Catalogue

UNT-PRC001-EN 21
General Data
The deluxe piping package also includes a strainer on the entering water pipe and unions at the
coil connections along with the basic components. The strainer body is cast brass construction,
with a stainless steel mesh strainer that is easily removed for cleaning. The unions are forged brass
construction and close with a minimum amount of effort.
End Valves
Each piping package includes a ball valve for the entering water pipe and one of the following end
valves on the leaving water pipe: ball valve, manual circuit setter, or an auto circuit setter. These
valves serve as the field connection points on all UniTrane piping packages.
Ball Valves. Ball valves, also known as stop or end valves, allow the unit to be cut off for service
purposes. These valves have a two-inch handle that rotates 90 percent to a fully open position. The
valve body is cast brass, and the ball is polished brass with a Teflon
®
seat. Ball valves are available
as end valves on both the entering and leaving water pipes.
Manual Circuit Setter
In lieu of a ball valve on the leaving water pipe, a manual circuit setter, also known as a manual flow
control valve, acts as both a flow setting device and a stop valve. This valve allows water flow
through the fan-coil unit to be set quickly and accurately.
The manual circuit setter includes Schrader ports in the valve body. These ports are used to
measure the pressure drop across the valve. This pressure drop can be compared to factory
supplied curves that relate the pressure drop to a specific flow rate. This valve also has a memory
stop so the correct setting can be found quickly.
Auto Circuit Setter
An auto circuit setter is an automatic flow control device available on the leaving water pipe. The
auto circuit setter includes a cartridge within the valve body that is sized to allow a specific flow
rate through the coil. This valve sets flow through the coil without any action required by a system
piping balancer. The auto circuit setter is available on the leaving water pipe with a ball valve. The
auto circuit setter also includes two P/Ts plugs in the valve body to allow measurement of the
pressure drop temperature through the valve.
Control Valves
Piping packages are available with or without control valves. All control valve options are factory
mounted and wired to the UniTrane fan-coil controls.
Tw o - Wa y / Tw o - P o s i t i o n Va l v e s
These valves will either fully open or close in response to a 24 Vac signal from the Trane controller.
Main control valves are direct-acting valves, while the auxiliary valves are reverse-acting. All
control valves are factory mounted in the leaving water pipe downstream of the coil. Some means
of relieving pump head pressure should be accounted for when two-way valves are selected.
Normally open or normally closed valves are available.
Three-Way/Two-Position Valves
These valves will either allow full water flow through the coil or divert the flow through a bypass
line. The valves respond to a 24 Vac signal from the Trane controller. Main control valves are direct
acting valves, while the auxiliary valves are reverse-acting. All three-way valve packages include
a balance fitting in the bypass line to allow flow balancing in the bypass position. Three-way valves
are factory mounted in the leaving water pipe downstream of the coil. Normally open or normally
closed valves are available.
Two-Way Modulating Valves
These valves modulate the water flow through the coil in response to a signal from the Trane
controller. All modulating valves are three-wire floating point equal percentage valves. The
modulating valves are factory mounted in the leaving water pipe downstream of the coil.
Piping Packages
UNT-PRC001-EN.book Page 21 Tuesday, May 8, 2012 10:54 AM