Operational Checks - Scotsman AC 106 Service Manual

Page 17
C. At completion of the water filling phase
(5 minutes) the unit passes automatically into the
freezing cycle with the start up of:
COMPRESSOR
CONTACTOR COIL (Not on AC 106)
WATER PUMP
FAN MOTOR (in air cooled version) controlled by
the condensing temperature sensor located within
the condenser fins (Fig.2).

OPERATIONAL CHECKS

D. Install, if required, the refrigerant service
gauges on both the high side and low side
Scraeder valves to check the compressor head
and suction pressures.
NOTE. On air cooled models, the condenser
temperature sensor, which is located within
the condenser fins, keep the head
(condensing) pressure between 8.5 and 9.5
bar (110 ÷ 130 psig) - 15-17 bar (220-245 psi)
on AC 206 and AC 226.
FIG. 2
- EVAPORATOR
- CONDENSER
- AMBIENT
Rx Tx
L
N
16
DIP
SWITCH
ELECTR.
15
TIMER
14
13
1
2 TRANSF.
In case of air condenser filter clogged such to
prevent the proper flow of the cooling air or,
in case the fan motor is out of operation or
shortage of water in the water cooled
condenser, the condenser temperature rises
and when it reaches 70 ° C (160 ° F) - for air
cooled version - or 60 ° C (140 ° F) - for water
cooled version - the condenser temperature
sensor shuts-off the ice maker with the
consequent light-up of the RED WARNING
LED (Fig.3) as well as the Red Alarm Light
(ON Steady).
After having diagnosed the reason of the rise
of temperature and removed its cause, it is
necessary to Switch OFF (wait few seconds)
and Switch ON the unit, thus to put the
machine in condition to initiate a new freezing
cycle.
The machine restarts with the usual 5 minutes
water filling phase in order to provide enough
water into the sump tank.
WATER DRAIN VALVE
WATER IN VALVE
7
8
HOT GAS VALVE
9
10
CONTACTOR COIL
RELAYS
3
4
5
TRIAC
6
RELAY
11
12
ELECTRONIC CARD
Page 17
FAN MOTOR
WATER PUMP