Trane 750 CFM Trouble Shooting Checklist, Problem Heating Cooling Cause Correction Room too warm

Trouble Shooting

Checklist

!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 pro- vided 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 in- jury.

If operating difficulties are encountered, refer to page 31 and 32 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 Of- fice.

Problem Heating Cooling Cause Correction

Room too warm

(outside air temperature is below 35° F)

X	Main power off	Check fuses
X	Room sensor is not properly set	Reset room sensor temperature
	Room sensor is providing a false reading due	Start the warm-up cycle earlier in the
X	to walls being cold from the night temperature	morning to provide appropriate time-
	setting.	frame to increase room temperature prior
		to space occupation.
	Sensor is mounted on a block wall that is
X	leaking cold air into the room through the	Relocate sensor.
	mounting holes.
		Replace malfunctioning component, or
X	Face and bypass damper, or coil valve is	contact the control’s contractor, or if Trane
	malfunctioning.	controls, see CNT-SVX04A-EN for more
		information concerning Tracer™ controls.

	X	Room sensor is not properly set	Reset room sensor temperature
			Replace malfunctioning component, or
	X	Face and bypass damper or coil control valve	contact the control’s contractor, or if Trane
			controls, see CNT-SVX04A-EN for more
Room too warm		is malfunctioning.	information concerning Tracer™ controls.
(outside air temperature is above 35° F)
	X	OA damper is in the closed position	Ensure OA damper is in the open
			position.
	X	Clogged filter	Replace filter
	X	Control valve is malfunctioning	Check flow of hot water through the
			control valve.
			Check the boiler reset schedule to
	X	Boiler	determine if the loop temperature can be
			decreased.
Room too warm	X	Steam	Check the operation of the control valves
(outside air temperature is above 35° F)
			The economics of the unit ventilator
Unit utilizes Wall Fin auxiliary radiation:
			selection dictate that, in most cases, the
			unit will be sized to provide adequate
	X	Outside air temperature is above 60 to 65° F	natural (ventilation) cooling without
			outside temperatures up to 60-65 F.
			Above this point, a changeover should be
			made to the mechanical cooling cycle.

UV-SVN03D-EN 31