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NOTE

: The unit may be operated with an Evolution Connex

Control or a standard 2--stage thermostat. Evolution Connex
Control will utilize 5 stages cooling, while 2--stage thermostat will
only allow 2 discrete stages of cooling operation.

Variable Speed Compressor

This unit contains a variable speed rotary compressor that has a

wide operating range. It operates on a variable 3 phase sine wave
provided by the inverter. This compressor can only be operated by

the specific inverter supplied with the unit.

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

and/or improper operation.
Do not attempt to apply line voltage directly to the

compressor. This will destroy the compressor.

CAUTION

Field control Connections

For communicating operation use the communication Evolution

plug only. Only two wires, AB (color), are required. If necessary,

connect C for additional grounding (see Fig. 6). If using standard
2--stage thermostat, connect discrete inputs (R,C,Y2,Y1) for

2--stage control in cooling modes.

Pressure Transducer (SPT)

A 5 VDC output low pressure transducer that provides a 0--5 VDC
data for interpretation by the control board for a 0 to 200 psig

range of pressure at the suction tube. This interpreted pressure data
is then intelligently used by the AOC control board for low

pressure cut--out, loss of charge management, compressor

protection,

oil

circulation

management,

and

lubrication

management.

Pressure Equalizer Valve (PEV)

At the end of every compressor operation (after the 3.5 minute

Time Guard period), the equalizer valve opens for 150 seconds
plus an additional 15 seconds of protection before allowing the

compressor to start ramping up.
The PEV is located next to the suction and discharge of the

compressor.

The function of this valve is to prevent the

compressor from starting with a high refrigerant pressure

differential, thus helping the reliability of the compressor.

NOTE

: A hissing sound may be heard during the equalization

process. This is normal.

TROUBLESHOOTING

Systems Communication Failure

If communication is lost with the User Interface (UI), the control
will flash the appropriate fault code (see Table 6). Check the wiring

to the User Interface and the indoor and outdoor units and power.

Model Plug

Each control board contains a model plug. The correct model plug
must be installed for the system to operate properly (see Table 3).
The model plug is used to identify the type and size of unit to the

control.
On new units, the model and serial numbers are inputted into the

AOC board’s memory at the factory. If a model plug is lost or
missing at initial installation, the unit will operate according to the

information input at the factory and the appropriate error code will
flash temporarily. An RCD replacement AOC board contains no

model and serial information. If the factory control board fails, the

model plug must be transferred from the original board to the
replacement board for the unit to operate.
When installing AC unit with older fan coils, a model plug change
may be required.

NOTE

The model plug takes priority over factory model

information input at the factory. If the model plug is removed after
initial power up, the unit will operate according to the last valid
model plug installed, and flash the appropriate fault code
temporarily.

Table 3 – Factory Supplied Model Plug Information

189BNV0

MODEL PLUG

NUMBER

PIN RESISTANCE

(K---ohms)

Pins 1---4

Pins 2---3

HK70EZ028

11K

180K

HK70EZ011