Strebel S-WG 100, Installation, Operating And Maintenance Manual, Page: 54 / 125

E09.012.246 Manual S-WG
55
9.6.2
T
WO
S-WG100
WATER HEATERS WITH TWO
450-
LITRES TANKS
Water heater connections, assigning codes:
For this system rule 2 must be applied.
Number the water heaters: water heater-1 is the water heater furthest from the tank(s), see picture.
Number de connection pipes directly connected to the water heaters: F1 en R1, see picture.
Number de horizontal connection pipes:
-
flow pipes starting at water heater-1: F1 t/m FF (here only an F1 and an FF), see picture.
- return pipes starting at water heater-last (= water heater-2): R1 t/m RR (same remark), see picture.
Pipe sizes, water heater side:
From table WH-100 , 2
nd
row:
- All pipes F1 and R1 in the picture must measure at least 54

1,5 [mm

mm] (column F1/R1)
- The pipes FF and RR must measure 67

1.9 [mm

mm] (column FF/RR).
Tank connections:
From table T-100 , 2
nd
row: for 2 tanks A1 = B1 = 54

1.5 [mm

mm] is sufficient.
So for this system pipes sized at least 54

1.5 [mm

mm] are to be applied for all connections directly on water
heaters and tanks, and pipes sized at least 67

1.9 [mm

mm] for the flow and return connections between
them.
Equivalent length:
From table EL :
The maximum total length of flow and return pipes 67

1.9 [mm

mm] is 26.1 m.
So when 67

1.9 [mm

mm] is applied, the physical distance between water heaters and tanks may be half of
this, so ~ 13 m, at max. In case bends and/or valves are used, this distance becomes less than 13 m. Use the
table.
2 boilers
S-WG100
2 tanks
450 L
F1 R1 F1 R1
R1
FF F1
RR
RR
1 2
FF
B1 A1 B1 A1
RR
FF
KOUD IN
1 2
Example 2
COLD IN