McDonnell & Miller MM 286 Series 1575 Low Water Cut-Off - Manual (Page 5)

Connect wires between C o n t rol Box and P ro b e s
as fo l l ow s.
P ro b e s C o n t ro l
S h o rt e s t / B l u e S h o rt e s t / B l u e
M i d d l e / Ye l l ow M i d d l e / Ye l l ow
L o n g e s t / R e d L o n g e s t / R e d
Chamber Ground Chassis Ground
Wire connections at Probes (1/4" Ring Terminal) and
Control Panel (22-18 1/4" Female Spade) must be
made with connectors suitable for high temperature
(200˚C) service.
NOTE
5
IMPORTANT: Do not use Teflon ® tape or hardening type
thread sealant. Use of pipe dope or hi-temp boiler grease
is recommended.
Probes and Electrical Connections
• Each probe is made up of an electrode and a probe rod. Each
probe rod must be cut to an appropriate point of operation.
• A 9" rod will be positioned at the low water cut-off level.
Cut other rods for the pump operating probes to the desired
length.
• After cutting, secure the probe rod to the electrode and lock
the thread using the jamnut in the electrode sleeve. Insert the
probe into the chamber and tighten by hand. Then torque to
22-25 ft/lbs (30-34 N/m).
• Refer to and follow all local codes and standards.
• Secure the electrical enclosure to the chamber with gasket
between. Note that the electrical connection opening can be
orientated in any of 4 positions. Tighten screws to 30 - 35 in/lbs
(3.4-4.0 N/m).
• Probe wire and conduit connections should be made fo l l ow i n g
accepted electrical practices.
• Install electrical cover enclosure after making all connections
and after control has been tested for proper operation.
Tighten screws to 30 - 35 in/lbs (3.4-4.0 N/m).
Wire must be 18 AWG stranded with glass braided silicone jacket
(UL 3071) suitable for high temperature (200˚C) service.
NOTE
(Attach to an electrical enclosure / mounting screw)