Owner's Manual
Remote snow/ice detector
The PM-2B is a multi-voltage, self contained snow and ice detector. Each
PM-2B can be set to operate with either 120 , 208, or 240 VAC and can
provide 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.
Specifications
Supply Voltage
100 - 120 VAC
200 - 240 VAC
Trigger Temperature Range (TT) 34°F to 44°F
Configuration Modes
Snow Only
Rain Only
Snow or Rain
Delay Settings (post melting) 30 to 90 minutes
Low Temperature Cutoff (LTC)
Prevents system operation
when Ambient Temperature
(AT) is below 15°F
Operation Modes
Automatic
Standby/Reset
Manual
Installation
The PM-2B 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-2B outdoors, away from furnace vents, dryer vents, and
other sources of heat. The PM-2B 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.
Standards and Listings
For Snowmelt Applications
ES: PM2B
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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PM-2B Sensor/Controller
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials
without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
IND. CONT. EQ.
LISTED
11TN
USC
R
ENCLOSURE TYPE 3R
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WARNING: General Safety Instructions
1. THIS UNIT SHOULD BE INSTALLED ONLY BY
QUALIFIED PERSONNEL!
2. Disconnect all power from the control, or any associated equipment,
before opening the front cover plate.
3. Confirm power selection jumpers are properly set prior to
applying power.
4. To avoid fire hazard, replace fuse only with 1/2 Amp 250 VAC 2AG fast
acting fuse.
5. 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.
6. Ensure front cover gasket is properly installed when replacing cover.
PM-2B provides integrated air and moisture detection within a
rainproof and ice-resistant enclosure.
Air Temperature Sensor
Wiring Access
Control Switch
Moisture Grid
Product Options
Description Order #
PM-2B Sensor/Control 81011699