EP0403422A2 - Procédé pour la protection d'une installation d'eau chaude contre gel et installation de production d'eau chaude pour sa mise en oeuvre - Google Patents

Procédé pour la protection d'une installation d'eau chaude contre gel et installation de production d'eau chaude pour sa mise en oeuvre Download PDF

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Publication number
EP0403422A2
EP0403422A2 EP90710014A EP90710014A EP0403422A2 EP 0403422 A2 EP0403422 A2 EP 0403422A2 EP 90710014 A EP90710014 A EP 90710014A EP 90710014 A EP90710014 A EP 90710014A EP 0403422 A2 EP0403422 A2 EP 0403422A2
Authority
EP
European Patent Office
Prior art keywords
burner
water heating
air
drive
heating system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90710014A
Other languages
German (de)
English (en)
Other versions
EP0403422A3 (fr
EP0403422B1 (fr
Inventor
Dietmar Manz
Franz-Josef Wertenbruch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nv Vaillant Sa
VAILLANT B.V.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Vaillant NV
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vaillant Austria GmbH, Vaillant NV, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd filed Critical Vaillant Austria GmbH
Publication of EP0403422A2 publication Critical patent/EP0403422A2/fr
Publication of EP0403422A3 publication Critical patent/EP0403422A3/fr
Application granted granted Critical
Publication of EP0403422B1 publication Critical patent/EP0403422B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/0095—Devices for preventing damage by freezing

Definitions

  • the invention initially relates to a method for protecting a water heating system against freezing of the water heater operated with a burner independent of the ambient air.
  • the object of the invention is to develop a method which does not require such an outside temperature sensor and which can be carried out using simple technical means.
  • the drive of the burner fan is stopped for a predetermined minimum period of time after a predetermined period of time starting with the failure of the air monitor to signal.
  • This method therefore makes it unnecessary to record the respective actual outside temperature and moreover ensures that sporadically occurring errors in the air monitor, for example the clamping of a pressure cell, do not lead to a permanent blockage of the burner operation.
  • the invention also extends to a method suitable for carrying it out Water heating system, consisting of a water heater with a forced draft burner, preferably a gas burner, which is fed with combustion air via a fan and a heat exchanger, and a preferably pressure-sensitive air monitor, for example a pressure socket, arranged in the combustion air duct, and a general supply of fuel to the burner and control of combustion air, inter alia, control connected to the air monitor and the fan drive via control lines.
  • a forced draft burner preferably a gas burner
  • a heat exchanger preferably preferably pressure-sensitive air monitor, for example a pressure socket, arranged in the combustion air duct, and a general supply of fuel to the burner and control of combustion air, inter alia, control connected to the air monitor and the fan drive via control lines.
  • a circuit with timing elements connected to the general control via a control line and connected to a clock oscillator, is provided in order to maintain the above two time periods.
  • a circuit can contain two counters / comparators which are linked to one another via a bistable multivibrator (flip-flop) and AND and OR gates.
  • a water heating system for example a circulation water heating system, comprises a water heater, generally designated 1, with a burner 3, for example a gas burner, which heats a heat exchanger 2 and is supplied with fuel, for example fuel gas, and combustion air.
  • a burner for example a gas burner, which heats a heat exchanger 2 and is supplied with fuel, for example fuel gas, and combustion air.
  • This burner is independent of the ambient air, i.e. it draws its combustion air from the atmosphere and emits its exhaust gases there.
  • the combustion air is supplied from a combustion air duct 4 by means of a fan 5, the exhaust gases of the combustion chamber are discharged by this fan 5 via an exhaust duct 6.
  • the flow of the heat exchanger 2 is denoted by 7, the return by 8.
  • the fuel supply from a fuel supply line 9 is controlled by a solenoid valve 10, the drive 11 of which is connected via a control line 13 to a general control 12 which also serves to regulate and monitor the operation of the system.
  • a general control 12 which also serves to regulate and monitor the operation of the system.
  • an air monitor 14 arranged in the combustion air duct 4 for example a pressure can associated with a Venturi tube, connected via a control line 15.
  • a burner 3 is assigned a monitoring electrode 16, which is connected to the general control 12 via a control line 17 with a flame measuring amplifier 18 arranged therein.
  • a control line 19 extends from the general control 12 to an ignition device 20 and an ignition electrode 21.
  • a further control line 22 leads to a circuit 23 according to the invention, into which a control line 24 branches off from the control line 15 and from which a control line 25 for driving the blower 5 extends.
  • a clock oscillator 26 is assigned to this circuit 23, which is used for frost protection.
  • the system also includes a temperature sensor 27 which is connected to the general control 12 via a control line 28.
  • a branch line 30 branches off from the control line 22 at the branching point 29 to the branching point 31, in which a line 32 branches off to the negated input of the OR gate 33.
  • the branch Line 30 continues to the input of the AND gate 34, which is fed via an input line 35 from the clock oscillator 26.
  • the outputs 36 and 37 of the OR gate 33 and the AND gate 34 are connected to a first counter / comparator 38, specifically the OR gate 33 via a reset input 39.
  • the control line 22 branches at the branch point 40 a line 41 to the negated input of a further OR gate 42, which is connected via its other input and via line 43 to a line 44 which leads from the OR gate 33 to a second counter / comparator 45.
  • the output of the OR gate 42 is connected to the reset input of a bistable multivibrator (flip-flop) 47, the set input of which is connected via a line 48 to the output of the counter / comparator 38.
  • a non-inverted output 49 of this flip-flop 47 connects it to the branch point 51 located on line 50.
  • the other inverted output 52 of this flip-flop 47 is connected via a line 53 to the reset input of the second counter / comparator 45.
  • a line 55 connects the oscillator 26 to the via a branch point 54 of the line 35 Input of an AND gate 56, which in turn is connected via its output line 57 to the input of the second counter / comparator 45.
  • Another AND element 58 arranged in line 22 is connected with its negated input to AND element 56 via line 50 already mentioned above and branch point 51.
  • the overflow or underflow of the counters / comparators 38 and 45 is prevented by measures not shown.
  • the function of the circuit 23 can also be implemented as a program of a microprocessor and results from its structure in the sense of the invention as follows: If the switch contact of the air monitor 14, for example a pressure socket, remains open as a result of a fault even with sufficient air throughput, the drive of the Blower 5 (and thus burner operation) interrupted for a predetermined period of time, for example for a period of about 15 minutes, but only if the blower 5 was in operation for a predetermined period of time, for example 3 minutes, without feedback from the air watchman 14.
  • this shutdown and blocking of the blower and burner operation is ended before the specified minimum duration has expired, if, for example, as a result the completion of a tap, no more heat is requested.
  • this prevents excessive cooling of the heat exchanger 2 in the event of a faulty behavior of the air monitor 14, but on the other hand, sporadic errors, for example a mere one-time clamping of a pressure cell, do not permanently block the burner operation.
  • the blower 5 is only switched off independently of the level of the outside temperature if this blower has been in operation for a measurable period of time without the air monitor 14 reporting back.
  • this switch-off is reversed after a specified period of time or after the heating requirement ceases to exist, for example after a domestic water tap has ended. Then, if there is again a need for heat, another attempt to start the burner operation can take place.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
EP90710014A 1989-06-13 1990-06-13 Procédé pour la protection d'une installation d'eau chaude contre gel et installation de production d'eau chaude pour sa mise en oeuvre Expired - Lifetime EP0403422B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1440/89 1989-06-13
AT0144089A AT397572B (de) 1989-06-13 1989-06-13 Verfahren zum schutz einer wasserheizanlage gegen ein einfrieren, wasserheizanlage zu dessen durchführung sowie schaltung für eine solche wasserheizanlage

Publications (3)

Publication Number Publication Date
EP0403422A2 true EP0403422A2 (fr) 1990-12-19
EP0403422A3 EP0403422A3 (fr) 1991-04-17
EP0403422B1 EP0403422B1 (fr) 1994-03-30

Family

ID=3513934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90710014A Expired - Lifetime EP0403422B1 (fr) 1989-06-13 1990-06-13 Procédé pour la protection d'une installation d'eau chaude contre gel et installation de production d'eau chaude pour sa mise en oeuvre

Country Status (3)

Country Link
EP (1) EP0403422B1 (fr)
AT (2) AT397572B (fr)
DE (2) DE59005155D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368556B1 (en) 1994-06-28 2002-04-09 Akeda Dental A/S Apparatus for operational cleaning of dental handpieces

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1038743A2 (ru) * 1982-03-17 1983-08-30 Предприятие П/Я А-7080 Устройство автоматической защиты калорифера от замораживани
JPS59167646A (ja) * 1983-03-14 1984-09-21 Sanyo Electric Co Ltd 温水ボイラの制御装置
SU1180653A1 (ru) * 1984-04-23 1985-09-23 Предприятие П/Я В-2616 Система регулировани и защиты от замораживани калорифера приточно-вентил ционной установки

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368556B1 (en) 1994-06-28 2002-04-09 Akeda Dental A/S Apparatus for operational cleaning of dental handpieces

Also Published As

Publication number Publication date
EP0403422A3 (fr) 1991-04-17
DE4018985A1 (de) 1990-12-20
DE59005155D1 (de) 1994-05-05
AT397572B (de) 1994-05-25
ATA144089A (de) 1993-09-15
ATE103698T1 (de) 1994-04-15
EP0403422B1 (fr) 1994-03-30

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