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MAR1400 & MAR2000
Multiple Installations
In a multiple installation various types of
commercial refrigerating equipment are connected
to the same condensing unit.
The MAR can be one of the refrigeration units
connected to a multiple-use condensing unit or
rack. Hand shut-off valves on both liquid and
suction line is recommended for these
installations. One to be placed on the liquid line
and the other on suction line to isolate MAR SPLIT
unit when necessary.
Suction and Liquid line access valves must be
installed in the MAR circuit to evacuate its system.
In many multiple installations check valves are put
in the suction line of the coldest evaporator to
prevent warmer higher pressure low-side vapor
from moving into the colder evaporator during the
off periods.
The MAR liquid line connection must NOT be
connected downstream of any other unit's liquid
line solenoid valve to insure that the MAR receives
refrigerant when it is required.
Installation of MAR SPLIT in multiple system
should be done in the following order.
1. Put MAR SPLIT unit in place.
See Location & Leveling.
2. Install valves and controls.
3. Install tubing.
See Refrigerant piping connections.
4. Make water piping connections.
See Plumbing.
5. Make electrical connections
See Electrical connections.
6. Check for leaks.
See Leak Test.
7. Dehydrate (evacuate) installation.
See Evacuation / Charging.
8. Start unit.
See Operational Check-out.
December 2000
Page 16
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