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Gas-fired, central heating only, electronic ignition

Light oil fired, with 95 litre DHW calorifier

High efficiency boilers designed heating large domestic application.  Ideal for installation in any boiler room. Cast-iron boiler body with stainless steel atmospheric burner, stabilised flame and ionisation control. Total shutdown function and completely protected control panel. For the production of domestic hot water, the boiler can be combined with the ATRB calorifier or any other calorifier; a kit can be fitted to use an electronic temperature controller. Available in 4 open flue versions. Duties from 43.6 to 71.1 kW. The ATR boilers can be installed in modules of two or three boilers: this solution ensures high-efficiency capacity control and division of the thermal load on each boiler.

Product advantages

  • Ideal for the heating requirements of large utilities.
  • Can satisfy domestic hot water requirements in combination with Riello ATRB calorifier
  • Management of (up to three) multi-zone systems using the special accessory kit. Boiler cascade operation available as optional.
  • Built-in panel for temperature control functions.
  • LPG kit, available as optional.

Installation/maintenance advantages

  • Control panel connected using the special kit to any calorifier or regulation temperature controller. Electrical maintenance from the front: wiring on the terminal block that is easily removable from the new control panel.
  • Index of protection of control panel IP40.
  • Reset function and alarm messages directly on the control panel.
  • Gas cock supplied. Built-in gas pressure stabilizer. Completely protected control panel.
  • Ready for connection to a room thermostat and a central heating system pump.

Technical Data

Characteristics ATR 44 IN ATR 52 IN ATR 64 IN ATR 71 IN

Input kW 48,3 57,9 70,5 79

Mcal/h 41,55 49,8 60,6 67,95

Output kW 43,6 52,2 63,5 71,1

Mcal/h 37,5 44,9 54,6 61,15

Efficiency at maximum output % 90,3 90,2 90,1 90

Efficiency at power 30% output % 90,1 90,1 90 90

Heat losses through flue gas burner lockout % 0,24 0,25 0,5 0,25

Heat losses through flue gas 100 % load % 7,35 8,5 7,79 8,38

Heat losses through insulation gas burner lockout % 0,84 0,82 0,76 0,8

Heat losses through insulation gas 100 % load % 2,35 1,3 2,11 1,62

Flue gas temperature (Δt) oC ~110 ~110 ~120 ~130

Flue gas mass flow rate kg/s 0,041 0,048 0,053 0,06

CO2 * % 5,00 4,80 5,75 5,70

CO * less than ppm 26 22 31 52

NOx mg/kWh <260 <260 <260 <260

Water-side pressure drop (ΔT 10oC) mbar 28 32 41 60

Pa 2800 3200 4100 6000

Water-side pressure drop (ΔT 15oC) mbar 13 14 18 22

Pa 1300 1400 1800 2200

Water-side pressure drop (ΔT 20oC) mbar 7 8 10 12

Pa 700 800 1000 1200

Resistance of flue (draught required) mbar 0,05 0,05 0,05 0,05

Pa 5 5 5 5

Air flow-rate N m 3/h 113,16 132,12 143,96 152,49

Boiler capacity l 24 28,5 33 38

Max. working pressure (central heating) bar 3 3 3 3

kPa 300 300 300 300

Power supply V/50 Hz 230 230 230 230

Power input W 27 27 27 27

Index of protection IP XOD(40) XOD(40) XOD(40) XOD(40)

Weight kg 166 190 225 251

* With parameters referred to 0% residual O2 in the exhaust gases and with atmospheric pressure at sea level.

Dimensions (mm)

Models ATR 44 IN ATR 52 IN ATR 64 IN ATR 71 N

A mm 780 701 784 867

B mm 98 260 302 342

C mm - 1475 1475 1700

Flue gas outlet diameter mm 180180 180 180 200

Water circuit

1   CH system drain cock
G  Gas mains fitting
MI Central heating flow
RI Central heating return

Water and gas connections

The ATR IN packaged boilers are designed and developed to be installed in central heating systems and for the production of domestic hot water if connected to suitable appliances.

A shunt ( by-pass) pump must be fitted to avoid damage to the boiler on first ignition and on re-ignition after idle periods. The pump must ensure, during the operation of the system, a flow-rate between 20 and 30% of the total. It must guarantee a water return temperature > 50°C and it should shut down with a delay of at least three minutes, at the beginning of long boiler shutdown (overnight, on weekends etc.).

Models ATR 44 IN ATR 52 IN ATR 64 IN ATR 71 N

MI - central heating flow ø 1"1/4 1"1/4 1"1/4 1"1/4

RI - central heating return ø 1"1/4 1"1/4 1"1/4 1"1/4

G - gas mains ø (M) 1/2" 1/2" 3/4" 3/4"

Control Panel

Key

  1. System thermometer
  2. Function selector
    1. Boiler off
    2. Boiler on
    3. Reset electronic flame control device
    4. Automatic mode selector (*)
  3. Boiler thermostat
  4. Manual high limit thermostat reset
  5. Power signal (green)
  6. Burner lockout signal (red)
  7. Function indicators

(*) Select only if using the temperature control kit.

Flue Accessories

Flue Header to connect 2 ATR 44 IN boilers

Flue Header to connect 2 ATR 52 IN boilers

Flue header to connect 2 ATR 71 IN boilers

Flue Header to connect 2 ATR 44 IN or 2 ATR 64 IN boilers

Flue header to connect 3 ATR 71 IN boilers

Key

  1. 90o bend fitting diam. 180mm
  2. Fitting dia. 180/260
  3. Pipe dia. 180×700
  4. 90o bend fitting dia. 200mm
  5. Fitting dia. 200/300
  6. Fitting dia. 260/300
  7. Fitting dia. 300/350

The flue can be fitted with the outlet on the right or on the left.

Riello ATR 44-52-64-71 IN

Description for summary specifications

High efficiency floor standing hot water boiler manufactured from cast-iron elements.

Natural draught open flue combustion chamber with stainless steel, stabilised flame atmospheric gas burner with electronic ignition. Maximum working pressure 3.5 bar.

Description for specifications

The high efficiency hot water generator, type B11BS and category II 2H3+, is made up of:

  • Light grey steel external casing panels, assembled with quick fit couplings, removable for servicing
  • high density fibre-glass wool lagging, protected by aluminium sheet
  • boiler body manufactured from assembled cast-iron elements
  • low pressure drop combustion chamber designed to generate a highly turbulent motion in order to produce an efficient gas to water heat transfer for higher efficiency
  • stainless steel atmospheric gas burner with stabilised flame
  • ignition and flame ionisation control device
  • instrument panel protected by fold-back cover to prevent accidental tampering, including: control devices, on/off switch, power indicator, exhaust safety indicator, burner lockout signal and connectors for the electrical connections, which must be completely wired, ready for connection to the mains power supply, the room thermostat and the central heating system pump
  • control thermostat and safety thermostat with manual reset for boiler water temperature, connected to separate lines
  • Boiler thermometer
  • gas valve assembly, including: safety valve, control valve, pressure regulator and gas filter
  • gas pressure switch (ATR 64 IN – ATR 71 IN)
  • rear draught diverter system with vertical flue gas outlet
  • flue outlet thermostat with manual reset
  • operation with total shutdown logic
  • system drain cock
  • probe well
  • maximum working pressure 3.5 bar
  • compliant with CEI standards
  • index of protection IP40
  • compliant with 90/396/EEC directive (gas) – CE mark
  • compliant with 89/336/EEC directive (electromagnetic compatibility)
  • compliant with 72/23/EEC directive (low voltage)
  • compliant with 92/42/EEC directive (efficiency)

Material supplied

  • LPG Kit
  • draught diverter for ATR 52 IN – 64 IN – 71 IN
  • lifting eyes
  • installation, use and maintenance manual
  • hydraulic test certificate
  • product identification plate

Accessories

The following accessories are available separately, upon request.

  • Gas valve kit for LPG
  • Electrical interface kit for ATRB calorifier
  • Temperature control interface kit
  • Water connection kit for ATRB 120
  • Multi-zone electrical kit
  • Total shutdown kit (*)

(*) Only if installed with separate calorifier