Lennox International Inc Merit Series 14ACX Units, CONDENSING UNITS New or Replacement Line Set

Figure 7. Typical Liquid Line Filter Drier Installation

BRAZE CONNECTION POINTS

LIQUID LINE

FILTER DRIER

Recommended topping−off POE oils are Mobil EAL ARCTIC 22 CC or ICI EMKARATEt RL32CF.

MATCHING WITH NEW OR EXISTING INDOOR COIL AND LINE SET

The RFC1−metering line consisted of a small bore copper line that ran from condenser to evaporator coil. Refrigerant was metered into the evaporator by utilizing temperature/pressure evaporation effects on refrigerant in the small RFC line. The length and bore of the RFC line corresponded to the size of cooling unit.

If the 14ACX is being used with either a new or existing indoor coil which is equipped with a liquid line which served as a metering device (RFCI), the liquid line must be replaced prior to the installation of the 14ACX unit. Typically a liquid line used to meter flow is 1/4" in diameter and copper.

LIQUID LINE FILTER DRIER INSTALLATION

The filter drier (one is shipped with each 14ACX unit) must be field installed in the liquid line between the outdoor unit’s liquid line service valve and the indoor coil’s metering device (fixed orifice or TXV) as illustrated in figure 7. This filter drier must be installed to ensure a clean, moisture−free system. Failure to install the filter drier will void the warranty. A replacement filter drier is available from Lennox. See Brazing Connections page 11 for special procedures on brazing filter drier connections to the liquid line.

New or Replacement Line Set

This section provides information on new installation or replacement of existing line set. If a new or replacement line set is not required, then proceed to Brazing Connections on page 11.

Field refrigerant piping consists of liquid and suction lines from the outdoor unit (braze connections) to the indoor unit coil (flare or braze connections). Use Lennox L15 (braze, non−flare) series line set, or use field−fabricated refrigerant lines as listed in table 2.

NOTE − When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351−L9, or contact Lennox Technical Support Product Applications for assistance.

To obtain the correct information from Lennox, be sure to communicate the following points:

SModel (14ACX) and size of unit (e.g. −060).

SLine set diameters for the unit being installed as listed in table 2 and total length of installation.

SNumber of elbows and if there is a rise or drop of the piping.

If refrigerant lines are routed through a wall, seal and isolate the opening so vibration is not transmitted to the building. Pay close attention to line set isolation during installation of any HVAC system. When properly isolated from building structures (walls, ceilings. floors), the refrigerant lines will not create unnecessary vibration and subsequent sounds.

IMPORTANT
Mineral oils are not compatible with HFC−410A. If oil
must be added, it must be a Polyol ester oil.
				LIQUID LINE	LINE
			SERVICE VALVE
The compressor is charged with sufficient Polyol ester oil
for line set lengths up to 50 feet. Recommend adding oil to
system based on the amount of refrigerant charge in the	OUTDOOR
system. No need to add oil in system with 20 pounds of		UNIT
refrigerant or less. For systems over 20 pounds − add one
ounce of every five pounds of refrigerant.
Table 2. Refrigerant Line Set

LIQUID

LINE

Model Number	Valve Field Size Connections			Recommended Line Set
	Liquid Line	Suction Line	Liquid Line	Suction Line	L15 Series Line Sets
14ACX−018−230
					L15−41
14ACX−024−230	3/8 in. (10 mm)	3/4 in. (19 mm)	3/8 in. (10 mm)	3/4 in. (19 mm)
					15 meters)
14ACX−030−230
14ACX−036−230
14ACX−041−230
					L15−65
14ACX−042−230	3/8 in. (10 mm)	7/8 in. (22 mm)	3/8 in. (10 mm)	7/8 in. (22 mm)
					15 meters)
14ACX−047−230
14ACX−048−230
14ACX−059−230
	3/8 in. (10 mm)	1−1/8 in. (29 mm)	3/8 in. (10 mm)	1−1/8 in. (29 mm)	Field Fabricated
14ACX−060−230
NOTE

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14ACX SERIES