rn i ng The installation should be ca rried out by an approved installer in complianc e with the general and local regulations imposed by the gas, water and po wer supply companies and the fire service.
Electrical connectio n Release R.1.3 UK 31 is In preparation you should first remove the two plastic covers and the protective cap of the electr ical section. The plastic covers are attached to the appliance by 4 screws and V elcro fastenings. The covers are also joined to each other with V elcro fastenings.
Installation 32 Instruction Manual BFC 3 is 4. Connect th e power cord to the main switch. Wa rn i n g Leave the appliance disconnected unt il you are ready to start it up. 5. If you do not need to make any more co nnections: - Fit the cap o n the electrical connection block.
Checking the sup ply pressure and burner pres sure Release R.1.3 UK 33 is 3. If you do not nee d to make any more connections: - Fit the cap on the electrical conne ction block.
Installation 34 Instruction Manual BFC 3 is 9. Turn the ThermoControl ON by setti ng the 0/I switch to po sition I . The display will now show INTERNAL CHECK for about 10 seconds, and will then go to the main menu.
Conversion to a d i ffer ent gas category Release R.1.3 UK 35 is 17. Activate the “OFF mode” of the ThermoControl: - If the MENU is not displayed: press B . - Use H and L to position the cursor ( » ) beside OFF - Confirm with E . 18. W ait until the fan has stopped .
Installation 36 Instruction Manual BFC 3 is 8. Remo ve the b urner as comple te assembly . 9. Place and fit the burner with parts from the conversion kit. n Remark The burner for LP gases can be recognised by the letter ‘P’ which is stamped into the metal of the gas/air distribution plate 5 .
Conversion to a d i fferent gas category Release R.1.3 UK 37 is n Remark In the event the supp ly pressure for a gas category is the sa me as the burner pressure (see the gas tables in paragraph 3.4 ) then the gas control must be fitted with a flat sealin g plate with cork gasket.
Installation 38 Instruction Manual BFC 3 is.
Introd uction Release R.1.3 UK 39 gis 4 Filling and draining 4.1 Introductio n T opics co vered in this chap ter: • Filling the appli ance . • Draining the appliance . The components refe rred to in thes e paragraphs are illustrated in F igure 4.1 .
Filling an d draining 40 Instruction Manual BFC 4 gis Legend a pressure-reduci ng valve (mandatory) b expansion vessel (mandatory) c T&P valve (mandatory) d stop valve (recommended) e non-return v.
Draining the appliance Release R.1.3 UK 41 gis 4.3 Drainin g the appliance 4.3.1 Draining unvent ed installations Some service activities requ ire the appli ance to be drained. The procedure is as follows: 1. Activate the MENU with B . 2. Use H and L to place the cursor beside OFF .
Filling an d draining 42 Instruction Manual BFC 4 gis.
Introd uction Release R.1.3 UK 43 gis 5 The control p anel 5.1 Introductio n T opics co vered in this chap ter: • 5.2 Operating ; • 5.3 Explanation of the i c o ns ; • 5.4 ON/OFF switch of ThermoControl ; • 5.5 Navigation buttons ; • 5.6 PC connection.
The control pane l 44 Instruction Manual BFC 5 gis 5.3 Expla nation of the icons T able 5.1 gives an explanatio n of the ico n s. 5.4 ON/OFF sw itch of ThermoControl The ON/OFF switch of the ThermoContro l switches the applianc e ON and OFF .
Introd uction Release R.1.3 UK 45 gis 6 S t atus of the appliance 6.1 Introductio n T opics co vered in this chap ter: • 6.2 Operating modes ; • 6.3 Error conditions ; • 6.4 Service condition . 6.2 Operating modes When running, the appliance has four basic operating modes, namely: OFF In this mode, the frost pr otection is activated.
Status of the app liance 46 Instruction Manual BFC 6 gis 1) The current time falls within a s e t time p eriod of the week program. Figure 6.4 shows the display in this situation: - line one: the text PRO G ; - line two: the time, the day and alternately T 1 and T net .
Service condition Release R.1.3 UK 47 gis 6.4 Service condition Figure 6.7 shows the me ssage SERVICE R EQUIRED . Should this message appear , then the appliance is in need of a service and maintenance inspection. In that case, contact your service and maintenance engineer .
Status of the app liance 48 Instruction Manual BFC 6 gis.
Introd uction Release R.1.3 UK 49 gis 7 S t arting up and shutting down 7.1 Introductio n T opics co vered in this chap ter: • S tarting up . • Shutting down . 7.2 St arting up S tart-up the appliance as follows: 1. Fil l the appliance. See chapter ’4 Filling and draining’ 2.
Starting up and shutting do wn 50 Instruction Manual BFC 7 gis • Shut the appliance down for a longer period . 7.3.1 Shut the appliance down for a brie f period (“OFF mode”) T o shut the appliance down fo r a bri e f period , you must activate the frost protection.
The appliance’s heating cycle Release R.1.3 UK 51 gis 7.4 The appliance’ s heating cycle The appliance’s heating cycle is activa ted as soon as the measured water temperature (T net ) falls below the threshold value (T set ). This threshold value depends on the currently selected appli ance operating mode .
Starting up and shutting do wn 52 Instruction Manual BFC 7 gis 5. After a numbe r of seconds pre-glow , the gas control is opened and ignition takes place. -T h e G icon is activated. - The message IGNITION ap pears. 6. After ignition , the flame is detected and the appliance will be running.
Introd uction Release R.1.3 UK 53 gis 8 Main menu 8.1 Introductio n The MENU is reached by pressing button B of theT hermoControl. The options are: n Remark If you fail to make any selection with the main menu open , then af ter 30 seconds, the appliance will au tomatically return to the mode it was previously in.
Main menu 54 Instruction Manual BFC 8 gis This means: 1. B : Activate the main menu with B . 2. SETTINGS : Using button H and/or L go to SETTIN GS and press E . 3. LANGUAGE : Using button H and/or L go to LANGUAGE. 4. Confirm with E : After pressing E , the sub-menu LANGUAGE is activated.
Week programme Release R.1.3 UK 55 gis 8.5 Week pro gramme 8.5.1 Intro duction Using the week program, you can set the water temperature for the days an d times you wish. If the appliance is running under a week program, then this is indicated on the display by the text PROG on the first line ( see Figure 8.
Main menu 56 Instruction Manual BFC 8 gis The display now shows the menu for the week prog ram, see Figure 8.7 . With the default setting, the pr ogram switches on and off every day at 00:00 and 23:59 hours respectively , the water temperature is 65ºc and th e pump is switched on ( P ).
Week programme Release R.1.3 UK 57 gis The cursor moves to the minute digits, which will blink. See Fi gure 8.12 . 7. Use H and L to select the minutes. In the example this is 45 . Confirm with E . The cursor move s to t he water temperature. See Fi gure 8.
Main menu 58 Instruction Manual BFC 8 gis The display shows the menu for the week program, see Figure 8.18 . The cursor points to the active period. 2. Scroll L to INSERT . Confirm with E . The sub-menu for adding a period will appe ar . See Figure 8 .
Week programme Release R.1.3 UK 59 gis 2. Scroll with L to PROGRAM OVERVIEW . Confirm with E . The display will show the week program sub-menu , see Figure 8.21 . 3. Scroll with L to DELETE . Confirm with E . 4. The displa y wi ll change as shown in Figure 8.
Main menu 60 Instruction Manual BFC 8 gis 8.6 Extra period 8.6.1 Introduction Use an extra period when you either want to have the appliance switch on and off for a cert ain peri od, either without modifying the active week program, or without taking the appliance out of OFF mode (frost protection active).
Settings Release R.1.3 UK 61 gis The cursor moves to the wa ter temperature. See Figure 8. 34 . Setting the water temperature 7. Use H and L to select the wate r temperature. In the example this is 75 . Confirm with E . The cursor moves to PUMP ON . See Figure 8.
Main menu 62 Instruction Manual BFC 8 gis 3. Scroll wi th L to the desired language. Confirm with E . The language is set. 8.7.3 Setting day and time Bring up the menu for entering the day and time via: 1. B : SETTINGS . Confirm with E . The display shows the menu for settings.
Settings Release R.1.3 UK 63 gis Ta b l e 8 . 2 shows the standard appliance specifications. Bring up the menu to display the appliance specificati ons via: 1. B : SETTINGS . Confirm with E . 2. Scroll with L to SPECIFICATIONS Confirm with E . The display shows the sub -menu for displaying appliance specificatio ns.
Main menu 64 Instruction Manual BFC 8 gis.
Introd uction Release R.1.3 UK 65 is 9 Service program 9.1 Introductio n The service program is used by the installer or service and maintenance engineer for: • Setting the hysteresis ; • Displayi.
Service program 66 Instruction Manual BFC 9 is Figure 9.3 shows an example of ‘Blocking errors’. In this case, the text HISTORIE OF ERRORS is followe d by (B) . Figure 9.4 shows an example of the ‘Lock out errors’. In this case, the text HISTORIE OF ERRORS is followe d by (L) .
Setting the disp lay contrast Release R.1.3 UK 67 is The service interv al is based on the num ber of burning hours. This can be set to 500, 1000 and 1500 hours. The standa rd setting for number of hours is 500. Once the preset number of hours is r eached, a message to this effect will appear .
Service program 68 Instruction Manual BFC 9 is.
Release R.1.3 UK 69 10 T roubleshooting 10.1 Introductio n A distinction is made between: • General errors General errors are not reported on the displa y . General errors are: - Gas smell - Display does not light up - Insufficient or no hot water .
is Release R.1.3 UK 70 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . 10.2 T roubleshooting t able for general errors T able 10.1 General errors (Sheet 1 of 3) Symptom Cause So lutio n Remark Gas smell Gas leak Wa r n i n g Immediately close the main gas valve.
is Release R.1.3 UK 71 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . Display is off Appliance is turned off. S tart-up the ap pliance. Se e ’7.2 St arting up’ No electric power present 1. Check whether the mains switch is ON.
is Release R.1.3 UK 72 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . 10.3 T roubleshooting t able for displayed errors Explosive ig nition Inco rrect supply pressure and/or burner pressure. Set the correct supply pressure and/o r burner pressure, see ’3.
is Release R.1.3 UK 73 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . T able 10.2 Displayed errors (Shee t 1 of 10) Code + Descrip tion Possible c ause Solution Remark S01 (blocking error) Open circuit from temperature sensor T 2 at bottom of tank.
is Release R.1.3 UK 74 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . S12 (blocking error) Short circuit from sensor 1 of temperature sensor T 1 at the top of the tank Short circuit in the sensor circuit Replace sensor T 1 .
is Release R.1.3 UK 75 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . F01 (blocking er ror) Defect in power supply circuit. Phase and neutral swapped in error . Connect the phase and the neutral correctly .
is Release R.1.3 UK 76 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . F03 (lock out error) The pressure switch fails to work correctly . Damaged wiring / Open circ uit 1. Check the wiring between the pressure switch and the controller .
is Release R.1.3 UK 77 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . F04 (lock out error) Three unsuccessful ignition attempts. No gas. 1. Open the main gas valve and/o r the gas valve before the gas control.
is Release R.1.3 UK 78 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . F05 (lock out error) T oo many flame errors have been signall ed. Incorrect roof or wall terminal. Recirculating flue gases. 1. Check that the correct roof or wall terminal has been fitted.
is Release R.1.3 UK 79 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . F09 (lock out error) W ater temperature protection. T emperature at the top of the tank exceeds 93°C. 1. Check that the circula tion pump (if present) is working.
is Release R.1.3 UK 80 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . F1 1 (lock ou t error) Flame detection with closed gas valve .
is Release R.1.3 UK 81 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . C02 (lock out error ) Error message from the water heater controller . Incorrect reference voltage from the AD converter . 1. Reset the ThermoControl.
is Release R.1.3 UK 82 Wa r n i n g Maintenance may only be performed by a qualifie d service and mainte nance engineer . C03 (blocking err or) Reset error . T oo many rese ts in too short a period. W ait for the error to disappear (maximum 1 hour). If the error does not disappear, the water heater controller must be replaced.
Introd uctio n Release R.1.3 UK 83 gs 1 1 Maintenance frequency 1 1.1 Introduction A service should be carried out at least once a year , both on the water sid e and on the gas side. Maintenance fre quen cy depends, among other things, on the water quality , the average bu rning time per day and the set water temperature.
Maintenance frequency 84 Instruction Manual BFC 11 gs.
Introd uctio n Release R.1.3 UK 85 s 12 Maintenance 12.1 Introductio n c Note Maintenance may only by carried out by an approved service and maintenance engineer. At each service, the appliance unde rgoes mai ntenance both on the water side and on the gas side.
Maintenance 86 Instruction Manual BFC 12 s The display will now show INTER NAL CHECK for about 10 seconds, and will then go to the main menu. 7. Activate the “ON mode” by goi ng through the following steps: - Press once on the DOWN button ( L ) to position the cursor beside ON , then press E .
Water-side mainte nance Release R.1.3 UK 87 s 12.3 W ater-side mainte- nance 12.3.1 Introd uction The following steps should be carried out on the water si de: 1. Checking the anodes . 2. Descaling and cleaning the tank . 3. Cleaning condensation water discharge .
Maintenance 88 Instruction Manual BFC 12 s 12.4.3 Cleaning the orifice 1. Detach the orifice. 2. Remove all contamination present in the orifice. 3. Fit the orifice. 12.4.4 Cl eaning heat ex change r 1. Detach the burner . 2. Clean the combustion ch amber of th e heat exchanger using a vacuum cleaner and a soft brush.
General warranty Release R.1.3 UK 89 gis 13 W arranty (Certificate) T o register yo ur warranty , you shou ld complete and return the enclosed warranty card after which a wa rranty ce rtificate will b e sent to you. This certificate gives the owner of a wate r heater supplied by A.
Warranty (Certificate) 90 Instruction Manual BFC 13 gis b. misuse, neglect (includ ing frost damage), modification, incorre ct and/or unauthorised use of the water heater and an y attempt to repair l eaks; c. contaminants or other substances having been allowed to enter the tank; d.
Release R.1.3 UK 91 A Appendices A.1 Introductio n This appendix contains: •T h e Electrical diagram BFC . •A Week progra m card . is.
Appendices 92 Instruction Manual BFC A is A.2 Electrical diagram BFC TERMINAL STRIP CONNECTIONS: A Earth N Neutral L 1 Phase inpu t of controller L 2 Phase inpu t of isolating transform er (primary si.
Release R.1.3 UK 93 A.3 Week program card Y ou can fill-in the week program card, cut it out and keep it near the appliance. ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -.
Release R.1.3 UK 94.
Index Release R.1.3 UK 95 gis IX Index A Alarm OUT connection - - - - - - - - - - - - - 33 ambient temperature - - - - - - - - - - - - - - 18 appliance display selectio n - - - - - - - - - - - - - - 6.
Index 0306 059 IX gis Instruction Manual BFC maintenance anode - - - - - - - - - - - - - - - - - - - 87 burner - - - - - - - - - - - - - - - - - - - 87 carrying out - - - - - - - - - - - - - - - - - 8.
Een belangrijk punt na aankoop van elk apparaat A.O. Smith 28 30 50 60 (of zelfs voordat je het koopt) is om de handleiding te lezen. Dit moeten wij doen vanwege een paar simpele redenen:
Als u nog geen A.O. Smith 28 30 50 60 heb gekocht dan nu is een goed moment om kennis te maken met de basisgegevens van het product. Eerst kijk dan naar de eerste pagina\'s van de handleiding, die je hierboven vindt. Je moet daar de belangrijkste technische gegevens A.O. Smith 28 30 50 60 vinden. Op dit manier kan je controleren of het apparaat aan jouw behoeften voldoet. Op de volgende pagina's van de handleiding A.O. Smith 28 30 50 60 leer je over alle kenmerken van het product en krijg je informatie over de werking. De informatie die je over A.O. Smith 28 30 50 60 krijgt, zal je zeker helpen om een besluit over de aankoop te nemen.
In een situatie waarin je al een beziter van A.O. Smith 28 30 50 60 bent, maar toch heb je de instructies niet gelezen, moet je het doen voor de hierboven beschreven redenen. Je zult dan weten of je goed de alle beschikbare functies heb gebruikt, en of je fouten heb gemaakt die het leven van de A.O. Smith 28 30 50 60 kunnen verkorten.
Maar de belangrijkste taak van de handleiding is om de gebruiker bij het oplossen van problemen te helpen met A.O. Smith 28 30 50 60 . Bijna altijd, zal je daar het vinden Troubleshooting met de meest voorkomende storingen en defecten #MANUAl# samen met de instructies over hun opplosinge. Zelfs als je zelf niet kan om het probleem op te lossen, zal de instructie je de weg wijzen naar verdere andere procedure, bijv. door contact met de klantenservice of het dichtstbijzijnde servicecentrum.
