Grundfos UPM3 User Manual

7.11 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 Recommended control mode
Heating system with PWM control of the pump
PWM A profile
Solar system with PWM control of the pump
PWM C profile
System without PWM control of the pump (stand-alone) Internally controlled
Variable-flow system with relatively
high pressure losses inside heating
appliance and pipes (> 50 % of pump
head)
Two-pipe systems
with thermostatic radi-
ator valve with low
valve authority
H
N
> 2 m for noise
reduction
Proportional pressure / AUTO
ADAPT
proportional pressure
Long distribution
pipes
High pressure los-
ses in system parts
with total flow
Heat consumers
with low pressure
losses
Primary pump
Primary circuit with
high pressure los-
ses
Variable-flow system with relatively
low pressure losses inside heating
appliance and pipes (< 50 % of pump
head)
Two-pipe systems
with thermostatic radi-
ator valve with high
valve authority
H
N
≤ 2 m for noise
reduction
Constant pressure / AUTO
ADAPT
Constant pressure
Former gravity sys-
tems
Low pressure los-
ses in system parts
with total flow
Heat consumers
with high pressure
losses
Floor heating system
with variable flow
System with ther-
mostatic zone
valves
One-pipe system with
variable flow
System with ther-
mostatic radiator
valves
Primary pump
Primary circuit with
low pressure los-
ses
Systems with low flow
variation
Systems with mini-
mum flow ensured
by an automatic by-
pass valve
Constant flow systems
Constant curve
8. External control mode and signals
8.1 Control principles
The UPM3 and UPM3 FLEX pumps are controlled via a digital low-
voltage pulse-width modulation (PWM) signal, which means that the
speed of rotation depends on the input signal.
UPM3 HYBRID pumps can be set to be controlled either internally
or externally. The speed changes as a function of the input profile.
These communication signals are standardised in the VDMA
Einheitsblatt 24244 "Wet runner circulating pumps - Specification of
PWM control signals".
15
English (GB)

Grundfos UPM3 Specifications

General

Brand	Grundfos
Model	UPM3
Category	Water Pump
Language	English