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e)
Check inlet temperature after 5 minutes and make final
adjustments.
f)
Remove handle of balancing valve to prevent
tempering.
Note: For applications where large volumes of water are
heated from ground water temperatures to process
temperatures, it will be necessary to provide a modulating
three way valve or thermostatic valve in lieu of a fixed
bypass line.
4.7
INSTANTANEOUS WATER HEATER (non-
condensing)
An instantaneous water heater is designed to deliver hot
water without the use of a storage tank. It is suitable for
applications with variable load such as restaurants,
condominiums, apartments and motels and typically used in
conjunction with tempering valves to achieve temperature
control. In some applications it may be appropriate to
provide a flow through tank to act as a buffer. Consult
factory for recommendations. (See Figure 10)
Figure 15: Typical Instantaneous Water Heating
Table 8: Flow and Pressure Drop at a Given
Temperature Rise
30° F (16.7 ° C)
Heat
Exchanger
Model
Water
USGPM
Content
(min.
(USG)
DF500
2.5
DF750
2.9
DF1100
3.5
DF1200
3.5
DF1500
6.3
DF1750
6.6
DF2000
7.0
111.9
DF2500
7.5
139.9
DF3000
8.0
167.9
DF3500
8.4
198.1
DF4000
8.9
226.9
DF4500
9.3
254.7
DF5000
9.7
282.9
DF4504
9.3
254.6
DF5004
9.7
283.0
DF6004
10.2
339.5
19
System
35° F (19.4° C)
Temp Rise
Temp Rise
USGPM.
∆P
(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
4.1
95.9
6.1
119.9
8.4
143.9
12.7
169.8
17.0
194.5
21.9
218.3
27.6
242.5
15.3
218.3
19.6
242.5
31.8
291.0
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 appliance and is to be
piped to drain.
When cold water supply with temperatures less than 130 ºF
(54 ºC) passes through the CHRM it will cool the flue
products below dew points resulting in the formation of
condensation. Furthermore, the volumetric flow rate of the
flue gases will be reduced. Never supply water at less than
o
35
F to the CHRM.
The appliance CHRM loop may be used in condensing
mode for a variety of application including domestic hot
water and hydronic space heating. Recommended piping
arrangement is shown in Figure 11 Maximum
recommended flows through the CHRM is summarized in
Table 10.
Figure 16: Typical Condensing System
∆P
Ft.
0.5
1.0
2.1
2.2
1.4
2.2
3.1
4.6
Condensate from the Dynaflame must be treated before
7.0
being discharged to drain. PH level of the condensate is to
9.5
be checked regularly and the neutralizing medium is to be
12.7
replaced as required. A neutralizing cartridge is available
16.4
from the factory. The condensing Dynaflame must be
vented using only special venting type AL29-4C stainless
20.7
steel or equivalent, please follow instructions detailed
11.4
below.
14.9
24.1
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