Trane YSC036G - Pre-Start; Compressor Crankcase Heaters (Optional); ReliaTel Controls

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Pre-Start

50 RT-SVX21AC-EN

Note: Upon closing main power disconnect and the unit

mounted disconnect switch or circuit breaker, the

phase monitor will verify proper phasing. If LED on

face of the monitor is red, correct supply power

fault.

To prevent injury or death from electrocution, it is the

responsibility of the technician to recogniz

e this hazard

and use extreme care when performing service

procedures with the electrical power energized.

• Observe the ABC and CBA phase indicator lights on the

ce of the se

quencer. The ABC indicator light will glow

if the phase is ABC. If the CBA indicator light glows,

open the disconnect switch or circuit protection switch

and reverse any two power wires.

• Restore the main electrical power and recheck the

hasing. If th

e phasing is correct, open the disconnect

switch or circuit protection switch and remove the

phase sequence indicator.

Compressor Crankcase Heaters (Optional)

Each compressor can be equipped with a crankcase heater

(on some units the crankcase heater comes standard). The

proper operation of the crankcase heater is important to

maintain an elevated compressor oil temperature during

the “Off” cycle to reduce oil foaming during compressor

starts. Oil foaming occurs when refrigerant condenses in

the compressor and mixes with the oil. In lower ambient

conditions, refrigerant migration to the compressor could

increase.

When the compressor starts, the

sudden reduction in

crankcase pressure causes the liquid refrigerant to boil

rapidly causing the oil to foam. This condition could

damage compressor bearings due to reduced lubrication

and could cause compressor mechanical failures.

Before starting the unit in the “Cooling” mode, set the

system

switch to the “Off” position and turn the main

power disconnect to the “On” position and allow the

crankcase heater to operate a minimum of 8 hours.

Before closing the main power disc

onnect switch, insure

that the “System” selectio

n switch is in the “Off” position

and the “Fan” selection switch is in the “Auto” position.

Close the main power disconnect switch and the unit

ounted

disconnect switch, if applicable.

Note: Upon closing main power disconnect and the unit

mounted discon

nect switch or circuit breaker, the

phase monitor will verify proper phasing. If LED on

face of the monitor is red, correct supply power

fault.

To prevent injury or death from electrocution, it is the

responsibility of the

technician to recognize this

hazard

and use extreme care when performing service

procedures with the electrical power energized.

ReliaTel™ Controls

Upon power initialization, the RTRM performs self-

diagnostic checks to insure that all internal controls are

functional. It also checks the configuration parameters

against the components connected to the system. The

Liteport LED located on the RTRM module is turned “On”

within one second of power-up if internal operation is

okay.

Use one of the following “Test” procedure to bypass some

time

delays and to start the unit at the control panel. Each

step of unit operation can be activated individually by

temporarily shorting across the “Test” terminals for two

to three seconds. The Liteport LED located on the RTRM

module will blink when the test mode has been initiated.

The unit can be left in any “Test” step for up to one hour

before it will automatically terminate, or it can be

terminated by opening the main power disconnect switch.

Once the test mode has been terminated, the Liteport LED

will glow continuously and the unit will revert to the

“System” control.

WARNING

Live Electrical Components!

Failure to follow all electrical safety precautions when

exposed to live electrical components could result in

death or serious injury. When 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.