Specifications

64
Symbol Name Symbol Name
MC1,2 Compressor motor TCZ Timer
MF1 Fan motor (indoor) <SW1> Switch (Operation mode)
MF2,3 Fan motor (outdoor) <SW2> Switch (on)
52C1,2 Contactor (compressor) <23WA> Thermostat (room temp.)
52F Contactor (fan I/D) 49F1,2 Internal thermostat (fan O/D)
TB1~3 Terminal block 49C1,2 Internal thermostat (compressor)
F1, F2 Fuse (3.15A) CH1,2 Crankcase heater
Tr Transformer X1,2 Contactor (defrost)
51C1,2 Over current relay (compressor) X3,4 Auxiliary relay (defrost)
51F1 Over current relay (fan I/D) 21S41,2 4-way valve
51F2,3 Over current relay (fan O/D) HZ Auxiliary relay (4-way valve)
63H1-1, 1-2 High-pressure switch T1~4 Timer (defrost)
63H2-1, 2-2 High-pressure switch (defrost) 26D1,2 Thermostat (defrost)
FZ Auxiliary relay (fan)
CZ Auxiliary relay (compressor)
C03,04
11~15, 18
21~25, 28
Connector
30CZ1,2 Auxiliary relay (check)
30FZ Auxiliary relay (check)
CR1~3 Surge killer
Controller connection.
Symbol No. Function
LCD-204RC
terminal no.
1 Power (Active) 24VAC(L)
3 Cooling or Heating operation COMP1
4 Cooling or Heating operation COMP2
5 Reversing valve for Heating operation 4WV
6 Fan operation FAN HI
TB2
7 Power (Neutral) 24VAC(N)
Caution,
1. To protect each Fan motor and Compressor from abnormal current, Over current
relays <51C1,2>, <51F1~3> are installed. Therefore, do not change factory set
value of Over current relays.
2. Do no change the factory set value of all timers.
3. This timer <TCZ> installed because the power supply breaker may operate if two
compressors start at the same time.
Note : 1. The dotted lines show field wiring
2. The figure in the parentheses show field supply parts.
3. Color of earth wire is yellow and green twisting.
4. If the power supply is 380VAC, change the “C03” connector with silver color
tape to one with red color tape
5. Refer below example about wiring mark
MRT150AR
MRT200AR
(STANDARD :
MECHANICAL
CONTROL)
Fig. 1 Control box layout
Fig 2 Unit internal layout