American Standard YSC036A Installation, Operation And Maintenance Manual page 35

Pre-Start
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.
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.
• Observe the ABC and CBA phase
indicator lights on the face of the
sequencer. 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 phasing.
If the 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. 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.
RT-SVX21F-EN
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
disconnect switch, insure that the
"System" selection 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 mounted
disconnect switch, if applicable.
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.
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.
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