18 of 20
Brn
Slab
Blk
Com
Yel
Blu
Red
OR
Zone
Circulator
Primary
Circulator
Optional Snow
Sensor 095
Snow/Ice
Sensor 090
Optional Slab
Sensor 072
Boiler Sensor
Outdoor
Sensor 070
Modulating
Boiler
Mod
Stage 1
T
T
+
-
20
19
WiFi Snow Melting Control 670
Boiler & Mixing / Electric
Date Code
H2055A
1 kΩ max
1 kΩ max
Opn
3
Var
2
–
Mix V/mA
1
+
Pwr
4
Mix
Cls
5
Blu
8
Yel
9
Brn/
10
Slab
Man
11
Melt
C
12
Blk/
7
Com
Red
6
Boiler 1
ModBoiler
21
Stage 1
Boiler 1
Stage 2
Heat
Relay
System
Pump
–
22
+
23 24 25
Do Not Apply Power
Mix
15
Sup
Com
16
Boil
17
Out
18
Com
14
tN4
13
28
27
26
Power
29
L
30
N
Snow
Sensor
095
Field Wired
Appendix - Control Wiring