BMC and
INSTALL THE SENSORS
HEATING SYSTEM SENSOR (HSS) INSTALLATION
LOCATING HSS• Put the Heating System sensor approximately 10' feet past the last boiler on |
the common supply header but before any major takeoffs. |
Immersion Heating System Sensor
Immersion Well |
| Common Supply Pipe |
3/8" ID 1/2" NPT |
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Shield
Heating System
• The sensor must be located where it sees the output of all the boiler stages. If |
a boiler is piped so that the sensor does not see its output, the BMC will not |
Sensor
Sensor Probe
sequence the boilers correctly. |
• Only use a Standard Brass Tube sensor |
• The sensor wires can be extended up to 500' using a shielded |
cable (Belden #8760 or equivalent). Do not ground the shield at the sensor |
but at the panel using one of the terminals marked with an “O”. |
• Do not run sensor wires in conduit with line voltage wiring. |
Common Supply Pipe | Pipe Insulation |
•Install a 3/8"ID 1/2"NPT immersion well
•Insert the sensor probe of the supplied sensor into the well.
•Strap the sensor to the pipe using metal clamps. Do not over tighten the clamp.
•Strap pipe insulation around the sensor and pipe.
Shield
Sensor Probe
ALERT
If the HSS can not sense the correct heating system water temperature being supplied to the building, the BMC will not provide comfortable heat levels. Be sure the HSS is located on a main supply pipe which can not easily be isolated from the system.
OUTDOOR SENSOR INSTALLATION
• | Only use the Weil McLain sensor included with the unit |
• | Locate the sensor in the shade on the north side of the building. The sensor |
Outdoor Sensor
| should never be in direct sunlight. |
• | Be sure the location is away from doors, windows, exhaust fans, vents, or |
| other possible heat sources. |
• | The sensor should be mounted approximately 10' feet above ground level. |
• | Adhere the Outdoor Label provided to the back of the sensor base. |
• | Use the Enclosure Base bottom knockout for the conduit. Use the locknut to |
| hold the conduit and enclosure base together. Screw the cover to the base. |
• | If screws are used to affix the enclosure to the wall, make sure to seal around |
| the sensor and wall except from the bottom. |
• | The sensor wires can be extended up to 500' using shielded |
| (#18/2). Do not ground the shield at the sensor but at the control using the |
| terminal marked with an “O”. |
• | Do not run sensor wires in conduit with line voltage wiring. |
WARNING
The BMC is an operating control only. All boilers must have all safety and limit controls required by code. It is the responsibility of the installer to verify that all the safety and limits are working properly before the BMC is installed.
Seal around sensor and wall
Mounting
screws location
Outdoor
Outdoor
Sensor
Shield
not connected
Outdoor Label on back of Sensor
Conduit
ALERT
Determining the proper location for the Outdoor Sensor is very important. The BMC will base the heat on the outdoor temperature information it receives from this location. If the sensor is in the sun, or covered with ice, its reading will be different from the actual Outdoor temperature (OD).
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