Installation and Maintenance Manual

88 UV-SVN02C-EN
Diagnostics
Troubleshooting Checklist
If operating difficulties are encountered, refer to the
following table for probable causes and corrective
measures. If suggested corrective measures have been
taken, and the trouble still persists, contact the control
supplier or the local Trane Sales Office.
WARNING
Hazardous Service Procedures!
The maintenance and trouble shooting procedures
recommended in this section of the manual could
result in exposure to electrical, mechanical or other
potential safety hazards. Always refer to the safety
warnings provided throughout this manual concerning
these procedures. When possible, disconnect all
electrical power including remote disconnects before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components per these tasks. Failure to follow
all of the recommended safety warnings provided,
could result in death or serious injury.
Problem Heating Cooling Cause Correction
Room too warm
(outside air temperature is
below 35°F)
XMain power off. Check fuses.
X Room sensor is not properly set. Reset room sensor temperature.
X Room sensor is providing a false reading due
to walls being cold from the night
temperature setting.
Start the warm-up cycle earlier in the morning
to provide appropriate time-frame to increase
room temperature prior to space occupation.
X Sensor is mounted on a block wall that is
leaking cold air into the room through the
mounting holes.
Relocate sensor.
X Face and bypass damper, or coil valve is
malfunctioning.
Replace malfunctioning component, or
contact the control’s contractor, or if Trane
controls, see CNT-SVX04A-EN for more
information concerning Tracer controls.
Room too warm
(outside air temperature is
above 35°F)
X Room sensor is not properly set. Reset room sensor temperature.
X Face and bypass damper or coil control valve
is malfunctioning.
Replace malfunctioning component, or
contact the control’s contractor, or if Trane
controls, see CNT-SVX04A-EN for more
information concerning Tracer controls.
X OA damper is in the closed position. Ensure OA damper is in the open position.
X Clogged filter. Replace filter.
Room too warm
(outside air temperature is
above 35°F)
Unit utilizes Wall Fin auxiliary
radiation:
X Control valve is malfunctioning. Check flow of hot water through the control
valve.
X Boiler. Check the boiler reset schedule to determine
if the loop temperature can be decreased.
X Steam. Check the operation of the control valves.
X Outside air temperature is above 60°F to
65°F.
The economics of the unit ventilator selection
dictate that, in most cases, the unit will be
sized to provide adequate natural
(ventilation) cooling without outside
temperatures up to 60°F to 65°F. Above this
point, a changeover should be made to the
mechanical cooling cycle.
UV-SVN02_-EN.book Page 88 Thursday, January 24, 2013 4:48 PM