User Guide

F-24392-2 © Copyright 2008 TAC All Rights Reserved. 7
CHECKOUT
1. Make sure the valve stem operates smoothly before installing the valve linkage and the
actuator.
2. If the stem does not operate smoothly, it may indicate that the valve was twisted or
crushed during installation or that the stem was bent by rough handling. These
conditions may require that the valve be replaced.
3. After the piping is under pressure, check the valve body and the connections for leaks.
4. After the valve linkage and the actuator are installed, check their operation.
MAINTENANCE & FIELD REPAIR
Regular maintenance of the total system is recommended to assure sustained performance.
See Table-6 for maintenance kit part numbers.
Table-6 Maintenance Kits for VB-7312 Valves.
Water System
Maintenance
All heating and cooling systems are susceptible to valve and system problems caused by
improper water treatment and system storage procedures. These guidelines are provided to
help avoid valve and water system problems resulting from improperly treated water or
storage procedures in cooling and hot water systems, and to obtain maximum life from TAC
valves.
Figure-4 Typical Boiler Piping When Used in a Hot Water Reset Application.
Boiler
System
Pump
Bypass
Return
Supply
A
A
B
B
Valve
Figure-5 Typical Primary-Secondary Piping.
Secondary
Pump
To Other
Zones
Return
Supply
Coil
From
Other
Zones
Balancing
Cock
Balancing
Cock
A
A
B
B
Valve
Valve Body
Part Number
Replacement
Packing Assembly
Packing Wrench Valve Repair Kit
a
VB-7312-0-4-2
YBA-622-1 TOOL-20-1
RYB-731-2
VB-7312-0-4-4 RYB-731-4
a
Kit includes replacement packing and stem & plug assembly.