Operational Checks - Scotsman ACM 85 Service Manual

Page 14
C. At completion of the water filling phase
(5 minutes) the unit passes automatically into the
freezing cycle with the start up of:
COMPRESSOR
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) on models ACM 85,
AC 125 and AC 175 and between 15 and 17
bar on model AC 225.
FIG. 2
- EVAPORATOR
- CONDENSER
- AMBIENT
Rx Tx
L
N
16
DIP
SWITCH
ELECTR.
15
TIMER
14
13
1
2 TRANSF.
In case of condenser clogging 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 62 ° C (145 ° F) - for water cooled version -
the condenser temperature sensor shuts-off
the ice maker with the consequent light-up of
the RED WARNING LIGHT (Fig.3).
After having diagnosed the reason of the rise
of temperature and removed its cause, it is
necessary to turn the head of the selector -
always using an appropriate scewdriver - first
on the RE-SET position then return it on
previous OPERATION position or unplug
(wait few seconds) and plug in again 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
FAN MOTOR
WATER PUMP