Emerson Copeland EazyCool OMQ-56-Nxx-TWD Series Application Manuallines page 23

Suction line connections
An adequately sized suction header providing equal distribution of returning refrigerant to
each condensing unit must be used. Suction type diameter at the rear of the unit is 1 3/8.
Copper connection
To
To
Condensing
Condensing
Unit
Unit
From
evaporator(s)
Liquid line
Each unit outlet liquid line should be connected to a liquid line header.
For low temperature system Copeland recommends to insulate liquid line to evaporator in
order get keep the sub-cooling effect from the heat exchanger.
Receiver equalization lines
Liquid equalization line to be connected between 2 receivers is on the middle
bottom of the unit.
Copper connection. Diameter 1 1/8.
Gas pressure equalization
Copper connection. Diameter 5/8.
Oil inlet and outlet
The oil distribution lines with Schraeder valves need to
be connected with flexible hoses
(Option proposed by Copeland).
2 unit Network back to back configuration:
Copeland recommends the 2 metres flexible
kit.
For 2 unit Network side by side configuration:
Copeland recommends 4 metres flexible kit.
Care should be taken when connecting the hoses, "oil in" of the master unit should
connected the to "oil out" of the slave unit.
Communication cable
A communication cable with M12 connectors (option proposed by Copeland) needs to be
connected between units. A 4 metres cable is recommended for 2-unit network
configuration. If connection to a monitoring system is required, an additional cable is
needed.
C6.1.4/0305/E
Condensing Unit For Refrigeration Networks
To
condensing unit
Communication cable
22
From
evaporators
To
condensing unit
Part no: 3136433