Slant/Fin LZDF series Leaflet

Modular Boiler Submittal Data

A Caravan modular boiler system con-
sists of two or more compact boilers that
offer significant advantages in terms of 
installed cost, efficiency and reliability.
Caravan systems are based on step-firing
just enough modules to meet heating 
demands. LZDF systems are available in
620,000 to multi-million Btuh gross input.
For additional information, see Caravan
Engineering Manual, pub. C-30.

One per module unless otherwise noted
Pre-assembled heat exchanger with 

insulated jacket.

Dual fuel gas/oil burner with oil valve, gas

regulator, gas valve, flame safeguard
with UV scanner and on-off fuel transfer 
switch (unmounted). Gordon-Piatt burner 
model #S4.1-GO has intermittent gas 
pilot to light oil and/or gas main flame.

Module pressure gauge and siphon 

(unmounted).

System pressure gauge and siphon

(unmounted, one per system).

*

Light oil, 140,000 Btu per gallon.

‡ Based on 150 Btuh per square foot E.D.R. at 170°F average water temperature.

†

Net ratings are based on piping and pick-up allowance of 1.33. Slant/Fin
should be consulted before selecting a boiler for installation having unusual

§ Modules in excess of 8 are piped in parallel in two or more banks.

piping and/or pick-up requirements. For higher elevations, input may need to
be reduced.

LZDF-600-2-5

2

620

500

83.30

375

1563

14.9

4.30

602

500

85.90

375

1563

14.9

21.4 1506

3"

LZDF-750-2-6

2

750

592

83.20

444

1850

17.7

5.20

728

592

85.80

444

1850

17.7

25.2 1710

3"

LZDF-850-2-7

2

798

620

82.90

466

1946

18.6

6.00

840

674

85.50

506

2108

20.1

29.0 1918

3"

LZDF-900-3-5

3

930

750

83.30

563

2346

22.4

6.40

896

750

85.90

563

2346

22.4

32.1 2259

3"

LZDF-1100-3-6

3

1125

888

83.20

666

2775

26.5

7.80 1092

888

85.80

666

2775

26.5

37.8 2565

5"

LZDF-1300-3-7

3

1197

930

82.90

699

2917

27.9

9.00 1260 1011

85.50

758

3158

30.2

43.5 2876

5"

LZDF-1700-4-7

4

1596

1240

82.90

932

3888

37.2 12.00 1680 1348

85.50 1018

4242

40.3

58.0 3834

6"

LZDF-2100-5-7

5

1995

1550

82.90 1165

4963

46.5 15.00 2100 1685

85.50 1298

5408

50.3

72.5 4794

6"

Module pressure re-

lief valve, ASME
(unmounted) 15 psi.

Double swing draft 

regulator (unmounted).

Flue brush.
Drain cock (unmounted).
Water level sight glass

(unmounted).

Dual fuel changeover thermostat.
Internal tankless heaters.
Two-stage fuel pump in place of one-
stage fuel pump.
ASME Package—includes:
67 Low water cutoff (one per module)
PA404A Pressure control (one per mod.)
67M Low water cutoff (one per system)
L4079B Manual reset pressure 

MPH †

MPH †

‡

MPH †

‡

®