Catalogue

CAB-PRC001-EN 39
Controls
Manual Output Test Function
This feature is an invaluable tool for troubleshooting a unit. By simply pressing the controller’s test
button, service personnel can manually exercise outputs in a pre-defined sequence.
Peer to Peer Communication (Tracer ZN510, ZN520, and UC400)
Peer to peer communication allows multiple units in one space to share the same zone sensor and
provide simultaneous heating. The Tracer ZN510 or ZN520 controller can share information
between units on the same communication link using a twisted pair wire in the field. Unit
configuration must be modified with Rover service tool. On the UC400, zone sensor data sharing
can be accomplished by use of the BAS system controller.
Tracer ZN520 and UC400 Additional Features
Filter Maintenance Status
Tracer controller has an adjustable timer that indicates through the building automation system or
the service software tool when filter maintenance is necessary. Filter maintenance status is based
on cumulative fan run hours.
Water Valve Override
Using the building automation system or the service software tool, the water valve override
function drives all water valves in every unit fully open simultaneously. This helps reduce the time
required for waterside balancing.
Cascade Control
Tracer controller maintains discharge air temperature using a cascade control algorithm. The
discharge air temperature is based on the difference between the space temperature and setpoint.
Unit capacity modulates to achieve the discharge air temperature.
Interoperability
Tracer ZN520 can be used with a Tracer Summit system or on other control systems that support
LonTalk
®
and the SCC profile. For more information on specific inputs and outputs, see UNT-IOM-6
(Installation, Operation, and Maintenance: UniTrane
®
Fan-Coil Room Conditioners - Force Flo™
Cabinet Heaters), or the most recent version.
The Tracer UC400 can be used with the Tracer SC or another BACnet MS/TP building automation
system. For more information see the Installation Operation and Programming Guide BAS-SVX48
for more information.
End Device Options
All end device options are factory-installed and -tested.
Two-Position Control Valves; Model Number Digits 27 & 28 = A–H
Two-position valve options are available with either Tracer ZN010, ZN510, ZN520, or UC400. Valves
are spring-return type, sweat connections, and available as normally open or closed. The valves
respond to a 24 V 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 (Tracer ZN520 and UC400); Model Number Digits 27
& 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 24 V
CAB-PRC001-EN.book Page 39 Tuesday, May 8, 2012 10:11 AM