Selecting The Control Mode; Adjusting The Pump Output - Wilo Yonos ECO BMS Notice De Montage Et De Mise En Service

8.2

Selecting the control mode

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)
8.3

Adjusting 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. The factory setting
does not correspond to the output required for the system. It is determined with the help
of the pump curve diagram for the selected pump type (from catalogue/data sheet). See
also Figs. 5 and 6.
Control modes ∆p-c and ∆p-v:
Duty point on max -
imum pump curve
Duty point within
the control range
Setting range
Installation and operating instructions Wilo-Yonos ECO BMS
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 line stop valves
• Sectional differential pressure control
• High pressure loss in system parts through
which total volume flows (boiler/refriger -
ating machine, any heat exchanger, distri -
bution line up to 1st branch)
2. Primary circuits with high pressure loss
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/refriger -
ating machine, any heat exchanger, distri -
bution line up to 1st branch)
2. Primary circuits with minor pressure loss
3. Underfloor heating systems with thermo -
static or zone valves
4. One-pipe systems with thermostatic valves
or line stop valves
∆p-c (Fig. 6)
Starting at the duty point, draw towards the left. Read off setpoint H
the pump to this value.
Starting at the duty point, draw
towards the left. Read off setpoint H
and set the pump to this value.
H , H , see 5.1 Type key
min max
∆p-v (Fig. 5)
Move to max. pump curve along con -
trol curve, then horizontally to the
S
left, read off setpoint H
pump to this value.
English
Recommended
control mode
∆p-v
∆p-c
and set
S
and set the
S
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