Bell & Gossett MN 414 AC Submersible Pump Motors - Manual (Page 10)

2−4 Installation & Operation MN414
Moisture Protection
The submersible moisture protection system consists of the non−wicking cable cap assembly and the
dual moisture sensing probes. The cable cap assembly prevents moisture from wicking through the cable
assembly even when the cable jacket has been punctured.
Dual moisture sensing probes extend into the oil chamber located between the tandem mechanical seals.
Should the outer seal fail, water will enter the oil chamber through the labyrinth slinger paths and create a
water/oil emulsion in the oil chamber. The moisture detector control applies voltage to the moisture probes.
The presence of water in the oil chamber increases the conductivity sufficiently to increase current flow
through the probe circuit. A leakage detector control must be purchased separately from:
Ametek APT
S 1080 N. Crooks Road S Clawson, MI 48017-1097 USA S Voice 800-635-0289 (248-435-0700) S Fax 248-435-8120
The leakage detector control system must be connected for the warranty and the U/L listing to be valid.
For information on the relay, see http://www.ametekapt.com/ (look in Literature pull down for
Model 8040MD Moisture Detect). It’s shown in Figure 2-3.
Figure 2-3 Moisture Sensing Circuit
Motor
W1 W2
Moisture Sensors
AC Line
To
Alarm
330k
Model 8040MDXYZ
Ametek APT
800-635-0289
248-435-0700
www.ametekapt.com
IMPORTANT:
Failure to properly connect and use this leakage
detector system voids motor warranty.
Control Cable Lead Color
Black White Red Orange Green
P1 P2 W1 W2 Ground
Note: For all physical, electrical, price, warranty and other information about this product, please contact the manufacturer directly:
Ametek APT
S 1080 N. Crooks Road S Clawson, MI 48017-1097 USA www.ametekapt.com
S Voice 800-635-0289 (or 248-435-0700)
S Fax 248-435-8120