Scotsman MAR1400 - Manual (Page 18)

Start-Up
Condensing Unit:
Follow the manufacturer’s start up check list.
MAR1400 or MAR2000:
After system has been charged and checked-out
make sure to correctly position the ice chute.
Perform a through re-check of entire system as per
following steps.
1. Make sure to open the water supply line shut-off
valve and that water flows freely from float valve
into the drum basin.
2. Connect power to the system in order to start-up
the evaporator drive motor, the water pump and
the compressor.
Note: For the first 8 - 10 minutes after power is
connected to the MAR unit, only the water pump
and the time delay relay are powered. There will
be a red light in the upper left corner of the time
delay relay. After the time delay relay’s off time
has expired, there will be red lights in both the
upper left and the upper right corners of the front
of the relay. At that time the liquid line valve and
contactor will power up, and the unit will soon
begin to make ice.
3. Observe that evaporator drum rotates in the
right direction, namely towards the scraping blade.
WARNING - Care must be taken to ensure of
the correct rotation direction of drum.
4. Check compressor head and suction pressures.
If not within system design limits, determine why
and take corrective action.
5. For a water cooled condensing unit check the
water flowing out of the condenser to see if it
drains properly.
6. Observe if ice skin tends to cover entire drum
surface and is being scraped-off correctly by the
blade.
7. Check liquid line sight glass and expansion
valve operation. If there are indications that more
refrigerant is required leak test all connections
before adding refrigerant.
8. Observe oil level in compressor crankcase sight
glass and add oil as necessary to bring level to
center of the sight glass.
9. Let the system operate for at least two hours,
then check one by one the operation of each
individual control and protective device for proper
setting.
10. Eliminate any excessive vibration or noise and
pulleys misalignment.
11. Observe that evaporator drum is frosted all
over from end to end. If this is not the case setting
of refrigerant expansion valve may be necessary.
For proper adjustment of this valve turn the valve
adjustment stem of one eight of a turn
counter-clockwise to allow more refrigerant to flow
until the evaporator drum surface is evenly frosted
from end to end.
In case there is an excessive frost back on the
suction line and frost start to form on compressor
suction service valve, slightly turn clockwise the
expansion valve setting stem until the frost back
on the compressor service valve melts over.
Indicative Operating Pressure - With Fresh
Water Supply - Water Cooled System
• Head Pressure (bar) 17 (245 PSIG)
• Suction at EPR valve: 1.6 (22 - 23 PSIG)
• MAR1400 Drum R.P.M. (thick ice) 1.5
• MAR2000 Drum R.P.M. 2.4
12. In relation to the desired quality of scale ice,
review the position of float reservoir to see if water
in drum reservoir is at the corresponding level.
The correct water level is:
• 115-120 mm
• 4.5” to 4.75”
13. Observe that ice slides through spout opening
with no difficulties. Clearance between the blade
and drum surface must be 0,10 m/m (.004”).
Transparent plastic chute must be flat.
14. When the system is performing satisfactorily
go over with the owner/user to all significant
specifications, the start-up and operations. Answer
all questions about the care and attention to give
to the ice making system.
MAR1400 & MAR2000
December 2000
Page 18