User Guide

Copyright 2010, Schneider Electric
All brand names, trademarks and registered
trademarks are the property of their respective
owners. Information contained within this
document is subject to change without notice.
F-27087-6
www.schneider-electric.com/buildings
Schneider Electric
1354 Clifford Avenue
P.O. Box 2940
Loves Park, IL 61132-2940
On October 1st, 2009, TAC became the Buildings business of its parent company Schneider Electric. This document reflects the visual identity of Schneider Electric,
however there remains references to TAC as a corporate brand in the body copy. As each document is updated, the body copy will be changed to reflect appropriate
corporate brand changes.
CHECKOUT 1. Checkout valve/actuator assembly operations:
a. Power the actuator and run the valve full stroke. The valve stem should operate
smoothly. At the closed position, the valve should shut off tightly.
b. For spring return actuators, allow the actuator to spring return to the normal position.
Again, the valve stem should operate smoothly.
2. With the piping under pressure, check the valve body and the connections for leaks.
MAINTENANCE The ball valve assembly itself requires no maintenance. The stem and packing design eliminates
the need for packing adjustment for the life of the valve. However, regular maintenance of the
total heating and cooling system is recommended to assure sustained optimum performance.
Water System
Maintenance
All heating and cooling systems are susceptible to valve and system problems caused by
improper water treatment and system storage procedures.
The following guidelines are to help avoid valve and water system problems resulting from
improperly treated water or storage procedures, and to obtain maximum life from TAC valves.
To maintain non-damaging conditions, clean the system prior to start up. Use a nitrite or
molybdate based treatment program. Use filtration equipment where needed. Properly store
off-line systems and monitor water treatment results using corrosion test coupons.
Durability of valve stems, balls, seats, and packing is dependent on maintaining non-damaging
water conditions. Inadequate water treatment or filtration, not in accordance with chemical
supplier/ASHRAE handbook recommendations, can result in corrosion, scale, and abrasive
particle formation. Scale and particulates can result in stem and packing scratches, and can
adversely affect packing life and other parts of the hydronic system.
Follow the advice of a water treatment professional. Consult EN-205 Water and Steam System
Guidelines, Engineering Information, F-26080, for further details.
Manual Release
Slider
MX41-6043
MX41-6083
3 Insert a small screwdriver or a
1/8” steel pin into one of the
two holes at the top of the
valve shaft. Then rotate the
shaft fully CCW (90° rotation)
to open the valve.
1 Disconnect power
from the actuator.
5 The actuator returns to
normal operation when
power is applied.
4 Release the manual release
slider or button, allowing the
gears to re-engage.
1 Caution: Only use the manual override when
the actuator drive motor is not powered.
Engaging the manual override when the actuator
is powered will cause damage to the gears.
1
3
2 Press and hold the manual
release slider to disengage
the gears.
1
2
2 The position of the ball
opening is indicated by
the index mark on top of
the shaft:
3 It may be necessary to reset
a floating controller driving
an MF41-6043 actuator.
Index Mark on
Top of Shaft
=
2-Way
Closed
(Fully CW)
Outlet
Inlet
Outlet
Inlet
Open
(Fully CCW)
B Full Open to AB
(Fully CW)
AB
A
AB
A
A Full Open to AB
(Fully CCW)
3-Way Mixing
Figure-9 Manually Opening Valve Assemblies Having Mx41-6043 Series Actuators–Old-Style Bracket.