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8.3 Selecting the control mode
System type
Heating/ventilation/air-
conditioning systems with
resistance in the transfer
section (room radiator +
thermostatic valve) 25%
of the total resistance
Drinking water circulation
systems with resistance in
the generator circuit 50%
of the resistance in the
ascending section
Heating/ventilation/air-
conditioning systems with
resistance in the generator/
distribution circuit 25%
of the resistance in the
transfer section (room
radiator + thermostatic
valve)
Installation and operating instructions Wilo-Stratos/-D/-Z/-ZD
System conditions
1. Two-pipe system with thermostatic/
zone valves and virtually no user
authority
• H
> 4 m
N
• Very long distribution lines
• Strongly throttled shut-off valves
for pipe sections
• Sectional differential pressure
control
• High pressure loss in system parts
through which total volume flows
(boiler/refrigerating machine, any
heat exchanger, distribution line up
to 1st branch)
2. Primary circuits with high pressure
loss
3. Drinking water circulation systems
with thermostatically controlled line
shut-off valves
1. Two-pipe system with thermostatic/
zone valves and high user authority
• H
2 m
N
• Converted gravity heating systems
• Conversion to large temperature
spread (e.g. district heating)
• Low pressure loss in system parts,
through which total volume flows
(boiler/cooling machine, any heat
exchanger, distribution line up to
1st branch)
2. Primary circuits with minor pressure
loss
3. Floor heating systems with thermo-
static or zone valves
4. One-pipe systems with thermostatic
valves or shut-off valves for pipe
sections
Recommended
control mode
p-v
p-c
English
81
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