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SK2018 CHV2-V/P-ECM-001
Control Specifications: Flexible Function PCB – W-Type Control
Used in all CHV2 [V/P] W unit configurations.
SK-NCGH-002-ECM is for CHV2 without Electric Heater.
SK-NCGH-003-ECM is for CHV2 with Electric Heater.
Features
a.
Condensate management with valve protection and NC alarm contact.
b.
Integrated fan relays for zone control applications.
c.
ON/OFF thermostat input and low-voltage modulating fan speed input flexibility.
d.
Simple error diagnostic and LED error display.
I/O Port Definitions
I/O
Code
2-Pipe
4-Pipe
Analogue input
Coil temperature sensor AI1
Cooling / heating coil sensor
(Ti1)
Cooling only coil sensor
(Ti1)
Voltage input
High fan speed
H
230VAC input signals from wired thermostat
Medium fan speed
M
Low fan speed
L
EH signal
EH
230 VAC input signals from wired thermostat
Phase
L1
External 230VAC power supply connection to the PCB
Neutral
N1, N2
Earth
GND
Signal Input
Modulating signal
+/-
Low voltage modulating signal input (standard 0~5 VDC,
S1=OPEN; optional 0~10 VDC, S1=CLOSED)
Digital input
Programming interface
TTL
Low voltage digital signal input for board programming
Float switch
Float
Voltage-free (NC)
Voltage output
Water pump
PUMP
Voltage output (L)
EC motor
CN4
5-wire connection
Stepping motor
CN1-2
Low voltage output
EH Relay
CN5
When EH signal input is powered on and EC motor
RPM>300 RPM, EH output is turned on
Digital output
LED display
X-DIS
Low-voltage output
Voltage-free output
Alarm
ALARM
Voltage-free alarm contact:
(a) Standard configuration is (NC)
Onboard configuration
The PCB can be configured for different modulating signal inputs.
Refer to jumper configuration table below.
Code
State
Description
S1
Open
PCB configured for 0~5VDC modulating signal input.
S1
Closed
PCB configured for 0~10VDC modulating signal input.
S3
N/A
Reserved
S4
N/A
Reserved
