Selection Of Control Mode - Wilo Stratos PARA Série Notice De Montage Et De Mise En Service

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8.3 Selection of control mode

System type
Heating/ventilation/
air-conditioning with
resistance in delivery
part (space heater +
thermostat valve)
≤ 25% of total resist-
ance
Heating/ventilation/
air-conditioning with
resistance in genera-
tor/distribution cir-
cuit≤25% of
resistance in delivery
part (space heater +
thermostat valve)
Tab. 5
24
System conditions
1. Twin pipe system with thermostat/zone
valves and virtually no user authority
• H > 4 m
N
• Very long distribution lines
• Strongly throttled stop valves for pipe sec-
tions
• Sectional differential pressure control
• High pressure loss in system parts, through
which total volume flows (boiler/cooling
machine, poss. safe heat exchanger, distri-
bution line up to 1st branch)
2. Primary circuits with high pressure loss
1. Twin pipe system with thermostat/zone
valves and high user authority
• HN ≤ 2 m
• Reconstructed thermosiphon circulation
systems
• Retrofitting to large temperature differ-
ences (e.g. district heat)
• Low pressure loss in system parts, through
which total volume flows (boiler/cooling
machine, poss. safe heat exchanger, distri-
bution line up to 1st branch)
2. Primary circuits with little pressure loss
3. Underfloor heating with thermostat or
zone valves
4. Single pipe systems with thermostat or
stop valves for pipe sections
Recommended
control mode
∆p-v
∆p-c
WILO AG 09/2006