Safety
Instructions
Product
Description
Installat
io
n
Electrical
Connection
Starting up &
Operation
Maintenance
& Repair
Dismantling &
Disposal
Condensing Unit For Refrigeration Networks
3.7 3 & 4 Unit Network
ø (inch)
1 Suction line
1 3/8
2 Liquid line to liquid receiver unit (LRU)
1 1/8
3 Oil distribution lines with Schraeder valves
1/4
Only for low temperature units:
4 Liquid line from receiver to heat exchanger (sub-cooler)
1 1/8
5 Liquid outlet to liquid header
5/8
Connection
Table 10:
Connection Sizes
The pipe position at the rear of the unit is identical for single compressor condensing
units.
IMPORTANT
For low temperature network systems, Copeland recommends to insulate the complete
liquid outlet line to the expansion valve in order to optimise the sub-cooling effect.
3.7.1 3 & 4 Unit Network: Master/Slave selection recommendations
As compressor-starting priority is based on balancing running hours, Copeland
recommends the compressor used in the Master unit to be bigger and/or equal in
capacity as in Slave units, in order to achieve identical capacity modulation steps.
Therefore a network could be composed of either only single compressor units or two-
compressor units.
A network could be composed also by a single compressor unit (as master, which will
start first always) and 2 or 3 two-compressor unit as slaves.
NOTE
: Configuration with a two compressor unit as master and 2 or 3 single compressor
unit as slaves is not recommended as modulation steps would not be all the time equal.
C6.1.4/0305/E
23
Part no: 3136433
