ASE PM-2B Instruction Manual

IS-PM2B
Instructions for Installing PM-2B
Remote snow/ice sensor
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.
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.
Operation
Before installing and wiring the PM-2B sensor, it is important to set all
power and control settings prior to wiring or mounting.
1. Set the voltage jumpers
to correspond with the
supplied power. Place
jumpers on the outside two
posts for 120 VAC and a
single jumper on the inside
two posts for 240 VAC.
2. Set the Temp Adjust
control for desired melting
conditions. Precipitation below this temperature
is assumed to be snow, above rain. Control comes
with the Temp Adjust dial set to 39°F.
3. Set the Delay (DEL) time for 30, 45, 60, 75, or 90
minutes. The Delay function will allow the snowmelt
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: On – the control will operate when
precipitation is detected below the
Temp Adjust setting. Recommended ON.
Rain: On – the control will operate when precipitation is detected
above the Temp Adjust setting. Required OFF.
DEL: On – 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: On – the control will operate in Low Temperature Cutoff mode,
preventing operation when Ambient Temperatures (AT) fall
below 15°F. Recommended ON.
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
snowmelt 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.
IND. CONT. EQ.
LISTED
11TN
USC R
ENCLOSURE TYPE 3R

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

PM-2B provides integrated air and moisture detection within a
rainproof and ice-resistant enclosure.
Air Temperature Sensor
Wiring Access
Control Switch
Moisture Grid
!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.
Manual
On
30Min
45
60
75
90
Manual
On
30Min
45
60
75
90
Manual
On
30Min
45
60
75
90
Manual
On
30Min
45
60
75
90
Manual
On
30Min
45
60
75
90

IS-PM2B Effective Date: 0915-1 EDP# 81012452 © Watts, 2009
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.
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
Slab
Maximum 30A Heating Load
120/208/240VAC
1 circuit
Pole-mount sense
PM-2B
Junction
Box
Circuit Breaker Panel
Junction
Box
Ground
120 / 208 / 240 VAC
Maximum 40A breaker
Gr
Ground
Yel
L2 / N
Wh
Blk
Yel
L1
Gr
Wh Wh
L1
L2 / N
CONFIGURATION SWITCH
CONTROL/MONITOR JACK
SWITCH JACK
VOLTAGE SELECT
INPUT POWER
LOAD
GRID JACK
PROBE JACK
TEMP ADJUST
DELAY ADJUST
Recommended Switch Settings
Function Trigger Delay LTC DEL RAIN SNOW
Snow sensor w/o LTC TT>AT 2 min OFF OFF OFF ON
Snow sensor w/LTC TT>AT>15°F 2 min ON OFF OFF ON
Snow controller w/o LTC TT>AT 30-90 min OFF ON OFF ON
Snow controller w/LTC TT>AT>15°F 30-90 min ON ON OFF ON
Do Not set the Rain switch to "ON". Possible overheating of the snowmelt cables
may result.