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724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 29
Chapter 2: Installation
2.8 Split Air-Cooled Systems
Split air-cooled systems with a remote condenser will require field-installed refrigerant piping. All split systems are shipped with a
dry nitrogen charge of 100 psig. Release the pressure via an available stem valve or Schrader valve prior to uncapping the pipes.
Do not release the pressure until the field-installed refrigerant piping is ready to connect. Systems using a remote condenser will
require a copper liquid line and discharge line. See Figure 2-10 and refer to the IOM documentation provided with the condenser.
SIGHT
REFRIGERANT
FILTER/DRIER
REMOTE AIR COOLED CONDENSER
COMPRESSOR
HP
LIMIT SWITCH
HIGH PRESSURE
VALVE
SCHRADER
LP
VALVE
SCHRADER
LIMIT SWITCH
LOW PRESSURE
DISTRIBUTOR
THERMAL
EXPANSION
VALVE
RECEIVER
RELIEF VALVE
PRESSURE
CONTROL VALVE
HEAD PRESSURE
CHECK VALVE
CHECK VALVE
EVAPORATOR COIL
FIELD PIPING BY OTHERS
INTERCONNECTING
SCHRADER
VALVE
BODY
GLASS
OPTIONAL COMPONENTS FOR FLOODED HEAD PRESSURE CONTROL
ELECTRONIC
TEMPERATURE
SENSOR
T
PT
PRESSURE
TRANSDUCER
(OPTIONAL)
HOT GAS
REGULATOR
ASC
ELECTRONIC
Figure 2-10. Typical remote air-cooled DX piping diagram.
2.8.1 Refrigerant Piping
Refrigerant lines for the A/C unit are routed to either the top or bottom of the cabinet as specified when the Cold Row system is
ordered (see Section 2.8.1.1). The connections are made inside the cabinet. The pipe stubs are labeled; i.e. “Discharge,” “Liquid
Line.”
The refrigerant piping should be isolated by using vibration-isolating supports. Provide supports (clamps or hangers) as necessary
every 5 to 10 feet along piping runs to minimize vibration and noise transmission. To reduce vibration transmission and prevent
pipe damage when sealing openings in walls, use a soft flexible material to pack around the piping. After the piping is installed,
seal the gaps between the pipes and the entrance holes in the cabinet so air won’t leak around the pipes.
All refrigeration piping should be installed with high-temperature brazed joints. Use standard refrigeration practices for piping,
leak testing, dehydration, and charging of the refrigeration circuits. For copper-to-copper brazing, phosphorous alloy containing a
minimum of 15% silver is recommended. General-purpose silver brazing alloy with 45% silver is recommended for brazing
dissimilar metals.