11.0 ELECTRICAL CIRCUIT DIAGRAMS. cont’
ELECTRICAL CIRCUIT DIAGRAM DH300BL THREE PHASE 400V 50Hz (~3N)
MCB CONTACTS / MCB ALARM CONTACTS / MCB AUX CONTACTS SHOWN WITH CIRCUIT BREAKER MANUALLY
SWITCHED TO THE ON CONDITION
ALL OTHER CONTACTS SHOWN IN DE-ENERGISED STATE BUT WITH REFRIGERATION CIRCUIT FULLY CHARGED
WHERE CONTACTS ARE MARKED (N/O) OR (N/C) ON CIRCUIT DIAGRAM ABOVE CONDITIONS APPLY
DEFROST
STAT
MCB's
L(N/C)
C(COM)
C(COM)
H(N/C)
54
54
53
53
L3
L2
L1
14(N/O)
11(COM)
PHASE ROTATION
RELAY
X
X
X
CONTROL MCB
6(N/C)
4(N/C)
2(N/C)
X
CLOSE ON
CLOSE ON
ABOVE HUMIDITY
BELOW TEMP
SETTING
SETTING
6(N/O)
4(N/O)
2(N/O)
6(N/C)
4(N/C)
2(N/C)
1
1
3
3
5
5
6(N/O)
4(N/O)
2(N/O)
2(N/C)
1
1
5
A2
A1
A1
A2
U
W
V
(COM) 1
1
3
5
22
21
L(N/O)
H(N/O)
C
TIMER
DELAY
HUMIDISTAT
THERMAL
O/LOAD
AND
LIGHT IF
DEFROST
LIGHT
IN
TER
LO
CK
T
ER
M
IN
A
LS
CONTACTORS
FAN
COMPRESSOR
HEATER
(S
)
AIR LIMIT
STAT
1
2
LP SWITCH
(BREAKS TO 'H' ON
PRESSURE FALLING)
HP SWITCH
(BREAKS TO 'L' ON
PRESSURE RISING)
FA
U
LT
L
IG
H
T
FAN
MCB AUX NC
COMPRESSOR
MAINS LIGHT
L2 L3
L1
3
MCB AUX NC
CONTROL BOX MCB
CONDENSATE PUMP/
CONTROL BOX
SOFT START
FITTED
IN
TE
RL
O
CK
TE
RM
IN
A
LS
CONT
CYCLE
SELECT SWITCH
STANDBY SWITCH
RUN (N/O) 2
3 (N/C) STANDBY
CONDENSATE PUMP/
CO
M
P
AU
X
(
NC
)
N
C
(COM)
L
(N/C)
6
7
8
9
1
2(N/C)
MCB SETTING VALUES
DESCRIPTION
COMPRESSOR
FAN
CONTROL
PUMP
CONTROL
VALUE
11.9
20
2.5
2.0
10V
N
L
IN
GND
FAN SPEED CONTROLLER
10V
0V
1
2
3
25
SD208050 ISSUE 44