4 | DESCRIPTION OF UNIT
Ensure hands are free from contaminants and are dry prior to performing
any electrical maintenance work.
Do not touch the heat exchanger fins.
These fins are sharp and could cause injury. If the fins are damaged, this will
affect the heat exchange performance.
Do not place items which might be damaged by moisture under the
Condensation may form if the humidity is above 80%, the drain outlet is
blocked or the filter is dirty.
Ensure condense drainage has a consistent fall away from the unit.
Ensure you do not touch internal parts of the controller.
This could result in serious injury.
Do not use air conditioner where chemicals or gases can affect your
This appliance should only be used by a competent person. Failure to
comply with these instructions may cause serious injury or damage.
When the total capacity of the indoor unit exceeds 100%, ensure the
indoor unit is attenuated.
When the capacity of the indoor unit is greater than or equal to the sum
of 120%, in order to ensure effectiveness of the indoor unit, ensure you
turn the indoor unit on one at a time.
The outdoor unit should be maintained periodically to ensure long life
span of the equipment.
6 720 862 442 (2016/04)
Ensure the communication signal wires do not touch bare copper pipe-
work. The refrigerant circuit will get hot and melt the cables.
2. DESCRIPTION OF UNIT
The air conditioning system consists of an outdoor unit, indoor
units, connective pipework and a way of controlling the system
(remote controller). (see Fig. 1)
Force Cooling Control
Force cooling control
Force Cooling Control
Force cooling control of the outdoor unit is to be pressed when test running.
The unit will start in cooling and once the outdoor unit changes to 62 Hz the
running of the indoor unit will run in high speed. Press the button again to exit
forced cooling mode.
SW2 on the main control board of the outdoor unit is the inspection function
button (as shown in Figure 2-1). Pressing this button once displays the first
Additional button presses will display other parameters following the
sequence shown in Table 2-1.
MDCI Series – All DC Inverter Outdoor Units (Three phase)
Local capacity of outdoor units
Total capacity requirements of
Total requirements of outdoor units
Operating FAN speed and FAN
T2B/T2 average temperature
T3 pipe temperature
T4 environment temperature
Inverter exhaust temperature
Non-inverter exhaust temperature
Heat dissipator surface
Electronic expansion valve
Inverter input current
Non-inverter input current
Exhaust pressure (reserved)
Indoor unit quantity
Quantity of working indoor units
Last fault or protection code