Diagnostics And Troubleshooting - Trane VUV Installation, Operation And Maintenance Manual

Diagnostics and Troubleshooting

This section is intended to be used as a diagnostic aid only. For
detailed repair procedures, contact your local Trane service
representative.
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on the tags, stickers, and labels could result in death or serious
injury.
Technicians, in order to protect themselves from potential electrical, mechanical, and chemical hazards, MUST follow
precautions in this manual and on the tags, stickers, and labels, as well as the following instructions: Unless
specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing
devices such as capacitors 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 perform these tasks.
Table 37. Troubleshooting recommendations
Symptom Heat Cool
X
X
Room too warm X
(outside air
temperature is
X
below 35°F)
X
X
Room too warm
X
(outside air
temperature is
above 35°F) X
X
X
Room too warm
X
(outside air
temperature is
X
above 35°F)
Unit utilizes Wall
Fin auxiliary
X
radiation:
X
X
X
Room too cool
X
X
Room too cool
Unit utilizes Wall
X
Fin auxiliary
radiation:
X
X
X
Room too hot
X
X
X
Motor
X
96
Probably Cause
Main power off.
Room sensor is not properly set.
Room sensor is providing a false reading due to walls being cold
from the night temperature setting.
Sensor is mounted on a block wall that is leaking cold air into the
room through the mounting holes.
Face-and-bypass damper, or coil valve is malfunctioning.
Room sensor is not properly set.
Face-and-bypass damper or coil control valve is malfunctioning.
OA damper is in the closed position.
Clogged filter.
Control valve is malfunctioning.
Boiler.
Steam.
Outside air temperature is above 60°F to 65°F.
Room sensor is not properly set.
Clogged filter.
Face-and-bypass damper, or coil valve is malfunctioning.
OA damper is in the open position.
Boiler pressure or temperature design requirements not being
met.
Radiation controls malfunctioning.
Room sensor is not properly set.
Clogged filter.
Face and bypass damper, or coil valve is malfunctioning.
OA damper is in the open position.
Chiller temperature design requirements not being met.
If the motor fails to start, and other motors on the same circuit are
functioning.
If the motor fails to start, and other motors on the same circuit are
functioning.
WARNING
Recommended Action
Check fuses.
Reset room sensor temperature.
Start the warm-up cycle earlier in the morning to provide
appropriate time-frame to increase room temperature prior to
space occupation.
Relocate sensor.
Replace malfunctioning component, or contact the control's
contractor, or if Trane controls, see CNT-SVX04*-EN for more
information concerning Tracer® controls.
Reset room sensor temperature.
Replace malfunctioning component, or contact the control's
contractor, or if Trane controls, see CNT-SVX04*-EN for more
information concerning Tracer® controls.
Ensure OA damper is in the open position.
Replace filter.
Check flow of hot water through the control valve.
Check the boiler reset schedule to determine if the loop
temperature can be decreased.
Check the operation of the control valves.
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.
Reset room sensor temperature.
Replace filter.
Replace malfunctioning component, or contact control's
contractor. For Trane controls, see CNT-SVX04*-EN Tracer®
ZN520 Unit Controller Installation, Operation and Programming
Ensure OA damper is in the closed or minimum outside air
position.
On hot water and steam type units, check the boiler pressure or
temperature to ensure that the requirements are being met.
Check the operation of the wall fin controls.
Reset room sensor temperature.
Replace filter.
Replace malfunctioning component, or contact the control's
contractor, or if Trane controls, see CNT-SVX04*-EN for more
information concerning Tracer® controls.
Ensure OA damper is in the minimum outside air position.
Check the temperature of the water leaving the chiller to ensure
that it meets design requirements.
Check the unit switch to ensure it is in the ON position.
Check for loose switch or motor connection.
UV-SVX005G-EN