Replacing The Heat Meter - Danfoss HDU-SF Service Manual

Service Guide
Combined function module
The combined module is equipped with 2 inputs and 1 output.
The pulse input specification is the same as that of the pulse input module
above.
The pulse output specification is the same as pulse output module above,
but not electrically isolated.
Analogue output function module
The module contains connections for 2 passive analogue outputs, which
can be programmed as desired using the IZAR@SET software. The outputs
are marked on the terminal strip as "1" and "2" with the respective polarity
"+" and "–". When connecting to outputs, one should observe polarity.
▪ Passive analog output
▪ External power supply: 10...30 V DC
▪ Current loop 4 ... 20 mA
▪ Errors are generated at 3.5 mA or 22.6 mA (programmable)
▪ Output values: power, flow rate, temperatures
Test output
This test output located on the side is intended for use by test centres. The manufacturer provides two special cables for this: 1. Volume
test pulses and 2. Energy test pulses. Other specifications (pulse value, pulse duration/break, pulse frequency) can be obtained from
the Inspection and Test Instruction.
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Replacing the Heat Meter

Ordering a new Heat Meter
A new Heat Meter can be ordered at Danfoss by using the informations on
the existing Heat Meter:
1. Product name
2. Ordering number
3. Production year
Removing the existing Heat Meter
1. Close both shut-off valves.
2. Manually close all ports on the return manifold with a 5 mm Allen key.
3. Loosen the Allen screw and pull out the temperature sensor from the
manifold pocket.
4. Remove the Heat Meter electronic by sliding it off the bracket.
5. Remove the brass part from the return flow (remember backstop to
prevent the shut-off valves from loosening).
Danfoss Heating Solutions
HDU-SF (Horizontal Distribution Units - Single Flat)
VIIGB102
Heat meter Heat meter
SONOMETER™1100
Made in Germany Made in Germany
V V
Δ Δ ΔT ΔT ΔT Δ Δ ΔT T
GPM GPM
-V -V
3030716 3030716
087G6103 087G6103 087G6103
Installation: high temp. Installation: high temp.
S/N: 41598383 S/N: 41598383
qs: 5m qs: 5m 3 3 /h /h Θ: 1....180°C Θ: 1....180°C
qp: 2.5m qp: 2.5m 3 3 /h /h ΔΘ: 3...177K ΔΘ: 3...177K
qi: 0.025m qi: 0.025m 3 3 /h /h Pt 500 Pt 500
PS/PN: 16 PS/PN: 16 class 2 class 2
DN20 DN20 IP54 IP54 E1 / M1 E1 / M1
Θq: 5...130°C Θq: 5...130°C P.-Year 2012 P.-Year 2012 P.-Year 2012
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