Grundfos Medium UPM Series Data Booklet page 17

Medium UPM
Selection of control mode
The selection of the control mode depends on the
system type and the allocation of pressure losses
defined by the valve or consumer authority.
System type
Heating system with PWM control of the pump.
Solar system with PWM control of the pump.
System without PWM control of the pump (stand-alone).
Variable-flow system with relatively
high pressure losses inside heating
appliance and pipes (> 50 % of pump
head).
Variable-flow system with relatively
low pressure losses inside heating
appliance and pipes (< 50 % of pump
head).
Two-pipe systems with
thermostatic radiator valve with
low valve authority.
Primary pump.
Two-pipe systems with
thermostatic radiator valve with
high valve authority.
Floor heating system with
variable flow.
One-pipe system with variable
flow.
Primary pump.
Systems with low flow variation.
H > 2 m for noise reduction.
N
Long distribution pipes.
High pressure losses in system parts
with total flow.
Heat consumers with low pressure
losses.
Primary circuit with high pressure
losses.
≤ 2 m for noise reduction.
H
N
Former gravity systems.
Low pressure losses in system parts
with total flow.
Heat consumers with high pressure
losses.
System with thermostatic zone
valves.
System with thermostatic radiator
valves.
Primary circuit with low pressure
losses.
Systems with minimum flow ensured
by an automatic bypass valve.
Recommended control mode
PWM A profile
PWM C profile
Internally controlled
Proportional pressure / AUTO
ADAPT
proportional pressure
Constant Pressure / AUTO
ADAPT
Constant Pressure
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