ASE PM-2B Instructions For Installing

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.
30Min
Snow:
On – the control will operate when
precipitation is detected below the
Manual
On
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.
45
30Min
60
75
90
Manual
On
45
30Min
60
75
90
Manual
On
45
60
75
90
PM-2B provides integrated air and moisture detection within a
rainproof and ice-resistant enclosure.
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.
45
30Min
60
75
45
30Min
60
90
Manual
75
On
90
!
Manual
On
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.
Moisture Grid
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Wiring Access
Air Temperature Sensor
WARNING: General Safety Instructions
IS-PM2B
Control Switch