72
Note: Multiple Units with Multiple
Thermostats
When several heating and cooling units are
used to condition a space all unit thermostat
switches must be set in either heating mode,
cooling mode or off. Do not leave part of the
units switched to the opposite mode. Cooling
only units must be switched off at the
thermostat during the heating season.
Variable Capacity Compressor
Controller
Units with variable capacity scroll
compressors may include the following
compressor controller. The following is an
explanation of the terminals and
troubleshooting alert flash codes of the
controller. For more information on the
compressor controller, see Emerson Climate
Bulletin AE8-1328.
Note: When using field controls any variable
capacity compressors must run at 100% for 1
minute when starting.
Figure 43 - Variable Capacity Compressor
Controller
Low Voltage Terminals
The compressor controller modulates the
compressor unloader solenoid in an on/off
pattern according to the capacity demand
signal of the system. The following table
shows the linear relationship between the
Polyolester (POE) and Polyvinylether
(PVE) oils are two types of lubricants
used in hydrofluorocarbon (HFC)
refrigeration systems. Refer to the
compressor label for the proper
compressor lubricant type.
To avoid damaging the Compressor
Controller do not connect wires to
terminals C3, C4, T3, T4, T5, or T6.
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