Control Mode Selection; Setting The Pump Output - Wilo Yonos PARA High Flow Série Notice De Montage Et De Mise En Service

8.2.2 Control mode selection

System type
Heating/ventilation/air-condi-
tioning systems with resistance
in the transfer section (room
radiator + thermostatic valve)
≤ 25% of the total resistance
Heating/ventilation/air-condi-
tioning systems with resistance
in the generator/distribution
circuit ≤ 25% of the resistance
in the transfer section (room
radiator + thermostatic valve)
Heating/ventilation/air-condi-
tioning systems

8.2.3 Setting the pump output

During planning, the unit is designed for a specific duty point (hydraulic full-load point for
maximum heating power requirement calculated). During commissioning, the pump out-
put (delivery head) is set according to the duty point of the system.
In systems requiring hot water priority, the pump can be set to the maximum fixed speed
stage (3).
If the system only requires a low volume flow, the pump can be set to the minimum fixed
speed stage (1). This is practical for manual setback operation, for example.
NOTE: The factory setting does not comply with the pump capacity required for the sys-
tem. It is determined with the help of the pump curve diagram for the selected pump type
(from catalogue/data sheet). See also Figs. 8 and 9.
Installation and operating instructions Wilo-Yonos PARA High Flow
System conditions
1. Two-pipe systems with thermostatic/
zone valves and low valve authority
• H > 4 m
N
• Very long distribution lines
• Strongly throttled shut-off valves for pipe
sections
• Sectional differential pressure control
• High pressure losses in the system parts
through which the entire volume flows
(boiler/refrigerating machine, heat
exchanger possibly, distribution pipeline
up to the first branch)
2. Primary circuits with high pressure losses
1. Two-pipe systems with thermostatic/
zone valves and high valve authority
• H ≤ 2 m
N
• Converted gravity heating systems
• Conversion to large temperature spread
(e.g. district heating)
• High pressure losses in the system parts
through which the entire volume flows
(boiler/refrigerating machine, heat
exchanger possibly, distribution pipeline
up to the first branch)
2. Primary circuits with low pressure losses
3. Floor heating systems with thermostatic
or zone valves
4. One-pipe systems with thermostatic or
line shutoff valves
Constant volume flow
Manual setback operation via speed stage setting
Recommended
control mode
Δp-v
Δp-c
n = const.
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