Note: Low Ambient Operation
Units without a low ambient option, such as
condenser fan cycling or the 0°F low
ambient option, will not operate in the
cooling mode of operation properly when
the outdoor temperature is below 55°F. Low
ambient and/or air handling unit economizer
options are recommended if cooling
operation below 55°F is expected.
Note: Multiple Systems with Multiple
Thermostats
When several heating and cooling split
systems are used to condition a space all
thermostat switches must be set in either
heating mode, cooling mode or off. Do not
leave part of the systems switched to the
opposite mode. Cooling only systems should
be switched off at the thermostat during the
heating season.
Wiring Diagrams
Unit specific wiring diagram is laminated in
plastic and located inside the controls
compartment door.
General Maintenance
When the initial startup is made, and on a
periodic schedule during operation, it is
necessary to perform routine service checks
on the performance of the condensing unit.
This includes reading and recording suction
pressures and checking for normal sub-
cooling and superheat.
COMPRESSOR CYCLING
5 MINUTE MINIMUM OFF TIME
To prevent motor overheating
compressors must cycle off for a
minimum of 5 minutes.
5 MINUTE MINIMUM ON TIME
To maintain the proper oil level
compressors must cycle on for a
minimum of 5 minutes.
The cycle rate must not exceed 6
starts per hour.
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