Trane Precedent® Rooftop Units YHC072

WARNING: Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury. Before completing the following checks, turn the unit OFF and lock the main power disconnect switch open.

Inspect the return air filters. Clean or replace them if necessary.

Return Air Smoke Detector Maintenance

Airflow through the unit is affected by the amount of dirt and debris accumulated on the indoor coil and filters.To insure that airflow throughtheunitisadequateforproper sampling by the return air smoke detector, complete adherence to the maintenance procedures, including recommended intervals between filter changes, and coil cleaning is required.

Periodic checks and maintenance procedures must be performed on the smoke detector to insure that it will function properly. For detailed instructions concerning these checks and procedures, refer to the appropriate section(s) of the smoke detector Installation and Maintenance Instructions provided with the literature package for this unit.

During maintenance, the switch float (black ring) must be checked to ensure free movement up and down.

Check the unit's drain pans and condensate piping to ensure that there are no blockages.

Inspect the evaporator and condenser coils for dirt, bent fins, etc. If the coils appear dirty, clean them according to the instructions described in 'Coil Cleaning' later in this section.

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

An evaporator condensate drain connection is provided on each unit. Refer to Figure 16, p. 25 and Figure 17, p. 25 for the appropriate drain location.

The condensate drain pan is factory installed to drain condensate to the back side of the unit. See Figure 16, p. 25 and Figure 17, p. 25. It can be converted to drain condensate out the front side of the unit or through-the-base.

To convert drain condensate out the front of unit:

1. Remove evaporator access panel and supply air access panels.

2. Remove the support panel that the condensate drain pan exits through.

3. Slide the condensate drain pan out of the unit and rotate 180°.

4. Slide the condensate drain pan back into the unit, align the drain with the grommeted opening in the rear support panel and push until the coupling is seated in the grommet.

WARNING: Live Electrical Components! During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

WARNING: Rotating Components! During installation, testing, servicing and troubleshooting of this product it may be necessary to work with live and exposed rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks. Failure to follow all safety precautions could result in rotating components cutting and slashing technician which could result in death or serious injury.

Fan belts inspected and in good condition?

Replacement necessary due to frayed or worn belts?

Belts loosened using the belt tension adjustment bolts on the motor mounting base?

Enter the center-to-center shaft distance (in inches) between the fan and motor sheaves.

Enter the amount of belt deflection that corresponds to the proper belt tension.

Large O-ring on the belt tension gauge set at the deflection value?

Small O-ring set at zero on the force scale of the gauge plunger?

Warning: This procedure requires trained personnel with PPE!

Heat Compartment access panel removed

Pipe assembly removed from the manifold

90° elbow unscrewed from 61/2\ nipple"

Rubber grommet slid off of nipple

Plastic plug removed from the hole in the center post

Grommet inserted into the hole in the center post

90° elbow attached to the gas supply line using pipe sealant

5\ pipe nipple and union disconnected from the \"Through-the-Base Gas\" kit assembly"

WARNING: Heavy Objects! Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted.

Each of the cables (chains or slings), hooks, and shackles used to lift the unit is capable of supporting the entire weight of the unit.

Lifting cables (chains or slings) are of the same length or adjusted for even unit lift.

WARNING: Improper Unit Lift! Test lift unit approximately 24 inches to verify proper center of gravity lift point.

Unit is properly rigged and balanced after test lift.

Adequate strength lifting slings are attached to all four lifting brackets in the unit base rail.

A lifting bar is installed to protect the unit and to facilitate a uniform lift.

Minimum distance between the lifting hook and the top of the unit (should be 7 feet).