CONTROL
2.5A
MCB SETTINGS
COMPRESSOR FAN
2.8A23.8A
MCB CONTACTS / MCB ALARM CONTACTS / MCB AUX CONTACTS
SHOWN WITH CIRCUIT BREAKER
MANUALLY SWITCHED TO THE ON CONDITION.
WATER FLOW SWITCH CONTACTS SHOWN WITH WATER FLOW AT
MAXIMUM RATE.
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
(COM) C
(N/C) L
H (N/O)
10 (SECS)
COMP 2
CIRCUIT BREAKER
TRIP / OFF =
BREAK CONTACT
5
3
1
6 (N/C)
4 (N/C)
2 (N/C)
COMP 1
CIRCUIT BREAKER
TRIP / OFF = BREAK CONTACT
5
3
1
6 (N/C)
4 (N/C)
2 (N/C)
(BREAKS TO 'H' ON
TEMP FALLING)
DEFROST STAT
TRIP / OFF =
BREAK CONTACT
FAN CIRCUIT BREAKER
5
3
1
6 (N/C)
4 (N/C)
2 (N/C)
FAN MCB AUX BLK : ALARM
TRIP = BREAK CONTACT
COMPRESSOR 1
MCB AUX BLK : ALARM
TRIP = BREAK CONTACT
COMPRESSOR 2
MCB AUX BLK : ALARM
TRIP = BREAK CONTACT
6 (N/C)
4 (N/C)
2 (N/C)
CONTROL CIRCUIT
BREAKER
5
3
1
TRIP / OFF =
BREAK CONTACT
L3 L2 L1
PHASE ROTATION RELAY
L3
L2
L1
14 (N/O)
MAINS LIGHT
NEUTRAL
12 (N/C)
11 (COM)
5
3
1
6 (N/O)
4 (N/O)
2 (N/O)
FAN
96
95 (N/C)
95
96 (N/C)
(N/C)
C (COM)
H (N/C)(N/O) L
C (COM)
H (N/O)
(N/C) L
FAULT LIGHT
COMPRESSOR 2 MOTOR
PROTECTOR
HP SWITCH
(BREAKS TO 'L' ON
PRESSURE RISING)
LP SWITCH
(BREAKS TO 'H' ON
PRESSURE FALLING)
STARTER OR
EXTERNAL FLOW
SWITCH
SOFT START
THERMAL O/LOAD &
FAULT LAMP IF
FITTED
WATER FLOW
SWITCH (N/O)
A
B
RELAY (R3)
FLOW OK LIGHT
(COM) 1
3 (N/C)
[STANDBY]
2 (N/O)
[RUN]
STANDBY SWITCH
(COM) 6
4 (N/O)
MAKES 4 TO 6 ON TEMP FALLING
11
10
SENSOR
DIGITAL STAT (2 STAGE)
5
3
1
6 (N/O)
4 (N/O)
2 (N/O)
COMP
2
(N/O) 11 14 (COM)
DELAY TIMER T3
21 22 (N/C)
A1
A2
CONTACTOR
(COMP 2)
(W)
(V)
(U)
(N/O)
5 (N/C)
4 (N/O)
1 (N/C)
(COM) 7
RELAY (R2)
(COM) 15
18 (N/O)
16 (N/C)
DELAY TIMER T1 (12 HOUR)
A1 A2
(COM) 7
8 (N/O)
9 (N/C)
2 (N)
C (COM)
H (N/O)
(N/C) L
TEMP OK
LIGHT
OUT 1 OUT 2
CHILL LIMIT
LIGHT
A
B
RELAY (R1)
CONTACTOR (FAN)
A2A1
A1
A2
(N/C) 1
7 (COM)
(N/O) 4
(N/C) 3
9 (COM)
(N/O) 6
CHILL LIGHT
REVERSING VALVE
HEAT LIGHT
CHILL LIMIT
SWITCH
(BREAKS TO 'H' ON
TEMP FALLING)
MAKES 8 TO 7 ON TEMP RISING
DEFROST LIGHT
1 (L)
INTERLOCK
TERMINALS
5
3
1
6 (N/O)
4 (N/O)
2 (N/O)
COMP
1
21 22 (N/C)
CONTACTOR
(COMP 1)
(W)
(V)
(U)
A1
A2
18 (N/O)
(COM) 15
A2A1
DELAY TIMER T2
(6 MINS)
54 53 (N/O) 54 53 (N/O)
COMP 1 MCB AUX COMP 2 MCB AUX
16 (N/C)
63 64 (N/0)
LIQUID LINE
SHUT OFF
VALVE
COMP 1 CONT AUX
63 64 (N/0)
COMP 2 CONT AUX
HEATER HEATER
(N/C)
COMPRESSOR 1 MOTOR
PROTECTOR
95
96 (N/C)
(NC)
TK
TK
FAN THERMAL
CUT OUT
PP(T)70BHC THREE PHASE (400V 3N~ 50Hz)
19
SD566250 ISSUE 35
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