Installation and Maintenance Manual

72 UV-SVN03F-EN
Startup
Tracer ZN520 Unit Startup
Refer to the most recent version of Trane publication CNT-
SVX04A-EN (Tracer ZN520 Unit Controller: Installation,
Operation and Programming Guide). The factory pre-
programs the ZN520 with default values to control the
temperature and unit airflow. Use Tracer Summit building
automation system or Rover™ software to change the
default values.
Follow the procedure below to operate the ZN520 in a
stand-alone operation:
1. Turn power on at the disconnect switch option.
2. Position the fan mode switch to either high, medium,
low, or the auto position.
3. Rotate the setpoint dial on th
e zone sensor module to
55°F for cooling or 85°F for heating.
The appropriate control valve will
actuate assuming the
following conditions:
1. Room temperature should be greater than 55°F and
less than 85°F.
2. For a 2-pipe fan-coil unit with an autom
atic changeover
sensor, the water temperature input is appropriate for
the demand placed on the unit. For example, cooling
operation is requested and cold water (5° lower than
room
temperature) flows into the unit.
3. Select the correct temperature setpoint.
Note: S
elect and enable zone sensor temperature
settings to prevent freeze damage to unit.
Tracer UC400 Unit Startup
Refer to the most recent version of Trane publication BAS-
SVX48B-EN (Installation, Operation, and Programming:
Tracer UC400 Programmable Controller) for Tracer UC400
unit ventilator. The factory pre-programs the Tracer UC400
unit ventilator with default values to control the
temperature and unit airflow. Use Tracer SC building
automation system or Tracer TU software to change the
default values.
Follow the procedure below to operate the Tracer UC400 in
a stand-alone operation:
1. Turn power on at the disconnect switch option.
2. Position the fan mode switc
h to either high, medium,
low, or the auto position.
3. Rotate the setpoint dial on th
e zone sensor module to
55°F for cooling or 85°F for heating.
The appropriate control valve will
actuate assuming the
following conditions:
1. Room temperature should be greater than 55°F and
less than 85°F.
2. For a 2-pipe fan-coil unit with an autom
atic changeover
sensor, the water temperature input is appropriate for
the demand placed on the unit. For example, cooling
operation is requested and cold water (5° lower than
room temperature) flows into the unit.
3. Select the correct temperature setpoint.
Note: Select and enable zone sensor temperature
settings to prevent freeze damage to unit.
General Information
Manual Fan Speed Switch
The manual fan mode switch is available with a four-
position switch (off-hi-med-lo) allows manual fan mode
selection and is available unit- or wall-mounted. See
Figure 59.
The fan speed switch can be used to provide simultaneous
fan speed customer requests in addition to external
controller fan speed request. The wall-mounted option is
low-voltage and has three 24-volt relays using a factory-
wired transformer and relays to control the fan motor.
Fan Mode Switch Operation
Off
Fan is turned off, two-position damper option spring-
returns closed.
Hi, Med, Lo
Fan runs continuously at the selected speed. The two-
position damper option opens to an adjustable
mechanical stop position.
Tracer ZN520 Operation
Off
Fan is off; control valve options and fresh air damper
options close. The low air temperature detection option is
still active.
Auto
Fan speed control in the auto setting allows the
modulating (3-wire floating point) or 2–position control
valve option and three-speed fan to work cooperatively to
meet precise capacity requirement, while minimizing fan
Figure 59. Fan speed switch
UV-SVN03_.book Page 72 Thursday, January 24, 2013 5:27 PM