tekmar 654 Snow Melting Control Installation - Manual (Page 5)

5 of 44 © 2013 654_D - 06/13
Control Wiring
Snow / Ice Sensor
090 or 094
Slab
Brn
+
Mod tN4 Aux Ht R C
Bret
Out/
Com –
Blk Yel Blu Red Sup
No Power
Snow Sensor
095
Slab Sensor
072 or 073
Slab
Brn
+
Mod tN4 Aux Ht R C
Bret
Out/
Com –
Blk Yel Blu Red Sup
No Power
Snow
Sensor
095
The control requires an external transformer. A tekmar
Transformer 009 can supply up to 40 VA, and includes an
in-line fuse to protect the transformer and control. The total power capacity of the power supply should be
larger than the total load of all the devices connected to the
control. This total load must not exceed 100 VA.
Sizing the Transformer
Snow / Ice Sensor ------------------------------- ------------------------------- Snow and Slab Sensor -------------------------- --------------------------
Outdoor, Supply and Boiler Return Sensor ------ ------
Outdoor
Sensor
070
or
Boiler
Return
Sensor
082
Supply
Sensor
082
Slab
Brn
+
Mod tN4 Aux Ht R C
Bret
Out/
Com –
Blk Yel Blu Red Sup
No Power
Modulating Output and tN4 Communication ----- -----
Modulating Boiler
Mixing Valve or
Mixing Injection Pump
0-10 V (dc) Signal
tekmarNet ® 4
Communication
– +
tN4 C
Slab
Brn
+
Mod tN4 Aux Ht R C
Bret
Out/
Com –
Blk Yel Blu Red Sup
No Power
See Application Brochure 654_A for specific application wiring diagrams.