Scotsman MAR1400 - Manual (Page 7)

Complete System Installation
How it is made
The complete scale-ice making system can be
divided in three major groups, they are:
a) the condensing unit or rack system
b) the evaporator drum unit (MAR1400 or
MAR2000) complete with drive mechanism, drive
motor, refrigerant and water lines fittings,
refrigerants expansion valve and electric wire
junction box.
c) control panel and box with compressor ON/OFF
switch, relay, timer, warning lights, pressure
switches and electrical wire terminal block,
connected to and controlling the condensing unit.
CONDENSING UNIT COMPONENTS - For
Reference Only
The condensing unit is not part of the MAR1400 or
MAR2000. They must either be connected to an
existing rack system or a separate condensing
unit.
The selection of proper type and size of
compressor together with the proper type and size
of condenser, their components and controls, is
critical for proper system operation.
The available capacity of the system must equal at
least
• 4800 Kcal/h at -24EC Evap. Temp. (19,000
BTUH at -11
o
F) refrigerating capacity for the
MAR1400
• 6500 Kcal/h at –24
o
C Evap. Temp (26,000
BTUH at –11
o
F.) refrigerating capacity for
the MAR2000
Dedicated Condensing Units: Suggested
Models
MAR1400: Use MAR1400-RHS-A/C (air cooled) or
MAR1400-RHS-W/C (water cooled)
MAR2000: Use MAR2000-RHS-A/C (air cooled) or
MAR2000-RHS-W/C (water cooled)
Condensing Unit Component Guidelines
The condenser is basically a heat exchanger
where the heat absorbed by the refrigerant during
the evaporating process is discharged to the
condensing medium, which could be air or water.
Water cooled condensers require the use of a
water regulating valve. When using a marine type
condenser a marine type water regulating valve is
required. The required capacity of the condenser is
about 30,000 BTUH for the MAR1400 and 39,000
for the MAR2000.
Particular care must be deserved to the selection
of the water cooled condenser especially the
marine type for fishing vessels installation. They
must be marine type (cupro-nickel).
The Liquid receiver is a storage tank for liquid
refrigerant. It is a common component used in
refrigeration and should be large enough to hold all
the refrigerant in the system.
A suggested component for some installations an
oil separator. When the compressor operates
small amount of oil is pumped out along with the
hot compressed vapor and to prevent it from going
any further in the system, the oil separator traps it
to return, upon opening of its float valve, to the
crankcase of the compressor.
MAR1400 & MAR2000
December 2000
Page 7
Length of Tubing Run Suction Line Liquid Line
4 to 15 meters (11 to 50 feet) 18 mm ID (3/4” OD) 12 mm ID (1/2” OD)
Less than 3 meters (10 feet) 14 mm ID (5/8” OD) 14 mm ID (3/8” OD)