1.3 Description of the unit's main control panel
1. YKN2 Open circuit board
2. Accessory circuit board
T1. 230 V / 24 V Transformer
F1. Compressor 1 circuit breaker
F2. Compressor 2 circuit breaker
F3. Circuit breaker for supply air fan
F4. Circuit breaker for outdoor fan
FC. Sequence and phase fault sensor
F9. Circuit breaker for compressor case and
230 V transformer heating resistors
F10. 24 V transformer
KM1. Compressor 1 motor contactor
KM2. Compressor 2 motor contactor
KM3. Supply air draft blower contactor
KM4. Outdoor draft blower contactor
Q3. Main switch for the unit
The main control panel is found on the unit itself and
is protected from the outside by a removable metal
panel.
Given that the air conditioning unit is installed on the
roof of a building or property, users must under no
circumstances inspect or adjust the unit themselves.
All of inspections or adjustments that may be made
by the user are performed using the DPC-1 thermo‐
stat.
If the air conditioning unit is faulty, its self-diagnostics
system will identify the source and the pilot light -1-
on the display of the DPC-1 thermostat will switch on.
The display will also show a two-digit number on the
lower left 2indicating the effected component. See
Placing the unit out of service for a planned stoppage
or breakdown.
, see on page 9 .
If the thermostat display keeps showing the pilot light -1- and any fault code or if the air conditioner does
not start, contact a Johnson Controls Inc. Authorised Technical Assistance Service.
1.4 Modes of operation
The Roof Top ACTIVA range of air conditioning units includes different models: the operating mode for
each one varies depending on the specific model.
User manual
1
Description of the unit's main control panel
1.3
5