elco Combi 24 User Manual

16
Installation
Hydraulics
Circulation pumps
Pump modulation
A number of functions are available for
the modulating boiler pump.
• None(Functionisswitched-o󰀨)
• Demand (Do not use this function)
• Boiler setpoint (Do not use this
function)
• Tempdi󰀨erentialnominal
• Burner output (Do not use this
function)
Temp di󰀨erential nominal
The LMS continues to control the
boiler’s output such that the boiler
temperature setpoint is maintained.
Pump speed control controls the boiler
pump’s speed in a way that the
parameterized nominal temperature
di󰀨erentialofboilerreturnandboiler
owismaintained.
Ifthee󰀨ectivedi󰀨erentialisgreater
thanthenominaldi󰀨erential,the
pump’s speed is increased, otherwise it
is decreased.
The pump’s speed is limited by the
parameterized minimum and maximum
speed.
Recommended settings:
Radiators 20K
Underoorheating 10K
Mixed systems 10K
System separation (LV 20K
header/Plate heat exchanger)
GRUNDFOS UPM3 25-70
Boiler type
Circulating water volume (T=20K) Residual head Energy consumption
l/min l/u mbar kPa PWM (%) Pmax pump
[W]
EEI
13 9,5 570 200 20 45 15 < 0,20
19 13,0 781 200 20 55 25 < 0,20
24 15,8 950 200 20 60 28 < 0,20
34 24,1 1444 200 20 75 55 < 0,20
35L* 24,6 1473 200 20 55 25 < 0,20
46* 32,3 1938 200 20 70 49 < 0,20
54* 38,0 2279 200 20 90 60 < 0,20
Combi 24 15,8 950 200 20 60 28 < 0,20
Combi 34 24,1 1444 200 20 80 57 < 0,20
* Note:
This boiler has to be connected to a
low velocity header and secondary
circuit pump.
Line no. Selection possibilities Factory setting
2317 Tempdi󰀨erentialnominal 20
1)
2320 Pump modulation Tempdi󰀨erentialnominal
2)
2321 Starting speed 100
2322 Pump speed min 45
2323 Pump speed max THI S PLUS 13: 45
THI S PLUS 19: 55
THI S PLUS 24 / Combi 24: 60
THI S PLUS 34 / Combi 34: 75
THI S PLUS 35L: 55
THI S PLUS 46: 70
THI S PLUS 54: 90
1)
Adjust value to hydraulic system
2)
Do not adjust this value
Minimum speed of the boiler pump
Values less than 45% only set in case
ofownoisesduringcommissioning.
In this case read new residual head
from chart and adjust the bypass
accordingly.
The use of a low velocity header or
plate heat exchangers can be set up to
min. 25% (OEM limitation).
Note:
Too low pump speeds can lead to
unfavorable temperature conditions
during ignition load and may result in
error messages.

elco Combi 24 Specifications

General

Brand	elco
Model	Combi 24
Category	Boiler
Language	English