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UNT-PRC001-EN 37
End Device
Options
End Device Options
All end device options are factory-
installed and tested.
Two-Position Control Valves
Model Number Digits 27 and 28 = A - H
Two-position valve options are available
with either Tracer ZN.010, ZN.510, or
ZN.520. Valves are spring-return type,
sweat connections, and available as
normally open or closed. The valves
respond to a 24V signal and have
1
/
2
-inch
sweat connections. The two-way valve
option will either fully open or close. The
three-way valve option allows either full
water flow through the coil or diverts
waterflow through the bypass. If the
control valve loses power, the valve
returns to its de-energized position. All
control valve options are factory installed
in the leaving water piping downstream
of the hydronic coil. The valve actuator is
easily removable for service without
removing the valve body from piping.
Modulating Control Valves (ZN.520)
Model Number Digits 27 and 28 = J - R
These
1
/
2
-inch sweat connect valves are
three-wire floating point valves, equal
percentage type. Modulating valves are
available in four Cv sizes: 0.7, 1.5, 2.5, and
4.0. The valve responds to a 24V triac
signal from the controller, which deter-
mines the valve position by a control
algorithm. If the valve loses power, it
remains in the position that it was in
when the power loss occurred. All control
valves are factory installed in the leaving
water piping downstream of the hydronic
coil.
Field-Supplied Valves
Model Number Digits 27 and 28 = X or Y
When using field-supplied valves, this
option allows the controller to be factory-
configured for the normal position of the
field-supplied valve.
Note: The Trane Company does not
recommend wild coil applications.
Two-Position Fresh Air Damper Actuator
Model Number Digit 13 = D, E, or F
(Available with all control options except
ZN.520)
This damper actuator uses a 24V signal
and is factory-wired and mounted to the
damper assembly. It allows zero to 50%
fresh air. The damper will drive open to
an adjustable mechanical stop-position
whenever the fan is running during
occupied mode and will spring-return
closed when the fan turns off.
Note: The Trane Company recommends
using the low temperature detection
option with fresh air dampers to detect
possible freeze conditions.