Viessmann Vitosol 200-T SP2A Technical Data Manual page 11

Vitosol 200-T, SP2A Technical Data
Flow Rate
SP2A collectors have minimum required flow rates (low-
flow mode), and maximum flow rates (high-flow mode).
The collectors must operate within this range, and the
designer must choose a flow rate based on the specific
parameters of the system.
Individual collector flow rates
Flow
2
Model 1.26 m (10 tube collector)
2
Model 1.51 m (12 tube collector)
2
Model 3.03 m (24 tube collector)
Recommended collector array flow rates
Flow
10 tube collector array (model 1.26 m
12 tube collector array (model 1.51 m
24 tube collector array (model 3.03 m
36 tube collector array*
48 tube collector array*
60 tube collector array*
72 tube collector array*
84 tube collector array*
96 tube collector array*
* Collector arrays are combinations of collector model 1.51 m
High-flow mode
High-flow mode results in low temperature spread across
the collectors, but may require bigger pump and pipe
sizes for large systems. High-flow mode is best suited for
small scale systems consisting of less than 50 tubes, and
should always be used for the 1.26 m
Medium and low-flow modes
Medium and low-flow modes result in smaller pipe and
pump sizes, but higher temperature spread across the
collectors. Low-flow and medium-flow modes should
be used for larger collector arrays consisting of greater
than 50 tubes, to avoid high friction losses and high fluid
velocities within the collector, and reduce the size of
supply and return piping requirements.
Use the charts below to determine the required flow rate,
based on the size of the collector or collector array.
High flow mode
USG/min (L/min)
0.55 (2.1)
0.6 (2.3)
0.86 (3.3)
High flow mode
USG/min (L/min)
2
) 0.55 (2.1)
2
) 0.6 (2.3)
2
) 0.86 (3.3)
1.46 (5.6)
1.72 (6.6)
2.32 (8.9)
2.58 (9.9)
--
--
2
Medium flow mode
USG/min (L/min)
NR
0.4 (1.5)
0.67 (2.5)
Medium flow mode
USG/min (L/min)
--
--
--
--
--
--
2.01 (7.5)
2.41 (9.0)
2.68 (10.0)
2.
and/or model 3.03 m
Design Information
2
balcony module.
Low flow mode
USG/min (L/min)
NR
NR
0.47 (1.78)
Low flow mode
USG/min (L/min)
--
--
--
--
--
--
--
--
1.9 (7.2)
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