Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information can
result in death, serious personal injury, property damage, or
damage to the equipment.
Keep this Manual for future reference.
IS-WR-PM2C
Instructions for Installing PM-2C
Snow & Ice Sensor Control
These instructions are intended to provide specific application information
for installing the PM-2C snow and ice sensor control with the ProMelt snow
melt products.
Please refer to the full instruction manual given with the product for further
installation, Caution, and operation instruction. The PM-2C is a multi-voltage, self
contained temperature, snow and ice sensor control. Each PM-2C can be set to
operate with either 120, 208, 240 or 277 VAC and can control up to 30 amps of
service to the load. The integrated snow sensor is heated to allow for snow, ice,
or freezing rain to melt, allowing proper detection of environmental conditions.
Installation
The PM-2C must be installed in a location that exposes the moisture grid to a clear
view of the sky and any precipitation. The unit should not be mounted directly
under eaves, overhangs, or other obstructions that can block precipitation from
reaching the moisture grid.
Do not install the sensor close to the ground, or any other location, that can cause
the sensor to be buried in snow.
Mount the PM-2C outdoors, away from furnace vents, dryer vents, and other
sources of heat. The PM-2C can be mounted to a free-standing conduit or by
using the mounting holes in each corner of the enclosure.
Do not drill holes in the enclosure.
Wire the controller in accordance to the provided schematics.
Setting Configuration
Before turning power on to the PM-2C sensor, it is important to set all
control modes and settings.
1.
Place the control in Standby/Reset with the switch mounted on the side before
making configuration switch changes. Remember to return it to Automatic
mode when finished.
DEL: The control will operate with a Delay Off time. If this function
is set to Off, the control will operate with a 2 minute delay to
prevent short-cycling of external components.
Recommended ON.
LTC: The control will operate in Low Temperature Cutoff mode,
preventing operation when Ambient Temperatures (AT) fall
below 5°F (-15°C).
Recommended ON (for systems with limited heat output).
LD: This Long Delay switch determines the time span of the Delay Off
drying cycle. Either 30-90 minutes (LD Off) or 2-6 hours (LD On).
Recommended OFF.
5. Set the precipitation SENSITIVITY to reduce nuisance triggering. MORE to
trigger immediately upon detection. LESS to trigger with up to 120 seconds
of detection. Recommended MORE to begin, then adjust as needed.
Power must be cycled for switch changes to take effect.
Manual Override Switch
An override switch is mounted on the side for testing and special
operational requirements. Placing the switch in the "Automatic" position will
allow the sensor to operate normally. "Manual On" will activate the control and
will stay activated for a maximum of 40 hours before returning to "Automatic"
mode. The "Stand-by/Reset" position will clear any current snow melt call or
delay activity.
If the Manual Override Switch is moved to Manual On for less than 2
seconds and then back to Automatic the sensor will execute one Delay-
Off cycle. This can be used to clear frost, hail, drifting snow, or other
conditions. Stand-by/Reset will clear this setting.
PM-2C provides integrated air and moisture detection within a rainproof and
ice-resistant enclosure.
INDICATOR
POWER
OFF
30 A 277V AC, 20 A 28V DC
AVERTISSEMENT: IL PEUT Y AVOIR UN CIRCUIT SECONDAIRE SOUS TENSION
CERTIFIED TO CAN/CSA STD C22.2 NO. 14
CONFORMS TO UL STD 508
100-277V AC 0.15 A 50/60 Hz
ENCLOSURE TYPE 3R
RAIN/SNOW SENSOR CONTROLLER
WARNING: THIS UNIT MAY BE SUPPLIED BY MORE THAN ONE BREAKER
CONTROL
INPUT
Intertek
3175102
CONTROL SWITCH
STANDBY/RESET
MANUAL ON
AUTOMATIC
ACTIVATED
ENGINEERING
DANGER
DS-2C
AUTOMATED
SYSTEMS
T
S
L
I
E
D
CM
US
C
Air Temperature Sensor
Wiring Access
Control Switch
Moisture Grid
1. THIS UNIT SHOULD BE INSTALLED ONLY BY QUALIFIED PERSONNEL!
2.
To prevent the risk of electric shock, disconnect all power from the control
and associated equipment before opening the front cover plate.
3. Do not drill holes through the electrical enclosure for mounting. Mount the
control to a free-standing conduit or via the pre-determined mounting holes.
4. Ensure front cover gasket is properly installed when replacing cover.
TRIG TEMP
DELAY OFF
2.
Set the Trigger Temperature by adjusting the
TRIG TEMP control for desired melting condi-
tions. Precipitation below this temperature
is assumed to be snow, above this is rain. Control
comes with the TRIG TEMP dial set to 39°F (4°C).
3.
Set the DELAY OFF time for 30 to 90 minutes (LD
Off) or 2 to 6 hours (LD On). The Delay function will
allow the snow melt system to run for the set time
frame after moisture is no longer detected (once
snowfall has stopped). This is to help prevent "black
ice" from forming.
4. Determine how the sensor operates by setting the toggles located at S1.
Snow: The control will operate when
precipitation is detected below the
Temp Adjust setting. Recommended ON.
Rain: The control will operate when precipitation
is detected above the Temp Adjust setting.
Required OFF.
IS-WR-PM2C 1446 EDP#81018841 © 2014 Watts Radiant
USA: Tel: (800) 276-2419 • Fax: (417) 864-8161 • WattsRadiant.com
Canada: Tel: (888) 208-8927 • Fax: (905) 332-7068 • Watts.ca
Latin America: Tel: (52) 81-1001-8600 • Fax: (52) 81-8000-7091 • WattsRadiant.com
A Watts Water Technologies Company
Recommended Switch Settings
Function Trigger LTC DEL RAIN SNOW LD Off LD On
Snow sensor w/o LTC TT>AT OFF OFF OFF ON 2 Min 2 Min
Snow sensor w/LTC TT>AT>15°F (9.5°C) ON OFF OFF ON 2 Min 2 Min
Snow controller w/o LTC TT>AT OFF ON OFF ON 30-90 Min 2-6 Hr
Snow controller w/LTC TT>AT>15°F (9.5°C) ON ON OFF ON 30-90 Min 2-6 Hr
Do Not set the Rain switch to "ON". Possible overheating of the snow melt cables
may result.
Specifications
Supply Voltage 100 - 277 VAC
Trigger Temperature Range (TT) 34°F to 44°F (1°C to 6.5°C)
Configuration Modes
Snow Only
Rain Only
Snow or Rain
Delay Settings (post melting)
30 to 90 minutes
2 to 6 hours
Low Temperature Cutoff (LTC)
Prevents system operation when Ambient Temperature (AT)
is below 5°F (-15°C)
Operation Modes
Automatic
Standby/Reset
Manual
TEMPERATURE ADJUST
DELAY OFF ADJUST
SENSITIVITY ADJUST
CONFIGURATION SWITCH
GRID JACK
CONTROL/MONITOR JACK
SWITCH JACK
LOAD
INPUT POWER
CDP-2
Deice On
Snow Sensor
Control/Display Panel
Standby
Automatic
Manual On
SYSTEMS
AUTOMATED
ENGINEERING
Indoor monitoring
and control of the PM
2C is available with
the optional PM DP
snow melt sensor
remote control.
For more information
see the PM DP sub-
mittal or installation
instructions.
Limited Warranty: Watts Radiant (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within
the warranty period, the Company will, at its option, replace or recondition the product without charge.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE
COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without
limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material,
damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance
or alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited
Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY
IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF
ORIGINAL SHIPMENT.
At least once every four months the PM 2C should be powered down and the sensor grid
be wiped clean with clear water. Heavy deposits left behind by evaporated water may be
removed by gently scrubbing with a non-metallic scouring pad.
Sensor Maintenance
Circuit Breaker Panel
120 / 208 /
240 / 277 VAC
Ground
L1
L2 / N
Ground Fault type breaker
PM-2C
Snow Control
Waterproof
Junction Box
Gr
Ground
Yel
L2 / N
Blu
Brn
Yel
L1
Gr
Wh
Wh
ProMelt
Mat/Cable
PM-2C ControlProMelt Display Panel
WARNING: This product contains chemicals known to the State of California to cause cancer
and birth defects or other reproductive harm. For more information: www.watts.com/prop65
