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Figure indicating D1, D
Diameters D
EFW 85
1 tank
2 tanks
EFW 105
1 tank
2 tanks
EFW 125
1 tank
2 tanks
EFW 155
1 tank
2 tanks
Table C: diameters connection pipes
The final step is selecting the pump for each boiler. In table D below, a pump selection is made for every configu-
ration from tables A, B and C. When applying this pump, the maximum allowable distance between water heat-
ers and tanks is expressed as V
connecting pipes must be subtracted. These resistances are expressed as equivalent lengths and can be found in
table E
Pump codes and maximum distance V
EFW 85
1 tank
2 tanks
EFW 105
1 tank
2 tanks
EFW 125
1 tank
2 tanks
EFW 155
1 tank
2 tanks
Table D: Pump advice and corresponding maximum length V
*
X
: single boiler and tank, see paragraph 8.1.1 for pipe lengths.
- : A - in the table doesn't necessarily mean that the corresponding installation cannot be built. If it can, it will
need specific design effort and pump selection. Please consult Lochinvar technical support for advice.
and D
T
( = Common pipework between water heaters and tanks)
number of cascaded water heaters
ΔT = 16.5 °C
1
2
42 x 1.5
54 x 1.5
42 x 1.5
54 x 1.5
number of cascaded water heaters
ΔT = 16.5 °C
1
2
42 x 1.5
54 x 1.5
42 x 1.5
54 x 1.5
number of cascaded water heaters
ΔT = 16.5 °C
1
2
42 x 1.5
64 x 2.0
42 x 1.5
64 x 2.0
number of cascaded water heaters
ΔT = 16.5 °C
1
2
54 x 1.5
-
54 x 1.5
64 x 2.0
. The definition of V
L
L
number of cascaded water heaters
ΔT = 16.5 °C
1
2
*
X
P1: 2 x 9 m
P1: 2 x 30 m
P1: 2 x 25 m
number of cascaded water heaters
ΔT = 16.5 °C
1
2
*
X
P2: 2 x 30 m
P1: 2 x 13 m
P1: 2 x 10 m
number of cascaded water heaters
ΔT = 16.5 °C
1
2
*
X
P2: 2 x 15 m
P2: 2 x 28 m
P2: 2 x 25 m
number of cascaded water heaters
ΔT = 16.5 °C
1
2
*
X
-
P2: 2 x 30 m
P2: 2 x 18 m
number of cascaded water heaters
ΔT = 12.5 °C
3
1
64 x 2.0
42 x 1.5
64 x 2.0
42 x 1.5
number of cascaded water heaters
ΔT = 12.5 °C
3
1
-
54 x 1.5
64 x 2.0
54 x 1.5
number of cascaded water heaters
ΔT = 12.5 °C
3
1
-
54 x 1.5
76 x 2.0
54 x 1.5
number of cascaded water heaters
ΔT = 12.5 °C
3
1
-
54 x 1.5
76 x 2.0
54 x 1.5
is shown in fig.1. From this distance, extra resistance in the
L
number of cascaded water heaters
ΔT = 12.5 °C
3
1
*
P2: 2 x 30 m
X
P2: 2 x 13 m
P1: 2 x 12 m
m
number of cascaded water heaters
ΔT = 12.5 °C
3
1
*
-
X
P2: 2 x 30 m
P2: 2 x 25 m
number of cascaded water heaters
ΔT = 12.5 °C
3
1
*
-
X
P2: 2 x 30 m
-
number of cascaded water heaters
ΔT = 12.5 °C
3
1
*
-
X
P2: 2 x 7 m
-
L.
E93.1804.014
2
3
54 x 1.5
-
54 x 1.5
76 x 2.0
2
3
64 x 2.0
-
64 x 2.0
76 x 2.0
2
3
76 x 2.0
-
76 x 2.0
88.9 x 2.0
2
3
-
-
76 x 2.0
88.9 x 2.0
2
3
-
-
P2: 2 x 9 m
-
2
3
-
-
P2: 2 x 9 m
-
2
3
-
-
-
-
2
3
-
-
-
-
35
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