Fedders R407C Service Manual page 48

REMOTE CONTROL AND PC BOARD FUNCTIONAL SPECIFICATIONS
The electronic air-con control system consists of :
I. CONTROL SYSTEM
1) Hand-held Infra-Red transmitter with Liquid Crystal Display panel (hand held unit)
2) Receiver module consisting of:
a) Main receiver Board
b) LED Board
c) Sensor Board
3) The devices that are controlled by this electronic control system are :
a) Outdoor Compressor
b) Outdoor Fan
c) Outdoor 4 way Valve (applicable for Heat Pump Unit only)
d) Indoor Fan, single phase induction, tri- speed
e) Stepper motor
4) Features of this electronic controller include:
a) Operating voltage of 220/240Vac ±10%, 50/60Hz.
b) Step-down transformer that complies with IEC standard specifying High-Pot. test at
1500V.
c) 50 mm x 43 mm Liquid Crystal Display on the hand-held transmitter.
d) Computer Operating Properly (COP) watchdog timer feature for graceful software
reset after any un-recoverable fault.
e) Room temperature control range of 16°C to 31°C.
f) 3-minute compressor switch on delay except on power-up or system reset for
compressor protection.
g) 60-second four-way valve switch over (meaning switch from ON to OFF and vice-
versa) delay after turning off the compressor except on power-up or system reset
(applicable on Heat Pump Unit only).
h) Cool fan prevention measure in heat mode to reduce discomfort to user caused by
circulation of cold air by the indoor fan (applicable on Heat Pump Unit only).
i) Indoor coil overheat protection in heat mode (applicable on Heat Pump Unit only).
j) Indoor coil protection against icing in cool mode (applicable on Heat Pump Unit
only).
k) Outdoor coil protection against icing in heat mode (applicable on Heat Pump Unit
only).
l) Filter dirty LED indication after every 500 hours of operation.
m) On/Off switching hysteresis to prevent frequent switching and to extend live of the
relays.
n) Self-test function for quick production test, system diagnosis and system integrity
checks.
o) Thermistor fault indication.
p) Gas Leaks Protection.
r) Outdoor Coil Overheat Protection in Cool Mode (applicable on Heat Pump Unit
only).
LARGE SPLIT UNIT (18 / 24K)
F1