Refrigeration Installation

T h e Q u a l i t y L e a d e r i n C o n d i t i o n i n g A i r

R e s i d e n t i a l S p l i t - 6 0 H z R 4 1 0 A

R e v. : 0 3 A u g u s t , 2 0 1 2

CAUTION!

CAUTION! R-410A systems operate at higher pressures than R-22 systems. Be certain that service equipment (gauges, tools, etc.) is rated for R-410A. Some R-22 service equipment may not be acceptable.

CAUTION!

CAUTION! Installation of a factory supplied liquid line bi-directional ﬁlter drier is required. Never install a suction line ﬁlter in the liquid line.

Line Set Installation

Figures 12a through 13b illustrate typical installations with the “indoor” and “outdoor” versions of the compressor section matched to either an air handler (fan coil) or add-on furnace coil. Table 4 shows typical line-set diameters at various lengths. Lineset lengths should be kept to a minimum and should always be installed with care to avoid kinking. Line sets over 60 feet [18 meters] long are not recommended due to potential oil transport problems and excessive pressure drop. If the line set is kinked or distorted, and it cannot be formed back into its original shape, the damaged portion of the line should be replaced. A restricted line set will effect the performance of the system.

A reversible heat pump ﬁlter drier is installed on the liquid line inside the compressor section cabinet (R-22 units only). R-410A models are shipped with a ﬁlter drier (loose) inside the cabinet that must be installed in the liquid line at the line set. All brazing should be performed using nitrogen circulating at 2-3 psi [13.8-20.7 kPa] to prevent oxidation inside the tubing. All linesets should be insulated with a minimum of 1/2” [13mm] thick closed cell insulation. All insulation tubing should be sealed using a UV resistant paint or covering to prevent deterioration from sunlight.

When passing refrigerant lines through a wall, seal opening with silicon-based caulk. Avoid direct contact with water pipes, duct work, ﬂoor joists, wall studs, ﬂoors or other structural components that could transmit compressor vibration. Do not suspend refrigerant tubing from joists with rigid straps. Do not attach line set to the wall. When necessary, use hanger straps with isolation sleeves to minimize tranmission of line set vibration to the structure.

Installing the Lineset at the Compressor Section

Braze the line set to the service valve stubs as shown in Figure 10. On installations with long line sets, copper adapters may be needed to connect the larger diameter tube to the stubs. Nitrogen should be circulated through the system at 2-3 psi [13.8-20.7 kPa] to prevent oxidation contamination. Use a low silver phos-copper braze alloy on

all brazed connections. Compressor section is shipped with a factory charge. Therefore, service valves should not be opened until the line set has been leak tested, purged and evacuated. See “Charging the System.”

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HTS SERIES specifications

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