Mar Split In Multiple Installation; Typical Non-Code Commercial Installation - Scotsman MAR 78 Service Manual

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MAR SPLIT IN MULTIPLE INSTALLATION

In multiple installation various types of commercial
refrigerating equipment are connected to the
same condensing unit, which is normally located
in the machine room, as often occurs in
supermarkets.
MAR SPLIT can be one of the refrigerant units
connected to a multiple use condensing unit.
In this kind of installation it will be best to replace
the standard AEV refrigerant control with a
corresponding size AMXV control, which, in
relation to the multiple installation situations (great
evaporating temperature difference) could be of
two temperature type.
Also a manifold with hand shut-off valves on
both liquid and suction line is recommended for
these installations.
In many multiple installations check valves are
put in the suction line of the coldest evaporator to
prevent that warmer higher pressure low-side
vapor moves into colder evaporator during the off
periods.
Also a pressure control valve is installed on
MAR SPLIT ICE MAKER
Installation of MAR SPLIT in multiple system
should be done in the following order.
1. Put MAR SPLIT unit in place.
See Sec. II Location & Levelling.
2. Install valves and controls.
3. Install tubings.
See Sec. II Refrigerant piping connections.
4. Make water piping connections.
See Sec. II Plumbing.
MAR SPLIT suction line to maintain constant
pressure on evaporator drum.
Therefore, for the MAR SPLIT multiple installation
you may need:
1. Automatic Expansion valve
The automatic expansion valve is the leading
multiple evaporator system refrigerant control
as it does not regulate the low side pressure,
but, rather control the filling of the evaporator
with refrigerant, it is important to use a valve
for the correct capacity.
2. Solenoid valve
Two-ways type to be connected in series with
any MAR SPLIT protecting and starting device.
3. Pressure Control valve
On the MAR SPLIT suction line. It will mantain
constant pressure on MAR SPLIT evaporator
drum.
4. Manifold with hand shut-off valve
One to be placed on the liquid line and the
other on suction line to isolate MAR SPLIT
unit when necessary.

TYPICAL NON-CODE COMMERCIAL INSTALLATION

1. Power line
2. Main switch
3. Relay / Starter
DISPLAY CASE
5. Make electrical connections
See Sec. II Electrical connections.
6. Check for leaks.
See Sec. II Leak Test.
7. Dehydrate installation.
See Sec. III Evacuation / Charging.
8. Start unit.
See Sec. III Operazional Check-out.
4. Suction line shutoff valves
5. Liquid line shutoff valves
MEET ROOM
CONDENSING UNIT
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