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USER GUIDE
Depending on the unit's voltage rating, each load is directly
connected to either L1 or Neutral. L2 is switched by the
dedicated relay.
Checking Relay Outputs
When a component is not running, determine if the related
relay output is working properly. The relays should cut in
and off according to the logic sequences of the controller
(see Figure 13). To check an output, disconnect the input
line to the relay and the output wire (e.g., to check K10,
disconnect both wires on 19 and 20 terminals). Ohm out
the relay terminals and check if the contact is closed when
the relay is activated. Replace the board when a faulty
relay stays open or becomes shorted.
L1
L2
POWER
SUPPLY
Load10
Load9
Load8
Load7
Load6
Load5
Load4
Load3
Load2
Load1
Line
Figure 13: Relay Outputs Diagram
KEYPAD – STANDARD CONTROLLER
The RS485(1) port on the relay board is used to connect
the keyboard (see Figure 14).
Troubleshooting
26
Transformer
25
24
23
22
21
20
K10
19
18
K9
17
16
K8
15
14
K7
13
12
K6
11
10
K5
9
8
K4
7
6
K3
5
4
K2
3
2
K1
1
RS485(1)
Connection on Relay Board
Figure 14: Port Connecting Relay Board to Keyboard
Keypad Troubleshooting
Problems with the Keypad may include:
Ground Connection Missing
Negative (-) connection missing
Positive (+) connection missing
12V Connection missing
Keypad faulty
MAIN BOARD – TOUCH SCREEN CONTROLLER
Each unit is equipped with a Main Board where the
electrical components are connected. The board has
9 outputs (8 relays plus one PWM output for evaporator
variable speed). The relays control various components.
RELAY
U1-N
U2-N
U3-N
U4-N
U5-N
U6-N
U7-N
U8-N
PWM
Checking Relay Outputs
The Touch Screen Controller is able to show actual state of
relays through I/O menu (see Figure 15).
38
Connection on Keyboard
Display flashes and dims
Display may work without specific
alarm
Error Code "Err" is displayed
Display does not light.
All connections are present but
display does not work.
RELATED COMPONENT
COMPRESSOR CONTACTOR COIL
THAWING
DEFROST
THAWING
NONE
PUMP DOWN VALVE
DOOR FRAME HEATER
CONDENSER FAN
EVAPORATOR FAN
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