19
Table 7
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1 description of power terminals71
220V AC power supply mode
24V DC power supply mode
Terminal symbols
meaning
Terminal symbols
meaning
L
220V AC L
+
24V DC +
N
220V AC N
-
24V DC -
Table 7
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2 description of flow sensor terminals72
Terminal symbols
meaning
A
EMF signal input
C
Common end of electromotive force signal
B
EMF signal input
X
Excitation current output
Y
Table 7
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3 description of output terminals73
Terminal symbols
meaning
I+
Current output positive
Ⅰ
Output public
P+
Frequency output positive
S
485 communication ground
R+
485 communication positive
R-
485 communication negative
Table 7
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4 temperature sensor terminal description74
Four wire terminal
Two wire terminal
Terminal
symbols
meaning
Terminal
symbols
meaning
TS
Water supply end
temperature sensor
TS
Water supply end
temperature sensor
Tr
Temperature sensor
at return end
Tr
Temperature sensor at
return end
Four wire system to two-wire system: short circuit ts+ and ts+, ts- and ts-, and connect
ts+ and ts-; Short circuit tr+ and tr+, tr- and tr-, and connect tr+ and tr-.