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Figure 18: Typical Instantaneous Water Heating System
Table 8: Flow and Pressure Drop at a Given Temperature
Rise (Copper, Copper Nickel Heat Exchanger)
Heat
Exchanger
Model
Water
Content
(USG)
DF500
2.5
DF750
2.9
DF1100
3.5
DF1200
3.5
DF1500
6.3
DF1750
6.6
DF2000
7.0
DF2500
7.5
DF3000
8.0
DF3500
8.4
DF4000
8.9
DF4500
9.3
DF5000
9.7
DF4504
9.3
DF5004
9.7
DF6004
10.2
Table 9: Flow and Pressure Drop at a Given
Temperature Rise (Stainless Steel Heat Exchanger)
Heat
Exchanger
Model
Water
Content
(USG)
DF500
2.5
DF750
2.9
DF1100
3.5
DF1200
3.5
DF1500
5.6
DF1750
5.9
DF2000
6.2
DF2500
6.6
DF3000
7.1
DF3500
7.5
DF4000
7.9
DF4500
9.3
DF5000
9.7
DF4504
9.6
DF5004
10.1
DF6004
11.1
30°F (16.7 °C)
35°F (19.4°C)
Temp Rise
Temp Rise
USGPM
USGPM.
∆P
(min.
(min.
Ft.
flow)
flow)
28.0
0.7
24.0
42.0
1.4
36.0
61.6
2.7
52.8
68.0
2.9
58.3
83.9
1.9
71.9
97.9
2.9
83.9
111.9
4.1
95.9
139.9
6.1
119.9
167.9
8.4
143.9
198.1
12.7
169.8
226.9
17.0
194.5
254.7
21.9
218.3
282.9
27.6
242.5
254.6
15.3
218.3
283.0
19.6
242.5
339.5
31.8
291.0
20°F (11.1 °C)
25°F (14°C)
Temp Rise
Temp Rise
USGPM
USGPM.
∆P
(min.
(min.
Ft.
flow)
flow)
42.0
1.5
33.6
63.0
3.0
50.4
92.4
5.9
73.9
102.0
4.4
81.6
125.9
8.3
100.7
135.0
12.5
117.5
167.9
6.7
134.3
209.9
8.4
167.9
251.9
9.9
201.5
297.2
11.8
237.8
340.4
17.1
272.3
382.1
28.4
305.7
424.4
31.1
339.5
382.1
20.4
305.7
424.4
23.5
339.5
509.3
38.0
407.4
4.8
CONDENSER HEAT RECOVERY
MODULE (CHRM)
The DynaFlame® ALL Stainless Steel CHRM is mounted
in a stainless steel inner jacket chamber at the right side of
the appliance facing the appliance. The CHRM is
constructed from all stainless steel headers and special
multiple horizontal stainless tubes. This CHRM is
designed to maximize heat transfer efficiency by fully
condensing flue products and is suitable to resist the low
PH of condensate.
The CHRM must be supplied with adequate water flow at
all times during operation. Do not operate the appliance
with the CHRM piped out or isolated.
The CHRM is mounted in the discharge of the flue
products from the primary heat exchanger. This allows
additional heat to be absorbed from the flue products
exhausted from the combustion process. If isolation valves
are provided on the CHRM, the provision of a relief valve
at the outlet of the CHRM is recommended. This valve is
to be sized at minimum for 10% of the input of the
∆P
appliance and is to be piped to drain.
Ft.
0.5
1.0
When cold water supply with temperatures less than 130
2.1
ºF (54 ºC) passes through the CHRM it will cool the flue
products below dew points resulting in the formation of
2.2
condensation. Furthermore, the volumetric flow rate of the
1.4
flue gases will be reduced. Never supply water at less
2.2
o
than 35
F to the CHRM.
3.1
4.6
The appliance CHRM loop may be used in condensing
7.0
mode for a variety of application including domestic hot
9.5
water and hydronic space heating. Recommended piping
12.7
arrangement
recommended flows through the CHRM is summarized in
16.4
Table 10.
20.7
11.4
Figure 19: Typical Condensing System
14.9
24.1
∆P
Ft.
1.0
1.9
4.0
2.8
6.0
8.0
4.5
Condensate from the DynaFlame® must be treated before
5.4
being discharged to drain. PH level of the condensate is to
6.3
be checked regularly and the neutralizing medium is to be
7.4
replaced as required. A neutralizing cartridge is available
11.0
from the factory. The condensing DynaFlame® must be
17.5
vented using only special venting type AL29-4C stainless
20.0
steel or equivalent, please follow instructions detailed
13.3
below.
15.4
24.5
is
shown
in
Figure
18
Maximum
20
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