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General Data
UNT-PRC001-EN 15
Piping Packages
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/T’s 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.
• Two-Way/Two-Position Valves
These valves will either fully open or
close in response to a 24VAC 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 24VAC 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.
• Three-Way Modulating Valves
These valves modulate the water flow
through the coil in response to a signal.
Three-way valves allow water that is
directed through the coil to mix with
water that is directed through the bypass
line. This mixture exits through the leaving
water pipe. All modulating valves are
three-wire floating point equal percent-
age valves. The modulating valves are
factory mounted in the leaving water pipe
downstream of the coil.