Viessmann VITOCROSSAL 300, CT3-17, CT3-22, CT3-28, CT3-37 Technical Data Manual

Technical Data Manual

5285871v1.911/201

2

Model Nos. and pricing: see Price List

VVVVIIIITTTTOOOOCCCCRRRROOOOSSSSSSSSAAAALLLL 333300000000

Gas-fired condensing boiler

638 to 3361 MBH / 187 to 985 kW

Vitocrossal 300, CT3 boiler with
Vitotronic NR2 control

Product may not be exactly as illustrated.

Vitocrossal 300

CT3 Series

High efficiency, gas-fired condensing boiler

for natural gas or liquid propane
with vertical Inox-Crossal heat exchanger surfaces
of corrosion-resistant stainless steel.
For operation without low limit on boiler return water
temperature.
For closed loop hot water heating systems with maximum
supply water temperatures of 210°F / 99°C for a
maximum operating pressure of 30 psig.

Heating input: 638 to 3361 MBH

187 to 985 kW

Product Information

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VITOCROSSAL 300

The benefits at a glance:

H Vertical Inox-Crossal heating surfaces for

high operational reliability and long service
life.
– Easy dispersal of condensate through

vertical gas flues; therefore no
concentration of condensate.

– Increased self-cleaning effect through

smooth stainless steel surfaces.

H Highly efficient heat transfer and high

condensation rate through
– heat exchanger surfaces which intensely

turbulate the flue gas flow

– boiler water and hot gases flowing in

counterflow.

H Efficiency up to 98.3% through intensive

condensation. The flue gas temperature is
only approx. 9 - 27°F / 5 - 15°C above
boiler return temperature.

H Clean combustion – through perfect match

of burner and boiler, low combustion
chamber loading and straight-through
combustion chamber.

H Two return connections – providing

separate connection for heating circuits
with lower return temperature. This leads
to increased hot gas condensation.

H Easy handling in boiler rooms through

particularly low build height and weight;
also available in sections.

H Easy installation and elimination of wiring

mistakes with Viessmann prewired plug-in
system.

H Heating boiler, heating system control,

domestic hot water storage tank and all
other Viessmann system technology
components are co-ordinated to one
another. All components are
design-matched for quick installation.

H Economical and safe heating system

operation through Vitotronic digital control
system with communication capability.
Tailored to every need, covering all known
control strategies and applications.
Standard LON BUS for complete
integration into building management
systems.
Possible integration into the Vitocontrol
control panel.

Vitocrossal 300 boiler efficiency dependent on system
heating water return temperatures and load conditions

2 VITOCROSSAL 300, CT3

Product Information

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Cut-Away Section

Two return Stainless steel Stainless steel Wide diameter Highly effective, 4”
connections arranged Inox-Crossal heat water-cooled water walls – proper wrap-around insulation
above each other exchanger surfaces combustion chamber gravity circulation

VITOCROSSAL 300, CT3 3

Product may not be exactly as illustrated

Technical Data

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Technical data

Boiler model CT3- 17 22 28 37 46 57 72 89
Input MBH 638 846 1071 1389 1726 2160 2702 3361

kW 187 248 314 407 506 633 792 985

*1

Output

Combustion efficiency

MBH 626 827 1044 1350 1675 2094 2616 3252

kW 183 242 306 396 491 614 767 953

%

98.3

97.8

97.4

97.2

97.1

96.9

96.8

96.7

Thermal efficiency

Boiler output at

80/60° C - 176/140° F

70/50° C - 158/122° F

40/30° C - 104/86° F

Boiler standby loss

at maximum input
80/60° C - 176/140° F

70/50° C - 158/122° F

40/30° C - 104/86° F

Dimensions - boiler as shipped

(p)Length (door removed)

(q)Width 1 (max. shell width)

(r)Height*2(max.)

Overall dimensions

(s)Overall length

(t)Overall width (incl. insulation

and control)

MBH

kW

MBH

kW

MBH

kW

Btu/h

Btu/h

Btu/h

inches

mm

inches

mm

inches

mm

inches

mm

inches

mm

%

W
%

W
%

W
%

98.1

554

162.3
576

168.7
607

177.8

2566

752

0.40

2139

627

0.34
856
251

0.13

59¾

1516

27

684

697/
1773

64¼

1636

40

1016

97.7

734

215.3
763

223.7
805

235.8

2818

826

0.33

2347

688

0.28
938
275

0.11

62¾

1594

27

684

8

71d

1808

67½

1714

40

1016

97.4

930

272.6
966

283.2

1019

298.6

3064

898

0.29

2552

748

0.24

1020

299

0.10

66

1675

27

684

71¼

1811

70½

1795

40

1016

97.2

1206

353.3
1253

367.1
1321

387.1

3583
1050

0.26

3047

893

0.22

1143

335

0.08

69

1751

31½

800

79f

2023

73½

1871

44½

1132

97.1

1502

440.2
1561

457.4
1645

482.2

4299
1260

0.25
3583
1050

0.21
1433

420

0.08

72¼

1829

31½

800

79f

2023

76¾

1949

44½

1132

96.9

1879

550.7
1953

572.2
2059

603.2

5240
1536

0.24
4367
1280

0.20
1747

512

0.08

78¼

1985

31¼

800

79f

2023

83

2105

44½

1132

96.8

2351

689.0
2443

716.0
2575

754.8

5753
1686

0.21
4794
1405

0.18
1918

562

0.07

82½

2095

37½

951

88

2235

85½

2172

49

1249

96.7

2924

857.0
3038

890.4
3203

938.7

6633
1944

0.20
5753
1686

0.17
2211

648

0.07

90

2289

37½

951

88

2235

93¼

2366

49

1249

(u)Overall height (to top of

installed

inches

mm

header)

(v)Width (upper with jacketing)

inches

mm

(w)Width

(lower with jacketing)

inches

mm

Boiler support frame

(x)Length

inches

mm

(y)Width

inches

mm

(z)Height

inches

mm

Weight

boiler shell

lbs

kg

front cone

(includes combustion

chamber door)

lbs

kg

Overall weight

complete with insulation and
control (less burner)

*1

Output ratings are based on the IBR BTS-2000 “method to determine efficiency of commercial space heating boilers”.

*2

Boilers CT3-17, 22, 28 are shipped with header attached (u) - see overall height dimensions and add 4” (100 mm) for the wood blocks
as per transportation height.

lbs

kg

4 VITOCROSSAL 300, CT3

797/
2027

34½

874

31½

798

35¼

895

27¼

690

2¾

70

1012

459
413
187

1228

557

8

81d

2062

34½

874

31½

798

38e

975

27¼

690

2¾

70

1114

505
413
187

1352

613

81¼

2065

34½

874

31½

798

41½

1055

27¼

690

2¾

70

1202

545
413
187

1455

660

935/

2370

47¼

1200

32½

1671

1962

39

990

36

914

800

2¾

70

758
490
222

890

16

935/

16

935/

2370

39

990

36

914

50

1270

32½

800

2¾

70

1759

798
490
222

2064

936

16

2370

39

990

36

914

56¼

1430

32½

800

2¾

70

1995

905
490
222

2322
1053

101¾

2585

45d

1147

39

990

56¼

1430

35½

900

2¾

70

2706
1230

600
273

3014
1370

101¾

2585

45d

1147

39

990

64d

1630

35½

900

2¾

70

3014
1370

600
273

3344
1520

Technical Data

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Technical data (continued)

Boiler model CT3- 17 22 28 37 46 57 72 89

Boiler water content USG 71.3 78.2 87.2 129.5 140.8 150.6 199.2 221.9

ltr 270 296 330 490 533 570 754 840

Heat exchanger surface

water-cooled ft.

Max. operating temperature °F 210

Max. operating pressure psig 30

Flue gas resistance “w.c. 0.40 0.56 0.64 0.80 0.88 1.08 1.20 1.32

Boiler connections

boiler supply (BS)
& return (BR1)

Boiler return (BR2)*

3

Safety supply

Boiler drain
Condensate drain

Vent pipe

internal Ø inches

Flue gas values*

4

Temperature (at a return
temperature of 86°F / 30°C)

- at rated input

- at partial load

Temperature (at a return
temperature of 140°F / 60°C)

Mass flow rate (of flue gas)

Gas volume of combustion
chamber and heat exchanger

Pressure

at boiler flue outlet

- at partial input

- at maximum input

*3

Boiler has two return connections - the heating return with the lower temperature should be connected to the boiler return BR1.

*4

Values for calculating the size of the flue system based on 10 % CO2for natural gas.
Flue gas temperatures measured as gross values at 68ºF / 20 ºC combustion air temperature.
The details for partial load refer to an output of 30 % of rated input. Calculate the flue gas mass flow rate accordingly when the
partial load differs from that stated above (subject to the burner mode).

"

For information regarding other Viessmann System Technology componentry, please reference documentation of respective product.

2

2

m

85.0 107.6 123.8 176.5 200.2 245.4 316.5 383.2

7.9 10.0 11.5 16.4 18.6 22.8 29.4 35.6

°C 99

kpa 207

Pa 100 140 160 200 220 270 300 330

inches

mm

inches

mm

inches

mm
inches
inches

mm

°F

°C

°F

°C

°F

°C

lbs/h

kg/h

ft.

m

Pa
Pa

3
3

2½

65

50

1¼

32

201

113

45

104

40

167

75
704
320

8.83

0.250

±0

2½

65

2

2

50

1¼

32

1

½

8

1

½

8

201

113

45

104

40

167

75
928
422

9.92

0.281

-3

-3

-4

80

50

51

201

113

45

104

40

167

75

1179

536

12.00

0.340

±0

3

2

2

1

½

8

-2

100

75

50

10

251

113

45

104

40

167

75

1531

696

15.90

0.450

±0

4

3

2

1

½

-5

100

75

50

10

251

113

45

104

40

167

75

1903

865

18.40

0.521

±0
±0

4

3

2

1

½

100

75

50

10

251

113

45

104

40

167

75
2380
1082

21.54

0.610

±0
±0

4

5

125

3

4

100

2

2½

65

1

½

1

½

12

301

113

45

104

40

167

75
2979
1354

40.61

1.150

±0
±0

125

100

2½

65

12

301

113

45

104

40

167

75
3705
1684

42.73

1.210

±0
±0

5

4

1

½

VITOCROSSAL 300, CT3 5