Black Box CRDX-A-FS-24KW Split Air-Cooled Systems, Refrigerant Piping, Installation, Page

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.

OPTIONAL COMPONENTS FOR FLOODED HEAD PRESSURE CONTROL					ELECTRONIC
					THERMAL
	PRESSURE				EXPANSION
						VALVE	DISTRIBUTOR
	RELIEF VALVE			SCHRADER
CHECK VALVE	(OPTIONAL)	REFRIGERANT	SIGHT				BODY
				VALVE
		FILTER/DRIER	GLASS

HEAD PRESSURE
CONTROL VALVE	RECEIVER

ASC

ELECTRONIC

HOT GAS

REGULATOR

CHECK VALVE

	EVAPORATOR COIL
	T
SCHRADER	TEMPERATURE
VALVE	SENSOR

INTERCONNECTING	SCHRADER
	VALVE
FIELD PIPING BY OTHERS

HP

HIGH PRESSURE

LIMIT SWITCH

COMPRESSOR

	LP		PT
LOW PRESSURE		PRESSURE
LIMIT SWITCH		TRANSDUCER

REMOTE AIR COOLED CONDENSER

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.

724-746-5500 blackbox.com Page 29