Trane Voyager TS 150-300 Series Installation, Operation And Maintenance Manual page 51

Sequence of Operation
If four consecutive open conditions occur during the first
three minutes of operation, the compressor(s) in that
circuit will be locked out, a diagnostic communicated to
Tracer, and a manual reset will be required to restart the
compressor(s).
High Pressure Cutout and Temperature
Discharge Limit
The high pressure controls and temperature discharge
limit are wired in series between the compressor outputs
on the RTRM and the compressor contactors. If the high
pressure safety or temperature discharge limit opens, the
compressor(s) on the affected circuit is locked out. If the
compressor output circuit is opened four consecutive
times during compressor operation, the RTRM will
generate a manual reset lockout.
Lead/Lag Control
Lead/Lag is a selectable input located on the RTRM. The
RTRM is configured from the factory with the Lead/Lag
control disabled. To activate the Lead/Lag function, simply
cut the wire that connects J3-8 to common at the RTRM
Lead/Lag input. When it is activated, each time the
designated lead compressor(s) is shut off due to the load
being satisfied, the lead compressor or refrigeration
circuit switches. When the RTRM is powered up, i.e. after
a power failure, the control will default to the number one
compressor.
Coil Frost Protection
The Frostat™ control monitors the evaporator coil
temperature to prevent the evaporator from freezing due
to low operating temperatures whenever there is a
demand for cooling. When a closed circuit has occurred for
5 seconds minimum, the RTRM turns off all of the cooling
outputs. The Supply Fan will be held "On" until the Frostat
has been opened for 5 continuous seconds or for 60
seconds after the last compressor was shut "Off",
whichever is the longest. The compressor shutdown is
communicated to Tracer, if applicable. There is no local
diagnostic for this condition.
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