User Guide

Installation and operating instructions Wilo-Stratos/-D/-Z 33
English
Control modes Δp-c, Δp-v and Δp-T:
Δp-c (fig. 8) Δp-v (fig. 7) Δp-T (fig. 9)
Operating
point on max.
speed curve
Draw a line from the operating point to the left.
Read set value Hs and set the pump in
accordance with this value.
The settings are to be
made by customer
service taking the
plant conditions into
account, via the serial
digital interface or
using an IR operating
and service unit
(accessory).
Operating
point in
control range
Draw a line from the
operating point to the
left. Read set point Hs
and set the pump in
accordance with this
value.
Continue the standard
line until it meets the
max. speed curve,
then continue
horizontally to the
left, read set point Hs
and set the pump in
accordance with this
value.
Setting range H
min
, H
max
see type key (chapter 5.1) T
min
: 68…212°F
(+20...+100°C)
T
max
: 86…230°F
(+30...+110°C)
ΔT = T
max
-T
min
≥
50°F (10°C)
Increase:
ΔHS/ΔT ≤ 3.3 ft/50°F
(10°C) H
min
, H
max