46
Terminals
No. in
dia-
gram
Function
Explanation
502XD5
1: 24 VDC
2: Contact NC
PE: Protective conductor
e-W
Temperature limiter, heat-
ing circuit 3
Open: Fault
502XD7
1: 24 VDC
2: Contact NC
PE: Protective conductor
u-W
Temperature limiter, heat-
ing circuit 4
Open: Fault
503XD1
1: 24 VDC
2: 0 VDC
3: NC
4: NO
PE: Protective conductor
q-Z
Contact humidistat, heating
circuit 1
Open: Fault
503XD3
1: 24 VDC
2: 0 VDC
3: NC
4: NO
PE: Protective conductor
w-Z
Contact humidistat, heating
circuit 2
Open: Fault
503XD5
1: 24 VDC
2: 0 VDC
3: NC
4: NO
PE: Protective conductor
e-Z
Contact humidistat, heating
circuit 3
Open: Fault
503XD7
1: 24 VDC
2: 0 VDC
3: NC
4: NO
PE: Protective conductor
u-Z
Contact humidistat, heating
circuit 4
Open: Fault
551XD1
1: R+
2: R–
6
Outside temperature sen-
sor
Pt1000
551XD3
1: R+
2: R–
tQ
Heating water buffer cylin-
der temperature sensor,
top
Pt1000
551XD5
1: R+
2: R–
tW
Heating water buffer cylin-
der temperature sensor,
bottom
Pt1000
551XD7
1: R+
2: R–
PE: Shield connection
uW
Flow temperature sensor
NC
Pt1000
552XD1
1: R+
2: R–
PE: Shield connection
iW
Coolant buffer cylinder tem-
perature sensor, top
Pt1000
552XD3
1: R+
2: R–
PE: Shield connection
iE
Coolant buffer cylinder tem-
perature sensor, bottom
Pt1000
Installation sequence
Electrical connections
(cont.)
5855865
Installation
Summary of Contents for BW 352.B027
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