Table of Contents
Advertisement
AC/EC-S4 Thermostat Wiring scheme
L1
Hi
Me
Lo
A B
L1
Hi
Me
Lo
Thermostat control specification
Fan Coil Unit ON/OFF
There are 4 ways to turn the system on or off:
a)
By the ON/OFF button wired wall pad.
b)
By the programmable timer on wired wall pad.
c)
By the occupancy contact.
d)
By Modbus setting.
AUTO-RESTART
The system uses a non-volatile memory to save the present operation parameters when the system is turned off or in case of
system failure or cessation of power supply.
2-pipe thermostat control specification (Parameter 17=0)
1)
Cooling mode
a)
If Tr ≥ Ts + 1ºC (Parameter5 setting), then cool operation is activated. MTV1 and AUX1 are turned on. Indoor fan runs at
set speed.
b)
If Tr < Ts, then cool operation is terminated and MTV1 and AUX2 are turned off. Indoor fan runs at set speed or stop
according to parameter18 setting.
c)
The range of Ts is 16 - 30 ºC or fixed according to Parameter 4 setting.
d)
Indoor fan speed can be adjusted for low, medium, high and auto.
GND
S1 C1
A1 A2
DA1
V1
V2
V1
V2
S1 C A1 A2
GND DA1
Legend:
L1: Hi,M,L, V1, V2 power supply;
Hi:
High speed contact;
Med: Medium speed contact;
Lo:
Low speed contact;
V1:
Cooling valve contact;
V2:
Heating valve contact;
S1:
Remote on/off contact;
C1:
COM
A1:
Cooling status signal contact;
A2:
Heating status signal contact;
A/B: RS485 port
Page 60 of 71
SK2019 FSTD-SLIM-EC-FLEX-001_01
Advertisement
Table of Contents
