Operation
Once all wiring connections have been completed, the sensor and ProMelt
mats/cables have been fully installed, and any inspections made as
required per local code, energize the circuit breaker(s) supplying the panel.
Automatic Operation
This is the recommended mode of operation. The sensor will activate
the panel, energize the connected ProMelt mats/cables indicated by the
"Heating On" light on the front of the panel.
Manual Operation
This mode may be used to briefly test the system or temporarily
override the sensor control to complete melting or drying of a snow
melted area. If this is required often to help complete the snow melting
of an area, it is recommended to adjust the sensor control or consult your
system designers for possible improved automatic sensing and control.
Turn the Timer to the desired time. This overrides the sensor and
activates the panel, energizing the connected ProMelt mats/cables,
shown by the "Heating On" light.
Do not manually energize the ProMelt mats/cables with outdoor
temperatures above 68°F (20ºC) except for a brief test up to 10
minutes in duration. Damage to the mats/cables or slab/surface
materials may result.
CP series of controls can be used directly with any ProMelt cable or mat system. Power is connected directly to each contactor in the control.
Each ProMelt system can be used with a wide variety of moisture/precipitation sensors, including the following:
– Slab Mounted: PM-HSC5
– Pole Mounted: PM-224 and PM-824
Each sensor option is designed to operate a single system. Use a dedicated sensor and CP Control group for each snow melt zone.
277 VAC
Circuit
Breaker
Panel
Installation Notes:
CABLE TO SENSOR
Class 2 control circuit.
Use 4-conductor shielded, outdoor
rated wire.
See sensor manual for minimum wire
gauge and maximum wire lengths.
120 VAC
Control
Circuit
Branch circuit protection provided by
installer. Maximum 70A GFEP type.
N
L
N
L
N
L
CP
Contactor
Panel
120 / 208 / 240 VAC
Circuit
Breaker
Panel
N / L1 L2
L1 L2
T2
T1
L2
L1 L2
T2
T1
24
VA
C
Co
m
m
on
PM
CP
Contactor
Panel
C1
C4
BLU BRN YEL
YEL
PM-224
or PM-824
Sensor
Junction
Box
GRN
120
COM
N / L1
208
240
120
COM
208
240
PM-HSC5
Sensor
ProMelt
Transformer Notes:
Connect primary to quick-connect
terminals L1 and L2 on contactor C1.
CAUTION: Ensure voltage lead
matches supply voltage to C1.
Improper connection may cause
damage.
Branch circuit protection provided by
installer. Maximum 70A GFEP type.
L1 L2
(Optional)
CP Contactor Panel used as an
"extension" panel
X1
X2
24
VA
C
Co
m
m
on
PM
X1
X2
To optional
additional
CP-Series
panels
rev 071712 Watts Radiant (800) 276-2419
WIRING
Wire per NEC or CEC and local codes.
Circuit size 125% of load.
Field wiring: Use Copper Conductors
Only, 75C, 20 lb-in (2.3 Nm)
RED BLK ORG
BLU
24
VA
C
Co
m
m
on
PM
X1
X2
T2
T1
L1 L2
T2
T1
C1
C4
Same connections as 120 / 208 / 240 VAC
X1 & X2 are dry contact, N.O.
24
VA
C
24
VA
C
C
O
M
M
O
N
C
O
M
M
O
N
P
M
P
M
X1
X2
Terminal Block Wire Insertion Detail
