EMI EMI Corp manual Refrigerant Piping Installation Section, P-Trapinstallation

REFRIGERANT PIPING INSTALLATION SECTION

INTERCONNECTING TUBING

SPECIFICATIONS

Model	MAX.	Max.	Liquid	Suction
	Length	Lift	Line O.D.	Line O.D.
9900	100’	35’	1/4"	1/2"
2200	100’	35’	1/4"	1/2"
9200	100’	35’	1/4"	1/2"

The system will support refrigerant runs to the inside unit of up to 100' equivalent feet with a 35' rise included. The units are furnished with sweat connections and are equipped with refrigerant valves and Schrader fittings for charging and taking pressure readings. The following precau- tions should be made:

•Be certain no burrs remain on the fittings.

•Use only clean refrigeration tubing.

•Use tube benders to guard against kinking.

•Avoid piping on wet and rainy days and insulate suction line. Be certain that plastic end caps remain in place when inserting through wall openings. Isolate tubing from transmitting vibra- tion to the building or unit and avoid contact with sharp edges. Refrigera- tion valves should be wrapped with a wet rag "heat sink" to protect valves while brazing.

P-TRAP INSTALLATION

•A P-trap is recommended when the suc- tion riser is equal to or greater than 20 feet in height.

•When the condenser is installed above the evaporator, the P-trap will help the return of oil back to the compressor.

•The placement of the P-trap should be at the halfway mark of the suction riser. For example if the suc-

tion riser is 30 feet tall then a P-trap is recom- mended at the 15 foot mark of the suction riser (see Figure #1).

•A P-trap may be fabri-

cated using;

(2)street elbows and

(2)regular elbows. A prefabricated trap may be purchased from a Wholesaler

or Distributor however the trap should be shallow as the:

(4)elbow configuration. Each elbow is approximately 2 equivalent feet. One P-trap is equal to approximately 8 equivalent feet.

Figure #1

Multi-zone Heat Pump Condensing Units 8 www.enviromaster.com