Wilo Yonos MAXO User Manual

en
28 Installation and operating instructions • Wilo-Yonos MAXO/-D/-Z • Ed.01/2022-08
Control mode Description
Constant differential pressure
Δp-c
The control keeps the differential pressure created by the pump constant
above the permitted flow rate at the selected differential pressure setpoint
H
setpoint
up to the maximum characteristic curve.
Control mode selection during heating operation
System type System conditions Recommended
control mode
Heating/ventilation/air-condi-
tioning with resistor in transfer
section (space heater and ther-
mostatic valve) ≤25% of the
total resistance
• Dual-pipe systems with thermostat/zone valves
and low valve authority:
– HN >4m
– Very long outlet pipes
– Heavily throttled line shut-off valves
– Line differential pressure controller
– High pressure losses in those system sections
that are flowed through by the total volume
flow (boiler, refrigerating machine, potentially
heat exchanger, distribution pipes to the first
junction)
• Primary circuits with high pressure losses
Δp-v
Heating/ventilation/air-condi-
tioning
• Constant volume flow
• Hot water priority (c3)
• Manual night setback via speed stage alignment
(c1)
Constant speed
(c1, c2, c3)
Heating/ventilation/air-condi-
tioning with resistance in the
generator/distributor circuit
≤25% of the total resistance
in transfer section (room radia-
tor and thermostatic valve)
• Dual-pipe systems with thermostat/zone valves
and high valve authority:
– HN ≤2m
– Converted gravity system
– Conversion to large temperature storage (e.g.
district heating)
– Low pressure losses in those system sections
that are flowed through by the total volume
flow (boiler, refrigerating machine, potentially
heat exchanger, distribution pipes to the first
junction)
• Primary circuits with minor pressure losses
• Underfloor heating with thermostat and zone
valves
• One-pipe system with thermostat and line shut-
off valves
Δp-c
Control mode selection during drinking water operation
System type System conditions Recommended
control mode
Domestic hot water circulation
systems
Domestic hot water circulation systems with thermo-
statically controlled line shut-off valves
Δp-v
Domestic hot water circulation
systems
Constant volume flow
Constant speed
(c1, c2, c3)

Wilo Yonos MAXO Specifications

General

Model	Yonos MAXO
Category	Water Pump
Protection Class	IPX4D
Max. Operating Pressure	10 bar
Frequency	50/60 Hz
Temperature Range	-20°C to +110°C
Energy Efficiency Index (EEI)	≤ 0.23
Application	Heating, cooling, and solar systems
Operating Modes	Constant pressure
Motor Protection	Integrated
Materials	Cast iron, stainless steel
Voltage	230 V
Ambient Temperature	Up to +40°C
Connection Size	DN 25
Power Supply	1~230 V, 3~400 V (depending on the model)