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Control Specifications: Flexible Function PCB – FLEXI Type Control
Features
a) Integrated fan relays for zone control applications.
b) ON/OFF thermostat input and low-voltage modulating fan speed input flexibility.
c)
Simple error diagnostic and LED error display.
I/O Port Definitions
I/O
Analogue input
Coil temperature sensor
High fan speed
Medium fan speed
Low fan speed
EH signal
Voltage input
Phase
Neutral
Earth
Signal Input
Modulating signal
Programming interface
Digital input
Float switch
Water pump
EC motor
Voltage output
Stepping motor
EH Relay
Digital output
LED display
Voltage-free output
Alarm
Onboard Configuration
The PCB can be configured for different modulating signal inputs.
Refer to jumper configuration table below.
Code
State
S1
Open
S1
Closed
S3
N/A
S4
N/A
Code
AI1
H
M
L
EH
L1
N1, N2
GND
+/-
TTL
Float
PUMP
CN4
CN1, CN2
CN5
X-DIS
ALARM
Description
PCB configured for 0~5VDC modulating signal input.
PCB configured for 0~10VDC modulating signal input.
Reserved
Reserved
2-Pipe
Cooling / heating coil sensor
(Ti1)
230 VAC input signals from wired thermostat
230 VAC input signals from wired thermostat
External 230VAC power supply connection to the PCB
Low voltage modulating signal input (standard 0~5 VDC,
S1=OPEN, optional 0~10 VDC, S1=CLOSED)
Low voltage digital signal input for board programming
Voltage free (NC)
Voltage output (L)
5-wire connection
Low-voltage output
When EH signal input is powered on and EC motor
RPM>300 RPM, EH output is turned on
Low-voltage output
Voltage-free alarm contact:
(a) Standard configuration is (NC).
SK2019 FSTD-SLIM-EC-FLEX-001_01
Page 48 of 71
4-Pipe
Cooling only coil sensor
(Ti1)
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