Modular Boiler Submittal Data
LZDF SERIES—
Dual Fuel/Steam
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.
Standard Equipment
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).
Standard Equipment
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
Ratings
Model No.
No.
of
Htg.
Mods
Input
MPH
Gross
Output
MPH
†
Comb.
Efficiency
Net
Output
MPH
†
Sq. Ft.
Steam
‡
Horse-
power
Firing
Rate
GPH*
Input
MPH
Gross
Output
MPH
Comb.
Efficiency
Net
Output
MPH
†
Sq. Ft.
Steam
‡
Horse-
power
Boiler
Water
Content
(gal)
Weight
with
Water
Recom-
mended
Header
Size
I=B=R
RATINGS FOR GAS
RATINGS FOR OIL
I=B=R
Dual Fuel Caravan ratings and dimensions/steam models–LZDF Series
®
